Doc #121 — Dental Care Under Isolation

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RECOMMENDED ACTIONS (BY ACTUAL URGENCY)

First month:

1. Include dental material stocks in the national asset census (Doc #8) — establish actual quantities of filling materials, anaesthetic cartridges, burs, impression materials, and other consumables (without which restorative dentistry ceases) held by dental practices, hospital dental departments, and distributors
2. Issue guidance to all dental practices: conserve all materials, defer elective cosmetic procedures, prioritise emergency and pain-relief treatment
3. Secure dental supply distributor warehouses (Henry Schein Halas is the dominant NZ dental distributor) under Category B controlled distribution (Doc #1)²

First three months:

4. Establish a national dental material rationing and allocation system — centralised through Te Whatu Ora / Health NZ dental services
5. Issue clinical protocols: when to restore vs. when to extract, given finite material supply
6. Begin stocktaking of clove oil (eugenol) held by dental practices, pharmacies, and herbal suppliers
7. Identify and secure zinc oxide powder stocks (industrial, pharmaceutical, and dental grade)

First year:

8. Establish pilot production of zinc oxide-eugenol (ZOE) cement for temporary restorations
9. Begin clove oil distillation trials from imported dried cloves held in NZ food supply stocks, or from any NZ-grown Syzygium aromaticum (unlikely to be significant — see Section 6.3)
10. Transition dental workforce: retrain for expanded extraction capability, temporary restorations, preventive care emphasis
11. Develop and distribute dental emergency management training for non-dental healthcare providers in remote communities
12. Ensure water fluoridation systems are maintained where they exist (Doc #48 — grid power required for treatment plants)³

Ongoing (Phase 2–4):

13. Expand community oral health education — toothbrushing technique, dietary sugar reduction, early identification of dental problems
14. Investigate local production pathways for dental hand instruments (Doc #91, Doc #92)
15. Develop extraction anaesthesia alternatives and protocols for situations without local anaesthetic supply

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ECONOMIC JUSTIFICATION

3.1 The cost of dental neglect

Dental disease is not lethal in most cases — but it is not trivial. Untreated dental caries progresses to pulpitis (pain), then periapical abscess (infection), then potentially cellulitis, Ludwig’s angina (floor-of-mouth infection), or sepsis. Before antibiotics, dental infections were a significant cause of death.⁴ Even with antibiotics available (Doc #116, though supply is finite), each dental infection that progresses to the point of requiring systemic antibiotics consumes precious pharmaceutical resources that could be avoided with timely dental intervention.

3.2 Person-years and trade-offs

NZ’s dental workforce of ~2,500 dentists and ~2,800 therapists/hygienists represents a substantial existing human capital investment.⁵ The question is not whether to maintain dental care — the workforce already exists and cannot be meaningfully redeployed to other medical roles without years of retraining — but how to direct that workforce most effectively as materials deplete.

Preventive care is the highest-return investment. A dental hygienist spending one hour teaching a community of 50 people proper brushing and dietary advice prevents more disease over 10 years than the same hour spent attempting a filling with improvised materials. The economic case for shifting the dental workforce toward prevention — even more strongly than in peacetime — is well-supported by pre-crisis public health evidence and becomes stronger as restorative materials deplete.

Extraction capability has high value relative to cost. Maintaining extraction capability requires durable instruments (forceps, elevators — already held by every dental practice), adequate lighting (grid power assumed available, Doc #46), infection control (ethanol-based antisepsis, Doc #51), and some form of pain management (local anaesthetic while it lasts; alternatives thereafter). The cost is low; the value — preventing deaths from dental sepsis and alleviating severe pain — is high.

3.3 Material investment for local cement production

Establishing zinc oxide-eugenol cement production at a scale sufficient for NZ’s basic restorative needs requires:

• Zinc oxide powder: available from NZ industrial sources (used in paints, rubber, agriculture). NZ does not mine zinc, but industrial stocks of zinc oxide are likely present in significant quantities — to be established by census (Doc #8)⁶
• Eugenol (clove oil): NZ holds some stock in dental supply chains, pharmacies, and food industry (clove oil is used in food flavouring). Local distillation from dried clove stocks is feasible at small scale. Long-term supply depends on trade with clove-producing regions (Indonesia, Madagascar — potentially accessible via Pacific sail routes, Doc #87, Doc #138)
• Mixing and packaging: minimal equipment — glass slabs, spatulas, and small containers. Any dental practice can produce ZOE cement from raw materials with basic training

The total labour investment for establishing pilot ZOE production is modest — perhaps 2–5 person-months of development and testing. This is one of the lower-cost interventions in the Recovery Library.

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4. NZ’S DENTAL WORKFORCE AND INFRASTRUCTURE

4.1 Workforce

NZ’s dental workforce comprises approximately:⁷

• ~2,500 practising dentists — registered with the Dental Council of New Zealand, working across private practice, hospital dental services, and community oral health services
• ~600 dental therapists — registered practitioners who provide basic restorative and preventive care, primarily to children and adolescents through the School Dental Service
• ~800 dental hygienists — registered practitioners providing preventive care, periodontal treatment, and oral health education
• ~1,400 dental technicians and clinical dental technicians — fabricate and fit prostheses (dentures, crowns, bridges)
• ~2,500 dental assistants — support clinical care

Geographic distribution: Dental practitioners are concentrated in urban centres, particularly Auckland, Wellington, and Christchurch. Rural and remote communities have limited dental access even in peacetime — a problem that worsens under isolation as visiting practitioners may no longer travel and fuel for patient transport is rationed.⁸

Maori and Pacific oral health: Maori and Pacific populations have significantly higher rates of dental caries and tooth loss than NZ European populations, particularly among children.⁹ These populations enter the crisis with a higher burden of existing dental disease and less capacity to absorb further decline. Community-level preventive programmes should prioritise high-need populations.

4.2 Infrastructure

Dental practices: NZ has approximately 1,800–2,000 dental practices.¹⁰ Each contains:

• Dental chair with integrated lighting (electric-powered)
• Compressed air system (for handpieces and air-water syringe)
• Handpieces (high-speed and low-speed drills) — functional while burs last and compressed air/electricity available
• Suction system (electric)
• Sterilisation equipment (autoclave — electric)
• Hand instruments (mirrors, probes, explorers, excavators, scalers, forceps, elevators) — these are durable steel instruments that last decades with maintenance
• Radiography (dental X-ray units — functional while film or digital sensors work and electricity is available)

Hospital dental departments: Major hospitals have oral and maxillofacial surgery capability, including operating theatre access for complex procedures under general anaesthesia (Doc #118 for anaesthetic supply constraints).

School Dental Service: NZ’s community oral health service operates dental clinics in schools across the country, staffed by dental therapists. This infrastructure is valuable for preventive care delivery and should be maintained.¹¹

4.3 What degrades and when

The dental infrastructure degrades at different rates:

Component	Depletion timeline	Substitute available?
Composite filling material	6–18 months at rationed use	No direct substitute. ZOE cement is temporary only
Amalgam filling material	6–18 months at rationed use	No direct substitute at equivalent durability
Local anaesthetic cartridges	6–18 months at rationed use	No local production pathway in near term
Dental burs (drill bits)	1–3 years (tungsten carbide burs last longer than diamond)	Not locally producible without precision manufacturing
Impression materials (alginate, silicone)	6–12 months	Limited — plaster of Paris impressions possible but inferior
Dental X-ray film / digital sensors	1–5 years (film depletes; digital sensors last longer if electronics function)	No local production of film
Endodontic files	1–3 years	Not locally producible
Orthodontic wire and brackets	6–18 months (but orthodontic treatment is elective and should cease)	Not locally producible
Dental handpieces (drills)	5–15 years (durable, but require maintenance parts)	Bearings and turbine cartridges not locally producible
Hand instruments (forceps, elevators, scalers)	20–50+ years with maintenance	Can be fabricated by skilled metalworkers (Doc #91, Doc #92)
Autoclave	10–20+ years (seals and heating elements may need replacement)	Pressure cooker sterilisation as backup (Doc #117)
Dental chair and light	15–30 years (mechanical, with electrical components)	Adequate lighting from any electric source; patient positioning improvised

Key observation: The durable instruments that enable the two most important dental functions — extraction and examination — last decades. What depletes quickly are the consumable materials that enable restorative dentistry (fillings, crowns, root canals). The dental workforce transitions from restorative practitioners to primarily diagnostic, preventive, and surgical (extraction) practitioners as consumables deplete.

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5. CONSUMABLE DEPLETION AND RATIONING

5.1 Current NZ dental supply chain

NZ’s dental materials supply chain runs through a small number of distributors, dominated by Henry Schein Halas (a subsidiary of the US-based Henry Schein Inc.).¹² Other distributors include SDI and various smaller importers. All dental materials — filling composites, cements, bonding agents, impression materials, anaesthetic cartridges, burs, endodontic supplies — are imported.

In-country stock estimate: At any given time, NZ’s dental supply chain likely holds 2–6 months of normal consumption across most product categories, based on standard distribution chain inventory practices. This estimate is uncertain and must be verified through census.¹³

5.2 Rationing framework

Dental material rationing follows the same principles as pharmaceutical rationing (Doc #116) — allocate finite resources to highest-value clinical uses.

Priority 1 — Emergency and pain relief:

• Extraction of non-restorable teeth causing acute pain or infection
• Incision and drainage of dental abscesses
• Temporary restorations to relieve pain (using ZOE cement or glass ionomer cement while available)
• Trauma management (stabilisation of fractured or avulsed teeth)
• Local anaesthetic use for these procedures

Priority 2 — Essential restorative:

• Restoration of teeth in children and young adults where long-term benefit is greatest
• Restoration of anterior teeth where function (eating, speaking) is significantly affected
• Management of teeth with large carious lesions that will become emergencies without intervention

Priority 3 — Standard restorative:

• Routine fillings in adult teeth where the lesion is progressing but not yet causing symptoms
• Prosthetic replacement (dentures) for patients with significant functional impairment

Priority 4 — Elective (suspended):

• Cosmetic dentistry (veneers, whitening, elective crowns)
• Orthodontic treatment
• Elective prosthetics for minor tooth loss
• Any procedure that consumes material for primarily aesthetic benefit

5.3 The local anaesthetic problem

Local anaesthetic is arguably the single most impactful dental consumable, because without it, restorative procedures and many extractions become extremely painful and some become infeasible. NZ dental practices use lidocaine (lignocaine) with adrenaline (epinephrine) as the standard dental local anaesthetic, supplied as pre-loaded cartridges.

Stock estimate: NZ’s dental supply chain probably holds several hundred thousand anaesthetic cartridges at any given time — perhaps 3–12 months of normal consumption.¹⁴ Under strict rationing (reserved for extractions and essential procedures), this supply could be extended to 1–3 years.

When anaesthetic runs out: Extractions become much more difficult for the patient but remain feasible — teeth were extracted for centuries without local anaesthesia. Dental abscesses often have reduced sensation in the affected area due to nerve compression from the infection. Non-emergency procedures that require anaesthesia (fillings, root canals) become largely impractical.

Possible extensions:

• Lidocaine is used in medical settings as well (Doc #118, Doc #116). Dental and medical anaesthetic supplies should be managed under a single allocation system, not separately
• Lidocaine hydrochloride powder, if available from pharmaceutical raw material stocks, can theoretically be formulated into injectable solution by hospital pharmacies — but this requires sterile compounding capability and is not straightforward¹⁵
• Topical anaesthetics (benzocaine, lidocaine gel) provide surface numbness sufficient for minor procedures and can extend the period of some dental capability
• Nitrous oxide (if cylinders are available from medical or industrial supply) provides analgesia and anxiolysis but not true anaesthesia
• Cold application (ice) provides brief, partial numbness for very minor procedures
• General anaesthesia (Doc #118) for hospital-based dental extractions in extreme cases — but this consumes general anaesthetic agents, which are also finite

Honest assessment: When dental anaesthetic cartridges are exhausted and no substitute is available, dental care reverts to a pre-anaesthesia model. Extractions are performed with physical restraint and speed rather than comfort. Restorative dentistry effectively ceases. This is a significant regression in the standard of care and there is no near-term local production pathway for dental local anaesthetic.

5.4 Filling materials: depletion and alternatives

Composite resin: The dominant filling material in NZ dentistry. A mixture of resin matrix (BIS-GMA or similar), inorganic filler particles (silica, glass), coupling agents, and photoinitiators. Requires UV curing light. Cannot be produced locally — the chemistry is complex industrial polymer science. When composite is exhausted, it is gone.

Dental amalgam: A mixture of mercury with a silver-tin-copper alloy powder. NZ has largely phased out amalgam in favour of composite, but some stock remains. Amalgam is more durable than composite in high-stress areas. Mercury is the constraining ingredient — NZ does not produce mercury, and global stocks within NZ are limited (some in dental supply chains, some in industrial/scientific supply). Amalgam’s long working history means it can be placed with minimal equipment — no curing light needed.¹⁶

Glass ionomer cement (GIC): A cement that bonds chemically to tooth structure and releases fluoride. Available in NZ dental supply chains. Cannot be produced locally. Less durable than composite or amalgam but adequate for many restorations. Should be prioritised for paediatric use because of its fluoride-releasing properties.

Zinc oxide-eugenol (ZOE) cement: The most realistic locally producible dental restorative material. ZOE is a temporary cement — it is not durable enough for permanent restorations but can seal cavities for months to years in low-stress areas. It has analgesic properties (eugenol is a mild anaesthetic and anti-inflammatory). ZOE has been used in dentistry for over 150 years.¹⁷

Zinc phosphate cement: Another historical dental cement, made from zinc oxide powder mixed with phosphoric acid. More durable than ZOE. Phosphoric acid availability in NZ is uncertain — it is used in industrial applications and fertiliser production (Doc #80) and may be present in industrial chemical stocks. If phosphoric acid is available, zinc phosphate cement is producible locally.¹⁸

The honest assessment of filling material substitution: ZOE and zinc phosphate cements are vastly inferior to composite and amalgam for permanent restorations. They wear faster, fracture more easily, do not tolerate high biting forces, and provide temporary rather than permanent seals. Using them means that “restorations” are really temporary patches that need replacement every 6–24 months rather than lasting 5–15 years. Teeth restored with temporary cements will eventually fail and require extraction. The substitution delays tooth loss; it does not prevent it.

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6. LOCALLY PRODUCIBLE DENTAL MATERIALS

6.1 Zinc oxide-eugenol (ZOE) cement

What it is: A two-component cement made by mixing zinc oxide powder with eugenol (the active chemical in clove oil). When mixed, they form a hard-setting material that adheres to tooth structure and has mild analgesic properties.

Zinc oxide: A white powder (ZnO) used in many industrial applications — paints, rubber manufacture, agriculture (animal feed supplement), sunscreen, and pharmaceutical preparations (calamine lotion). NZ does not mine zinc, but zinc oxide is imported in bulk for industrial use and is likely present in NZ in significant quantities.¹⁹ The national asset census (Doc #8) should establish how much zinc oxide is available. Industrial-grade zinc oxide may require purification for dental use — pharmaceutical-grade (BP/USP) zinc oxide is preferable and is held by pharmaceutical suppliers and some dental distributors.

Eugenol: The primary chemical component of clove oil, comprising 70–90% of oil of cloves.²⁰ Eugenol has analgesic, anti-inflammatory, and antibacterial properties. It has been used in dentistry for centuries.

Sources of eugenol in NZ:

• Dental supply stocks: Dental practices and distributors hold eugenol and clove oil as dental materials. Quantity: probably modest — months of normal use at most
• Pharmaceutical stocks: Clove oil (BP grade) held by pharmacies and pharmaceutical suppliers
• Food industry stocks: Clove oil is used as a food flavouring. NZ food manufacturers and spice importers hold some stock of clove oil and whole/ground cloves
• Dried cloves: NZ imports dried cloves as a spice. The in-country stock of dried cloves (in warehouses, supermarkets, and domestic pantries) can be steam-distilled to extract clove oil. Yield is approximately 15–20% oil by weight from dried clove buds²¹
• Long-term trade: Cloves (Syzygium aromaticum) grow in tropical regions — Indonesia, Madagascar, Tanzania. If Pacific sail trade develops (Doc #87, Doc #152), cloves and clove oil could be imported. Indonesia is NZ’s most accessible source via Pacific trade routes

Production process for ZOE cement:

1. Obtain pharmaceutical-grade zinc oxide powder (or purify industrial-grade by washing and drying)
2. Obtain eugenol — either from dental/pharmaceutical supply or by steam distillation of dried cloves
3. Mix on a glass slab: gradually incorporate zinc oxide powder into eugenol using a spatula until the desired consistency is reached (a thick paste for temporary fillings, thinner for cementation)
4. Place into the prepared cavity and allow to set (setting time: 3–10 minutes depending on powder-to-liquid ratio and temperature)

The mixing and placement technique (steps 3–4) requires no specialised equipment beyond a glass slab and spatula, and can be taught to any dental practitioner in a single training session. Obtaining the raw materials (steps 1–2) is the bottleneck — purifying industrial-grade zinc oxide requires washing, filtration, and drying facilities, and steam distillation of clove oil requires a fabricated still (see footnote 15).

6.2 Clove oil for pain management

Eugenol has been used as a dental analgesic for centuries and remains effective.²² Applications:

• Direct application to exposed pulp or cavity: A cotton pellet soaked in clove oil placed into a painful cavity provides temporary relief lasting hours. This is a well-established emergency dental technique
• As a component of ZOE sedative dressings: ZOE cement placed over an inflamed tooth provides sustained release of eugenol with analgesic effect
• Dry socket (alveolar osteitis) management: Clove oil on a gauze pack placed into a dry socket after extraction is the traditional treatment and remains effective

Kawakawa (Macropiper excelsum) as supplementary oral analgesic: Kawakawa leaves contain myristicin and other bioactive compounds with mild analgesic and anti-inflammatory properties, and have traditional Maori use for toothache and oral pain.²³ Kawakawa grows throughout the North Island and northern South Island and is readily available without import dependency. Preparations (chewed leaf, poultice applied to the gum) provide modest pain relief — less potent than eugenol but useful as a supplement when clove oil stocks are limited. The two can be used in combination: clove oil for direct cavity application, kawakawa for surrounding tissue inflammation.

Limitations of topical analgesics: Eugenol and kawakawa are mild analgesics, not local anaesthetics. They cannot substitute for lidocaine injection for procedures. They manage background pain, not procedural pain. Eugenol can also cause chemical burns to soft tissue if applied carelessly in concentrated form.

6.3 Can NZ grow cloves?

Cloves require a tropical climate (20–30°C, high humidity, no frost) and take 6–8 years from planting to first harvest.²⁴ NZ’s climate is unsuitable for clove cultivation anywhere in the country — even Northland is too cool and seasonal. Local clove production is not a viable pathway.

6.4 Other locally producible materials

Salt water rinse: Warm saline (1 teaspoon salt in 250 mL warm water) is an effective oral rinse for post-extraction care, minor infections, and general oral hygiene. Salt is abundantly available in NZ (sea salt production requires only seawater, evaporation pans or boiling vessels, and labour — Doc #1). This is the most universally available dental material.

Hydrogen peroxide rinse: Dilute hydrogen peroxide (1–3%) is an effective oral antiseptic. Hydrogen peroxide is held in pharmaceutical and industrial stocks. Longer-term local production depends on chemical industry development.²⁵

Wax and resin temporary restorations: Beeswax, pine resin, and combinations thereof have historical use as temporary tooth fillings. These are extremely temporary (days to weeks) and serve only as an emergency measure to cover an exposed cavity between visits. Both materials are available in NZ — beeswax from NZ apiaries, pine resin from NZ plantation forests.²⁶

Charcoal powder for tooth cleaning: Activated charcoal has mild abrasive properties and has been used as a dentifrice historically. NZ can produce charcoal (Doc #102). Its effectiveness is inferior to fluoride toothpaste, and there is some evidence of enamel abrasion with heavy use, but it is better than no cleaning at all.²⁷

Baking soda (sodium bicarbonate): An effective tooth-cleaning agent and mild antiseptic. Available in NZ household stocks and producible from soda ash. Widely used as a dentifrice historically and in some modern formulations.²⁸

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7. CLINICAL PRACTICE UNDER DEPLETION

7.1 The extraction decision

As filling materials deplete, the threshold for extraction shifts. In modern dentistry, the default approach is to save the tooth with a filling, crown, or root canal. Under depletion, the calculus changes:

Extract rather than restore when:

• The tooth is non-restorable with available materials (large carious lesion, structural compromise)
• Restoration would consume scarce materials on a tooth with a poor long-term prognosis
• The tooth is already symptomatic with pulpitis or periapical infection and root canal treatment is not feasible (no endodontic files, no reliable root canal filling materials, no anaesthetic)
• The patient is unlikely to access follow-up care for a temporary restoration that will need replacement

Restore (temporarily) when:

• The lesion is small enough to manage with ZOE or available cement
• The tooth is functionally important (anterior teeth for appearance and speech, molar teeth for chewing)
• The patient is young and preserving the tooth maintains arch integrity and development
• Materials are available and the restoration has a reasonable chance of lasting 6–12+ months

This is a significant cultural and professional shift. Modern dental training emphasises tooth preservation. Dentists will need explicit guidance and institutional support to transition to a more extraction-oriented practice without feeling they are providing substandard care. They are not — they are providing appropriate care under changed circumstances.

7.2 Extraction technique with limited resources

Dental extraction requires:²⁹

• Forceps: Various patterns for different teeth. Durable stainless steel instruments that last decades. Every dental practice holds a set
• Elevators: Used to loosen teeth before forceps application. Similarly durable
• Adequate lighting: Electric light (grid power assumed available)
• Infection control: Ethanol-based hand and instrument disinfection (Doc #51). Autoclaved instruments preferred. Boiled instruments acceptable if autoclave is unavailable
• Haemostasis: Gauze pressure (gauze from Doc #117 local production). Sutures if socket bleeding is significant (catgut sutures from Doc #117)
• Post-operative care: Saline rinse. Written instructions. Analgesics (paracetamol, ibuprofen from Doc #118 — extended shelf life)
• Local anaesthetic: Preferred but not essential. See Section 5.3 for the situation when anaesthetic supply is exhausted

Skills requirement: Every dentist and dental therapist in NZ is trained in extraction technique. The skill set is already present in the workforce. Some upskilling may be needed for surgical extractions (impacted teeth, fractured roots) that are currently referred to specialist oral surgeons — under isolation, general practitioners will need to manage a wider range of extractions.

7.3 Infection management

Dental infections that progress beyond local abscess — cellulitis, fascial space infections, Ludwig’s angina — are medical emergencies that can be fatal.³⁰ Management:

• Incision and drainage: Surgical drainage of dental abscesses is performed with a scalpel blade (durable, or fabricated locally — Doc #117) and requires minimal consumables
• Antibiotics: Amoxicillin is the first-line antibiotic for dental infections in NZ. Supply is managed under Doc #116. Dental infections should be included in the antibiotic triage framework — a spreading dental infection is a legitimate use of scarce antibiotics
• Source control: Extraction of the causative tooth is the definitive treatment. An abscess drained without removal of the infected tooth will recur. Extraction under active infection is more difficult but usually necessary
• Pain management: Paracetamol and ibuprofen (Doc #116). Clove oil for local analgesic effect. Kawakawa preparations as supplement (Section 6.2). Opioids reserved for severe cases (Doc #116 rationing framework)
• Locally available antimicrobials for post-extraction and infection care: Manuka honey (Leptospermum scoparium) has well-documented antibacterial properties, including activity against oral bacteria such as Streptococcus mutans, primarily due to methylglyoxal (MGO).³¹ Applied topically to extraction sockets or infected oral tissue, it provides antimicrobial wound care as antibiotic stocks deplete. Koromiko (Veronica stricta, formerly Hebe stricta) contains aucubin and other compounds with anti-inflammatory and antimicrobial activity, and has traditional Maori use for mouth infections and sore throats; preparations can serve as antimicrobial oral rinses.³² Both are NZ-produced and available without import dependency. These traditional remedies should be used alongside evidence-based dental care — their value is in antimicrobial support and pain management where modern supply is depleting

7.4 Preventive care — the highest-value intervention

Under depletion, prevention becomes the dominant dental strategy. Every cavity prevented is one that does not need a filling or an extraction. Every tooth kept healthy is one that remains functional.

Water fluoridation: Approximately 52% of NZ’s population receives fluoridated water.³³ Community water fluoridation is the single most effective population-level dental caries prevention measure.³⁴ Maintaining fluoridation where it exists requires grid power for water treatment plants (baseline assumption — grid continues, Doc #48) and fluoride chemical supply (sodium fluorosilicate or hydrofluorosilicic acid, both imported). NZ’s in-country fluoride chemical stock will deplete over years — the timeline depends on quantities held, which the census should establish. When fluoride chemicals are exhausted, caries rates will increase, particularly in children.

Toothbrushing: Toothbrushes are imported. NZ does not manufacture toothbrushes. The in-country stock of toothbrushes (in retail stores, warehouses, and domestic stocks) is finite. Toothbrush alternatives include:³⁵

• Cloth wrapped around a finger — less effective than a brush but provides mechanical cleaning
• Small sticks chewed to splay the fibres (miswak/chewing sticks) — used in many cultures and shown to be moderately effective. NZ native species such as manuka (Leptospermum scoparium) have antimicrobial properties and may be suitable
• Fabricated brushes using NZ materials — bristles from pig hair (from NZ meat processing plants) or horsehair, set into wooden handles with drilled holes. Pre-nylon toothbrushes used animal bristle. Requires bristle collection, cutting to length, handle shaping, and binding or gluing bristles into the head — within the capability of any woodworking workshop

Toothpaste: Imported. NZ does not manufacture toothpaste. Substitutes include baking soda (sodium bicarbonate), salt, and charcoal powder. None provide fluoride protection. The performance gap is real — fluoride toothpaste prevents caries in a way that non-fluoride alternatives do not.

Dietary advice: Sugar is the primary dietary driver of dental caries. Under post-event conditions, refined sugar consumption will decline dramatically (NZ does not grow sugarcane or sugar beet commercially, and imported sugar stocks will deplete). This is paradoxically good for dental health — reduced sugar consumption reduces caries rates. However, if alternative sweeteners or high-carbohydrate foods (potatoes, bread) become dietary staples, some caries risk remains.³⁶ Community education should emphasise:

• Limiting frequency of eating (snacking between meals increases caries risk more than total sugar quantity)
• Rinsing with water after eating
• Maintaining toothbrushing or mechanical cleaning twice daily
• Recognising early signs of dental disease (pain, sensitivity, visible cavities, swollen gums)

7.5 Dentures and prosthetics

Current NZ situation: Approximately 1,400 dental technicians and clinical dental technicians fabricate prostheses in NZ.³⁷ Modern denture fabrication requires acrylic resin (polymethyl methacrylate — PMMA), denture teeth (acrylic or porcelain), impression materials, articulators, and other specialised equipment.

Depletion: Acrylic resin is imported and cannot be produced locally. When acrylic stocks are exhausted, conventional denture fabrication ceases.

Historical alternatives: Before acrylic (introduced in the 1940s), dentures were made from:³⁸

• Vulcanite (vulcanised rubber): The standard denture base material from the 1850s to 1940s. Requires natural rubber (NZ has no rubber supply — see Doc #33) and sulphur. Not feasible locally
• Porcelain: Requires kaolin clay, feldspar, and high-temperature kilns. NZ has kaolin deposits. Porcelain dentures are feasible in principle but require significant craft skill and kiln infrastructure (Doc #98 for ceramics)
• Wood: Historically used in Japan and elsewhere. Extremely crude by modern standards. Feasible as a last resort
• Bone/ivory carved dentures: Historical precedent but impractical at scale

Honest assessment: When acrylic is exhausted, the ability to provide comfortable, functional dentures drops dramatically. Partial dentures using cast metal frameworks (if metal is available and casting capability exists — Doc #93) may extend some prosthetic capability. But the standard of denture provision that NZ’s elderly population currently receives will not be maintained. Patients who lose teeth during the crisis and cannot receive dentures will have permanent functional impairment in eating and speaking. This is one of the many quality-of-life declines that this document must acknowledge.

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8. WORKFORCE ADAPTATION AND TRAINING

8.1 Reorienting the dental workforce

The dental workforce must shift from a restorative-dominant model to a prevention-and-extraction-dominant model. This requires:

Clinical retraining:

• Expanded extraction skills for general dental practitioners — managing impacted teeth, surgical extractions, and post-extraction complications that would currently be referred to specialists
• ZOE and zinc phosphate cement preparation and placement techniques
• Diagnosis and management of dental infections without imaging (clinical skills become more important as X-ray capability declines)
• Regional anaesthesia techniques to maximise the utility of limited anaesthetic supply (inferior alveolar nerve blocks cover multiple teeth per injection vs. infiltration anaesthesia which covers one tooth per injection)
• Pain management without anaesthetic — patient communication, speed of extraction technique, physical stabilisation methods

Preventive care upskilling:

• Community oral health education delivery
• Fluoride varnish application (while supplies last) prioritised for high-risk children
• Dietary counselling for caries prevention

Scope of practice expansion:

• Dental therapists should have their scope expanded to include adult extractions (currently limited to children and adolescents in most cases). The workforce of ~600 therapists trained in extraction technique represents significant additional capacity
• Dental hygienists should expand into screening, triage, and basic emergency care
• Non-dental health workers in remote communities (nurses, community health workers) should receive basic dental emergency training — extraction of grossly mobile teeth, abscess management, recognition of spreading infections requiring evacuation

8.2 Knowledge preservation

Dental materials science, pharmacology, and advanced technique should be documented and preserved even as the materials to practise them become unavailable. When trade resumes or local production matures, the knowledge to restart modern dentistry should not have to be rediscovered. The dental schools at the University of Otago (NZ’s only dental school, in Dunedin) are the custodians of this knowledge.³⁹

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CRITICAL UNCERTAINTIES

Uncertainty	Impact	Resolution method
Actual NZ dental material stocks	Determines the depletion timeline for all consumables	National asset census (Doc #8) — inventory dental distributors, practices, and hospital dental departments
Zinc oxide industrial stocks in NZ	Determines feasibility and scale of ZOE cement production	Census of industrial chemical suppliers and users
Clove oil / dried clove stocks	Determines eugenol availability for ZOE cement and pain management	Census of dental, pharmaceutical, and food industry stocks
Fluoride chemical stocks for water treatment	Determines how long community water fluoridation can continue	Census of water treatment chemical supply
Dental workforce retention and geographic distribution	Workforce may migrate to urban centres, leaving rural communities without dental care	Workforce planning and regional allocation (Doc #145)
Caries rate trajectory under changed diet	Reduced sugar intake may slow caries; increased stress and reduced hygiene access may accelerate it	Monitor and adapt
Trade route development for cloves, rubber, and other dental-relevant materials	Long-term supply of eugenol, rubber for prosthetics (if ever), and other materials	Dependent on Doc #87, Doc #138, Doc #142
Population acceptance of extraction-dominant care model	Cultural resistance to extraction rather than restoration may reduce treatment uptake	Clear public communication about why the model has changed

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CROSS-REFERENCES

Document	Relationship
Doc #1 — National Emergency Stockpile Strategy	Dental materials under Category B controlled distribution. Dental supply distributor warehouses to be inventoried and managed
Doc #8 — National Asset and Skills Census	Must include dental materials inventory, dental workforce count and geographic distribution, zinc oxide and clove oil stocks
Doc #33 — Tires	Rubber supply constraints affect denture base materials (vulcanite) — confirms NZ has no rubber
Doc #65 — Hydroelectric Maintenance	Grid power enables dental chair lighting, suction, autoclave sterilisation, compressed air, and water fluoridation plant operation
Doc #91 — Machine Shop Operations	Potential fabrication of dental hand instruments (forceps, elevators) using existing metalworking capability
Doc #92 — Blacksmithing and Forge Work	Potential forging of basic dental instruments
Doc #102 — Charcoal Production	Source of activated charcoal for dentifrice
Doc #116 — Pharmaceutical Rationing	Anaesthetic supply (lidocaine), analgesic supply (paracetamol, ibuprofen), antibiotic supply (amoxicillin) for dental infections — all managed under pharmaceutical rationing framework
Doc #117 — Surgical Consumable Conservation	Infection control materials (ethanol antisepsis), suture supply (catgut for post-extraction haemorrhage), sterilisation protocols applicable to dental instruments
Doc #119 — Local Pharmaceutical Production	Long-term production of lidocaine or other local anaesthetics would restore dental procedural capability — this should be included in production priority assessment
Doc #122 — Mental Health	Chronic dental pain and visible tooth loss affect mental health and social functioning. Dental care decisions should be coordinated with mental health support
Doc #138 — Sailing Vessel Design	Sail trade routes to Indonesia and Pacific Islands as source of cloves (eugenol), and potentially other tropical dental-relevant materials
Doc #145 — Workforce Reallocation	Dental workforce distribution and scope-of-practice changes
Doc #142 — Trans-Tasman and Pacific Trade Routes	Trade as a source of dental materials that NZ cannot produce

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FOOTNOTES

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1. Dental Council of New Zealand workforce data. https://www.dcnz.org.nz/ — The Dental Council registers and regulates dental practitioners in NZ. Approximate workforce numbers: ~2,500 dentists, ~600 dental therapists, ~800 dental hygienists, ~1,400 dental technicians/clinical dental technicians, ~2,500 dental assistants. These figures are approximate and based on the most recent available registration data. Exact numbers fluctuate annually.↩︎

2. Henry Schein Halas. https://www.henryschein.co.nz/ — The dominant dental supply distributor in NZ, a subsidiary of Henry Schein Inc. (US). Supplies the majority of NZ dental practices with materials, equipment, and sundries. In-country stock levels are commercially sensitive and not publicly reported. The 2–6 month estimate for pipeline stock is based on standard distribution chain practices and requires verification through census.↩︎

3. Ministry of Health / Manatū Hauora. Community water fluoridation coverage in NZ. https://www.health.govt.nz/ — Approximately 52% of NZ’s population on reticulated water supply receives fluoridated water (as of 2022–2024 data). Coverage varies by region. Fluoride chemicals (sodium fluorosilicate, hydrofluorosilicic acid) are imported.↩︎

4. Before the antibiotic era, dental infections were a significant cause of morbidity and mortality. Ludwig’s angina (submandibular space infection, usually of dental origin) had a mortality rate exceeding 50% before antibiotics. See: Patterson HC, et al. “Ludwig’s angina: an update.” Laryngoscope 92(4):370–378, 1982. Also: historical mortality data from the pre-antibiotic era consistently shows dental abscess as a recognised cause of death.↩︎

5. Dental Council of New Zealand workforce data. https://www.dcnz.org.nz/ — The Dental Council registers and regulates dental practitioners in NZ. Approximate workforce numbers: ~2,500 dentists, ~600 dental therapists, ~800 dental hygienists, ~1,400 dental technicians/clinical dental technicians, ~2,500 dental assistants. These figures are approximate and based on the most recent available registration data. Exact numbers fluctuate annually.↩︎

6. Zinc oxide is used in NZ in multiple industrial applications including paint manufacture, rubber processing, agriculture (zinc supplements for livestock), and pharmaceutical preparations. NZ does not mine zinc. All zinc oxide is imported, either as finished zinc oxide powder or as zinc metal subsequently oxidised. The quantity of zinc oxide in NZ at any given time is unknown from public sources and requires census. Industrial consumers include paint manufacturers, rubber processors, and agricultural supply companies.↩︎

7. Dental Council of New Zealand workforce data. https://www.dcnz.org.nz/ — The Dental Council registers and regulates dental practitioners in NZ. Approximate workforce numbers: ~2,500 dentists, ~600 dental therapists, ~800 dental hygienists, ~1,400 dental technicians/clinical dental technicians, ~2,500 dental assistants. These figures are approximate and based on the most recent available registration data. Exact numbers fluctuate annually.↩︎

8. NZ Dental Association and Ministry of Health data on dental workforce distribution. https://www.nzda.org.nz/ — Rural and remote communities in NZ have documented shortages of dental practitioners, particularly in the East Cape, West Coast, and remote South Island regions. The School Dental Service partially addresses this for children but adult dental access in rural areas is limited.↩︎

9. Ministry of Health. “Our Oral Health: Key findings of the 2009 New Zealand Oral Health Survey.” Also: Ministry of Health data on child dental health through the School Dental Service. Maori and Pacific children have approximately twice the rate of dental caries experience compared to NZ European children. Adult Maori and Pacific populations have higher rates of tooth loss and untreated dental disease.↩︎

10. Dental Council of New Zealand workforce data. https://www.dcnz.org.nz/ — The Dental Council registers and regulates dental practitioners in NZ. Approximate workforce numbers: ~2,500 dentists, ~600 dental therapists, ~800 dental hygienists, ~1,400 dental technicians/clinical dental technicians, ~2,500 dental assistants. These figures are approximate and based on the most recent available registration data. Exact numbers fluctuate annually.↩︎

11. The School Dental Service (now Community Oral Health Service) operates dental clinics in schools across NZ, providing free basic dental care (examination, prevention, simple restorations, extractions) to children from birth to Year 8 (approximately age 12–13). Staffed primarily by dental therapists. This infrastructure represents an existing distributed network for preventive care delivery.↩︎

12. Henry Schein Halas. https://www.henryschein.co.nz/ — The dominant dental supply distributor in NZ, a subsidiary of Henry Schein Inc. (US). Supplies the majority of NZ dental practices with materials, equipment, and sundries. In-country stock levels are commercially sensitive and not publicly reported. The 2–6 month estimate for pipeline stock is based on standard distribution chain practices and requires verification through census.↩︎

13. Henry Schein Halas. https://www.henryschein.co.nz/ — The dominant dental supply distributor in NZ, a subsidiary of Henry Schein Inc. (US). Supplies the majority of NZ dental practices with materials, equipment, and sundries. In-country stock levels are commercially sensitive and not publicly reported. The 2–6 month estimate for pipeline stock is based on standard distribution chain practices and requires verification through census.↩︎

14. Dental local anaesthetic cartridge consumption estimate: NZ’s ~2,500 dentists each use an estimated average of 5–15 cartridges per working day (varies widely by practice type). At approximately 240 working days per year, total annual consumption is in the range of 3–9 million cartridges. In-country distributor stock of perhaps 1–4 months of consumption suggests several hundred thousand to perhaps 2–3 million cartridges at any time. This estimate is rough and requires census verification.↩︎

15. Lidocaine hydrochloride is available as a bulk powder from pharmaceutical raw material suppliers. Formulation into injectable dental cartridges requires sterile compounding under aseptic conditions, appropriate preservatives, vasoconstrictor (adrenaline/epinephrine), pH adjustment, and cartridge/syringe filling — well beyond standard dental practice capability but feasible in hospital pharmacy settings. See also Doc #119 for pharmaceutical production priorities.↩︎

16. Dental amalgam has been used since the 1830s. Its durability, ease of placement, and tolerance of moisture contamination make it superior to most alternative restorative materials in austere conditions. Mercury toxicity from dental amalgam is a topic of ongoing debate; the WHO and most dental authorities consider dental amalgam safe for patients. In a survival context, the risk-benefit calculation strongly favours using available amalgam. See: FDI World Dental Federation policy statement on dental amalgam, 2019.↩︎

17. Zinc oxide-eugenol cement was first described for dental use in the mid-19th century. It remains in widespread clinical use as a sedative dressing, temporary restoration, and root canal sealer. See: Markowitz K, et al. “Biologic properties of eugenol and zinc oxide-eugenol.” Oral Surgery, Oral Medicine, Oral Pathology 93(1):5–16, 1992.↩︎

18. Zinc phosphate cement has been used in dentistry since the late 19th century as a luting agent and base material. It is formed by mixing zinc oxide powder with phosphoric acid (30–40% concentration). Setting occurs through an acid-base reaction forming zinc phosphate. See: Smith DC. “Dental Cements.” Advances in Dental Research 2(1):134–141, 1988. Phosphoric acid availability in NZ is uncertain — it is used in fertiliser production, food processing, and metal treatment.↩︎

19. Zinc oxide is used in NZ in multiple industrial applications including paint manufacture, rubber processing, agriculture (zinc supplements for livestock), and pharmaceutical preparations. NZ does not mine zinc. All zinc oxide is imported, either as finished zinc oxide powder or as zinc metal subsequently oxidised. The quantity of zinc oxide in NZ at any given time is unknown from public sources and requires census. Industrial consumers include paint manufacturers, rubber processors, and agricultural supply companies.↩︎

20. Eugenol (4-allyl-2-methoxyphenol) comprises 70–90% of oil of cloves. It has documented analgesic, anti-inflammatory, and antibacterial properties. Its use in dentistry dates to at least the 17th century. See: Markowitz K, et al. (1992) as above. Also: Chaieb K, et al. “The chemical composition and biological activity of clove essential oil, Eugenia caryophyllata.” Phytotherapy Research 21(6):501–506, 2007.↩︎

21. Clove oil yield from dried clove buds by steam distillation is approximately 15–20% by weight. The process requires a simple distillation apparatus — a pot, condenser (copper coil cooled by water), and collection vessel. This is well within NZ’s fabrication capability (Doc #51). See: standard essential oil distillation references; also Burt S. “Essential oils: their antibacterial properties and potential applications in foods.” International Journal of Food Microbiology 94(3):223–253, 2004.↩︎

22. Eugenol (4-allyl-2-methoxyphenol) comprises 70–90% of oil of cloves. It has documented analgesic, anti-inflammatory, and antibacterial properties. Its use in dentistry dates to at least the 17th century. See: Markowitz K, et al. (1992) as above. Also: Chaieb K, et al. “The chemical composition and biological activity of clove essential oil, Eugenia caryophyllata.” Phytotherapy Research 21(6):501–506, 2007.↩︎

23. Rongoa Maori references: Riley M. Maori Healing and Herbal. Viking Sevenseas NZ Ltd, 1994. Also: Brooker SG, Cambie RC, Cooper RC. New Zealand Medicinal Plants. Heinemann, 1981. Kawakawa has documented traditional use for toothache. Koromiko for mouth and throat infections. These uses are part of a broader system of traditional medicine that should be respected and integrated through partnership with Maori health practitioners.↩︎

24. Clove trees (Syzygium aromaticum) are native to the Maluku Islands (Indonesia) and require tropical conditions: temperatures consistently above 20°C, high humidity, and no frost. They begin producing flower buds (the “clove”) at 6–8 years of age. NZ’s climate is too cool and seasonal for clove cultivation at any latitude.↩︎

25. Hydrogen peroxide as an oral antiseptic: effective at 1–3% concentration for short-term use. See: Marshall MV, et al. “Hydrogen peroxide: a review of its use in dentistry.” Journal of Periodontology 66(9):786–796, 1995. Long-term production depends on chemical industry development — hydrogen peroxide is produced industrially by the anthraquinone process, which requires a functioning organic chemical industry.↩︎

26. Beeswax and pine resin have historical use as temporary tooth fillings in folk dentistry. Neither is durable — they soften at mouth temperature and dissolve slowly in saliva. Their use is documented in historical dental references. NZ has beeswax from apiaries (~9,000 registered beekeepers per ApiNZ data, Doc #83) and pine resin from plantation forests (Doc #99).↩︎

27. Brooks JK, et al. “Charcoal and charcoal-based dentifrices: a literature review.” Journal of the American Dental Association 148(9):661–670, 2017. Charcoal dentifrices provide mechanical cleaning but lack fluoride protection and may cause enamel abrasion. In the absence of fluoride toothpaste, charcoal is an imperfect but available substitute.↩︎

28. Sodium bicarbonate as a dentifrice: Putt MS, et al. “Enhancement of plaque removal efficacy by tooth brushing with baking soda dentifrices.” Journal of Clinical Dentistry 19(4):111–119, 2008. Also: ADA Council on Scientific Affairs. “Baking soda dentifrices.” JADA 148(11):e1–e8, 2017. Baking soda (NaHCO₃) has been used as a tooth-cleaning agent since the 19th century. It is mildly abrasive and alkaline, providing mechanical cleaning and partial neutralisation of bacterial acids. Producible from soda ash (sodium carbonate) by reaction with carbon dioxide and water — a well-established chemical process.↩︎

29. Dental extraction technique is taught in all dental and dental therapy training programmes and is described in standard oral surgery texts. See: Fragiskos FD. “Oral Surgery.” Springer, 2007. The instruments required — forceps, elevators, mouth mirrors — are durable stainless steel and do not degrade meaningfully over decades with proper care.↩︎

30. Before the antibiotic era, dental infections were a significant cause of morbidity and mortality. Ludwig’s angina (submandibular space infection, usually of dental origin) had a mortality rate exceeding 50% before antibiotics. See: Patterson HC, et al. “Ludwig’s angina: an update.” Laryngoscope 92(4):370–378, 1982. Also: historical mortality data from the pre-antibiotic era consistently shows dental abscess as a recognised cause of death.↩︎

31. Manuka honey antibacterial properties: Molan PC. “The antibacterial activity of honey.” Bee World 73(1):5–28, 1992. Also: Carter DA, et al. “Therapeutic manuka honey: no longer so alternative.” Frontiers in Microbiology 7:569, 2016. Manuka honey’s antibacterial activity is primarily due to methylglyoxal (MGO) and is effective against a range of oral bacteria including Streptococcus mutans (the primary caries-causing bacterium).↩︎

32. Rongoa Maori references: Riley M. Maori Healing and Herbal. Viking Sevenseas NZ Ltd, 1994. Also: Brooker SG, Cambie RC, Cooper RC. New Zealand Medicinal Plants. Heinemann, 1981. Kawakawa has documented traditional use for toothache. Koromiko for mouth and throat infections. These uses are part of a broader system of traditional medicine that should be respected and integrated through partnership with Maori health practitioners.↩︎

33. Ministry of Health / Manatū Hauora. Community water fluoridation coverage in NZ. https://www.health.govt.nz/ — Approximately 52% of NZ’s population on reticulated water supply receives fluoridated water (as of 2022–2024 data). Coverage varies by region. Fluoride chemicals (sodium fluorosilicate, hydrofluorosilicic acid) are imported.↩︎

34. Community water fluoridation: the evidence base for caries prevention is extensive and robust. See: McDonagh MS, et al. “Systematic review of water fluoridation.” BMJ 321(7265):855–859, 2000. Also: NZ National Fluoridation Information Service. The typical caries reduction attributed to community water fluoridation is approximately 25–30% compared to non-fluoridated populations.↩︎

35. Pre-nylon toothbrushes used animal bristle (typically boar/pig hair or horsehair) set into bone or wooden handles. Mass-produced bristle toothbrushes were common from the 18th century through the 1930s. Nylon bristles were introduced in 1938. NZ has both pig hair (from meat processing) and horsehair available. Miswak (chewing stick) use is documented in many cultures; the WHO has endorsed chewing sticks as an effective oral hygiene tool when toothbrushes are unavailable.↩︎

36. Dietary sugar and caries: the relationship is among the most robust in nutrition science. See: Sheiham A, James WPT. “Diet and dental caries: the pivotal role of free sugars reemphasized.” Journal of Dental Research 94(10):1341–1347, 2015. Frequency of sugar exposure is more important than total quantity. Starchy foods (potatoes, bread) have some cariogenic potential through salivary amylase conversion to sugars, but less than refined sugar.↩︎

37. Dental Council of New Zealand workforce data. https://www.dcnz.org.nz/ — The Dental Council registers and regulates dental practitioners in NZ. Approximate workforce numbers: ~2,500 dentists, ~600 dental therapists, ~800 dental hygienists, ~1,400 dental technicians/clinical dental technicians, ~2,500 dental assistants. These figures are approximate and based on the most recent available registration data. Exact numbers fluctuate annually.↩︎

38. History of denture materials: Rueggeberg FA. “From vulcanite to vinyl, a history of resins in restorative dentistry.” Journal of Prosthetic Dentistry 87(4):364–379, 2002. Vulcanised rubber (vulcanite) was the standard denture base from approximately 1855 to 1940, when acrylic resin (PMMA) replaced it. Before vulcanite, denture bases were carved from ivory, bone, wood, or fabricated from precious metals.↩︎

39. University of Otago Faculty of Dentistry. https://www.otago.ac.nz/dentistry — NZ’s sole dental school, located in Dunedin. Trains dentists, dental therapists, dental hygienists, and dental technicians. The faculty’s research programmes, teaching resources, and clinical expertise represent NZ’s primary repository of dental knowledge. Preserving this institution’s capability through the crisis period is essential for long-term dental care recovery.↩︎