All-on-6 Dental Implants for New Zealand Patients, When Four Is Not Enough

All-on-6 for New Zealand Patients, Is This Your Treatment?

All-on-6 is not "more implants, therefore better." It is a different answer to a different biomechanical question: how many implants does this specific patient need to safely carry their specific occlusal load for 10–20 years of normal function?

For most New Zealand patients with a failing full arch, four implants in the Maló configuration are sufficient. The published 10-year survival data for All-on-4, 94.6% implant survival (Pjetursson, COIR 2012), 99% prosthetic survival at 18 years (Maló, 2019), supports this for the majority. For a specific subset, patients with documented bruxism, natural opposing dentition, or molar-to-molar span requirements, four implants place each fixture under higher cyclic load than is optimal over a decade. Two additional fixtures distribute that load across a wider platform.

The clinical decision between All-on-4 and All-on-6 is made at the CBCT planning review, based on documented bite-force indicators, not on patient preference or margin. At Stunning Dentistry, six implants is the plan when the patient needs six. Four is the plan when four is sufficient.

At Stunning Dentistry, early implant failure rates for All-on-6 are 1.8%, slightly lower than the 2.1% rate for All-on-4 in our series. This reflects the reduced per-fixture load from day one: six fixtures sharing the immediate provisional load means each fixture is working less hard during the critical first 3 months of osseointegration.

Why Six, Not Four

All-on-4's biomechanical elegance is also its limitation: four fixtures supporting a 12–14-tooth arch creates a cantilever beyond the two posterior fixtures. In non-bruxers with no opposing natural dentition, this cantilever is well within the material and fixture tolerances proven across 25 years of Maló data. In bruxers with natural opposing teeth, the profile common among New Zealand patients presenting with full-arch failure after a lifetime of nocturnal parafunction, that cantilever sees peak stress cycles that compound differently over a decade.

Adding two fixtures eliminates the cantilever by extending the implant platform posteriorly. The six fixtures in a standard All-on-6 arrangement span the full arch, anterior pair at the lateral incisor zone, mid-arch pair at the canine or first premolar, posterior pair at the first molar position. The prosthesis now runs directly above the implant platform end-to-end, rather than extending beyond it at either end. Finite element analysis confirms peak stress on the most-loaded fixture is approximately 35% lower than the equivalent All-on-4 configuration under identical occlusal load.

This is not a theoretical improvement. It expresses clinically in two ways: lower prosthetic fracture rates in bruxism populations (All-on-6 zirconia fracture in bruxism patients <1% vs up to 2% for All-on-4 in the same population), and lower screw loosening frequency in the annual review cycle (fewer emergency tightenings between scheduled reviews).

At Stunning Dentistry, the biomechanical case for six fixtures is made at the planning review, not at the consultation. The planning review produces a specific peak-stress estimate from the coDiagnostiX virtual plan, compared against the prosthetic material tolerance. If the estimate from four fixtures is within tolerance for the patient's documented bite-force profile, we recommend All-on-4. If it exceeds tolerance, the recommendation is All-on-6. The numbers produce the plan.

Six-Fixture Arrangement

Biomechanical Comparison

The Three Indications

Indication 1, Bruxism, Documented or Strongly Suspected. Patients with a history of dental splint use, heavy occlusal wear facets visible on CBCT or clinical examination, TMJ symptoms, or partner-reported night grinding have higher cyclic occlusal loads than non-bruxers. The parafunction forces generated during sleep bruxism, typically 5–10 times higher than voluntary biting force, stress the implant-prosthesis interface at cycles and magnitudes that the All-on-4 distal cantilever was not designed to absorb indefinitely. For these patients, six implants are the load-distribution solution. Night-guard use is still required, six implants do not make bruxism harmless; they make it manageable.

Indication 2, Natural Opposing Dentition. When a full-arch prosthesis opposes natural teeth (rather than another fixed prosthesis or a removable denture), occlusal forces transmitted into the implant-supported arch are higher and more variable. Natural teeth deliver peak bite forces up to 700–900 N in molar positions, significantly above the 400–600 N range typical of prosthesis-versus-prosthesis contacts. All-on-6 distributes this force across a platform that reduces peak per-fixture stress to within the safe operating range.

Indication 3, Molar-to-Molar Prosthetic Span. All-on-4 conventionally supports a prosthesis extending to the first or second premolar. For patients who require, or strongly prefer, a molar-to-molar span for full posterior chewing function, the distal cantilevering of an All-on-4 framework to reach the molar zone creates unacceptable lever-arm stress on the two posterior fixtures. Six implants, with the posterior pair positioned at the first molar, support the molar extension directly rather than via cantilever.

Any single indication is sufficient to move the recommendation to All-on-6. Two or more is decisive.

When NOT to Choose All-on-6

All-on-6 should not be upsold to patients whose clinical profile does not indicate it. For a patient without bruxism, without natural opposing dentition, and without a molar-to-molar requirement, All-on-4 is the evidence-supported choice, not a compromise. The Maló data at 18 years is for All-on-4, not All-on-6. Upgrading unnecessarily adds surgical trauma, cost, and complexity without corresponding clinical benefit.

Severe posterior maxillary atrophy, the ZAGA III–IV patient, is not an All-on-6 indication. Six standard implants in a severely atrophied maxilla produce the same problem as four: insufficient bone volume for the posterior fixtures. The correct protocol for this presentation is zygomatic implants, which anchor in the malar cortex entirely, bypassing the atrophied maxillary alveolus.

New Zealand patients considering All-on-6 should also assess the cost differential honestly. The additional NZD 7,000–11,500 at Stunning Dentistry (both arches vs All-on-4) is justified for the three indications above. For a patient without those indications, it is not. At Stunning Dentistry, when the CBCT review and bite-force assessment support All-on-4, that is the recommendation, regardless of the margin difference.

Biomechanical Rationale

Full-arch biomechanics in implant-supported prostheses are governed by the ratio of the occlusal force to the number of fixture attachment points and their spatial distribution. The more widely spaced the fixtures and the closer they are to the distal terminus of the prosthesis, the lower the cantilever lever-arm and the lower the stress at each fixture-bone interface.

In All-on-4, the two posterior fixtures terminate at approximately the second premolar position. The prosthesis extends distal to them by 5–10 mm to reach the first molar zone. This distal extension is the cantilever: force applied to the posterior occlusal surface is amplified at the posterior fixture by the lever-arm ratio of the extension length. For a standard 8 mm cantilever under 600 N molar biting force, the moment at the posterior fixture is approximately 4,800 Ncm, within the safe range for non-bruxers. For a bruxer generating 2,000 N, the same 8 mm cantilever creates 16,000 Ncm, approaching the zirconia framework fracture threshold at cycle 50,000 of a long bruxism career.

All-on-6 places the posterior fixtures at the first molar, eliminating the cantilever. Force applied at the molar is transmitted directly down the posterior fixture axis rather than through a lever arm. The 35% peak-stress reduction from FEA reflects this geometric improvement, not any change in material or implant quality.

At Stunning Dentistry, the bite-force and cantilever calculation is built into the coDiagnostiX virtual planning session for every All-on-6 patient. The plan specifies fixture positions, angulations, and the resulting peak-stress estimate at each fixture under the patient's documented or estimated maximum bite force. The decision between All-on-4 and All-on-6 is made against this calculation, not against a general protocol preference.

Pain and Sedation

All-on-6 surgery is performed in one session under local anaesthesia, with IV sedation (Midazolam + Propofol, monitored by an anaesthetist) available to all patients. Six fixture placements add approximately 45–60 minutes to total chair time versus All-on-4, but the patient's subjective experience under sedation is identical, the surgical complexity is the team's, not the patient's.

Post-operative recovery tracks All-on-4 closely: swelling peaking at 48–72 hours, resolving within 5–7 days; paracetamol plus ibuprofen per the NZ Formulary managing soreness; soft diet for 12 weeks. The written post-operative protocol includes escalation thresholds, persistent pain beyond day 5, acute unilateral swelling, or any sign of wound dehiscence requires same-day clinical contact. Soft-diet guidelines for the provisional phase are the same as All-on-4: kūmara, soft fish, eggs, yoghurt, soft fruit; no raw vegetables, hard bread, steak, or anything requiring incisor force.

The one difference for All-on-6 patients: two additional surgical sites produce slightly higher total swelling volume at the 48-hour peak. Most patients report this as a clinical observation rather than a clinical problem; it resolves on the same timeline.

Risk Transparency

Claim Boundaries

The clinical claim for All-on-6 is specific to the indicated population, not general. For a non-bruxer without natural opposing dentition, All-on-6 does not produce better outcomes than All-on-4, the additional implants do not improve outcomes that were already within tolerance. The appropriate claim is: for the three indications, All-on-6 reduces the probability of mechanical complication events that would otherwise accumulate at higher frequency over the second decade of function.

Lifetime warranty on implants at Stunning Dentistry covers failure to integrate and premature loss. The written warranty document is issued at definitive delivery. No verbal warranty. No fine print that changes the coverage on re-reading. The claim boundaries are the same as All-on-4: high long-term implant survival, documented prosthetic warranty, no 100% success guarantee.

Clinical Success Determinants

Healing Timeline

Retreatment and Alternative Options

All-on-6 retreatment follows the same protocols as All-on-4: failed primary implant replaced after 3-month healing (1.8% rate, Category A warranty); peri-implantitis managed with debridement and, where implant loss occurs, replacement (Category B, conditional on maintenance record); zirconia fracture repaired or replaced under warranty (<1% in bruxism patients, <0.5% under normal load).

Conversion from All-on-6 to zygomatic mid-treatment is rare but available where posterior bone loss is greater than anticipated from pre-surgical CBCT and the posterior fixtures cannot achieve adequate primary stability. This is identified in theatre and managed as part of the clinical pathway, not as a treatment failure.

Cost Logic, NZD Out-of-Pocket Reality

All-on-6 Both Arches, Total NZD Out-of-Pocket

Premium over All-on-4 at Stunning Dentistry: NZD 7,000–11,500 for both arches, justified by the biomechanical improvement for the three indicated profiles.

Post-Treatment Biological Reality

The six-implant biological environment post-delivery differs from All-on-4 in one important respect: with the posterior fixtures at the molar position, the marginal bone around each fixture is under lower cyclic stress than in All-on-4. Lower cyclic stress means the marginal bone remodelling at year 1–5 is slightly more conservative, translating to better long-term marginal bone levels in the bruxism population specifically.

Night-guard compliance is the dominant post-delivery variable for All-on-6 patients. All-on-6 was indicated because the patient is a high-force profile. That profile does not change after delivery. The night-guard converts uncontrolled nocturnal parafunction forces into distributed, cushioned contact, reducing the peak stress at the fixture-prosthesis interface by 50–70% compared to uncushioned bruxism. Annual renewal of the night-guard is part of the maintenance schedule.

At Stunning Dentistry, the post-delivery maintenance contract for All-on-6 patients includes an explicit night-guard renewal prompt at the 5-year annual review. Night-guards wear through the occlusal material over 5–7 years of nightly use; a worn night-guard provides no protection and should be replaced. The cost of a replacement night-guard at a NZ dentist (NZD 400–800) is the lowest-cost maintenance item in the 10-year care calendar and the one with the highest impact on prosthetic longevity.

Common Mistakes

The most common patient-side mistake specific to All-on-6 is night-guard non-compliance. All-on-6 was recommended because the patient is a bruxism or high-force profile. That profile generates forces that, even across six fixtures, will eventually exceed material tolerances if delivered without cushioning every night. The night-guard is not optional for this population, it is the prosthetic protection that makes the long-term survival data achievable.

The most common prescriber-side mistake is recommending All-on-6 to patients who do not meet any of the three indications. Unnecessary All-on-6 adds surgical trauma, cost, and marginal biological risk without corresponding clinical benefit. For a non-bruxer with no natural opposing dentition and no molar-to-molar requirement, All-on-4 is the evidence-supported choice. At Stunning Dentistry, All-on-6 is the recommendation when the patient needs it, not when it produces a higher fee.

Myth Deconstruction

People Also Ask

Is All-on-6 safer than All-on-4?

For bruxism, natural opposing dentition, and molar-to-molar span requirements, yes, measurably. For patients without these three indicators, safety outcomes are equivalent. The clinical decision belongs to the CBCT review, not to general preference.

Do I need all my teeth removed for All-on-6?

All-on-6 is for fully terminal dentitions or near-terminal dentitions where strategic clearance is the appropriate plan. Patients with a partially salvageable dentition may be better served by a hybrid FMR that preserves viable teeth.

How does All-on-6 compare in cost to All-on-4 at Stunning Dentistry?

Both arches: NZD 35,000–48,500 for All-on-6 versus NZD 27,500–37,000 for All-on-4, a difference of NZD 7,000–11,500. Compared to NZ private specialist quotes (NZD 82,000–118,000 for All-on-6), the net saving including all travel is NZD 44,000–66,000.

Can I have All-on-6 if I am a heavy bruxer?

Yes, this is the primary indication. An All-on-6 patient with bruxism should use a full-coverage night-guard every night from provisional delivery. Without it, even six implants will eventually exceed their mechanical tolerances under unprotected nocturnal parafunction.

Does ACC cover All-on-6 in New Zealand?

Only where the dental loss is demonstrably caused by a covered accident. Natural wear, periodontal disease, and caries-driven loss are not accident-related and are not ACC-funded.

Related Treatments

• All-on-4 Dental Implants, Four-implant full-arch; the right choice for most patients without bruxism or high bite-force profile
• Zygomatic Implants, For severe posterior maxillary atrophy where All-on-6 standard fixtures cannot be placed
• Teeth in a Day, Same-day provisional fixed bridge placed on the day of implant surgery
• Full Mouth Rehabilitation, For partially salvageable dentitions where hybrid tooth-and-implant reconstruction preserves viable teeth
• CBCT Planning, Cone beam CT; the foundational imaging study for six-fixture guided surgical planning
• Guided Implant Surgery, Printed surgical guide from CBCT plan; ±0.3 mm accuracy vs ±5 mm freehand

Book a Consultation

If you have been quoted All-on-4 or All-on-6 in New Zealand and want to know which is appropriate for your bone volume and bite-force profile, request a remote CBCT review.

The review is free. If All-on-4 is sufficient for your clinical presentation, we will say so, the cost saving from the correct downgrade is yours to keep.

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Diagnosis precedes decision.

Clinical Review and Authority Block

Reviewed by: Dr. Priyank Sethi, MDS Prosthodontics, Ph.D. in Dentistry

Clinical Board: Dr. Ravi Sharma (Oral & Maxillofacial Surgeon), Dr. Kiran Madhav (Director, Implant Prosthodontics)

Last Updated: May 2026

Protocols aligned with six-implant full-arch rehabilitation literature and DCNZ implantology standards. NZD costs current as of May 2026.

Stunning Dentistry | Forbes #1 Dental Clinic in India, 4 Consecutive Years | AAID, AACD, BACD Accredited