All-on-4 vs 6 vs 8 Compared

Losing most or all of your teeth — and facing quotes of AUD $30,000–$60,000 per arch in Australia — is one of the most financially stressful dental situations Australians encounter. Full-arch implant options (All-on-4, All-on-6, All-on-8) can cut that cost by 50–65% overseas. But first you need to understand what the numbers actually mean for your jaw.

More implants is not automatically better — it is better for certain cases. A well-planned All-on-4 outperforms an unnecessary All-on-6 every time. The right number is a clinical judgement about your bone and bite, not a product tier to upgrade.

Quick reference: All-on-4 vs All-on-6 vs All-on-8

What the numbers actually mean

All three options restore a full arch — upper or lower — with a fixed bridge of prosthetic teeth screwed directly onto implants. You leave with a complete set of teeth, not a denture. The sole structural difference between the options is how many titanium implants anchor that bridge.

All-on-4 places four implants per arch, with the two rear implants angled up to 45 degrees to avoid key anatomical structures and maximise contact with available bone. All-on-6 adds two more implants in the posterior region for additional support. All-on-8 adds two more again and is typically reserved for high-demand cases where bone volume is sufficient and bite forces are very strong.

Key facts for Australians:

• Overseas full-arch implants cost 50–65% less than equivalent treatment in Australia.
• Two trips are standard: surgery trip of 7–10 days, then a return trip of 3–5 days for the permanent bridge 3–6 months later.
• The bridge material — acrylic vs full zirconia — affects durability and cost as much as implant count does.
• All-on-4 is the most widely performed full-arch option globally, with large volumes at accredited overseas clinics.
• CT imaging (cone-beam scan) is essential before any full-arch plan — no reputable clinic should quote without one.

How the choice is actually made

The decision comes from a CT-based clinical assessment of your jaw, weighing four factors:

Bone volume and quality. More implants require more healthy bone. Where bone has been lost — common after years of missing teeth — fewer implants may be more practical, or bone grafting may be needed first. See the bone graft and sinus lift cost guide if this applies to you.

Which arch is being treated. The lower jaw has denser bone and handles different bite forces than the upper jaw. Clinicians sometimes favour six implants in the lower arch to handle heavier chewing loads, while four implants in the upper arch may be entirely appropriate.

Bite force and habits. Heavy grinders (bruxism) put significantly greater stress on implants. For these patients, more anchor points reduce the risk of prosthetic failure over time.

Cost. More implants cost more. That cost increase has to be justified by genuine clinical benefit for your specific case — not by a general “more is safer” rationale.

A reputable clinic explains precisely why it recommends a particular number for you, based on your CT scan. Be cautious of a flat “more is always better” pitch — that can be upselling. Be equally cautious of a bare-minimum plan that ignores your bone density. Use the clinic vetting checklist to distinguish between the two.

Bottom line for Australians: if two clinics recommend different implant counts, ask each to show you the CT and explain the clinical reasoning. A confident, evidence-based explanation is the mark of a trustworthy clinic.

The other big variable: bridge material

Implant count is only half of the full-arch decision. The prosthetic bridge fixed on top — acrylic versus full zirconia — affects strength, aesthetics, longevity and cost at least as much as going from four to six implants.

Acrylic bridges are lighter and less expensive but wear faster and are more prone to fracture over time. Full zirconia bridges are harder, more durable, and look more like natural teeth, but they cost more and add weight the implants must support. The zirconia vs E-max vs PFM guide covers this in detail. The All-on-4 cost guide shows how both choices — implant count and bridge material — move the final price.

Timeline: what two trips actually looks like

Most All-on-4, All-on-6, and All-on-8 cases follow the same two-trip structure, regardless of implant count.

Trip one (7–10 days): Arrive, cone-beam CT scan taken or reviewed, implants placed under local anaesthetic with sedation available, provisional (temporary) bridge attached the same day or within 24–48 hours. You fly home with a functional set of teeth.

Trip two (3–5 days, 3–6 months later): The implants have integrated with your bone. The permanent bridge — usually zirconia — is fitted, adjusted, and polished. This trip is shorter and less intensive than the first.

Vietnam and Thailand are both 8–9 hours from the east coast of Australia by direct flight. Bali is around 6 hours. The how long does implant treatment take overseas guide covers scheduling in detail.

Putting it together

The right full-arch solution is the one matched to your jaw — not the one with the highest implant count or the lowest price tag. Decide the treatment with a clinician (implant count and bridge material, based on CT imaging), then vet the clinic doing it, understand the true cost, and compare destinations to find the best fit for your timeline and budget.

Australians who go to well-credentialled clinics in Vietnam, Thailand, or Bali routinely save AUD $15,000–$40,000 on full-arch treatment. Many have excellent outcomes. The savings are real — provided the clinical decision about implant count and material is made correctly first.

The verdict: All-on-4, All-on-6 and All-on-8 are tools, not tiers. The right one is whichever your bone and bite actually support. Get the CT done, get the clinical rationale in writing, and the number will become obvious.