All-on-6 vs All-on-4 Implants: Which Is Better? (Melbourne 2026 Comparison)

Important Clinical Scope Notice: Oak Park Denture Clinic specializes in the prosthetic design, laboratory fabrication, and ongoing maintenance of implant-retained dentures and bridges. We do not perform surgical implant placement. Surgical procedures are carried out by registered dental surgeons or implantologists. We work in close coordination with your surgeon to fabricate your custom prosthetics.

All-on-6 vs All-on-4: Understanding the Difference

When evaluating full-arch fixed dental implants, patients frequently ask: "Why would I choose All-on-6 instead of All-on-4? Are six implants always better than four?"

The short answer: All-on-6 provides greater load distribution and redundancy, making it ideal for heavy chewers, patients who grind their teeth (bruxism), or wider jaw spans. However, All-on-4 is clinically proven, requires less bone volume in the back of the jaw, and costs less.

Here is a practical comparison to help you evaluate which system fits your mouth.

What Is the Mechanical Difference?

┌─────────────────────────────────────────────────────────────┐
│                 ALL-ON-4 VS ALL-ON-6 ANATOMY                │
├──────────────────────────────┬──────────────────────────────┤
│ ALL-ON-4                     │ ALL-ON-6                     │
│ 4 titanium implants          │ 6 titanium implants          │
│ 2 straight front / 2 angled  │ 4 front / 2 back or 6 upright│
│ Bypasses sinus cavity        │ Requires more posterior bone │
│ Cost: $20,000 – $25,000      │ Cost: $25,000 – $32,000      │
└──────────────────────────────┴──────────────────────────────┘

All-on-4 Architecture

All-on-4 uses two straight vertical implants in the front and two posterior implants tilted up to 45 degrees. Tilting the posterior implants allows them to anchor into the dense bone at the front of the mouth while extending the support bridge back toward the molars.

All-on-6 Architecture

All-on-6 adds two additional implant fixtures in the posterior or premolar regions. This creates six anchor points across the arch, spreading bite forces more evenly along the entire curved span of the jawbone.

When Is All-on-6 Clinically Recommended?

1. High Bite Force & Nocturnal Bruxism: If you have strong jaw musculature or a history of severe clenching/grinding, six implants distribute lateral shearing forces more effectively, reducing mechanical strain on individual screws.
2. Larger Jawbone Arch (Wider Span): In larger jaws, a 4-implant system creates longer "cantilevers" (sections of bridge hanging unsupported behind the back implants). Adding two extra implants eliminates long cantilevers.
3. Upper Jaw (Softer Maxillary Bone): The bone of the upper jaw (maxilla) is naturally softer and less dense than the lower jaw (mandible). Placing six implants in the upper arch provides additional stability.

Side-by-Side Comparison

Frequently Asked Questions

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

Neither is universally better. All-on-6 offers extra stability and redundancy for patients with strong jaw muscles and ample bone height. All-on-4 is the preferred clinical approach when bone volume in the back of the jaw is limited, as it avoids complex bone grafting.

What is the price difference between All-on-4 and All-on-6?

In Melbourne, All-on-6 typically costs $3,000 to $6,000 more per arch than All-on-4 due to the surgical placement of two extra titanium fixtures, two additional multi-unit abutments, and more complex lab superstructure design.

What happens if one implant fails in an All-on-6 system?

In an All-on-6 setup, if one implant fails, the remaining five fixtures are often strong enough to support the bridge while the failed site heals, preventing the need to wear a temporary removable denture during revision.

How long does surgery take for All-on-6 compared to All-on-4?

Placing six implants typically takes 2.5 to 3.5 hours per arch under local anaesthesia or IV sedation, compared to roughly 1.5 to 2.5 hours for an All-on-4 procedure.

Consult With Our Team in Oak Park

Book an in-person assessment at Oak Park Dental & Denture Clinic. We will evaluate your jawbone anatomy, explain your options clearly, and coordinate your care with trusted oral surgeons.