All-on-4, All-on-6, and All-on-8 are three full-arch implant options that differ primarily in the number of implants used to support a fixed bridge. The right choice depends on your bone structure, bite force, and clinical needs.
If you are missing most or all of your teeth, dealing with failing teeth, or struggling with loose dentures, a full-arch implant solution can completely change the way you eat, speak, and smile.
At Radiant Smiles Perth, we help patients understand the real differences between All-on-4, All-on-6, and All-on-8 dental implants so that you can make a confident and informed decision. If you are ready to explore your options, our team can assess your smile, review your bone structure, and recommend the most suitable treatment plan for your needs.
Key Takeaways
- All-on-4 uses four implants to support a full arch and is often chosen when patients want a streamlined, efficient full-mouth restoration.
- All-on-6 uses six implants, which can provide additional support and help spread bite forces more broadly across the jaw.
- All-on-8 uses eight implants and is considered in more selective cases where extra support points are appropriate.
- More implants do not automatically mean a better result. The best option depends on your anatomy and treatment needs.
- The best way to choose between All-on-4, All-on-6, and All-on-8 is through a proper clinical assessment and 3D imaging.
What are Full-Arch Dental Implants?
Full-arch dental implants are used to replace an entire upper arch, lower arch, or both with a fixed bridge supported by dental implants. Unlike traditional removable dentures, a fixed implant bridge stays in place, which gives patients greater confidence when speaking, eating, and smiling.
What is All-on-4?
All-on-4 is a full-arch implant treatment that uses four implants to support a fixed bridge. In the classic approach, two implants are placed at the front of the jaw and two are angled toward the back to make the most of the available bone. This is one reason All-on-4 is so well known: it can often provide a fixed solution in cases where bone volume is more limited.
All-on-4 is often the option patients first ask about because it is one of the most recognised full-arch solutions. It can reduce the number of implants required, simplify treatment in the right case, and provide a stable alternative to dentures.
What is All-on-6?
All-on-6 is similar in concept to All-on-4, but it uses six implants instead of four to support the bridge. Those extra implants create more support points across the arch, which can help with stability and force distribution.
All-on-6 is considered when the patient has enough bone to accommodate more implants and when a little extra support is beneficial. This may be especially relevant in cases involving stronger bite forces, a larger arch, or more demanding restorative goals.
What is All-on-8?
All-on-8 uses eight implants to support a full-arch restoration. It is usually presented as a higher-support option because it spreads the load across more implants and offers more points of anchorage.
That said, All-on-8 is not automatically the best choice for everyone. It is usually reserved for more selective cases where the anatomy allows for it and where the treatment plan benefits from the additional support. It should not be treated as a default upgrade from All-on-4 or All-on-6.
All-on-4 vs. All-on-6 vs. All-on-8 | The Differences Explained
The most obvious difference is the number of implants used. All-on-4 uses four implants, All-on-6 uses six, and All-on-8 uses eight.
The key differences come down to bone requirements, surgery complexity, cost, support points, and which cases each option suits best – as outlined in the table below.
| Factor | All-on-4 | All-on-6 | All-on-8 |
|---|---|---|---|
| Implants used | 4 | 6 | 8 |
| Bone needs | Lower | Moderate to higher | Highest |
| Surgery complexity | Lower | Moderate | Higher |
| Cost | Lower | Higher | Highest |
| Support points | Good | More | Most |
| Best for | Efficient full-arch treatment | Added support | Selective high-support cases |
While the table above highlights the general differences, no single option is universally better than another. The right choice comes down to your individual anatomy, treatment goals, and the recommendation of your treating dentist following a full clinical assessment.
What Factors Affect Which Option is Right for You?
The right implant option depends on a combination of clinical and personal factors. Your dentist will assess all of these during a consultation, but understanding them in advance can help you ask the right questions.
Bone quantity and bone quality
The amount and density of available bone are among the biggest factors in deciding how many implants should be used. This is why 3D imaging is such an important part of full-arch planning.
Patients with lower bone volume often suit All-on-4, while those with adequate bone volume may be candidates for All-on-6 or All-on-8.
Upper jaw vs. lower jaw
The upper jaw and lower jaw are different in shape and bone quality. In some cases, one arch may need a different approach from the other. A patient may not always need the same number of implants in both jaws. For example, the upper jaw may require more implants due to naturally softer bone density.
Bite force and grinding
If you clench or grind your teeth, or if you have a stronger bite, this may influence the treatment design. Heavier forces may make extra support or a different prosthetic design more appropriate. In these cases, All-on-6 or All-on-8 may be considered over All-on-4.
Prosthesis material and design
The material used for the final bridge matters. The choice between different prosthetic materials affects durability, appearance, weight, and long-term maintenance. The implants and the bridge should be planned together as one system. The number of implants chosen may also depend on the material and weight of the final bridge.
Treatment timeline
Some patients can receive temporary teeth on the same day as surgery, while others may need a more staged approach. If extractions, healing, or bone grafting are involved, treatment can take longer. The right timeline depends on the condition of your mouth and the complexity of the case.
What are the Benefits of Full-arch Implant Treatment?
A fixed full-arch bridge can dramatically improve stability, chewing ability, speech, comfort, and confidence. Compared with removable dentures, implant-supported restorations are far less likely to move around and are often preferred by patients who want a more secure solution.
Implants can also help support the jaw more effectively than traditional dentures, as implants help preserve the jawbone over time. When teeth are lost, the jawbone can begin to shrink through a process called resorption. Because implants are anchored into the bone, they provide stimulation that helps slow this process – something traditional dentures cannot do.
For many patients, full-arch treatment is not just about replacing missing teeth; it is about restoring function, confidence, and quality of life.
What are the risks or downsides?
Like any surgical treatment, full-arch implants come with risks. These can include infection, healing complications, implant failure, prosthetic wear or fracture, gum recession, and the need for ongoing maintenance. Some patients also need time to adjust to the feel of a full-arch bridge.
Should any of these complications occur, your dentist will reassess your treatment plan and advise on the appropriate course of action, which may include further procedures or adjustments to the prosthesis, thereby extending the treatment timeline.
Long-term success depends heavily on planning, home care, and professional maintenance. Smoking, untreated health conditions, poor oral hygiene, and excessive bite forces can all affect outcomes. Even after treatment is complete, regular reviews remain important.
Most patients are advised to attend check-up appointments every 6 to 12 months. These visits allow your dentist to assess the implants, clean areas that are difficult to reach at home, and identify any early signs of wear or complications before they progress.
Which Implant Option is Right for You?
There is no single best option across the board. All-on-4 is the most established full-arch solution and suits the majority of patients well. All-on-6 offers additional support where bone density, bite forces, or arch size make it a more appropriate fit. All-on-8 is reserved for more selective cases where the anatomy and treatment goals specifically call for it.
The right choice is determined by a thorough clinical assessment, not by the assumption that more implants means a better result.
At Radiant Smiles Perth, we believe full-arch treatment should feel personalised and well explained. If you are comparing All-on-4 vs. All-on-6 vs. All-on-8 and want honest guidance tailored to your smile, book your free consultation to understand your treatment options. We can assess your jaw with detailed imaging and help you choose the most suitable path forward.
Disclaimer: Any surgical or invasive procedure carries risks. Before proceeding, seek an opinion from an appropriately qualified health practitioner.
All-on-4 vs. All-on-6 All-on-8 FAQs
What is the main difference between All-on-4, All-on-6, and All-on-8?
The main difference is the number of implants used to support a full-arch bridge. Four, six, or eight implants can all support a fixed full-arch restoration, but the best choice depends on individual bone structure, bite forces, and the restorative plan.
Is All-on-4 enough for a full arch?
Yes, in many cases it is. All-on-4 is a well-established full-arch treatment concept and can provide excellent support when the implants are positioned correctly and the case is planned properly.
Does All-on-6 last longer than All-on-4?
Not automatically. While All-on-6 may offer more support in some cases, long-term success depends on much more than the number of implants. Planning, surgical technique, bridge design, hygiene, and follow-up care all play a major role.
Is All-on-8 the strongest option?
It offers the most support points, but that does not mean it is automatically the best option for every patient. All-on-8 is usually considered where the patient has sufficient bone across the full arch, a stronger bite or history of bruxism, or a larger arch span that benefits from additional support points.
Can I get teeth in one day?
Many patients can receive a temporary fixed bridge on the same day as the surgery if the implants are stable enough at placement. Your final bridge is usually fitted after the healing phase is complete.
How long does healing take?
Healing usually takes several months. Many full-arch cases involve a healing period of around three to six months before the final prosthesis is placed, although this varies from patient to patient.
How long do full-arch implants last?
The implants themselves can last many years with proper care, and potentially much longer. The bridge on top may need maintenance, repairs, or replacement over time, depending on wear and the material used.
Who is a candidate for All-on-4, All-on-6, or All-on-8?
Patients who are missing most or all of their teeth, have failing teeth, or are unhappy with dentures may be candidates. The best way to find out is with a full assessment, including imaging and a consultation.
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