All on 4 Dental Implants
Am i a Candidate for All-on-4?
One of the most common questions we hear at The Smile Designer in South Preston is: Am I actually a candidate for All-on-4 dental implants? It’s a fair question — and for patients researching fixed implant bridges in Melbourne’s inner north suburbs of Preston, Northcote, Thornbury, Brunswick, Coburg, Fitzroy, and Carlton, the honest answer is that a larger proportion of patients are suitable than many people assume.
The All-on-4 technique was specifically developed to work with reduced bone levels — which means many patients who were previously told they couldn’t have implants may now be suitable. That said, candidacy is always individual, and there are health and anatomy factors that genuinely affect whether All-on-4 is appropriate and what any preparatory treatment might involve.
This article outlines the key factors we assess when evaluating a patient for full-arch fixed implant treatment. For broader context, see our guides on All-on-4 in Melbourne and what full-arch implant treatment costs.
Who Is All-on-4 For? Understanding Full-Arch Implant Candidacy
All-on-4 is a full-arch implant solution — it replaces all of the teeth in the upper jaw, lower jaw, or both with a fixed, non-removable bridge. It is typically considered for patients who are missing most or all of their teeth in one or both arches, have multiple heavily decayed or failing teeth that are not restorable, currently wear conventional dentures and want a fixed alternative, or have experienced significant tooth loss due to decay, gum disease, trauma, or wear.
6 Key Factors That Determine All-on-4 Candidacy
1. Bone Volume and Density
This is the most clinically significant factor. Dental implants require sufficient bone in the jaw to integrate with — and after tooth loss, the jawbone gradually resorbs without the stimulation that tooth roots once provided. The longer teeth have been absent, the more bone is typically lost.
One key advantage of All-on-4 is that its angled posterior implants are designed to maximise the use of available bone in the front and mid-sections of the jaw, where bone is typically better preserved. This allows many patients with significant posterior bone loss — who would need bone grafting for a conventional approach — to proceed without grafting. Bone density is assessed via 3D CBCT imaging at the planning stage.
2. Gum Health
Active gum disease (periodontitis) needs to be addressed before implant surgery can proceed. Bacterial infection in the gum tissue increases the risk of peri-implantitis — infection around the implant — which can compromise osseointegration. If gum disease is present, it is treated first. This does not disqualify a patient from All-on-4; it is simply managed as part of the preparation process.
3. Overall General Health
All-on-4 is a significant surgical procedure and your general health affects both surgical risk and healing. We review full medical history at consultation. Some specific health factors commonly raised by patients include:
- Diabetes: Well-controlled diabetes is not a contraindication to implant treatment. Poorly controlled diabetes impairs healing and immune response. If your HbA1c is well managed, you may still be a good candidate — this is discussed at your consultation.
- Osteoporosis: Osteoporosis itself does not prevent implant treatment, but bisphosphonate medications used to treat it can affect bone remodelling. If you take bisphosphonates (such as alendronate or zoledronic acid), this must be disclosed and discussed with your prescribing physician.
- Autoimmune conditions: Many patients with autoimmune conditions are still suitable candidates depending on their specific situation and disease management. This is assessed individually.
- Cardiovascular conditions: Most patients with well-managed cardiovascular conditions can proceed. Specific cardiac conditions or recent cardiac events may require medical clearance.
4. Smoking
Smoking is one of the most significant modifiable risk factors for implant complications. It impairs blood flow to healing tissues, reduces immune response, and is associated with significantly higher rates of peri-implantitis and implant failure compared to non-smokers. Smoking is not an automatic disqualification, but the risks are substantially higher. Most providers recommend stopping at least two weeks before surgery and for a minimum of two months after, ideally permanently. This is a conversation worth having honestly at your consultation.
5. Age
There is no upper age limit for All-on-4 — the procedure is regularly performed in patients in their seventies and eighties, and general health and bone quality are far more relevant than age alone. There is, however, a lower age limit: implants should not be placed until the jawbone has finished growing, typically in the late teens.
6. Bite and Jaw Relationship
The relationship between your upper and lower jaws — including the space available between them — affects prosthetic design. All-on-4 prostheses require a minimum amount of vertical space to be structurally sound. Where teeth have been missing for a long time, bite collapse can occur. This is assessed at the planning stage, and in some cases preparatory treatment is needed to establish the correct jaw relationship before implants are placed.
Do I Need Bone Grafting Before All-on-4?
Not necessarily — and for many patients, this is the good news. The angulated implant design means patients with moderate posterior bone loss often do not require grafting, because the implants avoid the areas where bone is most deficient. However, some patients do require preparatory bone grafting — typically where bone loss is severe across multiple sites, or where the sinus has dropped significantly in the upper jaw. Where grafting is required, it adds a separate healing phase of approximately four to six months. We identify this at consultation, with 3D imaging, before you commit to any treatment.
All-on-4 Candidacy Summary
| Factor | Likely Suitable | May Need Further Assessment or Preparation |
|---|---|---|
| Bone volume | Adequate anterior and mid-jaw bone | Severe bone loss — may require grafting |
| Gum health | Healthy or treated gums | Active periodontitis — treat first |
| Smoking | Non-smoker or committed to stopping | Current smoker — higher risk; discuss at consultation |
| Diabetes | Well-controlled HbA1c | Poorly controlled — stabilise first |
| Bisphosphonate medications | Not taking bisphosphonates | Taking bisphosphonates — specialist review required |
| Age | Skeletally mature (late teens+) | Still growing — wait until maturity |
| General health | No significant systemic conditions or well-managed | Complex medical history — individual assessment |
What If I Have Been Told I Am Not a Candidate Elsewhere?
It is worth knowing that the criteria for All-on-4 candidacy have broadened significantly as the technique and supporting technologies have developed. Some patients who were told years ago that implants were not possible due to bone loss may find that today’s planning tools and surgical techniques make treatment viable where it previously was not. A second opinion with updated 3D CBCT imaging is always worthwhile if you received a previous assessment more than two or three years ago.
Serving Patients Across Melbourne’s Inner North
Patients from across Melbourne’s inner north come to The Smile Designer in South Preston for All-on-4 implant consultations, including from Preston, Northcote, Thornbury, Brunswick, Brunswick East, Coburg, Coburg North, Fitzroy, Fitzroy North, Carlton, Parkville, Reservoir, Heidelberg, Darebin, Alphington, Fairfield, and Bundoora. Our practice is easily accessible by car — with street parking on High Street — and by train from Preston Station.
Frequently Asked Questions: Am I a Candidate for All-on-4 Implants?
Can I have All-on-4 if I have worn dentures for many years?
Yes, in many cases. Long-term denture wear does lead to progressive bone resorption — however, All-on-4’s design specifically accounts for this. Many long-term denture wearers are suitable candidates once a 3D assessment of their remaining bone is completed. The longer you wait, the more bone is lost — so earlier assessment is generally better.
What if I have had extractions recently?
Recent extractions typically mean some healing time is needed before implants can be placed — usually three to six months depending on the number and location of extractions. In some cases, implants can be placed at the same time as extractions (immediate placement), but this depends on the specific clinical situation assessed on the day. This is something we assess individually at consultation.
I have high blood pressure — am I still a candidate?
Well-controlled hypertension is generally not a contraindication to implant surgery. Uncontrolled high blood pressure can increase surgical risk, and we may request medical clearance or recommend deferring treatment until blood pressure is stable. This is assessed at consultation during your medical history review.
Does having missing teeth for a long time affect my candidacy?
It affects the complexity of treatment, not necessarily your eligibility. Long-term tooth loss leads to more bone resorption, which may mean grafting is required for some implant sites — or it may mean All-on-4’s angled design is used to work around the bone deficiency. The only way to know is through a 3D CBCT scan, which gives us a precise picture of your current bone levels.
How do I find out if I’m a candidate for All-on-4 near Preston, Melbourne?
Book a consultation at The Smile Designer, 118–120 High Street, South Preston. We serve patients from across Melbourne’s inner north including Northcote, Thornbury, Brunswick, Coburg, Fitzroy, Carlton, Reservoir, and Heidelberg. Our consultations include 3D imaging where indicated, a full medical review, and a clear explanation of your options. Call 03 9089 7574 or book online.
Find Out If You’re a Candidate — Book at The Smile Designer
The only reliable way to know whether All-on-4 is right for you is through a proper clinical assessment with 3D imaging. At The Smile Designer, our implant consultations include a full examination and imaging review, a clear explanation of what we find, and an honest discussion of your options — including realistic timelines and costs. While you’re preparing, you may find it helpful to read about the full implant treatment timeline, what recovery involves, and how All-on-4 compares to All-on-6.
Call us on 03 9089 7574 or book online.
118–120 High Street, South Preston VIC 3072
There are risks and benefits to all dental treatments. The content on this page is intended for general educational purposes and does not constitute individual medical or dental advice. Treatment outcomes, timelines, and suitability will vary between individuals. For a full list of treatment risks, please visit our Treatment Risks page.
What Happens at an All-on-4 Candidacy Assessment?
Many patients arrive at their first consultation uncertain about what the process actually involves — and the assessment itself can feel daunting if you don’t know what to expect. At The Smile Designer in South Preston, an All-on-4 candidacy consultation is structured to give you clear, specific information about your situation — not a generic overview.
The appointment typically includes a full clinical examination of your teeth, gums, and bite relationship. Where indicated, we take 3D CBCT imaging — a low-dose scan that produces a three-dimensional view of your jawbone, allowing us to measure bone height, width, and density at every site where an implant might be placed. We also take a full medical history to identify any health factors that could affect surgery or healing, discuss your goals and expectations for the outcome, and walk you through the options that are clinically appropriate for your specific anatomy.
By the end of the consultation, you should have a clear answer to the question: am I a candidate for All-on-4? And if so, what does my specific treatment involve — including any preparatory work, the number of implants recommended, the prosthetic design, and a realistic timeline and cost. You are under no obligation to proceed at the consultation stage. The purpose is to give you the information you need to make a well-informed decision in your own time.
All-on-4 Candidacy Across Melbourne’s Inner North
Patients presenting for All-on-4 candidacy assessments at The Smile Designer come from a wide range of backgrounds and situations. Some have worn dentures for many years and want a fixed alternative. Some have a full mouth of failing teeth and are looking for a comprehensive solution. Some have had previous dental treatment that has not lasted and want a more definitive outcome. Some are simply in the early stages of research and want to understand their options before making any decision.
We welcome patients from across Melbourne’s inner north for these consultations — including from Preston, Northcote, Thornbury, Brunswick, Brunswick East, Coburg, Coburg North, Fitzroy, Fitzroy North, Carlton, Parkville, Reservoir, Heidelberg, Darebin, Alphington, Fairfield, and Bundoora. If you are researching All-on-4 dental implants in Melbourne’s inner north and are not sure whether you qualify, the best next step is a consultation with 3D imaging. There is no way to know your candidacy accurately from a website — anatomy varies too much between individuals for any general guidance to be reliable for your specific situation.
For further information on dental implants, the Australian Dental Association provides general consumer guidance on implant treatment.
