Last updated: August 2026
Replacing one missing tooth is a fairly contained decision. Replacing a whole arch is a different conversation, and the terminology people arrive with does not always help. All-on-4, overdenture, full denture, fixed bridge, implant-supported. Some of these describe the same thing from different angles.
There are three broad approaches. Understanding what separates them makes the choice much easier.
Before the options, one piece of background that explains a lot of what follows.
Bone responds to load. A tooth root transmits force into the jawbone every time you chew, and the bone maintains itself in response. Remove the root and that stimulus stops. The bone gradually reduces in volume, quickly at first and then more slowly.
This is why a denture that fitted well five years ago can become loose without the denture having changed shape at all. The ridge it sits on has. It also explains why the amount of bone available becomes the deciding factor in what is possible later, and why the question of timing comes up so often.
A removable acrylic denture resting on the gum ridge, held by suction and the shape of the tissues.
It remains the most widely used solution, and for good reason. There is no surgery. It costs the least of the three. It can be made relatively quickly, adjusted as things change, and relined as the ridge alters. For someone whose health, circumstances or budget rule out surgery, this is not a compromise so much as the appropriate answer.
Its limits are also well known. Lower dentures are harder to stabilise than upper ones because there is less ridge and the tongue is working against them. Chewing efficiency is lower than with fixed teeth. And because the denture rests on the ridge rather than loading the bone through roots, the ridge continues to reduce underneath it, which is why relines become necessary over time.
Our dentures page covers types and the process, and there is more on DVA funding for dentures for cardholders.
A denture that clips onto a small number of implants. It is still removed for cleaning, but it no longer relies on suction alone.
Two implants in the lower jaw make a substantial difference to how secure a lower denture feels, which is where most complaints about conventional dentures come from. Four gives more again. The denture attaches with press-studs or a bar, and unclips for cleaning.
This option sits between the other two on nearly every measure. Less surgery and lower cost than a fixed bridge, considerably more stability than a conventional denture. It also puts some load back into the bone at the implant sites.
For DVA cardholders this is the arrangement DVA funds, and the rules are specific: three implants to attach a full lower denture, or two to attach a partial upper. Details are on our DVA dentist page.
A bridge of teeth attached to implants, which stays in the mouth. This is what All-on-4 describes: a fixed arch supported by four implants, with the back two angled so they engage available bone and often avoid grafting. Some cases use more than four, depending on bone and bite.
It is the closest of the three to fixed teeth. Nothing is removed, chewing efficiency is highest, and there is no palate covering the roof of the mouth, which matters more to taste and comfort than people expect.
Two practical points get less airtime than they should. The first is cleaning. A fixed bridge cannot be taken out and scrubbed, so cleaning happens around and underneath it with interdental brushes, floss threaders or a water flosser, plus regular professional maintenance. Anyone with limited dexterity should think about this carefully. The second is that it asks the most of the bone, so imaging comes first and grafting is sometimes still needed despite the angled approach.
Background on the implant components themselves is in why implant quotes vary so much, and the All-on-4 page covers the treatment.
| Full denture | Implant overdenture | Fixed bridge | |
|---|---|---|---|
| Removed for cleaning | Yes | Yes | No |
| Surgery required | None | Two to four implants | Four or more implants |
| Stability | Lowest | Moderate to high | Highest |
| Covers the palate (upper) | Usually | Often reduced | No |
| Slows ridge reduction | No | At implant sites | At implant sites |
| Daily cleaning difficulty | Easiest | Moderate | Most demanding |
| Relative cost | Lowest | Middle | Highest |
In practice the decision turns on a handful of things, and cost is only one of them:
Everything above turns on how much bone is present, and that is measured rather than guessed. A cone beam CT scan shows width as well as height, which ordinary dental X-rays cannot. Ours is on site, so there is no external referral and no separate trip to a radiology clinic. For a decision this size, having the scan and the conversation in the same appointment tends to be worth more than the convenience alone suggests.
Two local factors shape which option people land on. DVA cardholders are well represented in Croydon, and DVA funds implants to attach a denture under specific rules rather than funding a fixed bridge, which narrows the field before cost is even discussed. And with median weekly household income here at $1,615, the realistic comparison for many families is between a conventional denture and an overdenture, not between an overdenture and a full fixed arch.
More than one in ten Croydon residents is aged 75 or over, and another 6,516 sit in the 45 to 64 band. If someone is driving a parent to appointments, Saturdays are usually easier than weekdays, and there is parking on site rather than a walk from the Main Street strip.
An assessment covers the state of any remaining teeth and gums, imaging to see how much bone there is, and a conversation about what you want and what you can look after. That produces a shortlist rather than a single recommendation, which is generally how this decision should be made.
Call (03) 9725 8040 or book online. We are on Wicklow Ave with parking on site, which is worth knowing if someone is driving you in, and we are open Saturdays. Related pages: All-on-4, dental implants, dentures, and missing teeth.
DVA funding rules described here are drawn from the Department of Veterans' Affairs and were last checked on 9 August 2026. This article is general information, not personal dental advice. Suitability for any option depends on examination and imaging of your individual case.