What are mini implant overdentures for a loose lower denture?

How a lower denture can clip onto mini implants, and who this suits.

Dr Bill Kalis — Saturday 14 November 2026

A mini implant overdenture is a lower denture that clips onto four small implants placed in the front of your lower jaw, so it stays in place when you eat, speak and laugh. The implants are placed in one appointment of 60 minutes or less, using a keyhole technique with no cutting of the gum and no stitches. You go home that day without your lower denture, because it goes to our laboratory overnight to be properly processed. It is fitted the next day.

I am Dr Bill Kalis, principal dentist at Padstow Dental in Padstow, Sydney. A loose lower denture is one of the most common frustrations I hear about. Mini implants are an efficient, minimally invasive and well-established way to deal with it.

Why do lower dentures become loose?

Lower dentures become loose because the jawbone shrinks after teeth are removed, leaving a low, narrow ridge with little to grip. An upper denture has the palate to hold it by suction. A lower denture has only a thin horseshoe of gum, and your tongue and cheeks lift it as you talk and chew. Relining helps for a while, and adhesive is a daily workaround, but neither fixes the cause.

What are mini implants?

Mini implants are narrow titanium implants, slimmer than conventional implants, with a small ball on top. Because they are narrow, they can often be placed in a lower jaw that has become too thin for conventional implants, without bone grafting. This means they can be an option for people with very little bone, and for people who have been told they are not suitable for conventional implants.

How does a mini implant overdenture work?

Four mini implants are placed in the front part of the lower jaw. Small housings are built into the underside of your denture. The denture snaps down over the ball tops and is held firmly, and you lift it off yourself to clean.

What does treatment involve?

1. Assessment and planning. An examination, a 3D scan (CBCT) and a digital scan, so the position of each implant is planned in advance

2. Implant placement. The four mini implants are placed in one appointment of 60 minutes or less, under local anaesthetic. It is a keyhole procedure: the implants are placed through the gum, with no cutting and no stitches

3. Impression. At the same appointment, we take an impression so your denture can be relined to fit precisely over the implants. Your lower denture then goes to the laboratory, so you go home with the mini implants in place and no lower denture for the first day. If you have an old denture, we can fit that temporarily to get you by. This also lets the area settle, and we recommend a soft diet to begin with

4. Fitting the next day. Your denture is relined in the laboratory overnight with the housings built in, and fitted the following day

5. Review. A check soon afterwards, then regular reviews

Why is the denture fitted the next day?

Because the result lasts longer and is easier to keep clean. Your denture goes to the laboratory for a heat-cured reline, with the housings set into it as part of that process, so it seats evenly on all four implants.

The alternative is to fit the housings in the chair on the same day, using an injectable acrylic. We used to do it that way. In our experience, that material tends to trap bacteria around the implants, and a laboratory reline holds up better over the long term. This is the reason you go home without your lower denture on the first day. One day without it is a small trade for a better result.

How do the options for a lower denture compare?

• Ordinary lower denture: held by the ridge and muscle control. No surgery. The least stable when eating.

• Mini implant overdenture: clips onto four narrow implants. A keyhole procedure of 60 minutes or less that suits a thin ridge. Much more stable, and you take it out yourself.

• Overdenture on conventional implants: clips onto wider implants. Needs more bone and a longer healing time before the denture is attached.

• Fixed teeth on implants: screwed in place and removed only by the dentist. More involved surgery and a higher cost.

Who do mini implant overdentures suit?

They suit people with a loose lower denture, a thin lower ridge or very little bone, people who are not suitable for conventional implants, and people who prefer a smaller procedure. They are often chosen by older patients who want better stability without more involved surgery. Suitability is confirmed at your assessment and on your 3D scan.

Are there limits?

Yes. Mini implants are narrower than conventional implants, so they are used in the lower jaw to hold a removable denture, not to support fixed teeth. They are less suited to people who clench or grind heavily. Like all implants, they need daily cleaning, and outcomes vary between patients.

How much do mini implant overdentures cost?

Stabilising a lower denture with four mini implants costs about $6,000 to $7,000, which is similar to the cost of a single conventional implant. The final fee is confirmed after your assessment, 3D scan and digital planning.

Most people have this procedure under local anaesthetic alone. IV sedation is available as an optional extra, at an additional cost.

Fees are a guide only. Treatment costs are confirmed after your consultation.

What maintenance do they need?

The retaining rings inside the housings wear with use and are replaced from time to time in a short visit. Clean around each implant every day with a soft brush, take the denture out at night, and attend your regular reviews.

Common questions about mini implant overdentures

How long does the procedure take?

60 minutes or less, in one appointment. Your relined denture is fitted the next day.

Will I be without my lower denture?

For the first day, yes. Your denture goes to the laboratory to be relined properly and is fitted the next day. If you have an old denture, we can fit that temporarily to get you by. We recommend a soft diet to begin with.

Do I need IV sedation?

Usually not. The procedure is minimally invasive, and most people have it under local anaesthetic alone. IV sedation is an optional extra if you would prefer it, at an additional cost.

Will I need stitches?

No. The implants are placed through the gum using a keyhole technique, with no cutting and no stitches.

Is the procedure painful?

The area is fully numbed before we begin. Because the procedure is minimally invasive, most people have it under local anaesthetic alone. Most people manage afterwards with simple pain relief for a few days.

How many mini implants do I need?

Four for a lower denture.

Can my existing denture be used?

Often, yes, if it is in good condition. It is relined in the laboratory to fit over the implants. A worn or cracked denture is better replaced.

Am I too old?

Age alone is not a barrier. General health and bone matter more.

Will my health fund contribute?

Extras cover with major dental may pay a rebate, up to your annual limit.

Does your lower denture move when you eat or speak?

Book an assessment on 02 9773 4775. You can also read about dental implants at Padstow Dental and how much dental implants cost.

Any surgical or invasive procedure carries risks. Before proceeding, you should seek a second opinion from an appropriately qualified health practitioner.

Written by Dr Bill Kalis, Principal Dentist at Padstow Dental. BDS (Hons), University of Sydney, 1994. Graduate Certificate in Clinical Dentistry, University of Adelaide, 2007. Past State and Federal President of the Australian Society of Implant Dentistry. Dr Kalis is a general dentist with a focus on implant, surgical and IV sedation dentistry.