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What is a precision-attachment denture?

Because no clasp shows, it is taken for a fixed solution; in fact it is a denture that comes out

Most patients hear this name for the first time at the clinic, and it is usually explained as 'a denture without clasps'. That is true but incomplete. On this page we have written down how it stays in place, why it is mistaken for a fixed solution, what it does to your remaining teeth and what happens to the attachments over time, because these three things make the most difference when you decide.

Short answer

A precision-attachment denture is a system in which a removable denture is joined to the remaining teeth by hidden attachments instead of visible metal clasps. The remaining teeth are prepared and crowned; one half of the attachment sits inside the crown and the other half inside the denture, and the two lock together. The result looks far better than a denture with clasps, but the denture still comes out and the load still falls on the remaining teeth and the gum.

Is it fixed?
No, it comes out for cleaning
How it stays in
With hidden attachments inside the crowns
The price
Sound teeth are prepared, and take extra load
Maintenance
The attachments wear and have to be replaced

Medically reviewed by Bilge Ilgın, Dentist · Implantology

How it works

A conventional removable partial denture holds on to the remaining teeth with metal clasps. A clasp does its job, but it shows when you smile, and that is what patients complain about most. A precision-attachment denture does the same job with a connection that cannot be seen: one half of the attachment is hidden inside the crown made for the remaining tooth, and the other half is set into the body of the denture. When the denture is put in, the two halves lock together and no metal shows from the outside.

This is a genuine gain. The appearance is noticeably better and retention is stronger than with clasps, because the connection sits inside the tooth rather than hooking on to the outside of it. It is a well-established method, used for a long time, and it works well in the right case. The problem is not with the method but with how it is described.

Because this denture is not fixed. As there is no visible clasp, patients often take it for a fixed solution, and sometimes it is described that way as well. In reality it is taken out every day for cleaning, taken out at night, and in most designs the palatal section is kept. This is what causes most of the misunderstanding when you are deciding; a patient expecting fixed teeth is disappointed when they learn on the first day that the denture has to come out.

The second question is what happens to the remaining teeth. To carry half of the attachment, those teeth have to be prepared and crowned, and that cannot be undone. Part of the chewing load carried by the denture also falls on those teeth. Adding a new load to teeth that are already few in number, and may have been through gum disease, can shorten their life.

The third is mechanical. Attachments are moving parts, and every moving part wears. In time the denture loosens and the worn part of the attachment has to be replaced. That is not a fault; it is the normal maintenance of the system. But when it is not explained at the outset, the patient takes it for a breakdown. It also matters that which system was used is put on record, otherwise finding spare parts years later becomes a problem.

The fourth is the thing no removable denture can solve: the bone shrinks. Because the bone under the gum the denture sits on carries no load, it carries on shrinking. Over the years the denture stops fitting, its fitting surface has to be relined and in the end it has to be replaced. However good the attachments are, the ground beneath them is changing.

Who it suits and who it does not

This denture works well in the right case. The breakdown below shows what that case is.

The tooth can be saved

  • People whose remaining teeth are sound and sufficient in numberThe teeth that will carry the attachment must have sound roots and enough bone around them. When that condition is met, the system can work without trouble for years.
  • People who do not want a clasp to showThe gain in appearance is real, and it is the whole reason this denture exists. For a patient with a clasp showing at the front, making the change increases satisfaction noticeably.
  • Patients who do not want surgery or cannot have itFor systemic conditions that rule out implants, or for patients who will not accept surgery, it is a more comfortable halfway solution than a denture with clasps.
  • People whose budget will not stretch to a fixed solutionIt costs less than a fixed bridge on implants. But replacement and maintaining the attachments go into the total; the decision has to be thought through on a yearly cost basis.

Saving it is unlikely to hold

  • Patients whose remaining teeth are looseLoading an attachment onto a tooth that has lost its supporting bone speeds up the loss of that tooth. When a supporting tooth is lost, the denture becomes unusable as well.
  • People expecting fixed teethThis denture comes out. For a patient who wants fixed teeth, the right answer is a bridge on implants; knowing that at the outset prevents disappointment.
  • People who are troubled by having the palate coveredIn most designs the palatal section is kept, and the sense of taste and temperature is affected by it. A patient waiting for the palate to be left uncovered will not find what they are looking for in this solution.
  • People with limited manual dexterityPutting in and taking out a denture with attachments calls for a certain delicacy of hand. Patients with a tremor, a joint problem or loss of vision can find it difficult.

How it is done

It is a job spread over several appointments; it takes longer than a denture with clasps because the supporting teeth are prepared as well.

  1. 1

    Assessing the remaining teeth

    Which teeth can carry an attachment? Are their roots sound, and how much bone is there around them? A plan started without this assessment ends within a few years with the loss of a supporting tooth.

  2. 2

    Treatment beforehand

    If the supporting teeth need work for decay, root canal treatment or gum treatment, that is completed first. If this step is skipped, a problem progressing under a crown goes unnoticed.

  3. 3

    Preparing the teeth and taking impressions

    The supporting teeth are prepared for the crowns that will carry half of each attachment. This is a step that cannot be undone, and this is the moment the decision is made.

  4. 4

    Making the crowns and the denture

    The crowns are made together with their attachments, and the denture is made to fit onto them. The two have to fit each other exactly; this is the part where the laboratory work is decisive.

  5. 5

    Fitting and getting used to it

    You are shown how to put it in and take it out, and pressure spots are adjusted in the first few days. These adjustments are not finished in one appointment; several check-ups are needed.

  6. 6

    Regular maintenance

    The attachments are replaced as they wear, and the denture is relined as the bone shrinks. These two jobs determine how long the system lasts, and they should be put in the diary from the start.

A side-by-side comparison

The other routes discussed for the same mouth, and where they part ways.

01

A partial denture with clasps

It does the same job with visible metal clasps. It costs less and does not call for the supporting teeth to be prepared. The price is the appearance and, usually, weaker retention.

02

An implant-retained denture

It takes its retention not from the remaining teeth but from two to four implants. No load falls on the remaining teeth, and the bone where the implants sit goes on carrying load. It is still a denture that comes out.

03

A fixed bridge on implants

It does not come out, the palate is not covered and taste comes back. The surgery and the cost are greater; this is the solution a patient who wants fixed teeth is looking for.

04

A bridge on your own teeth

If the gap is short and there is a sound tooth on either side, it is a fixed solution. It cannot be used for long gaps, or where there is no support at the back.

05

A full removable denture

This comes up when the remaining teeth cannot be saved. It is the least expensive route; the palate is covered completely and bone resorption speeds up.

What you need to know

None of the points below makes this a bad denture; they let you make the decision knowing what is involved.

The supporting teeth are prepared in a way that cannot be undone

Enamel is removed for the crowns. From then on those teeth have to be protected by a crown, and decay developing at the edge of a crown becomes harder to spot.

If a supporting tooth is lost, the denture becomes unusable

The attachment goes with the tooth it stands on. This is the most fragile point of the system, and it is exactly why the supporting teeth have to be sound from the outset.

The attachments wear

Moving parts loosen over time and have to be replaced. This is normal maintenance, but if which system was used has not been put on record, finding spare parts becomes a problem.

The bone carries on shrinking

Because the bone in the area the denture sits on carries no load, it shrinks. Over the years the denture stops fitting; its fitting surface has to be relined and in the end it has to be replaced.

Getting used to wearing it

The first week is decisive; the adjustments made in that period decide whether the denture will be worn at all.

  1. The first few days

    A feeling of fullness in the mouth, more saliva and some sounds coming out differently are all normal. Finding it awkward to put in and take out is normal too; your hands learn. If there is a spot under pressure, it should be adjusted without delay.

  2. The first week

    The spots where sores form are adjusted. Taking the denture out and leaving it out because of a painful area is the most common mistake; when it is shown to the dentist, most are sorted out in a few minutes.

  3. The first few months

    Chewing opens up step by step. During this period the supporting teeth are watched separately; how they are coping with the load of the attachment shows early on.

  4. The long term

    At least one check-up a year: wear on the attachments, the fit of the denture and the health of the supporting teeth. As the bone shrinks the fitting surface has to be relined; this is the procedure that extends the life of the denture.

Message us right away if

  • Your denture has become loose. It shows that the attachments have worn. Replacing them is a small procedure; if it is put off, the denture starts to move and strains the supporting teeth.
  • A sore that will not heal. A spot under pressure has to be adjusted. A sore lasting longer than two weeks means a cause unconnected with the denture has to be looked into as well.
  • Pain or movement in one of the supporting teeth. The most fragile point of the system. If that tooth is lost the denture becomes unusable; stepping in early can save the tooth.
  • You have started to need denture adhesive. A precision-attachment denture should not need adhesive. If you have come to need it, either the attachments have worn or the bone underneath has shrunk; both need to be assessed.

What determines the cost

More expensive than a denture with clasps, cheaper than a fixed bridge on implants. But the real difference is not in the first payment; it is in the maintenance spread over the years.

How many supporting teeth are prepared
Each supporting tooth needs a crown and an attachment. The more there are, the greater both the materials and the laboratory work.
Treatment of the supporting teeth beforehand
Root canal treatment or gum treatment, if needed, are separate items. An X-ray shows this at the outset, and it should appear on the quote.
The attachment system and spare parts
The name of the system used should be put on record. In a system whose spare parts cannot be obtained, one worn attachment can turn into replacing the whole denture.
How often relining and replacement are needed
As the bone shrinks the fitting surface is relined, and in time the denture is replaced. This is the item that really determines the total cost; you need to think of the price divided by the years.

Frequently asked questions

Is a precision-attachment denture fixed?

No. Because it has no visible metal clasp it is taken for a fixed solution, but it is a denture that comes out: it is taken out for cleaning and at night. The solution a patient who wants fixed teeth is looking for is a bridge on implants.

How does it differ from a denture with clasps?

In the way it holds on and in how it looks. A clasp hooks on to the outside of the tooth and shows; a precision attachment is hidden inside the crown on top of the tooth. Retention is usually stronger. In return, the supporting teeth have to be prepared and crowned, and the cost goes up.

Do I have to have my sound teeth prepared?

Yes, because half of the attachment sits inside the crown on those teeth. This is a step that cannot be undone. If you do not want them prepared, a denture with clasps or a solution that takes its retention from implants should be discussed.

How long do the attachments last?

Because they are moving parts they wear, and in time they have to be replaced. How long depends on how they are used, on the bite and on the system; it would be wrong to give an exact figure. What matters is that which system was used is put on record, otherwise finding spare parts becomes a problem.

Will my palate be covered?

In most designs the palatal section is kept, so the sense of taste and temperature is affected by it. Depending on the design this section can be made smaller, but removing it altogether is usually not possible. Leaving the palate completely uncovered is possible with fixed solutions.

Will it stop my bone shrinking?

No. Because the bone in the area the denture sits on carries no load, it carries on shrinking and in time the denture stops fitting. The fitting surface has to be relined and in the end the denture has to be replaced. The only solution that passes load into the bone is an implant.

Can I move to implants later on?

You can, but waiting has its price: because the bone in the area the denture sits on carries on shrinking, the conditions for the next plan get harder. If you are considering a precision-attachment denture now, it is worth discussing today's implant options alongside it.

Sources

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