Implant, bridge or denture: how to choose

When it comes to replacing a missing tooth, there is no solution that is superior in absolute terms. The right choice between an implant, a bridge and a removable prosthesis (the denture) depends on your clinical situation: the condition of the neighboring teeth, the volume of bone available, your general health and the maintenance each option requires. The most useful figure to know is that at ten years, the survival of an implant-supported crown and that of a bridge anchored to the neighboring teeth are of the same order of magnitude, around 89%, according to the systematic review by Pjetursson and colleagues published in Clinical Oral Implants Research in 2007. In other words, these three families of treatment address different problems, and the decision is built together with your practitioner, criterion by criterion, rather than from a commercial ranking.

This article offers a balanced comparison, with no prices and no hierarchy. Every clinical statement points to a verifiable source, and the benefits are presented alongside their limits and their contraindications, because nuance is precisely what makes an informed decision possible.

# Why replacing a missing tooth changes the bone picture

Before even comparing the options, it helps to understand what happens when a tooth is extracted and nothing takes its place. The bone that surrounded the root, the alveolar bone, is no longer stimulated and resorbs.

The systematic review by Tan and colleagues (Clinical Oral Implants Research, 2012) quantified this phenomenon on non-preserved human sites: the ridge loses on average close to 3.8 mm in width and 1.2 mm in height in the six months following the extraction. The loss is most marked in the first months, then slows down. It is not a sudden disappearance, but a gradual process that unfolds over months to years.

This resorption has two concrete consequences for the choice of treatment. First, the longer you wait, the more the available bone volume may become a limiting factor for an implant. Second, this remaining volume directly guides the decision: it determines whether an implant is feasible, sometimes after preparing the site. To go further on this point, you can read our article on solutions when there is not enough bone to place an implant.

# Implant, bridge or denture: what each solution involves

The three options are not three versions of the same thing. They rest on different principles.

# The dental implant

An implant is an artificial root, usually made of titanium, inserted into the jawbone. Once osseointegration is achieved, that is, once the bone has healed around the implant, a crown, a bridge or a prosthesis is attached to it. The main advantage is that this solution does not rely on the neighboring teeth and that it loads the bone, which contributes to maintaining it. The full process, from indications through to healing, is detailed on our page about the dental implant in Kénitra.

# The bridge

A conventional bridge replaces one or more teeth by resting on the adjacent teeth, known as abutments. These teeth have to be prepared so that they can receive the crowns supporting the intermediate element. It is a fixed solution, with no implant surgery, but it comes at a biological cost to the supporting teeth.

# The denture and the removable prosthesis

A removable prosthesis, partial or complete, rests on the gum and the underlying bone, sometimes with clasps on the remaining teeth. It is taken out for cleaning. It is the least invasive solution, but also the least stable, particularly in the case of a complete lower prosthesis.

# Bridge or implant: the neighboring-teeth criterion

This is often the criterion that settles the choice between a bridge and an implant when replacing a single tooth.

A conventional bridge requires the teeth bordering the gap to be prepared, even when they are perfectly healthy. According to Pjetursson and colleagues (2007), the most frequent complications of tooth-supported bridges are biological: caries and loss of pulp vitality in the abutment teeth. Preparing two intact teeth in order to replace one therefore carries a biological cost that has to be factored into the decision.

Two situations stand out:

• The neighboring teeth are healthy and intact. Preparing two teeth to place a bridge means permanently weakening teeth that are in good health. The implant, which leaves them untouched, offers an advantage in terms of preservation here.
• The neighboring teeth are already crowned, root-treated or heavily damaged. The biological cost of the bridge is then far lower, since those teeth would have needed a restoration in any case. The bridge becomes a logical option again.

When it comes to longevity, the figures call for moderation. Again according to Pjetursson and colleagues (2007), ten-year survival reaches around 89.2% for the conventional tooth-supported bridge and 89.4% for the single implant-supported crown. Neither solution lasts forever, and there is no guarantee of several decades. If the question of budget is on your mind, our article on what makes the cost of a dental implant vary explains the determining factors without quoting prices.

# Denture or implant: stability, chewing and comfort

For extensive or complete tooth loss, the comparison shifts toward function.

A complete denture chews markedly less well than natural teeth. An in vivo study by Sharma and colleagues (J Indian Prosthodont Soc, 2017) measured an average bite force of around 63 N with a conventional denture, compared with around 132 N with a prosthesis stabilized on two implants. The implant-supported prosthesis also required fewer chewing cycles to break down a food item. These values illustrate an order of magnitude, not a universal norm, but the trend is clear: stabilizing a prosthesis on implants distinctly improves chewing.

This is where an intermediate solution comes in, one too often forgotten in the denture-versus-implant debate: the removable prosthesis stabilized on implants, or overdenture. For a completely edentulous lower jaw, the McGill Consensus Statement (Gerodontology, 2002) and then the York Consensus Statement (British Dental Journal, 2009) proposed the prosthesis stabilized on two implants as the first choice of care. This is an expert consensus, and therefore a recommendation to be presented as such rather than as an absolute rule, but it offers a useful compromise between the comfort of a removable prosthesis and the hold provided by implants.

# Comparison table by clinical criterion

The table below sums up the differences without establishing any hierarchy. Each row corresponds to a criterion to be weighed according to your case.

# The general-health criterion: risk factors and false contraindications

General health shapes the choice, but it rarely locks it. Genuine risk factors need to be distinguished from received ideas.

The meta-analysis by Chen and colleagues (PLoS One, 2013) provides precise data. Smoking is associated with an increased risk of implant failure, with a relative risk of 1.92. Radiotherapy to the oral region is also a risk factor. Diabetes, on the other hand, was not associated there with a significant excess risk when the analysis is conducted overall, and neither was osteoporosis. Well-controlled diabetes is therefore not a contraindication to an implant.

The right vocabulary is that of risk factors to be assessed and prepared for, rather than firm contraindications:

• Smoking increases the risk of failure and warrants support, ideally quitting before the procedure.
• Diabetes has to be well controlled, but it does not rule out an implant when it is managed.
• Medical history and certain treatments are discussed case by case with the practitioner and the treating physician.

When an implant is being considered but bone volume is insufficient, reconstruction techniques exist. Depending on the location, this may involve a bone graft before an implant or, in the posterior upper jaw, a sinus lift. These procedures broaden the indications for implants without making them the only possible answer.

# Maintenance: a criterion that cuts both ways

Implants are sometimes presented as a maintenance-free solution. That is not accurate. Every option calls for maintenance, and the implant has its own complications.

The review by Pjetursson and colleagues (2007) shows that at five years, around 38.7% of patients with an implant-supported bridge present at least one complication, compared with 15.7% of patients with a conventional tooth-supported bridge; these rates are calculated per patient, not per prosthesis. The 2012 review (Clinical Oral Implants Research) specifies that only 66.4% of patients with implant-supported prostheses were free of any complication at five years, the most frequent being technical complications of the veneering material, screw loosening and problems affecting the peri-implant tissues.

This does not disqualify the implant, but it does call for two honest qualifications:

• The implant procedure takes place under local anesthesia and is generally well tolerated. Describing it as painless or risk-free would be misleading.
• Inflammation of the tissues around the implant, peri-implantitis, can occur and requires follow-up. The word rejection is inaccurate: we speak of failure of osseointegration or of peri-implantitis, an inflammatory disease redefined at the 2017 World Workshop. The signs to watch for are described in our article on implant failure and peri-implantitis.

On the removable prosthesis side, maintenance involves daily care and the readjustments made necessary as the ridge changes over time. The bridge, for its part, calls for rigorous hygiene under the intermediate element in order to protect the abutment teeth.

# How the choice is actually made

In practice, the decision follows a clinical logic, not a ranking. A few useful benchmarks:

• A single missing tooth, healthy neighboring teeth: the implant preserves the adjacent teeth, which is often a strong argument.
• A missing tooth, neighboring teeth already restored: the bridge becomes relevant, because its biological cost is reduced.
• Insufficient bone for an immediate implant: a graft or a sinus lift is assessed, or another solution is considered.
• Complete tooth loss, with stability as the goal: the prosthesis stabilized on implants offers a compromise between comfort and hold.
• Risk factors or a particular medical context: the choice is built after assessment, with no automatic exclusion.

The work-up rests on a clinical examination and appropriate imaging. At the practice, three-dimensional Cone Beam imaging makes it possible to gauge precisely the bone volume available, which is decisive in telling apart a site favorable to an implant from a site that needs prior preparation. It is this analysis, and not a preference on principle, that points toward one or another of the three families of treatment.

# What to remember

Implant, bridge and denture cannot be ranked from best to worst. They address distinct situations, each with its own benefits and limits. At ten years, the survival of the implant-supported crown and that of the tooth-supported bridge are comparable, around 89% according to Pjetursson and colleagues (2007). The choice is built on verifiable criteria: the condition of the neighboring teeth, bone volume, general health and the maintenance you are willing to take on. A consultation makes it possible to weigh these criteria for your case and to decide with full understanding.