The Complete Guide to Deciding How to Replace Missing Teeth: a coordinate map of the three routes, the boundaries of the evidence, and the logic of what costs are made of

The Complete Guide to Deciding How to Replace Missing Teeth: a coordinate map of the three routes, the boundaries of the evidence, and the logic of what costs are made of

TL;DR

Missing teeth may be replaced by implants, bridges or removable dentures; the literature groups its studies by the pattern of tooth loss, so the figures cannot be carried across settings [F16]. In older adults the shortened dental arch is, on limited evidence, an alternative to conventional reconstruction [F4].

Scope: This article is general oral-health education based on international literature. It does not address any country's insurance or regulations; consult local rules for care pathways and costs.

Introduction: why "what should I do about a missing tooth" cannot be answered in a single sentence

Three things that patients usually roll into one question in the surgery are in fact three separate decisions: can this tooth still be saved, should the gap be filled at all, and if it is to be filled, filled with what. Each rests on its own body of evidence, and asking them together produces answers that contradict one another — one side says "a missing tooth must be replaced promptly", the other says "there is research showing that people can manage with a few fewer back teeth". Both sides have literature behind them: the first corresponds to "a higher number of teeth and a higher number of occluding pairs are positively associated with better quality of life" [F2], the second to the shortened dental arch concept being regarded, in older adults and on limited evidence, as a reasonable alternative to conventional prosthodontic rehabilitation [F4]. The difference lies in the conditions of applicability.

This is a domain-level article. It deals with the space *between* the individual concrete questions: the classificatory axes, the cross-option decision framework, the way the literature groups its populations, how the figures should be read, the logic of what costs are made of, and the full picture of risk disclosure. The concrete questions — "how much do removable dentures cost", "how should the cost of a full-mouth reconstruction be read", "can the gap be left after a molar is extracted", "does a missing tooth have to be replaced with an implant", "how are denture adhesives used" — each have their own canonical card that answers them in full; this article keeps one sentence of summary in the corresponding place and points the way (see "Downstream links" at the end).

The medical statements in this article rest primarily on systematic reviews, meta-analyses, economic evaluations and society-level consensus documents in international journals; the risk mechanism in sections 7 and 8 additionally draws on a single case report, whose level of evidence is marked low in the fact ledger and which is used paired with a systematic review of descriptive cases on the same topic, so that it does not carry weight on its own [F14][F15]. Systems-level matters (insurance coverage, fee regulation, statutes, subsidy schemes) fall outside the scope of this article; local systems and costs are covered in the corresponding canonical cards (TW).

1. The whole picture first: how large a phenomenon tooth loss is worldwide

Before choosing a route, it is worth confirming the denominator of this domain.

• The systematic analysis of oral conditions from the Global Burden of Disease study (GBD 2017) estimated that in 2017 there were 3.5 billion cases of oral conditions worldwide, of which 267 million were total tooth loss [F1].
• The same analysis records a pattern that runs counter to intuition: grouped by the World Bank's classification of economies, more economically developed countries carry a lower burden of untreated dental caries and severe periodontitis, but a higher burden of total tooth loss [F1]. That abstract offers no explanation whatever for the pattern, and this article does not speculate on one either; this is an ecological-level association, and inference to the individual level is prohibited [F1][F16].
• Why is tooth loss worth deciding about seriously? A systematic review that included 68 studies (9 randomised clinical trials, 6 cohort studies, 53 cross-sectional studies) records that in people aged 65 years or older, oral health-related quality of life is positively associated with a higher number of teeth, a higher number of occluding pairs, implant-retained overdentures and the shortened dental arch concept, and negatively associated with xerostomia, orofacial pain and poor chewing ability [F2]. Its discussion puts it more directly still: having a functional dentition, whether natural or prosthetic, matters for good oral health-related quality of life [F2].
• The same review is equally honest about the gaps in the evidence: in the current literature there is no consensus on the association between edentulism, caries and periodontal conditions and quality of life [F2].

This section can support two conclusions and no more: tooth loss is a phenomenon on a global scale; and "keeping a functional dentition" has evidential support for its association with quality of life in the literature [F1][F2]. It cannot be used to infer what will happen to any individual who does not replace a missing tooth — that belongs to individual clinical judgement.

2. Four coordinate axes: turning "replacing missing teeth" into a map

When the international literature compares options for replacing missing teeth, it usually stratifies first by the pattern of tooth loss or by edentulism, and compares device types only within a stratum: within the completely edentulous population it compares fixed against removable prostheses [F9]; within the population with an edentulous maxilla transitioning from conventional complete dentures it compares before against after [F10]; within the Kennedy Class I／II distal-extension population it compares implant-supported removable partial dentures against conventional removable partial dentures [F8]. Carrying the figures from one population over to answer a question about another therefore swaps the study subjects while keeping the conclusion [F8][F9][F10]. The four axes below are an editorial framework compiled by this site to match the way the literature groups its populations; they are not clinical criteria, and the basis for the content of each axis is marked at the end of the sentence [F16].

Axis 1: extent of tooth loss — the main axis along which the literature groups its studies

This axis determines which body of research you are entitled to cite. The literature divides into at least four populations that do not overlap one another (this table is a cross-reference compiled by this site from the populations used in the literature [F16]):

Carrying figures across populations is the reading risk that this site particularly wants to flag on editorial grounds [F16]. The survival rate of implant-supported fixed prostheses in complete edentulism, implant survival in the distal-extension situation, and survival performance in single-tooth replacement are three different sets of study subjects [F5][F8][F9].

Axis 2: source of support — what is holding the device up

• Natural-tooth support: a bridge is held up by the teeth on either side of the gap; a removable partial denture is supported jointly by the remaining teeth and the mucosa [F7].
• Mucosal support: a conventional complete denture is retained entirely by the alveolar ridge mucosa and by adhesion [F10][F11]. This is also why "retention" has become a research endpoint in its own right in the complete-denture field [F12].
• Implant support / implant retention: implant overdentures and implant-supported fixed prostheses [F9][F10]. Assessment, surgery and maintenance on the implant side belong to the implant domain — see P01.
• Mixed support: an implant-supported removable partial denture in the distal-extension situation relies on implants, remaining teeth and mucosa at the same time [F8].

Axis 3: fixed or removable — what this axis swaps is a set of trade-offs, not "good versus bad"

A systematic review published in 2026 that included 10 studies (a narrative synthesis, because heterogeneity was significant) sets out the trade-off on this axis very plainly: between fixed and removable there is a set of trade-offs — fixed prostheses provide superior function and stability but require more complex maintenance, whereas removable overdentures offer easier hygiene and a favourable balance of benefits [F9]. The same review records that fixed prostheses were associated with technical complications, while removable overdentures presented challenges with occlusal wear [F9].

Note the shape of that sentence: it is not "which one is better", but "what each side pays". The review's concluding sentence likewise hands the decision back to individual assessment — treatment must be individualised on anatomical factors, patient priorities and clinical feasibility [F9].

Axis 4: reversibility — the axis that fixes the order of the decision

Extraction is explicitly labelled irreversible in the literature [F3]. A systematic review that included 19 studies, admitting only publications with follow-up of 15 years or more, states in its practical-implications section that a tooth can be extracted and replaced at any time; however, extraction is a definitive and irreversible treatment [F3]. The same passage notes that even when a tooth seems to be compromised and requires treatment to be maintained, implant treatment also might require additional surgical procedures that might pose some risks as well [F3].

This article does not claim that extraction is the single irreversible procedure in this domain — how far each method of reconstruction alters the existing tooth substance, alveolar bone and soft tissue must be explained by a dentist against the individual situation; the sources cited here do not cover that comparison, so it is not written (this is a statement of this site's sourcing boundary [F16][F17]).

Why this article places "can it still be kept" ahead of "which kind of reconstruction" (this is this site's editorial ordering rationale [F16]) comes from two sentences in the systematic review above: extraction is a definitive and irreversible treatment, and implant survival rates do not exceed those of compromised but adequately treated and maintained teeth [F3]. The full discussion of "should this tooth be kept, or extracted and replaced with an implant" belongs to P01 and to the canonical cards; this article keeps only the position this axis occupies in the decision.

3. A systematic comparison of the three routes: read them separately by setting

What follows is set out separately for the four settings of Axis 1. The figures in each passage apply only to the population that passage names [F16].

Setting A: a single missing tooth

• The structure of the economic evaluation: a cost-effectiveness assessment taken from a societal perspective used a decision tree to estimate cost-effectiveness over a 10-year period, comparing a single implant with a three-unit tooth-supported fixed partial denture [F5]. The cost items included in that model were initial treatment costs, maintenance costs and the costs of treating complications [F5]; it separately counted transportation costs (calculated from the number of visits required for implant or fixed partial denture treatment) and patient time costs (estimated from the number of visits and the time required, the hourly wage and the employment rate) [F5].
• Which direction the model produced: in that model's 10-year results the single implant cost more than the fixed partial denture, while its average survival rate is recorded in the original as "10.4% higher" [F5] (the original does not state whether this is a relative value or a difference in percentage points, and this article reproduces it without converting it).
• Which variables move the conclusion: the sensitivity analysis in that study showed that initial treatment costs and survival rate influenced the cost-effectiveness conclusion [F5]; the paper also records that if the cost of an implant were reduced to 80% of the current cost, the implant would become the dominant intervention in that model [F5]. In other words, the conclusion flips with the cost assumption; it is not a fixed ranking [F5].
• Strength of evidence: the authors themselves state that the level of evidence for effectiveness is low, and that some aspects (satisfaction, for instance) were not included in the model [F5].
• What the society-level consensus says (both directions have to be cited): the review of economic evaluations from the European Association for Osseointegration consensus conference records more than one direction for the replacement of single missing teeth — two economic evaluations indicated that implant-supported single crowns provided better outcomes than fixed partial prostheses in terms of quality-adjusted tooth years or survival rates, and at lower cost; another economic evaluation found that implant-supported crowns cost more, but provided greater survival rates than fixed partial dentures [F6]. That same paper could not conduct a meta-analysis because of the high heterogeneity within the literature [F6].

What this passage can support: in the current literature the comparison of options for a single missing tooth has not converged on one direction — within a single consensus review there are records both of "lower cost with better outcomes" and of "higher cost but greater survival rates" [F6], while the conclusion of the decision-tree model moves with the assumptions made about initial treatment costs and survival rate [F5]. This article therefore offers no cost-effectiveness ranking for a single missing tooth [F5][F6]. Actual amounts and local systems fall outside the scope of this article.

Setting B: partial tooth loss (the removable partial denture route)

A systematic review covering literature from 1966 to 2020 assessed removable dental prostheses (RDPs) in partially edentulous patients with a history of periodontitis, and records the following [F7]:

• RDPs had only a limited effect on masticatory efficiency and nutritional status [F7].
• RDPs may improve oral health-related quality of life, but to a lesser extent than in patients treated to a shortened dental arch [F7].
• Several studies indicated that RDPs increase plaque accumulation [F7].
• The concluding sentence marks the boundary in the opposite direction at the same time: there is no strong evidence that RDPs per se will cause periodontal destruction including tooth loss [F7].
• Because of the heterogeneity of the data, no meta-analysis could be performed [F7].

These five statements have to be read together: they support neither "removable dentures are bound to harm the periodontium" nor "once they are in, nothing more is needed". What the literature gives is a set of conditions — the cleaning burden increases, and destruction is not inevitable [F7]. The population is restricted to people with a history of periodontitis, and must not be extrapolated to everyone who wears a removable denture [F7].

Setting C: distal extension (nothing to rely on at the back of the arch)

A systematic review of Kennedy Class I／II selected 11 articles from 103 initially identified studies, and records the following for implant-supported removable partial dentures (ISRPDs) [F8]:

• Across the studies the implant survival rate recorded runs from a lower bound of 91.7% to an upper bound representing no implant failure in that study (all implants surviving); there was no clear differentiation between immediate and delayed loading [F8].
• Overall, patient satisfaction and oral health-related quality of life improved significantly with ISRPDs compared with conventional removable partial dentures, or with removable partial dentures with healing abutments [F8].
• No implant configuration — implant type, location or attachment system — appeared to be better than another [F8].
• Risk of bias: 2 studies were of high risk and 3 of low risk, with the remaining 6 judged to have some concerns [F8].

Boundary: 11 included studies is a very small evidence base, and more than half carry concerns about bias [F8]. What this passage can support is that "this route exists and has positive patient-reported outcomes"; it cannot support any ranking of configurations [F8].

Setting D: complete edentulism

• Fixed against removable: the 2026 systematic review cited above records that fixed implant-supported prostheses demonstrated high long-term survival rates and superior masticatory efficiency and occlusal stability compared with removable options [F9]; and that patient-reported outcomes, particularly oral health-related quality of life, were significantly better with any implant-supported prosthesis, fixed or removable, than with conventional complete dentures [F9]. For the trade-off and the individualisation sentence see Axis 3 in section 2 [F9].
• Moving from conventional complete dentures to implant-retained overdentures: a systematic review of the edentulous maxilla, searching January 2014 to June 2024, selected 9 articles (5 randomised controlled trials and 4 prospective cohort studies) and records that overall, implant-retained overdentures significantly improved patient satisfaction and oral health-related quality of life compared with conventional complete dentures [F10]. The same review records that what is followed on the clinical side includes implant survival rates, peri-implant marginal bone loss, and the presence of peri-implant diseases such as peri-implant mucositis and peri-implantitis [F10].
• Whether digitally manufactured complete dentures are any better: a systematic review and meta-analysis that included 12 studies, with risk of bias considered low in most of them, records that no significant differences were found between digital and conventional methods regarding quality of life and most satisfaction criteria [F11].

Taken together these three passages establish one thing: the "upgrade path" in complete edentulism has positive records in the literature (conventional dentures → implant retention) [F10], but "digitising the manufacturing method" has not in itself produced a difference in quality of life in the current evidence [F11]. These are variables at two different levels, and cannot be talked about as substitutes for one another [F16].

4. Not replacing, or replacing less: what conditions the literature attaches

"Does it have to be replaced" is not a yes-or-no question in the literature but a set of conditions. This section sets out only the shape of those conditions and the strength of the evidence; the specific questions "can the gap be left after a molar is extracted" and "does a missing tooth have to be replaced with an implant" are answered in full by the canonical cards (see Downstream links).

Condition 1: confirm first that the "keep it" route has been assessed

The systematic review of follow-up of 15 years or more cited above records that implant survival rates do not exceed those of "compromised but adequately treated and maintained" natural teeth, which supports the notion that the decision to extract a tooth and place a dental implant should be made cautiously [F3]. The same paper notes that even when a tooth seems to be compromised and requires treatment to be maintained, implant treatment also might require additional surgical procedures that might pose some risks as well [F3].

How these figures should be read: the long-term (15 years and over) loss rates observed in that review ran between 3.6% and 13.4% on the tooth side, and between 0% and 33% on the implant side [F3]. These two sets of figures are not a head-to-head comparison — that review could not perform a meta-analysis because of the substantial differences between the studies [F3]. They are two independent ranges from separate bodies of research, set side by side. What the paper can support is its own concluding sentence: implant survival rates do not exceed those of compromised but adequately treated and maintained teeth, which supports the notion that the decision to extract a tooth and place a dental implant should be made cautiously [F3]. This article passes no judgement whatever on the relative magnitude of the two ranges (the original passes no such judgement, and this site does not pass one on its behalf [F16]).

Condition 2: where the "shortened dental arch" concept sits in the literature, and the ceiling of its evidence

A systematic review of older adults compared shortened dental arch (SDA) therapy with conventional removable partial denture rehabilitation on nutritional and economic outcomes [F4]:

• Of 92 studies taken through to full-text analysis, only 4 reports from two RCTs qualified for data extraction [F4].
• A meta-analysis therefore could not be performed, and the results were reported qualitatively [F4].
• The concluding sentence states it explicitly: where cost-effectiveness and nutrition are concerned, the shortened dental arch concept was identified as a reasonable alternative to conventional prosthodontic rehabilitation, and this rests on the limited evidence obtained from current literature [F4].

The weight of this passage has to be labelled honestly: 4 reports, two trials, no meta-analysis possible, population restricted to older adults [F4]. Note also that both arms compared in that review were partially edentulous adults who received treatment (one arm shortened dental arch therapy, one arm conventional removable partial denture rehabilitation); it is not a comparison of "no treatment at all" against "reconstruction" [F4]. It is therefore enough to establish that "not filling in every single missing tooth" is a concept the literature has discussed, and not enough to support any individual leaving a gap unfilled [F4]. The conditions under which it applies and does not apply are handled in full by canonical card KM-DENTAL-34.

Condition 3: "more teeth" and "shortened dental arch" are positively associated items standing side by side in the same review

A systematic review of people aged 65 years or older places four items side by side in one and the same sentence as positively associated with oral health-related quality of life: a higher number of teeth, a higher number of occluding pairs, implant-retained overdentures, and the shortened dental arch concept [F2]. A separate review of people with a history of periodontitis records that removable partial dentures improve quality of life to a lesser extent than shortened dental arch therapy does [F7].

Note the shape of this: the original does not write "more teeth" and "shortened dental arch" as two opposed bodies of evidence, but as four associated items pointing the same way [F2]; this article does not read them as opposed either (this is a reading note from this site [F16]). The same review is honest that in the current literature there is no consensus on the association between edentulism, caries and periodontal conditions and quality of life [F2]. The answer to this question depends on where the teeth are missing, how many are missing, and what the remaining occlusal relationship is — which is precisely the part that requires clinical assessment [F2][F7].

5. Full-mouth reconstruction: what the term corresponds to in the literature

"Full-mouth reconstruction" is a very broad expression. In the international literature it corresponds to at least three different sets of study subjects (this grouping is compiled by this site from the study endpoints [F16]):

1. Prosthetic options in complete edentulism: fixed implant-supported prostheses against removable overdentures against conventional complete dentures [F9].
2. Moving from conventional complete dentures to implant-retained overdentures: this is a before-and-after comparison within the same group of patients, with the literature assessing patient-reported and clinician-reported outcomes separately; the population of that review is restricted to the edentulous maxilla [F10].
3. The manufacturing method of the complete denture itself: digital (computer-aided design and manufacture) compared with the conventional workflow [F11].

Why they have to be told apart first: the study endpoints of the three differ — group 1 compares prosthetic types, group 2 compares change before and after within the same group of patients, group 3 compares a manufacturing process [F9][F10][F11]. Which of the three the phrase "full-mouth reconstruction" on a quotation belongs to determines which body of literature has anything to do with it [F16].

Reconstruction of the kind where the teeth are still present but the occlusion has to be rebuilt because of severe wear or extensive defects is not the same question as the replacement of missing teeth dealt with here (the dividing line used in this article follows the literature's own population definitions: every population in the sections above consists of people with missing or absent teeth [F16]); it belongs to fixed prosthodontics — see P02.

For how the cost of a full-mouth reconstruction should be read, and how local systems regulate it, see canonical card KM-DENTAL-32 (in production) and P12 (the domain article on costs and insurance systems).

6. Costs: this article writes the components and the variables, not the amounts

The reason the cost of replacing missing teeth is hard to compare from one case to another is that the single phrase "replacing a tooth" corresponds to a different number of items and a different time span in different treatment plans [F5][F16]. What follows is the universal structure of what costs are made of; it contains no amount, no range and no going rate.

Component items (the cost categories actually included in the economic-evaluation literature)

The list of cost items in a 10-year decision-tree model can serve as the skeleton for taking a quotation apart [F5]:

1. Initial treatment costs: the cost of the procedures in the course of treatment itself [F5].
2. Maintenance costs: continuing care of the device over its period of use [F5].
3. Costs of treating complications: complications have a rate of occurrence, so dealing with them afterwards is part of the plan rather than an exception [F5].
4. Transportation costs: calculated from the number of visits the course of treatment requires [F5].
5. Patient time costs: estimated from the number of visits and the time required, the hourly wage and the employment rate [F5].

Items 4 and 5 do not usually appear on a clinic's quotation, but in health-economic models they are real costs [F5]. This also explains why "how many visits are needed" is a substantive variable [F5].

Variables (the things that make two quotations differ widely)

• Extent of tooth loss: single tooth, partial, distal extension and complete edentulism are four different treatment plans [F5][F7][F8][F9].
• Source of support and number of implants: the society consensus review records that for the restoration of edentulous mandibles, two evaluations indicated that overdentures retained by two or four implants improved oral health-related quality of life outcomes, but cost more than complete dentures [F6].
• Survival performance and time span: the sensitivity analysis showed that initial treatment costs and survival rate influence the cost-effectiveness conclusion [F5]; in other words, "cheap" and "good value" are not the same thing on a 10-year scale [F5].
• Differences in the maintenance burden: fixed prostheses require more complex maintenance, removable overdentures offer easier hygiene [F9] — a different way of maintaining the device means a different structure of time and cost over the long run [F9].

The ceiling of the evidence in this section

The concluding sentence of the European Association for Osseointegration consensus conference states it plainly: to better assess the efficiency of implant-supported prostheses in various clinical conditions, more economic evaluations are needed that follow well-established methodologies in health economics [F6]. That same paper could not conduct a meta-analysis because of the high heterogeneity within the literature [F6]. This article therefore offers no cost-effectiveness ranking of any option [F6].

Systems-level matters (whether something is covered by public insurance, how fees are regulated, whether subsidies exist, how to read a receipt and an itemised bill) differ from country to country and fall outside the scope of this article. For local systems and costs see the corresponding canonical cards (TW): KM-DENTAL-13 (the cost of removable dentures) and KM-DENTAL-32 (the cost of full-mouth reconstruction), together with P12 (the domain article on costs and insurance systems).

7. Day-to-day care of removable dentures: retention as a variable, and where adhesives sit

For a mucosa-supported denture, "retention" is itself a clinical endpoint assessed in its own right — the systematic review of denture adhesives took as its primary outcomes objectively assessed variables directly related to mastication (denture retention, maximum bite force and masticatory efficiency), with patient-reported outcomes listed as secondary outcomes [F12]. This section sets out only where this variable sits in the domain and what its risk boundary is; the types of adhesive, the steps for using them and how to choose between them are handled in full by canonical card KM-DENTAL-31 (in production) and are not expanded here.

What the literature records about adhesives, and the certainty of that evidence

• A systematic review and meta-analysis that included 39 studies (43 articles) out of 1729 records identified records that denture adhesives significantly increased the retention of complete dentures; bite force and masticatory performance also improved, but the effect size was relatively smaller [F12].
• A systematic review of randomised controlled trials that included 13 studies with a total of 516 participants (mean age 65.5 years) records that most studies presented a low risk of bias, but that the certainty of the evidence was classified as low to moderate — low-to-moderate-certainty evidence (GRADE) [F13]; the same paper notes that further high-quality studies are needed to confirm these results with newly developed denture adhesives [F13].

Reading these two passages together means this: the effect of adhesives on retention is recorded consistently in direction across the literature, but the certainty of the evidence is limited, and what it addresses is the single variable of "retention", not the fit of the denture itself [F12][F13]. Whether a denture needs adjusting, relining or remaking has to be judged by a dentist after examination (this is a note about talking to a clinician, not a conclusion from the literature [F16]).

Risk boundary: zinc-containing adhesives and excessive use

• A case report and risk statement from 2011 records that zinc excess due to overuse of zinc-containing denture adhesive has been recognised as a potential cause of copper deficiency [F15]; the same paper records that recovery from neurological symptoms with replacement therapy appears to be limited, so that the emphasis falls on education and early detection [F15]. What that report presents is the case of a 58-year-old man diagnosed with copper deficiency myelopathy possibly due to zinc-containing denture cream overuse [F15].
• A 2026 systematic review of descriptive studies fills in the outline of this more completely: it included 34 publications describing 37 individual cases, spanning from 1972 to 2025 [F14]; zinc exposure most commonly resulted from oral supplements, denture adhesive creams and coin ingestion [F14]. The same review records that after discontinuation of zinc exposure with copper supplementation, haematologic recovery followed in the majority of cases, typically within weeks to months, while neurological manifestations improved more slowly and were sometimes incomplete [F14]; bone marrow findings also frequently led to initial misdiagnosis as myelodysplastic syndrome [F14]. Its overall judgement is that zinc-induced haematologic toxicity is an uncommon but underrecognised and largely reversible condition [F14].

The weight of this passage has to be labelled honestly: the two sources are, respectively, a single case report and a systematic review of descriptive cases [F14][F15]. They can describe the risk mechanism and the outline of the cases on record; they cannot be used to estimate an incidence, nor to calculate the risk for any individual [F14][F15]. Just one piece of information follows for practice: long-term, excessive use of a zinc-containing adhesive is a known risk situation, and how it is used and how much is used should be assessed by a dentist [F14][F15].

8. Risk factors: indications, adverse effects and contraindications

This section is medical risk disclosure; its content is general information at the level of the literature and cannot replace an individual diagnosis.

The boundary of the indications (the range the literature can support)

• Complete edentulism: implant-supported prostheses, fixed or removable, are significantly better than conventional complete dentures on patient-reported outcomes; the fixed form provides superior function and stability but requires more complex maintenance, while removable overdentures are easier to clean [F9]. Treatment must be individualised on anatomical factors, patient priorities and clinical feasibility [F9].
• The transition path in the edentulous maxilla: for the move from conventional complete dentures to implant-retained overdentures, significant improvements in satisfaction and quality of life were recorded across 9 articles [F10].
• Distal extension: compared with conventional removable partial dentures, implant-supported removable partial dentures showed significant improvements in patient satisfaction and quality of life; but no implant configuration appeared to be better than another [F8].
• Partial tooth loss with a history of periodontitis: removable partial dentures had only a limited effect on masticatory efficiency and nutritional status, and improved quality of life to a lesser extent than shortened dental arch therapy did [F7].
• Assessing whether the natural tooth can be kept comes before the choice of reconstruction method: implant survival rates do not exceed those of compromised but adequately treated and maintained teeth [F3].

Adverse effects and complications on record

• Device side: fixed prostheses were associated with technical complications; removable overdentures presented challenges with occlusal wear [F9].
• Implant side: peri-implant marginal bone loss, peri-implant mucositis and peri-implantitis are among the clinician-reported outcomes followed in studies of implant-retained overdentures [F10]. For the full risk picture on the implant side see P01.
• Periodontal / cleaning side: several studies indicated that removable partial dentures increase plaque accumulation [F7].
• Systemic risk: long-term excessive use of zinc-containing denture adhesive is associated with copper deficiency, and the manifestations on record include anaemia, cytopenias and myelopathy; neurological manifestations improve more slowly and are sometimes incomplete [F14][F15].
• Irreversibility: extraction is a definitive and irreversible treatment [F3].

Contraindications and situations calling for particular assessment

What the current literature mainly offers in this domain is conditional restrictions rather than absolute contraindications, and the quality of the evidence is limited [F4][F6][F7][F8][F17]; everything below therefore counts as "to be assessed individually by a dentist" rather than as a general rule:

• The evidence base for implant-supported removable partial dentures in the distal-extension situation is only 11 studies, of which 2 were of high risk of bias and 6 had some concerns [F8].
• The nutritional and economic outcomes of the shortened dental arch concept in older adults rest on only 4 reports from two randomised controlled trials, with no meta-analysis possible [F4].
• The conclusions on removable partial dentures in people with a history of periodontitis come from heterogeneous data with no meta-analysis performed, and the population is restricted [F7].
• Cost-effectiveness comparisons between the options could not be pooled because of the high heterogeneity within the literature, and the society consensus states plainly that more economic evaluations following established methodology are needed [F6].
• If unexplained anaemia, or an abnormality of walking or balance, appears around the time a denture adhesive is being used, that is a situation calling for medical assessment [F14][F15].

⚠ Compliance note: everything in this section is a compilation of the literature and does not constitute a treatment recommendation. Any judgement about indications or contraindications must be made by a dentist against the individual's oral conditions, general health and needs.

Every clinical statement in this article is mapped line by line to its cited source (see the sources and evidence chain below). It has not been clinically reviewed by a licensed practitioner. This is health information, not individual advice; assessment by a clinician is required.