Full mouth rehabilitation: how a multidisciplinary case is planned

In 1994 a group of researchers at the University of North Carolina carried out an experiment of disarming simplicity. Five patients, one hundred and seventeen teeth in all, were examined by between three and thirteen dentists for each tooth. Some of the clinicians examined the patients in person; others worked on a complete simulation of them: plaster casts, full-mouth radiographs, images of every tooth, periodontal charting and a written dental history. No dentist examined the same patient under both conditions. The question was whether examining the patient directly led to different decisions from those made on the records. The most instructive finding turned out to be another one: the variation in recommendations from one dentist to the next, under the same condition, was about three times greater than the difference between the average recommendations of the two conditions (1).

In other words, what shaped the recommendation was less what was being looked at than who was looking.

The study has obvious limits, and they should be stated at once: it concerned restorative decisions on single teeth, a small sample, and clinical practice of thirty years ago. It does not justify the conclusion that dentists “agree on nothing”, a conclusion that would be as false as it is alarming. It does, however, raise a more interesting question. If judgement varies even when decisions are made one tooth at a time, what happens when there are dozens of decisions to make, each of them conditioning all the others?

That is the situation of anyone who needs full mouth rehabilitation: rebuilding, wholly or largely, the function and appearance of a mouth. And this is where the central idea of this article lies. In an extensive case, the quality of the result is not decided in the dental chair, during the operative sessions. It is decided earlier, in a phase the patient barely sees: planning. The plan is not a preliminary to treatment. It is the part of treatment that determines all the others.

What full mouth rehabilitation means

The word causes some confusion, and it is worth clearing up. In everyday language “rehabilitation” brings to mind physiotherapy after orthopaedic surgery, recovery after a stroke, sometimes addiction programmes. In dentistry the term has a precise meaning, recorded in the international medical vocabulary as mouth rehabilitation: restoring chewing function, speech, comfort and aesthetics to a system that has lost them extensively. People outside the scientific literature say it more directly, and no less accurately: “full mouth reconstruction”, “redoing all my teeth”, rebuilding the mouth.

What distinguishes a full rehabilitation from a sum of treatments is not the number of teeth involved, but the fact that the problem concerns a system. Teeth, gums and supporting bone, temporomandibular joints, chewing muscles, lips and facial proportions work as a whole; when one of these elements gives way significantly, the others adapt, and the adaptations in turn become part of the problem.

The paths that lead to this situation vary. Advanced periodontitis that has made teeth drift and reduced bone support. Severe wear, from abrasion, erosion or grinding, that has shortened the crowns and altered the vertical dimension of the face. Prosthetic work carried out over decades, each piece reasonable in its time, which taken together no longer forms a coherent whole. The loss of several teeth in different areas. Sometimes congenital conditions, such as tooth agenesis, which adults carry with them through temporary solutions that inertia has made permanent.

In all these cases the clinical question is not “how do we treat this tooth”, but “what mouth do we want to achieve, and in what order can we get there with the least biological sacrifice”.

Why a complex case is not the sum of simple ones

Imagine having to decide whether to keep a tooth with reduced periodontal support. Taken in isolation, the decision depends on that tooth’s prognosis. Within a full rehabilitation, however, it also depends on other things: whether that tooth will serve as an abutment for a bridge, whether keeping it will complicate an orthodontic movement, whether extracting it would simplify an implant plan or, on the contrary, remove a valuable reference for the position of the future teeth. The same diagnosis, in different contexts, leads to different decisions. And this is precisely where the variation in judgement described at the start stops being a statistical curiosity and becomes a clinical issue.

The most authoritative literature acknowledges this explicitly. In 2022 the European Federation of Periodontology published an S3 level guideline, the most rigorous level in the methodology of the German association of scientific medical societies that the Federation followed, devoted to stage IV periodontitis: the form that, in addition to loss of attachment and bone, brings anatomical and functional consequences such as drifting and flaring of the teeth or bite collapse (2). The document is the product of thirteen systematic reviews commissioned for the purpose, an assessment of the quality of the evidence using the GRADE system, and a structured consensus process. Its approach is explicitly interdisciplinary: orthodontic tooth movement, splinting, occlusal adjustment, fixed or removable prostheses on teeth or implants, supportive periodontal care. And before all of this comes a recommendation worth reporting in substance: before treatment planning, it is critically important to complete a definitive and comprehensive diagnosis, gather the relevant information about the patient and re-evaluate frequently during and after therapy (2).

The guideline concerns a specific condition and should not be extended mechanically to every rehabilitation. But the principle it expresses is general: in complex cases, the sequence of decisions matters as much as the decisions themselves.

The director and the edit

There is an analogy that helps explain what coordinating a multidisciplinary case means in practice, and it comes from cinema. Films are not shot in the order in which we see them. Scenes set in the same place are shot together even if they are an hour apart in the story; the ending may be filmed in the first week. For the audience the story is linear; for the production it is a mosaic. It works only because, before the first take, there is a screenplay and a director who already knows what the final cut will be.

Full mouth rehabilitation is very much like this. The periodontist, the orthodontist, the surgeon, the endodontist, the hygienist and the dental technician work at different times, often on different problems, each with full competence in their own field. But if nobody holds the “final cut”, the image of the finished mouth, each phase risks being optimised for itself rather than for the result. A tooth moved impeccably from an orthodontic point of view may end up in an awkward position for the prosthesis; an implant placed where the bone was most abundant may not be where the tooth was needed.

This is why, in most cases, the role of director falls to the prosthodontist: not out of hierarchy, but because this is the figure who starts from the final result and works backwards, asking each discipline to prepare the ground for what comes next. The clinical team is not a series of specialists in succession; it is a shared project in which every intervention knows what it is for.

Diagnosis before the plan

If the plan is the decisive part of treatment, diagnosis is the decisive part of the plan. In an extensive case, gathering information takes time, and that time is not a delay: it is the first therapeutic act.

The starting point is the person, before the mouth. What brings them to seek help now rather than five years ago; what weighs on them most among functional discomfort, appearance and the fear of losing more teeth; what previous experiences, good or bad, they have had with treatment; what constraints of time, general health and personal organisation limit a pathway that may last months. This information is not the frame around the clinical diagnosis: it is part of it, because two patients with the same oral situation may need two different plans.

Then comes the clinical documentation proper. A complete periodontal examination, measuring site by site the support of every tooth. Full-mouth radiographs and, when indicated, a cone beam tomography to assess the bone in three dimensions. Impressions or digital scans of the arches, which allow the case to be studied outside the mouth. Photographs and, increasingly, short videos of the smile and of speech, because teeth are seen in motion, not in a pose. An assessment of the joints and chewing muscles. An analysis of the face: proportions, lip support, smile line, the amount of tooth visible with the lips at rest.

From these elements a first proposal of the final result is built, on models or digitally: the diagnostic wax-up, the shape of the future teeth modelled before any intervention. It is the tool that shows whether the project is feasible, how much space is needed, what must be moved, added or kept.

When the best plan is to wait

There is one outcome of diagnosis that surprises many patients, and sometimes a few colleagues too: concluding that, at least for now, extensive reconstructive treatment is not indicated. The European consensus on the management of severe tooth wear, signed by sixteen experts, says so clearly: decisions depend mainly on the severity and effects of the wear and on the patient’s wishes; restorative intervention is generally best delayed as long as possible; when it becomes necessary and is agreed with the patient, a conservative, minimally invasive approach is preferred, together with preventive measures, counselling and monitoring over time (3). Readers who wish to explore the subject will find a summary in our guide to worn teeth.

This is a consensus document among experts, which sits below systematic reviews in the hierarchy of evidence; it should be read as shared clinical guidance, not as experimental proof. But its message has value beyond tooth wear: in dentistry, as in medicine, diagnosis also serves to establish what not to do. A plan that includes a phase of observation, prevention and monitoring is not an incomplete plan. It may be the one that best respects the patient’s biology.

Sequence: why order matters more than technique

Once the result to be achieved has been defined, the plan becomes a sequence. Individual techniques change from case to case, but the logic of the order is remarkably constant.

It begins with urgent needs: pain, acute infections, fractured teeth that compromise chewing or social life. It continues with disease control, the least spectacular phase and the most important one: periodontal therapy, treatment of decay and of endodontic infections, removal of the factors that caused the problem. One does not build on ground that keeps “falling ill”. The European guideline on stage IV periodontitis is explicit on this point: the periodontal component of therapy follows the recommendations for the earlier stages, and the anatomical and functional consequences of the disease require additional interventions after active periodontal therapy has been completed (2).

Then comes a pause that many find frustrating and that is in fact valuable: re-evaluation. Some weeks after initial therapy, the response of the tissues is measured. Teeth that seemed compromised may prove recoverable; others that seemed sound may respond disappointingly. The initial plan is confirmed or corrected on the basis of real data, not forecasts.

Next comes the corrective phase, which, depending on the case, includes orthodontic tooth movement, periodontal or regenerative surgery and implant placement. Only then does the prosthetic phase begin, first provisional and then definitive. And finally, though not least, maintenance, which we will come back to.

Put like this, the sequence seems obvious. In practice the temptation to reverse it is constant, and it almost always comes from an understandable wish: to see the result soon. This is where the plan performs its most delicate function, because it must reconcile the legitimate desire for speed with respect for biological timing.

The provisional as a dress rehearsal

In extensive rehabilitations the provisional phase does more than simply “hold the place of the definitive teeth”. It is the moment when the project, so far drawn on models and images, is brought into the patient’s face: it shows the shape, the length, the colour, the effect on the lips and on speech.

A classic issue in these cases is the vertical dimension: the distance between upper and lower jaw when the teeth are in contact, which may have decreased with severe wear or after the loss of many teeth. Restoring it is often necessary to recreate space for the future teeth. A long-standing practice provides, before any definitive treatment, a trial period of the new vertical dimension, sometimes with removable appliances.

A systematic review published online in 2024 by researchers from the universities of Zurich and Geneva put this practice to the test (4). Out of 1,188 titles screened after removal of duplicates, the authors identified a single randomised trial and one hundred and three non-comparative studies; eighty of the latter included an evaluation phase, twenty-three did not. The conclusion is both cautious and clear: at present there is no evidence that an evaluation phase improves clinical or patient-reported outcomes; increasing the vertical dimension can succeed with or without it. The randomised trial included also reported that removable appliances tended to cause chewing difficulties, unclear speech and aesthetic discomfort.

It would be a mistake, however, to read this finding as a devaluation of the provisional. The authors themselves stress that the evaluation phase helps the clinician manage the patient’s expectations and organise the treatment sequence, and that it is most effective with fixed restorations, such as provisional crowns or adhesive restorations. The limit of the evidence must be kept in mind: the conclusion rests on a single randomised trial and on non-comparative studies, and the absence of proof of a benefit is not proof of its absence.

The lesson shifts the value of the provisional from the biological level to the communicative and design level. Its main purpose is not to verify a muscular adaptation; it is to let the patient see themselves, speak and smile with the project before it becomes irreversible, and to let the clinician correct what could not be foreseen on the models. It is the dress rehearsal of a performance: it does not guarantee the success of opening night, but it makes surprises far less likely.

Materials, technology and minimal invasiveness

Anyone looking for information on how to “redo all their teeth” mostly finds discussions of materials and technology: all-ceramic restorations, zirconia, implants, digital workflows, guided surgery. These are important tools, and research documents their progress. But their place, in a well-constructed plan, comes after the fundamental decisions, not before.

The European consensus on severe wear, already cited, points the way clearly: when restorative treatment becomes necessary, an adhesive, minimum-intervention approach is preferred, one that sacrifices as little healthy tooth tissue as possible (3). Contemporary technology has made exactly this possible: doing more while removing less. But the choice of how much to remove, and where, is not made by a material. It remains a design decision, and it depends on everything the diagnosis has brought to light.

The patient as co-author of the project

There is an aspect of planning that the dental literature has studied systematically only relatively recently: the patient’s role in decisions.

A study conducted at the department of prosthetic dentistry of the University Medical Center Hamburg-Eppendorf asked one hundred and one consecutive adult patients, before and immediately after an appointment, what role they wished to have in fourteen different treatment decisions, from prevention to prosthetics, and what role they had actually perceived (5). In eleven of the fourteen decisions patients wanted a more active role than the one they had experienced, and their perceived role matched their preferred role in fewer than half of cases. No sociodemographic characteristic substantially explained the difference. The study has the limits of a cross-sectional survey of a modest sample, but its message is hard to ignore: patients ask to take part more than we manage to involve them.

A survey conducted in Ontario on the values that guide the choice of treatment for a tooth with apical infection adds another piece (6). Among patients, the factor most often rated as important was communication and trust with the clinician, cited by 94 per cent of respondents, ahead of keeping the tooth, the aesthetic result, cost and longevity. Dentists, asked about the same issues, overrated the importance of some factors, such as dental insurance, and underrated that of long-term maintenance costs, considered important by 79 per cent of patients but only 60 per cent of clinicians. Here too the context must be remembered: the choice concerned a single tooth, in a health system different from ours, with partial response rates ranging from 15 to 43 per cent depending on the group. But the convergence with the German study is significant: what patients look for, before technique, is to understand and to be able to trust.

In a full rehabilitation this need is amplified. The patient must understand not a procedure but a pathway: how many phases, in what order, over what time, with what alternatives, with what trade-offs, and with what maintenance commitments once it is over. A plan the patient has not understood is not a shared plan, even if it has been signed.

There is also a simple test, which comes not from the literature but from the experience of working with very busy people. Many patients, before deciding, describe the plan to someone they trust: a family member, a friend who is a doctor, their own adviser. A good plan must survive that retelling. If, in passing from one person to another, the logic of the sequence is lost, if all that remains is the number of appointments or the estimate, the problem does not lie with the listener: it means the plan had not been made clear enough. Clarity, in this sense, is not a courtesy. It is a clinical property of the project.

Maintenance begins in the plan

The last phase of the sequence, maintenance, is also the one most often perceived as secondary: treatment “is over”, only check-ups remain. The literature suggests looking at it the other way round.

The European guideline on stage IV periodontitis includes supportive periodontal care among its recommended interventions, alongside orthodontic and prosthetic ones (2). And the subsequent guideline of the same Federation on the prevention and treatment of peri-implant diseases, also S3 level and also built on thirteen systematic reviews, states that prevention should begin when implants are planned, surgically placed and prosthetically loaded, and continue with a structured programme of periodic checks on the health of the tissues around the implants (7). Our guide to peri-implantitis covers the subject in more detail.

The point deserves attention, because it moves the start of maintenance from the end of treatment to its design. A prosthesis the patient cannot clean, an implant placed where the toothbrush cannot reach, a margin hidden where no check-up will ever see it: these are choices made at the planning stage that affect the lifespan of the result as much as, years later, the diligence of the patient or the hygienist. Planning a rehabilitation means planning how it will be maintained.

Questions patients often ask

How long does full mouth rehabilitation take?

There is no standard duration, and being wary of anyone who quotes one before the diagnosis is complete is a reasonable form of caution. Timing depends on the starting conditions, on how the tissues respond to initial therapy, on whether orthodontic or regenerative phases are needed, and on the person’s own circumstances. What can be defined precisely once the diagnosis is complete is the sequence of phases and an estimate of the time each will take, with the uncertainties stated.

Can fixed teeth be fitted quickly?

In selected cases, yes. Immediate loading of implants makes it possible to fit a provisional fixed prosthesis within a few days of surgery, when the condition of the bone and of the patient allows it. A Cochrane review pooling twenty-six randomised trials found no convincing evidence of clinically important differences in prosthesis or implant failures between immediate, early and conventional loading in the first year (8); the authors also point out, however, that only three trials were at low risk of bias and that follow-up was limited to the short term. In any case, speed in the surgical and prosthetic phase presupposes careful planning; it does not replace it. And not every case is a candidate: establishing this is precisely one of the tasks of diagnosis. The indications and planning of fixed implant prostheses for a whole arch are covered in a dedicated article on full-arch rehabilitation.

Does full rehabilitation necessarily mean implants?

No. In many patients the project aims to keep and recover as many natural teeth as possible, through periodontal, endodontic and orthodontic treatment and adhesive restorations; in others implants are one part of the pathway; in others still they are the main solution. The choice depends not on the technique available but on the prognosis of the teeth, the condition of the tissues and the person’s priorities. For an implant approach attentive to tissue biology, see implantologia-biomimetica.com.

Why does the study phase require several appointments?

Because it is the phase in which the decisions that cannot be changed later are made. Periodontal examinations, radiographic and tomographic images, models, photographs and the design of the result take time to gather and, above all, to discuss with the patient. It is the least visible time of the whole pathway and, in all likelihood, the time that most affects the result.

The work you do not see

Let us return for a moment to the 1994 experiment. Its most useful lesson is not that clinicians are inconsistent, but that clinical judgement is a human act, and like every human act it varies. Medicine learned long ago that the answer to this variability is not a claim to individual infallibility, but rigour of approach: complete diagnosis, rational sequences, re-evaluation, shared decisions, evidence-based guidelines. In full mouth rehabilitation this rigour has a simple name, one that evokes no technology at all: planning.

It is a fate shared by many complex disciplines. Of architecture we see the façade, not the structural calculations; of a film we see the scenes, not the screenplay or the edit; of a surgical operation we remember how long it lasted, not the hours spent studying it. In all these cases, the part that decides the quality of the result is precisely the part the audience does not see.

Perhaps the question worth asking, when facing an extensive course of treatment, is not which material will be used or how many appointments will be needed. It is another one, less comfortable and more useful: if two clinicians can look at the same mouth and imagine two different plans, which of the two deserves trust: the one who seems more sure of their plan, or the one who can explain why that order was chosen and not another?