Periodontitis and dental implants: what a history of disease changes in the prognosis for the implant
The implant usually holds. An implant placed in a patient with periodontal disease nevertheless fails more often than in someone who has never had periodontal disease. Periodontitis, commonly called gum disease, is a chronic inflammatory disease of the tissues that hold the tooth in the bone, linked to plaque bacteria; once treated, it leaves behind less bone and a tendency to recur.
Pooling observational studies in which patients were followed from one year to more than ten years after the implants were loaded, the picture repeats itself on two points. Implants in people with a history of periodontitis failed roughly one and a half to two times more often. Inflammation around the implant reaching the bone appeared in them roughly three to four times more often. For the superficial form, confined to the mucosa, one of these pooled analyses showed no difference. The difference in implant survival grew, moreover, with the length of follow-up, and it is most clearly visible at ten years.
These are observational data, however, not experimental data. So it is known that the risk rises. It is not known by how much it will rise in a given person.
Nor is the risk distributed evenly, and two groups stand out most: patients with the rapidly progressing form, described in the classification as grade C, and those with stage III and IV disease, that is, with substantial bone loss around the teeth. For the second of these groups, the pooled data come from a single study.
What the pooled studies report above all is how many times the risk rises. A pooled figure of implants per hundred, to which that difference applies, cannot be read from them. This is where the boundary of this knowledge runs, and it is why a prognosis cannot be calculated from a diagnosis made years ago alone. What is known is that around an implant that has held, inflammation appears more often. On that, the condition of the gums before the procedure does have an influence.
The groups being compared also differ in more than the disease they have had. Other risk factors, such as smoking or plaque control, may be distributed unevenly between them, and these influences cannot be fully disentangled, because nobody randomises people to smoking. And this is precisely the good news for the patient: part of the difference sits in things they can affect - in plaque, in cigarettes, and in whether they come to supportive care visits.
What to ask before being referred for the procedure
The answers are recorded in the chart, and it is they that decide the timing. Ask for them in writing:
- What percentage of sites in my mouth bleed on probing, that is, after measurement with a thin graduated probe?
- How many pockets of 4 mm or deeper are left, and does any of them bleed?
- What stage and what grade were recorded in my diagnosis?
- When are we setting the re-evaluation, and what exactly will decide the timing of the procedure then?
- How often will I come back for supportive care visits after placement, and who will run them?
The third question tends to be skipped, and it carries the most weight: the stage says how much tissue has already been lost, the grade - how fast it was being lost. Ask the first and second questions again after treatment. Only two measurements set side by side show whether the disease has responded or merely gone quiet - and it is they, not the calendar, that close gum treatment before an implant.
Gum treatment before an implant: the timeline from examination to decision
Preparing the gums for an implant has a fixed order; fixed intervals it does not have, and no guideline gives a total. The path from the first examination to planning the procedure usually closes within a few months, and extracting a tooth and remodelling of the socket add weeks of their own.
Point zero: a full-mouth periodontal examination. The clinician measures the pockets at every tooth and takes radiographs. Without a diagnosis there is no date for the procedure.
Step one: plaque control and control of risk factors. The patient learns to clean the teeth differently, the clinician removes deposits above the gum, and the two of them talk about cigarettes and about diabetes. When plaque covers less than one fifth of the tooth surfaces, tissues heal better, both after periodontal procedures and after implant surgery. This threshold the patient controls alone.
Step two: subgingival instrumentation. At follow-up a few months later, pockets are on average almost two millimetres shallower. Over the same period about three in four close enough that they stop being pockets, and bleeding falls by roughly two thirds. The deepest pockets recede the most, and it is usually they that decide whether a third step will be needed. The interval to re-evaluation is counted from the last instrumentation appointment, not from the first.
Re-evaluation: once the tissues have healed. That is what the European guideline says, and it deliberately contains no number of weeks. This is not an oversight: evidence allowing a single timing to be named for everyone simply does not exist, and tissues remodel at different rates, so in practice the re-evaluation is usually set at somewhere between a few and several weeks.
What about teeth with a hopeless prognosis. A tooth with a hopeless prognosis can be extracted at any stage of periodontal treatment. There is no need to wait for that treatment to finish. The socket then needs time for the bone to remodel, and a single figure for everyone is not given in the guidelines.
When are the gums ready for the procedure?
You will not recognise it by how you feel. Readiness of the gums has two conditions, and both are read from the chart of measurements. The first condition: no pocket of 4 mm or deeper bleeds on probing. The second: there are no pockets 6 mm deep or more. Meeting both moves the patient into supportive care, and only then is the implant planned.
If the conditions are not met, a third step of treatment follows, with closed and open curettage or with bone regeneration, after which the assessment is repeated once more. The timeline ends where surgical planning begins. Gum treatment before an implant is not a stage that closes: it passes into supportive care and continues.
How can you tell the disease is still active?
By bleeding, not by pain. Periodontitis can go years without hurting, and that is its most dangerous feature.
Four signals you can see yourself:
- blood on the brush or on the floss, repeatedly in the same place;
- a gum that has receded far enough to expose part of the root;
- a tooth that has started to move or has shifted and changed the bite;
- a persistent unpleasant smell from one area, despite good hygiene.
None of them replaces measurement. In the practice, periodontal treatment in Warsaw Wola begins with the probe and with the chart in which the depth of every pocket is recorded, along with whether blood appeared after the measurement. Depth on its own is not enough, because a pocket can be deep and quiescent; only blood after gentle probing says that inflammation is under way at its base. The radiograph answers a different question: it shows the history of the disease, that is, how much bone has been lost so far. Two radiographs a few years apart say something about the rate; one says nothing about activity.
There is a trap here.
In people who smoke, the gums bleed less, because nicotine narrows the vessels. An absence of blood in a smoker therefore does not mean the disease has burned out. Smoking itself is, alongside diagnosed periodontitis, the best-documented risk factor for inflammation around an implant.
What has to be stable before we plan the procedure?
Three points must be verifiable. At some teeth, things will not be ideal.
The first is the treatment endpoint reached, or a written statement that at particular teeth it cannot be reached. Such a note does not block the procedure; it does change the plan: a tooth with a pocket that cannot be closed gets its own schedule of checks or goes on the list for extraction before placement, and the fate of a single tooth is decided separately, which is covered by the article Save the tooth or place an implant.
The second is hygiene carried out by the patient, because healing after surgery depends on it more than on the technique of the procedure. The third is control of general factors: smoking and poorly controlled diabetes worsen the outcome on both sides, healing of the periodontium and healing around the implant alike.
The neighbourhood of the planned implant has to be looked at separately. Teeth at which a vertical bone defect has remained on the radiograph, that is, a trough along the root visible only on the X-ray, carry roughly twice the risk of loss during supportive care compared with matched teeth on the opposite side of the arch in the same person.
Here lies the weakest point of the whole recommendation, and it has to be named outright. Nobody has run a study in which patients with active inflammation were randomly assigned to placement straight away or to placement after treatment. Such a study would be irreconcilable with the welfare of its participants. Gum treatment before an implant therefore rests on observation and on the agreed position of scientific societies, not on an experiment.
Does care end once the implant is placed?
No. What changes is only what is measured, and how often.
The European recommendations for the periodontium require the interval between supportive care visits to be matched to the patient's risk, within a range of three to twelve months. For people treated for periodontitis they cite an interval of three to four months. The implant guideline does not set a range of its own here.
Absence of regular preventive care was listed among the risk factors for inflammation around an implant, that is, peri-implantitis, in a review gathering the meta-analyses published to date, although on weaker evidence than for smoking and for diagnosed periodontitis. In the practice of Modern Dental & Orthodontics (Klinika MDO) it is repeatedly confirmed that it is the rhythm of visits that weighs most on how long the restoration will serve.
At a supportive care visit, the same things are measured as at teeth: the depth of the sulcus around the implant and bleeding on probing. The reference point is the radiograph taken right after the prosthetic work was fitted; without it, there is no way to say later whether bone has been lost or whether there was always only that much. The home part of care changes too: under a bridge and under a crown on an implant the brush does not reach everywhere, so interdental brushes matched for size and floss for cleaning beneath prosthetic work are added.
An implant inherits the conditions it finds in the mouth
Gum treatment before an implant falls into a simple order of urgency. First bringing the inflammation under control, because without that the rest of the plan has nothing to stand on. Then the timing, which is set by the re-evaluation and not by the calendar. Last, supportive care, which lasts as long as the implant.
If the gums bleed on brushing or one of the teeth is moving, the first appointment belongs to the periodontist, not to the implantologist. An implant placed into uncontrolled inflammation neither stops the disease nor bypasses it: it moves it onto a support that defends itself less well than a tooth.
This order does not delay treatment. It safeguards it.
Consult your case with an expert and get your treatment plan
Frequently asked questions
Can you have an implant with gum disease?
Yes, once the disease has been stabilised and on condition of regular supportive care visits. The contraindication is not a history of gum disease in itself, but inflammation that is uncontrolled at the time of the procedure, together with an inability to maintain hygiene around the future restoration. The decision is made after re-evaluation of the tissues, not at the first implant consultation and not on the basis of a radiograph alone.
Will I be left with a gap after the tooth while the gums are treated?
Not necessarily. Temporary restorations are used for this period, and it is worth asking about them at the first appointment, before the decision on the order is taken. The choice depends on how many teeth are missing and where. There is one condition: the restoration must not press on healing tissues or make the treated sites harder to clean.
Does a loose tooth have to be replaced with an implant straight away?
Not always. Mobility can be a consequence of inflammation and of lost bony support, and after periodontal treatment it can decrease, especially where the degree is slight. A tooth that holds is usually a better solution than an implant. The decision to extract is therefore deferred to the re-evaluation, unless the mobility makes eating impossible or prevents the neighbouring tissues from healing.
How many weeks after periodontal treatment ends is readiness for an implant assessed?
The guidelines do not give a single number of weeks and speak of assessment once the tissues have healed. In practice the date is usually set somewhere between a few and several weeks after the last subgingival instrumentation. Closer to the lower end are people with shallower pockets and controlled plaque; smokers and patients with poorly controlled diabetes wait longer. What decides the timing is the result of the measurement, not the length of the interval, so the date does get moved.
Do you have to stop smoking before placement, and how far in advance?
Stopping smoking is recommended and acts on both kinds of healing at once: of the periodontium and of the tissues around the implant. A number of weeks the guidelines do not give, so nobody will honestly name a specific date. The conversation about cigarettes is held at the start of gum treatment. A week before the procedure is already too late for that conversation, because this change needs months.
Can an implant get sick too?
Yes. Inflammation around an implant has two forms: the earlier one, confined to the mucosa and reversible, and the later one, with bone loss that is not recovered. Symptoms can be sparse, which is why it is diagnosed by measurement and radiograph rather than from complaints. Bleeding around a crown on an implant always calls for reporting to the practice.
How often are visits needed after an implant is placed?
In people previously treated for periodontitis, the interval is matched to risk; the guidelines give a range of three to twelve months, and after periodontal treatment they cite three to four. In the first year, checks after the procedure and after the prosthetic work is fitted are added to this. A control radiograph is taken after the restoration is loaded, so that there is a reference point for the years that follow.
Read more:
- Periodontist in Warsaw Wola
- Peri-implantitis — inflammation around a dental implant. Symptoms, treatment, prevention
- Closed vs open curettage — a comparison of methods for treating advanced periodontitis
- Save the tooth or place an implant — how to make a decision you will not regret
- Bone regeneration around teeth (GTR/GBR) — when a tooth can be saved instead of extracted
Content and liability disclaimer
This article is informational and educational in nature and does not constitute medical advice, a diagnosis or a therapeutic recommendation — it does not replace a consultation with a specialist. If you are experiencing symptoms, have doubts or are facing a decision about treatment, consult a dentist. The methods described and the data cited are general in nature. The results of scientific studies relate to populations, not to an individual patient. The course and outcome of therapy depend on the individual clinical situation and may vary between patients. No information contained in this article constitutes a guarantee of result. The content has been prepared with due care, based on publicly available medical knowledge and the scientific publications indicated in the Sources section. We do not advise taking or refraining from any health-related action solely on the basis of the content of this article, without prior consultation with a doctor.
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