What Is Peri-implantitis? Symptoms and Treatment Methods

The success of implant treatment is usually measured not by the day the implant is placed but by the years that follow. The implant itself does not decay; but the gum and bone around it can enter an inflammatory process, just as with natural teeth. The advanced stage of this picture is called peri-implantitis and is the most important long-term risk of implant treatment. In this article we look at how the process begins, the signs that reveal it and what treatment involves.

A Two-Stage Process

Problems around an implant are examined under two headings, and the difference between them is decisive for treatment.

• Peri-implant mucositis: Inflammation is limited to the soft tissue surrounding the implant. The gum becomes red and swollen and bleeds on probing, but there is no loss of supporting bone. With appropriate treatment this stage is reversible.
• Peri-implantitis: The process has passed beyond the soft tissue and begun to affect the bone surrounding the implant. Bone loss is visible on radiographs. Lost bone is not expected to return on its own; the aim of treatment is to halt the process and preserve as much tissue as possible.

Thinking of their equivalents in natural teeth, mucositis resembles gingivitis and peri-implantitis resembles periodontitis. An important difference is that the tissue around an implant lacks the connective tissue fibres found around a natural tooth, so inflammation can progress more rapidly.

What Are the Symptoms?

The early period is often silent — which explains why regular check-ups matter. The signs that may be noticed are:

• Redness and swelling of the gum around the implant
• Bleeding during brushing or spontaneously
• Discharge from the gum margin
• Gum recession exposing the implant superstructure
• A persistent bad taste or odour
• A feeling of pressure, mild pain or discomfort when chewing
• Perceptible looseness of the implant at an advanced stage

The absence of pain does not mean there is no problem. Bone loss usually progresses without pain and is often first noticed on a routine radiograph.

Risk Factors

• Inadequate oral hygiene: Plaque accumulation around the implant is the principal trigger.
• Past gum disease: Risk is higher in people who lost teeth to periodontitis.
• Smoking: Affects tissue blood supply and the healing response.
• Uncontrolled diabetes: Affects the inflammatory response and healing.
• Not attending check-ups: The early stage can only be caught through examination and radiographs.
• A prosthesis that cannot be cleaned: A superstructure whose interproximal areas cannot be reached makes hygiene effectively impossible.
• Residual cement: In cemented prostheses, cement left beneath the gum is a constant source of irritation.
• Thin or minimally keratinised gum: The quality of the soft tissue around the implant affects its resilience.
• Excessive chewing forces: A grinding habit and a mismatched bite can aggravate the picture.

How Is It Diagnosed?

Assessment brings together three components: measuring the pocket depth around the implant, checking for bleeding or discharge on probing, and monitoring bone level on radiographs. What is decisive here is not a single measurement but change over time. For this reason the first radiograph taken after the implant is placed is kept as a baseline record, and later check-ups are compared against it.

Treatment Approaches

Non-Surgical Treatment

This is the first step at the mucositis stage and in limited peri-implantitis. Deposits on the implant surface and superstructure are cleaned with special tips that do not damage the implant surface. Where necessary the prosthesis is removed so the area beneath can be cleaned and any residual cement taken away. Where the dentist considers it appropriate, antiseptic applications are added. An inseparable part of this stage is individualised oral care instruction; preventing recurrence depends on it.

Surgical Treatment

This comes into consideration when bone loss has progressed and non-surgical treatment is not sufficient. The gum is raised to reach the implant surface directly, granulation tissue is removed and the implant surface is decontaminated. Depending on the shape of the defect, two directions can be followed: cleaning the area and repositioning the gum, or in suitable defects using graft and membrane to support the bone. How predictable the outcome is depends on the shape and extent of the bone loss.

Removal of the Implant

Where most of the bone support has been lost and the implant has loosened, removal may be necessary. This is not an admission of failure but a decision aimed at preserving tissue: once the area has healed, a new implant can be planned, if needed after procedures to increase bone volume. For the routes followed where bone is insufficient, see our article on sinus lifting and bone grafting.

What Works in Prevention?

• A cleanable prosthesis design: The superstructure should be planned so interproximal areas can be reached. This is a responsibility of design as much as of treatment.
• Daily care: Alongside brushing, interdental brushes, floss suitable for implants and the aids your dentist recommends are used.
• Regular professional cleaning: The interval is set individually; tartar cleaning matters even more in patients with implants.
• Radiographic monitoring: Bone level is assessed comparatively at intervals.
• Stopping smoking: Among modifiable risk factors, this is the one with the most marked effect.
• Treating existing gum disease: This is expected to be addressed before an implant is placed.

Care matters even more with multi-implant fixed prostheses; for details see our articles on the All-on-6 implant technique and implant aftercare.

How Often Are Check-Ups Needed?

The check-up interval for patients with implants is not set by a standard calendar; it is adjusted to the person's level of risk. The interval shortens for people with a history of gum disease, smokers, those with diabetes and those carrying multi-implant fixed prostheses. A check-up does not look at the implant alone: the condition of the remaining natural teeth, the bite relationship and the marginal fit of the prosthesis are assessed together. Pocket depths around the implant are recorded and compared with previous measurements — because what is meaningful here is not a single value but change over time.

Radiographs are not repeated at every check-up; the dentist determines the necessary interval according to clinical findings and risk level. This is why the approach of "I have no complaints, so I need not attend" does not work with this condition: the process has a silent phase, and intervention during that phase results in far less tissue loss than intervention at an advanced stage.

Summary

Peri-implantitis is the stage at which the inflammatory process around an implant reaches the bone. While the early stage limited to soft tissue (mucositis) is reversible with appropriate treatment, once bone loss has developed the aim shifts to halting the process. Because the early period usually progresses without pain, regular examination and radiographic monitoring are as decisive as daily care.

This article is for general information. The condition of the tissues around your implant and the treatment approach that suits you are determined by clinical examination and radiological assessment.