Peri-Implantitis: Symptoms, Stages and How It Is Treated

What is peri-implantitis?

Peri-implantitis is an inflammatory condition affecting the soft tissue and the supporting bone around an osseointegrated dental implant. It is defined by three findings taken together: bleeding or suppuration when the tissue is gently probed, increased probing depth compared with earlier measurements, and radiographic bone loss beyond the small amount of remodeling that normally occurs in the first year after placement.

Large meta-analyses put the prevalence at roughly 22 percent of implants, with the milder precursor condition affecting around 43 percent. Those numbers are high enough that anyone with implants should treat maintenance as part of the treatment rather than as an optional add-on.

Does peri-implantitis hurt?

Usually not, and this is the most dangerous thing about it. Unlike a natural tooth, an implant has no periodontal ligament — the fiber suspension that carries nerve endings and reports pressure and inflammation. Without it, an implant can lose a substantial amount of surrounding bone while feeling entirely normal to bite on.

When pain does appear, it typically means one of three things: the inflammation has become acute with pus formation, the surrounding soft tissue is swollen and pressing against the crown or the abutment, or bone loss has progressed far enough that the implant has begun to loosen. Discomfort with a dental implant is therefore never something to observe and see whether it settles. Mild tenderness when brushing, a dull pressure, or gums that feel sore in one specific spot all warrant an appointment.

What does peri-implantitis look like?

In the mouth, the earliest visible change is color and texture: healthy peri-implant tissue is pale pink and firm, inflamed tissue is red or dusky, glossy and swollen, and it bleeds readily. As the condition advances, the gum margin migrates downward and the polished implant neck — or, in more advanced cases, the rough threaded surface — becomes visible. Pressing gently along the gum may express a bead of pus.

On an X-ray the picture is more definitive: a crater-shaped or saucer-shaped radiolucency around the implant, widest at the top and tapering downward, in contrast with the straight, even bone level seen around a healthy implant. Your dentist compares this against the baseline film taken when the implant was placed, which is why that first radiograph matters years later.

What causes peri-implantitis?

The primary cause is bacterial biofilm accumulating at the implant–tissue junction. Everything else on this list changes how easily that biofilm forms and how strongly the body reacts to it.

• A history of periodontitis. The strongest single predictor. Patients who lost their natural teeth to gum disease carry both the bacterial profile and the host response that caused it.
• Inadequate plaque control, often because the restoration is shaped in a way that makes cleaning difficult.
• Smoking, which impairs blood flow to the peri-implant tissue and blunts healing.
• No maintenance program. Implants placed and then never professionally reviewed show markedly higher rates.
• Residual cement from a cemented crown, left below the gum line, where it acts as a permanent plaque trap. This is a common and entirely preventable cause, and it is the main argument for screw-retained restorations.
• Poor implant position or prosthetic design, including over-contoured crowns and bridges that cannot be cleaned underneath.
• Uncontrolled diabetes and other conditions affecting immune response and wound healing.
• Lack of keratinized tissue around the implant, which makes brushing uncomfortable and therefore less thorough.
• Occlusal overload, particularly in patients who grind, which is a contributing rather than an initiating factor.

How peri-implantitis is treated

Non-surgical therapy

The first step is always mechanical disruption of the biofilm. This is done with instruments that do not scratch the implant surface — titanium or PEEK-tipped curettes, air-polishing devices using glycine or erythritol powder, and ultrasonic tips with non-metallic coverings — combined with antiseptic irrigation, usually chlorhexidine. If the crown is removable, taking it off gives far better access and is worth doing.

At the same time the cause is addressed: residual cement is removed, an over-contoured crown may be reshaped or remade, home care technique is retrained with interdental brushes sized to the site, and smoking cessation is discussed. Non-surgical therapy alone reliably resolves mucositis. For established peri-implantitis it improves the situation but often does not fully resolve deep defects, which is why the site is reassessed after six to eight weeks.

Surgical therapy

If bleeding and deep pockets persist, surgery gives direct access to the implant surface. Two broad approaches exist. Resective surgery reduces pocket depth by recontouring the bone and repositioning the gum, and may include smoothing the exposed implant threads; it is effective and predictable but leaves the implant visibly longer, which matters in the front of the mouth. Regenerative surgery fills the defect with a bone substitute and often a membrane, aiming to rebuild support; it works best in deep, contained, circumferential defects.

Both depend on thorough decontamination of the exposed implant surface, which is technically demanding because the roughened surface designed to hold bone also holds bacteria.

Antibiotics

Antibiotics are an adjunct, never a stand-alone treatment. Systemic antibiotics are reserved for acute infection with swelling, pus and systemic signs, or for medically compromised patients. Locally delivered antimicrobials placed directly into the pocket are sometimes used alongside mechanical debridement. Prescribing antibiotics without removing the biofilm produces a temporary improvement and a return of symptoms after the course ends.

When the implant has to be removed

Removal becomes the right decision when the implant is mobile, when bone loss exceeds roughly half the implant length, when infection recurs despite properly executed treatment, or when the implant sits in a position that cannot be cleaned or restored acceptably. Explantation is usually straightforward, and after healing — often with bone grafting — a new implant can frequently be placed. It is worth saying plainly: replacing a failing implant early, in a controlled way, generally produces a better long-term result than defending one that has already lost most of its support.

Prevention: what actually works

Maintenance visits every three to six months, with probing and periodic radiographs, are the single most effective measure — they catch mucositis while it is still curable. Daily cleaning of the implant–gum junction with an interdental brush or a water flosser matters more than the toothbrush itself. Screw-retained crowns avoid the cement problem entirely. Smoking cessation produces a measurable reduction in risk. And if you lost your natural teeth to periodontitis, that condition must be treated and stable before implants are placed, and monitored more closely afterward.

Sources

• American Academy of Periodontology (AAP) – 2017 World Workshop case definitions for peri-implant health, mucositis and peri-implantitis
• European Federation of Periodontology (EFP) – consensus reports and clinical practice guidelines on peri-implant diseases
• International Team for Implantology (ITI) – treatment guidelines for peri-implant disease management
• Academy of Osseointegration (AO) – position statements on implant maintenance and long-term outcomes
• American Dental Association (ADA) – patient information on dental implants and implant care
• Cochrane Oral Health – systematic reviews on interventions for treating peri-implantitis