Peri-implantitis Surgery
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Direct answer
Surgery for peri-implantitis enters the picture once non-surgical care — professional debridement with plastic or titanium instruments, antiseptics, and hygiene coaching — has failed to arrest inflammation and progressive bone loss around an integrated implant. The operation exposes the defect through a full-thickness flap, removes granulation tissue, and decontaminates the implant surface, using citric acid, tetracycline paste, saline or laser; from there the path forks. Resective surgery — implantoplasty to smooth exposed threads plus osseous recontouring and an apically repositioned flap — suits horizontal bone loss with a cleansable result. Regenerative surgery — grafting the intrabony component with xenograft under a resorbable membrane — suits contained defects with residual walls. An implant that is mobile, or has lost most of its support, is removed.
What you must remember
- Definitions that anchor every answer: peri-implant mucositis is reversible inflammation of the soft tissue without bone loss; peri-implantitis adds progressive loss of supporting bone; mobility appears only terminally, because an integrated implant does not move until nearly all support is gone.
- Diagnosis: bleeding on probing with suppuration, probing depths commonly above 5-6 mm and increasing, and radiographic crestal bone loss confirmed on serial periapical or cone-beam films — comparing with the baseline film at placement is the honest method.
- Surface decontamination toolbox: citric acid (about 30-60 seconds at pH 1), tetracycline or minocycline paste scrubbing, copious saline, air-polishing with glycine powder, Er:YAG laser and photodynamic therapy — none has decisively beaten the others in trials, and steel curettes are avoided because they gouge and smear the titanium surface.
- Resective path: implantoplasty (burring the exposed threads smooth and polished for cleansability) with osseous recontouring and apically repositioned flap — best for horizontal, non-aesthetic, posterior defects.
- Regenerative path: guided bone regeneration of the intrabony/circumferential defect with xenograft or xenograft-autograft under a resorbable collagen membrane — best for contained defects with several walls and, per current evidence, the best radiographic fill when combined with implantoplasty of the exposed surface.
- Removal criteria: mobility, circumferential bone loss involving most of the fixture, unresolved infection, or a defect unrestorable to health — remove, debride, graft, and plan replacement.
- Risk-factor recap and maintenance: previous periodontitis is the strongest patient-level risk, with smoking and uncontrolled diabetes next; after surgery, supportive care every three to four months is standard, because peri-implantitis recurs.
A defect worked through
A 61-year-old, a treated periodontitis patient, presents with a suppurating 9 mm pocket on the mesial of a mandibular molar implant placed six years ago; the current periapical film shows a saucer-shaped defect reaching the fifth thread, against a baseline at the first. Non-surgical therapy with titanium curettes, chlorhexidine and systemic amoxicillin with metronidazole calmed the bleeding but the pocket and the radiolucency persist. At surgery, a full-thickness flap is raised beyond the mucogingival junction for mobility; the granulation tissue is peeled from the thread surfaces with titanium-tipped instruments. The exposed, contaminated threads are decontaminated — citric acid held against the surface for a minute, then copious saline — and, because the defect has a deep intrabony component on the mesial and exposed threads facially, both arms of the fork are used: implantoplasty of the facially exposed threads to a smooth, cleansable surface, and xenograft condensed into the mesial defect under a collagen membrane. The flap is replaced to cover the graft. He leaves with a maintenance contract — three-monthly reviews with radiographs annually — because this disease is managed like periodontitis, for life.
Where students slip
Three slips recur in answers. The first is diagnostic: describing a mobile, pus-filled implant as amenable to regenerative surgery — mobility means the end-stage, and removal is the only correct verb; the integrated implant with deep pockets is the regenerative candidate. The second is instrument choice: debriding titanium with steel curettes or ultrasonic steel tips damages the surface oxide layer and smear layer that decontamination is meant to restore — plastic, titanium or carbon-fibre instruments are the expected answer. The third is overpromising: examiners increasingly reward the candidate who says the ideal decontamination method is unproven and that resective surgery trades bone for cleansability — predictable but subtractive — while regenerative results depend on defect anatomy. Indian exam convention frames this as a short note, "peri-implantitis — definition and management", and the marks separate precisely at the mucositis-versus-peri-implantitis line and the mobile-implant removal rule.
Frequently asked questions
How do mucositis and peri-implantitis differ?
Mucositis is reversible soft-tissue inflammation around an implant with no bone loss; peri-implantitis adds progressive supporting bone loss, and mobility appears only at end-stage.
Which agents are used to decontaminate the implant surface?
Citric acid, tetracycline paste, copious saline irrigation, glycine air-polishing, and Er:YAG or photodynamic therapy, with plastic or titanium instruments instead of steel.
When is resective surgery preferred over regenerative?
Horizontal, non-aesthetic defects where cleansability matters more than bone height — implantoplasty and apical flap positioning produce a maintainable but lower contour.
When must the implant be removed?
When it is mobile, has lost most of its circumferential support, or has an infection that persists despite surgical therapy — removal, grafting and later replacement.
What maintenance follows peri-implantitis surgery?
Supportive peri-implant care every three to four months with hygiene reinforcement and annual radiographs, since recurrence is common and prior periodontitis is the strongest risk.