Dental implants have one of the highest long-term success rates of any procedure in medicine — regularly reported at 94–97% at ten years. But failure does happen, and when it does, understanding why matters both for salvaging the case and preventing repeat failures.

The Two Categories of Failure

Early failure occurs before the implant integrates with bone — typically within the first 3–6 months. Late failure occurs after successful integration, often years later. The causes are different.

1. Peri-implantitis

The implant equivalent of gum disease. Bacterial biofilm accumulates around the implant neck, inflammation progresses, and bone is lost. Left untreated, peri-implantitis will eventually loosen the implant. It is the leading cause of late implant failure.

2. Occlusal Overload

Dental implants do not have a periodontal ligament, so they cannot absorb excessive biting forces the way natural teeth can. Bruxism (grinding), a poorly balanced bite, or a prosthesis designed with premature contacts will eventually cause the implant to lose bone support or the prosthetic to fracture.

3. Surgical Compromise

Implants placed in insufficient bone, at suboptimal angles, too close to adjacent teeth, or with inadequate primary stability are more likely to fail early. This is where operator experience matters most — and why placement by an experienced prosthodontist or oral surgeon, ideally using CBCT-guided planning, correlates strongly with better long-term outcomes.

4. Medical and Systemic Factors

Uncontrolled diabetes (HbA1c > 8.0)
Bisphosphonate and antiresorptive medications (especially IV formulations)
Head and neck radiation
Active autoimmune disease
Chronic heavy smoking

5. Smoking

Heavy smokers have 2–3× the implant failure rate of non-smokers. Nicotine causes vasoconstriction that impairs healing, and the byproducts of combustion create a chronic inflammatory insult to peri-implant tissues.

6. Poor Prosthetic Design

An implant can be beautifully placed and still fail prosthetically. Ill-fitting crowns, poorly designed emergence profiles, excessive cantilevers on full-arch prosthetics, and cement left subgingivally are all common contributors to late failure.

Can a Failing Implant Be Saved?

Often, yes. Peri-implantitis caught early can be treated with surgical debridement and sometimes regenerative therapy. Prosthetic problems can be redesigned. Failed implants can often be removed, the site regenerated, and a new implant placed. Our practice handles implant failure salvage and revision cases from across New England.

If you have concerns about an implant placed elsewhere, request a second-opinion consultation.

Serving Patients Across Greater Boston

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