Implant complications
A systematic approach to diagnosis and treatment planning when an implant has failed or is failing. By Dr. Gaetano Calesini, prosthodontist.
Failed dental implants require a systematic diagnostic assessment before any treatment decision is made. The appropriate course depends on the cause of failure: biomechanical overload, peri-implantitis, bone loss, prosthetic misfit, or surgical error. In selected cases implants are removed and replaced after proper healing; in others, decontamination and bone augmentation may be indicated. A second opinion from a specialist in implant prosthetics is advisable before accepting any proposed solution.
Most failed implants are treated before the cause of failure is identified. This is the reason many second failures follow the first. Before any intervention, a structured causal analysis is required: a systematic review of the clinical history, existing radiographs, the occlusal scheme, the prosthetic design, the patient’s systemic health, and the surgical record where available.
The cause determines the treatment. Removing and replacing a failed implant without addressing the underlying cause will reproduce the failure.
The most common cause of late implant failure. Peri-implantitis is an inflammatory condition of the tissues surrounding the implant, driven by bacterial colonisation. It produces progressive bone loss. Early detection and management can preserve the implant in selected cases; advanced peri-implantitis with significant bone loss typically warrants removal.
Implants placed in an occlusal scheme that generates destructive forces will fail, regardless of integration quality or implant brand. Bruxism, parafunctional habits, and poorly designed prosthetic components are the main drivers. This cause is entirely preventable with proper pre-treatment occlusal analysis.
Incorrect implant positioning, inadequate bone preparation, contamination at the time of surgery, or a prosthetic superstructure that does not fit the implant body are all causes of failure that originate in the treatment itself. Identifying these requires a clinical review of the available documentation.
Uncontrolled diabetes, immunosuppression, bisphosphonate therapy, heavy smoking, and radiation therapy to the jaw are risk factors that may cause or contribute to failure. In many cases, these were not properly evaluated before the implant was placed.
After a failed implant is removed, the treatment sequence depends on what is found. If the site is infection-free and residual bone is adequate, a new implant may be placed immediately in selected cases. More frequently, the site requires a healing period of four to six months before reassessment.
Where bone loss has occurred, augmentation procedures (guided bone regeneration, block grafting, or sinus lift) may be required before a new implant is considered. The total timeline from removal to definitive restoration in these cases ranges from twelve to eighteen months. Any timeline significantly shorter than this, in the presence of bone loss or prior infection, should be examined critically.
Before accepting any proposed treatment
If your implant has failed or is failing, a second opinion from a specialist in implant prosthetics before committing to any new treatment is not a delay: it is the diagnostic step that makes the next treatment predictable. At Studio Calesini, we regularly evaluate patients referred from other practices, and from other countries, when previous implant treatment has not achieved the expected outcome.
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In most cases, no. Immediate replacement is only appropriate in specific clinical circumstances where there is no infection, adequate residual bone exists, and primary stability can be achieved. In the presence of infection, peri-implantitis, or significant bone loss, the site must be treated and allowed to heal before a new implant is considered.
After implant removal, a healing period of four to six months is typically required before the site can be re-assessed. If bone augmentation is needed, the total timeline from removal to definitive restoration can range from twelve to eighteen months.
Not necessarily. Early and moderate peri-implantitis with limited bone loss may respond to surgical management. Advanced peri-implantitis with significant bone loss, mobility, or persistent suppuration generally warrants implant removal. The decision requires clinical and radiographic assessment on a case-by-case basis.
Signs warranting specialist evaluation include: pain on loading or at rest, bleeding or discharge from the peri-implant sulcus, visible bone loss on recent radiographs, mobility of the implant or crown, and persistent soft tissue swelling. A loose crown alone may reflect a prosthetic component issue rather than implant failure.
No. Patients have the right to seek a second opinion or transfer care to a specialist at any stage. When failure involves significant bone loss, infection, or a complex prosthetic situation, referral to a specialist in implant prosthetics is appropriate and often preferable.