Direct answer

Dental implants can fail early when stable bone integration does not develop, or later after they have functioned. Causes are often multifactorial and may include infection, impaired healing, unfavorable anatomy or placement, excessive loading, peri-implantitis, component problems, or fracture. A failed implant needs diagnosis—not an assumption based on material alone.

Key takeaways

  • Early failure and late failure usually have different clinical contexts.
  • Failure may be biological, mechanical, restorative, or a combination.
  • One risk factor rarely explains every case.
  • Retreatment should follow investigation of modifiable causes.

Early failure: integration does not establish

An early failure occurs before reliable osseointegration or functional restoration. Contributing factors can include infection, inadequate initial stability, excessive movement during healing, compromised bone, thermal or surgical trauma, systemic healing risk, nicotine exposure, or loading beyond what the site can tolerate. Sometimes no single cause can be proven.

Late failure: support is lost after function

Later problems may involve plaque-associated peri-implantitis and progressive bone loss, unfavorable loading, restoration or component complications, implant fracture, or a combination of biological and mechanical factors. Comparing current findings with baseline probing and radiographs is important.

How a suspected failure is evaluated

The clinician may assess mobility, pain, swelling, drainage, probing findings, bite contacts, the restoration and connection, serial imaging, hygiene access, health changes, and trauma or grinding. A loose crown or abutment is not automatically a failed implant; conversely, minimal discomfort does not rule out progressive disease.

What happens after failure?

Management depends on the diagnosis and may include treating inflammation, repairing a restoration, unloading the site, removing the implant, rebuilding bone or soft tissue, monitoring healing, and reconsidering implant or non-implant options. Replacing an implant without addressing relevant causes can repeat the same risk.

Selected references

  1. Berglundh T, et al. Peri-implant diseases and conditions: Consensus report of workgroup 4 of the 2017 World Workshop. Journal of Periodontology. 2018. doi:10.1002/JPER.17-0739.
  2. Herrera D, et al. Prevention and treatment of peri-implant diseases—The EFP S3 level clinical practice guideline. Journal of Clinical Periodontology. 2023. doi:10.1111/jcpe.13823.