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Implants · single question

All of the following are reasons for implant failure EXCEPT:

  1. Uncontrolled diabetes
  2. Periapical pathology on an adjacent tooth
  3. The implant did not reach occlusion at initial placement
  4. Smoking
Show answer and explanation

Correct answer: C. The implant did not reach occlusion at initial placement

  • A. Uncontrolled diabetes impairs healing, immune response, and osseointegration — a major failure risk.
  • B. Periapical pathology (retrograde peri-implantitis from adjacent infected teeth) can cause implant failure.
  • C. Implants are NOT placed in occlusion initially — submerged (non-functional) healing is standard protocol. An implant not in occlusion during healing is EXPECTED and is NOT a cause of failure. This is the correct exception.
  • D. Smoking significantly impairs osseointegration and is a major implant failure risk factor.

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