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Titanium and Iron elements were found in soft and hard tissue biopsies retrieved from peri-implantitis sites. Further histologic and immunohistochemical studies need to clarify which specific immune reaction metal elements/particles induce in dental peri-implant tissue.

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Dental implants in oral cancer patients who had been treated by ablative surgery show a high and steady cumulative survival rate after 11 years. Implant survival of patients with additional RCT is significantly lower. Non-smoking-irradiated patients seem to have a better implant survival.