The long-term impact of alveolar ridge preservation with xenograft bone mineral on peri-implant health after 5 years in function: A retrospective cohort study of 108 patients assessed clinically and radiologically.

 sites using Bio-Oss®. Smoking is a major risk indicator for peri-implantitis, whereas the association between history of periodontitis and the risk of peri-implantitis, based on this specific, well-maintained cohort and the specific implants used, remains inconclusive.