The aim of this study is to evaluate the influence of periodontal care response on long term dental implant success. Investigator's hypothesis is that patients who do not well respond to periodontal care have more chance to develop peri-implant complications at long-term. The second purpose of this study is to evaluate the influence of other local, systemic, behavioral, and implant's related risk factors

Inclusion Criteria:

Patient attending supporting periodontal therapy with at least one implant placed for more than 3 years

• Patient with more than 12 teeth at baseline
• Patient with demographic, periodontal, implant data recording
• patient aged >30 years at Baseline

Exclusion criteria:

• Patient needed antibiotic prophylaxis
• Uncontrolled diabetes
• Systemic inflammatory or autoimmune diseases

Patient attending periodontal and implant treatment at the Department of Periodontology of the Dental Faculty at Strasbourg, France, between 2000-2015.