Inclusion Criteria:  Adults> 18 years old. Patients who have placed one or more implants in the last five years at the Departments of Periodontology or Oral Surgery of the FMD and the implants have / have been loaded. Patients whose periodontal file has been completed and the periodontal parameters required for IDRA reported. Patients having an x-ray with the loaded implant or an x-ray during the try-in of the infrastructure.  Exclusion Criteria:  Patients with incomplete periodontal charts and missing parameters related to IDRA. Patients not having an x-ray after loading the implant or during the try-in of the infrastructure Totally edentulous patients.