To investigate the patient-related risk factors for peri-implant disease in partially edentulous patients rehabilitated with implants supported crown or bridge so as to provide evidence for clinical prevention and control.

Objective: To investigate the patient-related risk factors for peri-implant disease in partially edentulous patients rehabilitated with implants supported crown or bridge so as to provide evidence for clinical prevention and control. Methods:A total of 131 patients will enroll in the study. Univariate and multivariate logistic regression analysis is used to determine the patient factors associated with peri-implant disease. The variables include age, gender, smoking and alcohol consumption, presence of diabetes, cardiovascular disease, osteoporosis, bruxism, bleeding upon brushing, reason for extraction, oral hygiene and periodontal status.

Inclusion Criteria:

Patients implanted at least one implant and restored with implant-supported fixed partial dentures and single crowns.

The implant-supported fixed partial dentures and single crowns were in function at least one year.

Exclusion Criteria:

Jaw radiotherapy treatment before and after implanting. Patients who have bruxism, xerostomia or the adjacent teeth periapical periodontitis.

Patients who suffered with oral mucosa disease,or aggressive periodontitis or jaw defect.

Patients who suffered with mental and psychological disease will influence their oral health normal maintenance.

Patients restored with implant-supported fixed partial dentures and single crowns at the Department of Prosthodontics, School of Stomatology of the Fourth Military Medical University between January 2011 to May 2014.