title: Prevalence of peri-implantitis in patients not participating in well-designed supportive periodontal treatments: a cross-sectional study.
abstract: OBJECTIVE
  This retrospective cross-sectional study aimed to evaluate the prevalence of biologic complications of implants in patients treated by fixed implant supported prosthesis without regular maintenance program.
  
  
  METHODS
  One hundred thirty-four patients with 478 implants, installed during a 10-year period (2001-2010), were recruited for clinical and radiographic follow-up examinations. The periodontal and implant health status were assessed to determine the prevalence of peri-implant diseases.
  
  
  RESULTS
  The mean ± SD loading time for implants was 4.43 ± 2.25 years. Fifty-five percentage of the implants were tissue-level implants. Peri-implantitis was diagnosed in 20% of patients and 8.8% of implants. Subject-based and implant-based prevalence of mucositis amounted to 48.5% and 40%, respectively. Mean crestal bone loss in tissue-level and bone-level implants were 0.28 ± 0.53 mm and 1.37 ± 1.5 mm, respectively. Smoking and lack of keratinized mucosa was associated with peri-implantitis at an odds ratio of OR = 2.57 and 3.89, respectively.
  
  
  CONCLUSIONS
  After a 5-year period of loading without any regular maintenance program, one out of five patients would experience peri-implantitis. Tissue-level implants had lower values of peri-implantitis prevalence and crestal bone loss.
authors.affiliation: Dental Implant Research Center, Dentistry Research Institute, Periodontics Department, Tehran University of Medical Science, Tehran, Iran.
authors.forename: Amirreza
authors.initials: A
authors.lastname: Rokn
authors.affiliation: Periodontics department, Dental Faculty, Tehran University Of Medical Science, Tehran, Iran.
authors.forename: Hoori
authors.initials: H
authors.lastname: Aslroosta
authors.affiliation: Dental Implant Research Center, Dentistry Research Institute, Tehran University of Medical Science, Tehran, Iran.
authors.forename: Solmaz
authors.initials: S
authors.lastname: Akbari
authors.affiliation: Dental Implant Research Center, Dentistry Research Institute, Tehran University of Medical Science, Tehran, Iran.
authors.forename: Hossein
authors.initials: H
authors.lastname: Najafi
authors.affiliation: Department of Biostatistics, Proteomics Research Center and Department of Biostatistics, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Farid
authors.initials: F
authors.lastname: Zayeri
authors.affiliation: Dental Implant Research Center, Dentistry Research Institute, Tehran University of Medical Science, Tehran, Iran.
authors.forename: Kazem
authors.initials: K
authors.lastname: Hashemi
mesh_terms: D003430:Cross-Sectional Studies; D017267:Dental Prosthesis Design; D019094:Dental Prosthesis, Implant-Supported / Q000009:adverse effects*; D006801:Humans; D057873:Peri-Implantitis / Q000453:epidemiology*; D015995:Prevalence; D012189:Retrospective Studies; D012307:Risk Factors
keywords: maintenance; mucositis; peri-implantitis; prevalence