title: Bruxism and dental implant treatment complications: a retrospective comparative study of 98 bruxer patients and a matched group.
abstract: OBJECTIVE
  To analyze the complications of dental implant treatment in a group of patients with bruxism in comparison with a matched group of non-bruxers.
  
  
  METHODS
  Patients being diagnosed as bruxers were identified within a group of patients consecutively treated with implant-supported prostheses at one specialist clinic, based on the most recent listed sign and symptoms of bruxism according to the International Classification of Sleep Disorders. A diagnostic grading system of "possible," "probable," and "definite" sleep or awake bruxism was used, according to a recent published international consensus. A case-control matching model was used to match the bruxers with a group of non-bruxers, based on five variables. Implant-, prosthetic-, and patient-related data were collected, as well as 14 mechanical complications, and compared between groups.
  
  
  RESULTS
  Ninety-eight of 2670 patients were identified as bruxers. The odds ratio of implant failure in bruxers in relation to non-bruxers was 2.71 (95% CI 1.25, 5.88). Considering the same number of patients with the same total number of implants equally distributed between groups, the bruxers group had a higher prevalence of mechanical complications in comparison with the non-bruxers group.
  
  
  CONCLUSIONS
  This study suggests that bruxism may significantly increase both the implant failure rate and the rate of mechanical and technical complications of implant-supported restorations. Other risk factors may also have influenced the results.
authors.affiliation: Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
authors.forename: Bruno Ramos
authors.identifier: http://orcid.org/0000-0002-3460-3374
authors.initials: BR
authors.lastname: Chrcanovic
authors.affiliation: Clinic for Prosthodontics, Centre of Dental Specialist Care, Malmö, Sweden.
authors.forename: Jenö
authors.initials: J
authors.lastname: Kisch
authors.affiliation: Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.|Department of Biomaterials, Göteborg University, Göteborg, Sweden.
authors.forename: Tomas
authors.initials: T
authors.lastname: Albrektsson
authors.affiliation: Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden.
authors.forename: Ann
authors.initials: A
authors.lastname: Wennerberg
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002012:Bruxism / Q000150:complications*; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors
chemical_list: D015921:Dental Implants
keywords: bruxism; dental implant; implant failure; mechanical complications; risk factor