title: Five-year clinical performance of posterior resin composite restorations placed by dental students.
abstract: OBJECTIVE
  To investigate the survival over a five-year period of posterior resin composite restorations placed by students.
  
  
  METHODS
  Class I and II resin composite restorations placed by second-fourth year dental students were evaluated. Patients attended the dental school every 6 months for a regular check-up during which all restorations were checked on their clinical acceptability. In case of replacement or repair of a restoration, this was registered in the patient's record. From each record the survival time and reasons for failure of resin composite restorations were gathered.
  
  
  RESULTS
  Seven-hundred three posterior resin composite restorations in 382 patients (49% female and 51% male, age 22-78) were evaluated. At 5 years 560 of the 703 restorations were still considered to be "clinically acceptable". Forty-nine restorations were considered as "functionally present", of which 44 were restored with a crown and four had received a new restoration adjacent to the existing restoration without its removal. Ninety-four restorations had failed. The main reasons for failure were restoration fracture, caries, endodontic treatment, defective margin and lack of proximal contact. The survival rate of the restorations was 87% at 5 years, resulting in an annual failure rate of 2.8%.
  
  
  CONCLUSIONS
  Dental students are able to place resin composite restorations in posterior teeth with an acceptable mean annual failure rate.
authors.affiliation: Department of Cariology and Endodontology, University Medical Centre Nijmegen, P.O. Box 9101, HB Nijmegen 6500, The Netherlands. n.opdam@dent.umcn.nl
authors.forename: N J M
authors.initials: NJ
authors.lastname: Opdam
authors.forename: B A C
authors.initials: BA
authors.lastname: Loomans
authors.forename: F J M
authors.initials: FJ
authors.lastname: Roeters
authors.forename: E M
authors.initials: EM
authors.lastname: Bronkhorst
mesh_terms: D000328:Adult; D000368:Aged; D016009:Chi-Square Distribution; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D003731:Dental Caries / Q000628:therapy; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000145:classification; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012390:Root Canal Therapy; D013335:Students, Dental; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome
chemical_list: D003188:Composite Resins