title: The survival of Class V restorations in general dental practice: part 3, five-year survival.
abstract: OBJECTIVE
  To evaluate the survival over five years of Class V restorations placed by UK general practitioners, and to identify factors associated with increased longevity.
  
  
  METHODS
  Prospective longitudinal cohort multi-centre study.
  
  
  METHODS
  UK general dental practices.
  
  
  METHODS
  Ten general dental practitioners each placed 100 Class V restorations of varying sizes, using a range of materials and recorded selected clinical information at placement and recall visits. After five years the data were analysed using the Kaplan-Meier method, log-rank tests and Cox regressions models to identify significant associations between the time to restoration failure and different clinical factors.
  
  
  RESULTS
  After five years 275/989 restorations had failed (27.8%), with 116 (11.7%) lost to follow-up. Cox regression analysis identified that, in combination, the practitioner, patient age, cavity size, moisture contamination and cavity preparation were found to influence the survival of the restorations.
  
  
  CONCLUSIONS
  At least 60.5% of the restorations survived for five years. The time to failure of Class V restorations placed by this group of dentists was reduced in association with the individual practitioner, smaller cavities, glass ionomer restorations, cavities which had not been prepared with a bur, moisture contamination, increasing patient age, cavities confined to dentine and non-carious cavities.
authors.affiliation: Conservative Dentistry, University of Birmingham School of Dentistry, St Chads Queensway, Birmingham, B4 6NN. d.a.stewardson@bham.ac.uk
authors.forename: D
authors.initials: D
authors.lastname: Stewardson
authors.forename: S
authors.initials: S
authors.lastname: Creanor
authors.forename: P
authors.initials: P
authors.lastname: Thornley
authors.forename: T
authors.initials: T
authors.lastname: Bigg
authors.forename: C
authors.initials: C
authors.lastname: Bromage
authors.forename: A
authors.initials: A
authors.lastname: Browne
authors.forename: D
authors.initials: D
authors.lastname: Cottam
authors.forename: D
authors.initials: D
authors.lastname: Dalby
authors.forename: J
authors.initials: J
authors.lastname: Gilmour
authors.forename: J
authors.initials: J
authors.lastname: Horton
authors.forename: E
authors.initials: E
authors.lastname: Roberts
authors.forename: L
authors.initials: L
authors.lastname: Westoby
authors.forename: T
authors.initials: T
authors.lastname: Burke
mesh_terms: D000367:Age Factors; D015331:Cohort Studies; D003737:Dental Cavity Preparation; D003764:Dental Materials; D019232:Dental Restoration Failure / Q000706:statistics & numerical data*; D003793:Dental Restoration, Permanent / Q000379:methods*; D005260:Female; D005792:General Practice, Dental; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D016016:Proportional Hazards Models; D016019:Survival Analysis
chemical_list: D003764:Dental Materials