title: The survival of Class V restorations in general dental practice. Part 2, early failure.
abstract: OBJECTIVE
  To evaluate Class V restorations placed by UK general practitioners comparing those failing or surviving after two years, and to identify factors associated with early failure.
  
  
  METHODS
  Prospective longitudinal cohort multi-centre study. Setting UK general dental practices.
  
  
  METHODS
  Ten dentists each placed 100 Class V restorations and recorded selected clinical information at placement and recall visits. Univariate associations were assessed between recorded clinical factors and whether restorations had failed or not at two years. Multi-variable binary logistic regression was also undertaken to identify which combination of factors had a significant effect on the probability of early failure.
  
  
  RESULTS
  At two years, 156 of 989 restorations had failed (15.8%), with 40 (4%) lost to follow-up. Univariate analysis showed a significant association between restoration failure and increasing patient age, payment method, the treating practitioner, non-carious cavities, cavities involving enamel and dentine, cavity preparation and restoration material. Multi-variable analysis indicated a higher probability of early failure associated with the practitioner, older patients, glass ionomer and flowable composite, bur-preparation and moisture contamination.
  
  
  CONCLUSIONS
  Among these practitioners, both analytic methods identified significant associations between early failure of Class V restorations and the practitioner, cavity preparation method, restoration material and patient's age.
authors.affiliation: University of Birmingham School of Dentistry, St Chads Queensway, Birmingham, B4 6NN. d.a.stewardson@bham.ac.uk
authors.forename: D A
authors.initials: DA
authors.lastname: Stewardson
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: S
authors.initials: S
authors.lastname: Creanor
authors.forename: T
authors.initials: T
authors.lastname: Burke
mesh_terms: D000367:Age Factors; D000704:Analysis of Variance; D015331:Cohort Studies; D003188:Composite Resins; D003723:Dental Amalgam; D001840:Dental Bonding / Q000379:methods; D003737:Dental Cavity Preparation / Q000379:methods; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000145:classification / Q000706:statistics & numerical data; D005260:Female; D005792:General Practice, Dental; D005899:Glass Ionomer Cements; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D009911:Oral Hygiene Index; D010350:Patient Credit and Collection / Q000379:methods; D011446:Prospective Studies; D019237:Tooth Cervix
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; D003723:Dental Amalgam