title: Restorative material and other tooth-specific variables associated with the decision to repair or replace defective restorations: findings from The Dental PBRN.
abstract: OBJECTIVE
  Using data from dentists participating in The Dental Practice-Based Research Network (DPBRN), the study had 2 main objectives: (1) to identify and quantify the types of restorative materials in the existing failed restorations; and (2) to identify and quantify the materials used to repair or replace those failed restorations.
  
  
  METHODS
  This cross-sectional study used a consecutive patient/restoration recruitment design. Practitioner-investigators recorded data on consecutive restorations in permanent teeth that needed repair or replacement. Data included the primary reason for repair or replacement, tooth surface(s) involved, restorative materials used, and patient demographics.
  
  
  RESULTS
  Data for 9875 restorations were collected from 7502 patients in 197 practices for which 75% of restorations were replaced and 25% repaired. Most of the restorations that were either repaired or replaced were amalgam (56%) for which most (56%) of the material used was direct tooth-coloured. The restorative material was 5 times more likely to be changed when the original restoration was amalgam (OR=5.2, p<.001). The likelihood of changing an amalgam restoration differed as a function of the tooth type (OR=3.0, p<.001), arch (OR=6.6, p<.001); and number of surfaces in the original restoration (OR=12.2, p<.001).
  
  
  CONCLUSIONS
  The probability of changing from amalgam to another restorative material differed with several characteristics of the original restoration. The change was most likely to take place when (1) the treatment was a replacement; (2) the tooth was not a molar; (3) the tooth was in the maxillary arch; and (4) the original restoration involved a single surface.
authors.affiliation: Department of Restorative Dental Sciences, Operative Dentistry Division, University of Florida, College of Dentistry, Gainesville, FL 32610-0415, USA. vgordan@dental.ufl.edu
authors.forename: Valeria V
authors.initials: VV
authors.lastname: Gordan
authors.forename: Joseph L
authors.initials: JL
authors.lastname: Riley
authors.forename: Donald C
authors.initials: DC
authors.lastname: Worley
authors.forename: Gregg H
authors.initials: GH
authors.lastname: Gilbert
mesh_terms: D001641:Bicuspid / Q000473:pathology; D055812:Community-Based Participatory Research; D003188:Composite Resins / Q000737:chemistry; D003430:Cross-Sectional Studies; D003481:Cuspid / Q000473:pathology; D003723:Dental Amalgam / Q000737:chemistry; D003737:Dental Cavity Preparation / Q000145:classification; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design / Q000145:classification; D017269:Dental Prosthesis Repair / Q000145:classification / Q000706:statistics & numerical data; D019232:Dental Restoration Failure / Q000706:statistics & numerical data; D003793:Dental Restoration, Permanent / Q000145:classification / Q000706:statistics & numerical data; D005260:Female; D005899:Glass Ionomer Cements / Q000737:chemistry; D006047:Gold Alloys / Q000737:chemistry; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D008334:Mandible; D008437:Maxilla; D016876:Metal Ceramic Alloys / Q000737:chemistry; D008875:Middle Aged; D008963:Molar / Q000473:pathology; D019279:Resin Cements / Q000737:chemistry; D019233:Retreatment
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D005899:Glass Ionomer Cements; D006047:Gold Alloys; D016876:Metal Ceramic Alloys; D019279:Resin Cements; D003723:Dental Amalgam