title: The long-term effect of a composite resin restoration on proximal contact tightness.
abstract: OBJECTIVE
  The aim of this study was to investigate changes in proximal contact tightness up to 6 months after the restorative treatment.
  
  
  METHODS
  In a randomised clinical trial Class II composite resin restorations were placed in 52 patients. Proximal contact tightness was measured before, directly after, and 6 months after treatment. These data were analysed statistically using linear regression and t-tests.
  
  
  RESULTS
  Proximal contacts, that increased in tightness as result of the treatment tend to loose tightness after a 6-months period but remain tighter than before treatment. Proximal contacts, that decreased after treatment hardly change after 6 months.
  
  
  CONCLUSIONS
  A change in contact tightness after restorative treatment will not always remain stable over time.
authors.affiliation: Department of Preventive and Restorative Dentistry, Radboud University Nijmegen Medical Centre, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands. b.loomans@dent.umcn.nl
authors.forename: B A C
authors.initials: BA
authors.lastname: Loomans
authors.forename: N J M
authors.initials: NJ
authors.lastname: Opdam
authors.forename: F J M
authors.initials: FJ
authors.lastname: Roeters
authors.forename: E M
authors.initials: EM
authors.lastname: Bronkhorst
authors.forename: A J M
authors.initials: AJ
authors.lastname: Plasschaert
mesh_terms: D000328:Adult; D000368:Aged; D003188:Composite Resins / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000145:classification* / Q000295:instrumentation; D005260:Female; D005500:Follow-Up Studies; D017276:Friction; D006801:Humans; D008297:Male; D008434:Matrix Bands; D008689:Methacrylates / Q000737:chemistry; D008875:Middle Aged; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties; D013997:Time Factors
chemical_list: C112828:Clearfil AP-X; C438313:Clearfil SE Bond; D003188:Composite Resins; D008689:Methacrylates; D019279:Resin Cements; C074669:Clearfil Photo Bond