title: A clinical comparison of resin composite inlay and onlay posterior restorations and cast-gold restorations at 7 years.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the clinical performance of Concept indirect posterior heat- and pressure-polymerized restorative material and compare it to the performance of cast gold.
  
  
  METHODS
  Inlays and onlays placed in a standardized manner as part of a clinical study were evaluated at 7 years. Eighteen patients (45%) who had received 36 Concept restorations returned and were evaluated using the US Public Health Service criteria. Restorations were evaluated in seven categories as the percentage receiving Alfa (ideal), Bravo (clinically acceptable), or Charlie (clinically unacceptable) scores or as restoration no longer present. Fourteen of the restorations were cemented with Heliobond bonding resin and 13 were cemented with Special Bond bonding resin. Each patient also received a cast-gold restoration for comparison.
  
  
  RESULTS
  Concept restorations received scores of Alfa at the following rates: color match, 64%; interfacial staining, 47%; secondary caries, 75%; wear, 58%; marginal integrity, 64%; surface texture, 72%; and axial contour, 58% (in 14% this category was not applicable because they were Class I restorations). Nine Concept restorations (25%) were no longer present. Fifteen of 18 gold restorations were present at this recall. Statistical analysis indicated no significant differences in any categories between the two bonding resins used with Concept restorative material and the gold restorations.
  
  
  CONCLUSIONS
  At 7 years in vivo, the Concept indirect posterior restorative system yields clinically acceptable restorations, particularly in premolars.
authors.affiliation: Department of Pediatric Dentistry, College of Dentistry, University of Iowa, Iowa City 52242, USA. Kdonly357@aol.com
authors.forename: K J
authors.initials: KJ
authors.lastname: Donly
authors.forename: M E
authors.initials: ME
authors.lastname: Jensen
authors.forename: P
authors.initials: P
authors.lastname: Triolo
authors.forename: D
authors.initials: D
authors.lastname: Chan
mesh_terms: D000179:Acrylates; D000328:Adult; D001641:Bicuspid; D016009:Chi-Square Distribution; D003188:Composite Resins; D003738:Dental Cements; D005500:Follow-Up Studies; D006047:Gold Alloys; D006801:Humans; D007284:Inlays / Q000379:methods*; D008875:Middle Aged; D008963:Molar
chemical_list: D000179:Acrylates; D003188:Composite Resins; C069352:Concept resin; D003738:Dental Cements; D006047:Gold Alloys; C086660:Special Bond 2 dental cement; C040415:heliobond