title: Clinical effectiveness of a low-shrinkage resin composite: a five-year evaluation.
abstract: OBJECTIVE
  To study the durability of a recently developed low-shrinkage resin composite, suggested to counter the stress formation in direct resin composite restorations.
  
  
  METHODS
  Each of 50 patients received one or two pair(s) of Class II restorations. The first restoration in the pair was a low-shrinkage resin composite (InTen-S) and the second a hybrid resin composite restoration (Point 4). Both restorations were placed with an etch-and-rinse bonding system and an oblique layering technique. A total of 106 restorations, 33 premolar and 73 molars, were placed. The restorations were evaluated annually.
  
  
  RESULTS
  At 5 years, 97 restorations were evaluated. Two participants reported slight postoperative sensitivity symptoms for a few weeks after placement. Twelve non acceptable restorations were observed during the 5 years, five InTen-S (10.4%) and 7 Point 4 (14.3%) (not significant). Secondary caries was the main reason for failure (8) followed by composite fracture (2) and tooth fracture (2).
  
  
  CONCLUSIONS
  The low-shrinkage resin composite showed good durability, but not significantly better than the control resin composite in Class II cavities. Most failures occurred at the last part of the study. Secondary caries was the main reason for failure.
authors.affiliation: Department of Odontology, Dental School Umeå, Umeå University, Umeå, Sweden. Jan.van.Dijken@odont.umu.se
authors.forename: Jan W V
authors.initials: JW
authors.lastname: van Dijken
authors.forename: Anders
authors.initials: A
authors.lastname: Lindberg
mesh_terms: D000293:Adolescent; D000328:Adult; D017438:Bisphenol A-Glycidyl Methacrylate / Q000009:adverse effects; D003188:Composite Resins / Q000009:adverse effects / Q000737:chemistry; D003731:Dental Caries / Q000209:etiology; D003737:Dental Cavity Preparation / Q000379:methods; D003763:Dental Leakage / Q000209:etiology; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D003799:Dental Stress Analysis; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D055815:Young Adult
chemical_list: D003188:Composite Resins; C485362:InTen-S composite; C451741:point 4 composite resin; D017438:Bisphenol A-Glycidyl Methacrylate