title: Clinical evaluation of polyacid-modified resin composite posterior restorations: one-year results.
abstract: OBJECTIVE
  The aim of this investigation was to evaluate the clinical performance of a new compomer restorative system, Dyract AP, placed in combination with Non-Rinse Conditioner and Prime & Bond NT in permanent posterior teeth.
  
  
  METHODS
  Fifty Class II and 41 Class I restorations were placed in 39 patients by 1 dentist. The restorations were evaluated directly, with modified US Public Health Service criteria, and indirectly, with color slides and polyvinyl siloxane impressions, at baseline and 6 months and 1 year after placement. Preoperative and 1-year postoperative bitewing radiographs were also taken.
  
  
  RESULTS
  All 82 restorations available for 1-year evaluation were in situ. No postoperative sensitivity or pulpal problems were reported. Four Class II restorations (4.9%) failed because of partial fracture or recurrent caries. The percentages of Alfa score for each criterion were color match, 95.1%; marginal discoloration, 57.3%; marginal integrity, 35.4%; anatomic form, 98.8%; and surface texture, 91.5%. The average wear rate of Dyract AP was low (18.5 +/- 11.7 microns at 6 months and 35.7 +/- 13.6 microns at 12 months).
  
  
  CONCLUSIONS
  The excellent handling characteristics, the good clinical performance, and the improved wear resistance suggest that this compomer will provide reliable direct tooth-colored restorations in stress-bearing areas.
authors.affiliation: University of Hong Kong, Faculty of Dentistry, Hong Kong.
authors.forename: Y
authors.initials: Y
authors.lastname: Luo
authors.forename: E C
authors.initials: EC
authors.lastname: Lo
authors.forename: D T
authors.initials: DT
authors.lastname: Fang
authors.forename: S H
authors.initials: SH
authors.lastname: Wei
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000293:Adolescent; D000328:Adult; D001641:Bicuspid; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D016009:Chi-Square Distribution; D003116:Color; D020770:Compomers / Q000737:chemistry*; D003731:Dental Caries / Q000209:etiology; D003760:Dental Impression Materials; D018772:Dental Marginal Adaptation; D003788:Dental Pulp Diseases / Q000209:etiology; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods*; D003807:Dentin Sensitivity / Q000209:etiology; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008689:Methacrylates / Q000737:chemistry*; D008875:Middle Aged; D008963:Molar; D011109:Polymethacrylic Acids / Q000737:chemistry; D011145:Polyvinyls; D016300:Radiography, Bitewing; D012008:Recurrence; D017640:Silicates / Q000737:chemistry*; D012833:Siloxanes; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D020770:Compomers; D003760:Dental Impression Materials; D017220:Dentin-Bonding Agents; C088486:Dyract; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011145:Polyvinyls; C103500:Prime & Bond; D017640:Silicates; D012833:Siloxanes; C034183:vinyl polysiloxane; D017438:Bisphenol A-Glycidyl Methacrylate