title: Clinical evaluation of Dyract AP restorative in permanent molars: 2-year results.
abstract: OBJECTIVE
  To evaluate the clinical behavior of a 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 in a dental teaching hospital. The restorations were evaluated directly at baseline and after 6, 12 and 24 months using the modified USPHS-Ryge criteria. Clinical photographs, polyvinylsiloxane impressions and bitewing radiographs of each restoration were taken for indirect assessment.
  
  
  RESULTS
  After 2 years, all 76 restorations were evaluated in situ. Color matching ability and surface characteristics were excellent. A gradual deterioration in marginal discoloration and marginal integrity was noted. The percentages of Alfa scores for each criterion at the 24-month evaluation were: color match 96%, marginal discoloration 50%, marginal integrity 26%, anatomic form 97% and surface texture 95%. Five of the restorations (6%) had experienced partial fracture or recurrent caries. After 6, 12 and 24 months, the net mean occlusal wear values were 18.5 microm, 35.7 microm and 55.9 microm, respectively. There was no statistically significant difference between Class I and II restorations for each criterion (Fisher's exact test, P > 0.05).
authors.affiliation: Faculty of Dentistry, The University of Hong Kong.
authors.forename: Yan
authors.initials: Y
authors.lastname: Luo
authors.forename: Edward C M
authors.initials: EC
authors.lastname: Lo
authors.forename: Daniel T S
authors.initials: DT
authors.lastname: Fang
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Smales
authors.forename: Stephen H Y
authors.initials: SH
authors.lastname: Wei
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001641:Bicuspid; D020770:Compomers; D003731:Dental Caries / Q000209:etiology; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D017220:Dentin-Bonding Agents; D019229:Dentition, Permanent; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008298:Maleates; D008963:Molar; D011109:Polymethacrylic Acids; D012008:Recurrence; D013499:Surface Properties; D014075:Tooth Discoloration / Q000209:etiology
chemical_list: D020770:Compomers; D017220:Dentin-Bonding Agents; C088486:Dyract; D008298:Maleates; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; C444699:non-rinse conditioner