Clinical evaluation of polyacid-modified resin composite posterior restorations: One-year results

Objective: The aim of this investigation was to evaluate the clinical perfo rmance of a new compomer restorative system, Dyract AP, placed in combinati on with Non-Rinse Conditioner and Prime & Bond NT in permanent posterior te eth. Method and materials: Fifty Class II and 41 Class I restorations were placed in 39 patients by 1 dentist. The restorations were evaluated directl y, with modified US Public Health Service criteria, and indirectly, with co lor slides and polyvinyl siloxane impressions, at baseline and 6 months aci d 1 year after placement. Preoperative and 1-year postoperative bitewing ra diographs were also taken. Results: All 82 restorations available for 1-yea r 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 criter ion were color match, 95.1%; marginal discoloration, 57.3%; marginal integr ity, 35.4%; anatomic form, 98.8%; and surface texture, 91.5%. The average w ear rate of Dyract AP was low (18.5 +/- 11.7 mum at 6 months and 35.7 +/- 1 3.6 mum at 12 months). Conclusion: The excellent handling characteristics, the good clinical performance, and the improved wear resistance suggest tha t this compomer will provide reliable direct tooth-colored restorations in stress-bearing areas.