title: Three-year clinical evaluation of a polyacid-modified resin composite in minimally invasive occlusal cavities.
abstract: OBJECTIVE
  The aim of this study was to evaluate the 3-year clinical performance of one polyacid-modified resin composite material (PMRC). Dyract, in minimally invasive occlusal cavities and its neighbouring fissures.
  
  
  METHODS
  One hundred and sixteen restorations of the material investigated were placed by a single operator in a group of selected children under controlled conditions. Isolation of the restorations was accomplished with the use of cotton rolls and aspiration. Using modified US Public Health Service (USPHS) codes and criteria, the restorations were reviewed clinically within 1 week of placement (baseline), and thereafter at 6 months, 1, 2 and 3 years.
  
  
  RESULTS
  After 3 years, marginal discolouration was present in 8.6% of the restorations. The marginal adaptation was rated as partly sealed (Oscar-Alpha) in 107 (92.2) of the restorations. Five restorations had lost their sealant components, while four restorations were partly sealed with explorer-catch after 3 years. Although wear of the restorations was considerable, restorations rated as 'partly sealed' had at least two-thirds of their sealant components fully retained. Recurrent caries was associated with four (3.4%) restorations.
  
  
  CONCLUSIONS
  In this clinical study, the retention rate of the tested PMRC material was good, although a marked occlusal wear was evident. The marginal adaptation of the PMRC at the enamel site would probably have been better by the use of enamel-etching. Provided the marginal adaptation and wear resistance of the material is further improved, clinical use of PMRCs in minimally invasive occlusal cavities can be advocated.
authors.affiliation: Department of Paedodontics, Hacettepe University, Faculty of Dentistry, Ankara, Turkey. zaferc@hotmail.com
authors.forename: Z C
authors.initials: ZC
authors.lastname: Cehreli
authors.forename: N
authors.initials: N
authors.lastname: Altay
mesh_terms: D002648:Child; D020770:Compomers / Q000627:therapeutic use*; D003731:Dental Caries / Q000628:therapy; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear / Q000706:statistics & numerical data; D003793:Dental Restoration, Permanent / Q000379:methods / Q000706:statistics & numerical data; D005500:Follow-Up Studies; D006801:Humans; D008689:Methacrylates / Q000627:therapeutic use*; D017640:Silicates / Q000627:therapeutic use*; D018709:Statistics, Nonparametric; D013997:Time Factors; D014075:Tooth Discoloration / Q000453:epidemiology
chemical_list: D020770:Compomers; C088486:Dyract; D008689:Methacrylates; D017640:Silicates