title: A 12-month clinical evaluation of composite resins in class III restorations.
abstract: OBJECTIVE
  This paired-tooth randomized controlled prospective clinical study compared the clinical performance of three composite resins in Class III cavities after 12 months.
  
  
  METHODS
  Three materials were evaluated: a microfilled composite resin (Durafill VS), a hybrid composite resin (Filtek Z250), and a nanofilled composite resin (Filtek Supreme). Thirty-eight patients having at least three Class III restorations were enrolled in this study. A total of 114 restorations were placed by two calibrated operators according to the manufacturers' instructions. The adhesive system (Clearfil SE Bond) was either applied according to manufacturer's instructions (CSE non-etch) or enamel margins were first etched with phosphoric acid (CSE etch). One week later, the restorations were finished and polished. Two other independent examiners evaluated the restorations at baseline according to the USPHS criteria and USPHS modified criteria for the items color match and surface appearance. The restoration location was taken into consideration during the analysis of each item. A nonparametric analysis of variance (Friedman test) and the Wilcoxon test were used for statistical analysis (alpha = 0.05).
  
  
  RESULTS
  The restoration location did not influence the evaluated items. Filtek Z250 showed the best color match at baseline, and after 6 and 12 months. No significant difference in the item surface appearance was detected at baseline; however, after 6 and 12 months, Filtek Z250 showed the worst performance on this item. No significant difference was found between CSE non-etch and CSE etch groups.
  
  
  CONCLUSIONS
  The hybrid composite resin showed an excellent immediate and 12-month color match, which was superior to the nanofilled and microfilled composites tested. On the other hand, the nanofilled and microfilled composites showed the best surface appearance after 12 months. Additional etching of the enamel cavity margins did not influence the clinical performance of the adhesive Clearfil SE Bond.
authors: Department of Dental Materials and Operative Dentistry, University of Oeste de Santa Catarina, Campus Joaçaba/SC, Brazil. aloguercio@hotmail.com
authors: Alessandro Dourado
authors: AD
authors: Loguercio
authors: Eliane
authors: E
authors: Lorini
authors: Rita Valéria
authors: RV
authors: Weiss
authors: Ana Paula
authors: AP
authors: Tori
authors: Cristhiane Covolan
authors: CC
authors: Picinatto
authors: Neila Rosane
authors: NR
authors: Ribeiro
authors: Alessandra
authors: A
authors: Reis
mesh_terms: D000134:Acid Etching, Dental; D000293:Adolescent; D000328:Adult; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000648:ultrastructure; D018772:Dental Marginal Adaptation; D003775:Dental Polishing; D003793:Dental Restoration, Permanent / Q000145:classification*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D010756:Phosphoric Acids / Q000737:chemistry; D011446:Prospective Studies; D019279:Resin Cements / Q000737:chemistry; D013499:Surface Properties
chemical_list: C438313:Clearfil SE Bond; D003188:Composite Resins; C474035:Filtek Supreme; C444701:Filtek Z250; D010756:Phosphoric Acids; D019279:Resin Cements; C039734:Durafill; C030242:phosphoric acid