title: Marginal quality of posterior microhybrid resin composite restorations applied using two polymerisation protocols: 5-year randomised split mouth trial.
abstract: OBJECTIVE
  This randomised, split-mouth clinical study evaluated the marginal quality of direct Class I and Class II restorations made of microhybrid composite and applied using two polymerisation protocols, using two margin evaluation criteria.
  
  
  METHODS
  A total of 50 patients (mean age: 33 years) received 100 direct Class I or Class II restorations in premolars or molars. Three calibrated operators made the restorations. After conditioning the tooth with 2-step etch-and-rinse adhesive, restorations were made incrementally using microhybrid composite (Tetric EvoCeram). Each layer was polymerised using a polymerisation device operated either at regular mode (600-650 mW/cm(2) for 20s) (RM) or high-power (1200-1300 mW/cm(2) for 10s) mode (HPM). Two independent calibrated operators evaluated the restorations 1 week after restoration placement (baseline), at 6 months and thereafter annually up to 5 years using modified USPHS and SQUACE criteria. Data were analyzed using Mann-Whitney U-test (α=0.05).
  
  
  RESULTS
  Alfa scores (USPHS) for marginal adaptation (86% and 88% for RM and HPM, respectively) and marginal discoloration (88% and 88%, for RM and HPM, respectively) did not show significant differences between the two-polymerisation protocols (p>0.05). Alfa scores (SQUACE) for marginal adaptation (88% and 88% for RM and HPM, respectively) and marginal discoloration (94% and 94%, for RM and HPM, respectively) were also not significantly different at 5th year (p>0.05).
  
  
  CONCLUSIONS
  Regular and high-power polymerisation protocols had no influence on the marginal quality of the microhybrid composite tested up to 5 years. Both modified USPHS and SQUACE criteria confirmed that regardless of the polymerisation mode, marginal quality of the restorations deteriorated compared to baseline.
authors: Department of Fixed and Removable Prosthodontics, University of Brescia, Brescia, Italy.
authors: Nicola
authors: N
authors: Barabanti
authors: Massimo
authors: M
authors: Gagliani
authors: Jean-François
authors: JF
authors: Roulet
authors: Tiziano
authors: T
authors: Testori
authors: Mutlu
authors: M
authors: Ozcan
authors: Antonio
authors: A
authors: Cerutti
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000328:Adult; D001641:Bicuspid / Q000473:pathology; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D055117:Curing Lights, Dental / Q000145:classification; D001840:Dental Bonding / Q000379:methods; D003731:Dental Caries / Q000628:therapy; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000145:classification*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D055115:Light-Curing of Dental Adhesives / Q000295:instrumentation / Q000379:methods; D008297:Male; D008689:Methacrylates / Q000737:chemistry; D008875:Middle Aged; D008963:Molar / Q000473:pathology; D058105:Polymerization; D055815:Young Adult
chemical_list: D003188:Composite Resins; D003764:Dental Materials; C420130:Excite cement; D008689:Methacrylates; C501891:Tetric EvoCeram