title: Five-year clinical performance of a silorane- vs a methacrylate-based composite combined with two different adhesive approaches.
abstract: OBJECTIVE
  The objective of this study was to compare the 5-year clinical performance in posterior restorations of three restorative systems including a low-shrinkage system and a methacrylate-based composite combined either with an etch-and-rinse or a self-etch adhesive.
  
  
  METHODS
  Each of 25 patients received three class I (occlusal) or class II restorations performed with each one of the three restorative systems: Filtek Silorane Restorative System including a two-step self-etch adhesive, Adper Scotchbond 1 XT (two-step etch-and-rinse adhesive) + Filtek Z250, and Adper Scotchbond SE (two-step self-etch adhesive) + Filtek Z250. All materials were applied as per manufacturer's instructions. Two blind observers evaluated the restorations at four different moments (baseline, after 1, 2, and 5 years) according to the USPHS-modified criteria. Kruskal-Wallis and Mann-Whitney U tests were conducted to compare the behavior of the restorative systems, while Friedman and Wilcoxon tests were applied to analyze the intrasystem data (p < 0.05).
  
  
  RESULTS
  After 5 years, marginal staining around the restorations with Adper Scotchbond SE + Filtek Z250 was statistically more frequent and severe than that of the restorations performed with the other two systems. Intrasystem comparisons revealed a deterioration of the marginal adaptation after 5 years for all systems. A significant number of restorations bonded with self-etch adhesives showed marginal staining after 5 years of clinical service. A deterioration of the color appearance and an increase of the surface roughness were also detected in the restorations performed with Adper Scotchbond SE + Filtek Z250.
  
  
  CONCLUSIONS
  A deterioration of the marginal adaptation was evidenced for all restorative systems, while marginal staining was more frequently seen only around the restorations performed with self-etch adhesives.
  
  
  CONCLUSIONS
  No advantage was found of the silorane- over the methacrylate-based composite when combined with an etch-and-rinse adhesive.
authors.affiliation: Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Av. Atenas s/n, 28922, Alcorcón, Madrid, Spain. bbaracco@hotmail.com.
authors.forename: Bruno
authors.initials: B
authors.lastname: Baracco
authors.affiliation: Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Av. Atenas s/n, 28922, Alcorcón, Madrid, Spain.
authors.forename: M Victoria
authors.initials: MV
authors.lastname: Fuentes
authors.affiliation: Department of Stomatology and Nursing, Health Sciences Faculty, Rey Juan Carlos University, Av. Atenas s/n, 28922, Alcorcón, Madrid, Spain.
authors.forename: Laura
authors.initials: L
authors.lastname: Ceballos
mesh_terms: D000134:Acid Etching, Dental; D000293:Adolescent; D000328:Adult; D003188:Composite Resins / Q000737:chemistry*; D003738:Dental Cements / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005260:Female; D006801:Humans; D008297:Male; D008689:Methacrylates / Q000737:chemistry*; D008875:Middle Aged; D019279:Resin Cements; D062047:Silorane Resins / Q000737:chemistry*; D016896:Treatment Outcome
chemical_list: C000623315:Adper Scotchbond SE; D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; D008689:Methacrylates; D019279:Resin Cements; D062047:Silorane Resins; C555513:silorane composite resin; C041330:Scotchbond
keywords: Clinical evaluation; Etch-and-rinse adhesive; Low-shrinkage; Posterior restorations; Self-etch adhesive; Silorane