title: Bond strengths of silorane- and methacrylate-based composites to various underlying materials.
abstract: OBJECTIVE
  To evaluate shear bond strength (SBS) values of a methacrylate (FZ 250) and a silorane-based (FS) resin composite to various underlying materials.
  
  
  METHODS
  A total of 80 samples were prepared with four different underlying materials; a flowable (FLC) and a bulk-fill flowable composite (BFC), and a conventional (CGIC) and resin modified glass-ionomer cement (RMGIC). These underlying materials were laminated plus to methacrylate or silorane-based resin composites (n = 10). To evaluate the specimens SBS values were evaluated with a universal testing machine (cross-head speed; 1.0 mm/min). Statistical comparisons were carried out using two-way ANOVA and Tukey's post hoc test with a significance level of P < 0.05.
  
  
  RESULTS
  SBS values for FZ250 were significantly higher than for FS for all of the underlying materials tested (P < 0.05). SBS values of FZ250 to BFC were significantly higher than to all other materials (P < 0.05), whereas SBS values of FS did not vary significantly according to underlying material (P > 0.05).
  
  
  CONCLUSIONS
  The use of FS in conjunction with any of the tested materials showed lower SBS than the FZ 250. Also, new low elastic modulus liner BFC presented slightly good interfacial adhesion so, the usage of BFC as an underlying material may be preferable for FZ 250.
authors.affiliation: Departments of Pediatric Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Atakum, 55139 Samsun, Turkey.
authors.forename: Sezin
authors.initials: S
authors.lastname: Ozer
authors.affiliation: Departments of Pediatric Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Atakum, 55139 Samsun, Turkey.
authors.forename: Emine
authors.initials: E
authors.lastname: Sen Tunc
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, Ondokuz Mayıs University, Atakum, 55139 Samsun, Turkey.
authors.forename: Nihan
authors.initials: N
authors.lastname: Gonulol
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D062047:Silorane Resins / Q000737:chemistry*
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; D008689:Methacrylates; D062047:Silorane Resins; C111840:flowable hybrid composite; C555513:silorane composite resin