title: Microtensile bond strength of silorane-based resin composite and its corresponding adhesive in Class I occlusal restorations.
abstract: OBJECTIVE
  To determine the performance of a silorane-based resin composite, compared to that of a methacrylate-based resin composite, when used with their corresponding adhesive systems, and to determine the effects of c-factor and water storage time in Class I occlusal preparation, by means of microtensile bond strength (microTBS) test.
  
  
  METHODS
  Extracted human third molars were ground flat to expose dentin, and randomly divided into eight groups, according to the type of resin composite, c-factor, and water storage time: (1) Filtek P90/ high c-factor/24 hours, (2) Filtek P90/low c-factor/24 hours, (3) Filtek Z250/high c-factor/24 hours, (4) Filtek Z250/low c-factor/24 hours, (5), Filtek P90/ high c-factor/3 months, (6) Filtek P90/low c-factor/3 months, (7) Filtek Z250/high c-factor/3 months, and (8) Filtek Z250/ low c-factor/3 months. After 24 hours or 3 months of water storage, the bonded hourglass specimens were tested for microTBS, and failure types were also noted. Data were analyzed using three-way ANOVA and Tamhane post-hoc test (alpha = 0.05).
  
  
  RESULTS
  Filtek Z250/low c-factor/24 hours exhibited the highest microTBS (54.19 +/- 9.05 MPa), and Filtek P90/high c-factor/3 months exhibited the lowest (6.94 +/- 2.07 MPa). All groups tested in high c-factor (> 4) preparations and 3-month water storage time showed significant decrease in microTBS, except when comparing between Filtek P90/high c-factor/24 hours and Filtek P90/high c-factor/3 months as there was no statistical difference.
authors.affiliation: Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Henri-Dunant Road, Bangkok 10330, Thailand.
authors.forename: Nantawan
authors.initials: N
authors.lastname: Krajangta
authors.forename: Sirivimol
authors.initials: S
authors.lastname: Srisawasdi
mesh_terms: D003793:Dental Restoration, Permanent; D006801:Humans; D008855:Microscopy, Electron, Scanning; D012117:Resins, Synthetic; D012821:Silanes / Q000737:chemistry*; D013718:Tensile Strength
chemical_list: D012117:Resins, Synthetic; D012821:Silanes