title: Effects of silane application on luting fiber posts using self-adhesive resin cement.
abstract: OBJECTIVE
  To evaluate the effects of different glass-fiber post surface treatments on the bond strength to root dentin.
  
  
  METHODS
  Fifty bovine incisors were used in this study. After removing the crowns, the teeth were endodontically treated. The roots were randomly divided into five groups according to post surface treatment. The groups were as follows: CO (Control) - no treatment; G1 - RelyX Ceramic Primer (silane) only; G2 - silane and Solobond M; G3 - silane and Scotchbond Adhesive; G4 - silane and Excite. For post cementation, RelyX Unicem was used according to the manufacturer's recommendation and the roots were stored in a light-proof container with 100% relative humidity for 24 h. The specimens were transversally sectioned. Subsequently, the cervical, middle, and apical regions of the root were positioned in a push-out device and tested at 0.5 mm/min using a universal testing machine (Instron). The data were statistically analyzed with two-way ANOVA and Tukey's post-hoc test. The fractured specimens were then observed under a stereoscopic loupe at 60X magnification.
  
  
  RESULTS
  No significant difference in bond strength was found among the groups that received a silane or silane plus an adhesive system (p > 0.05). However, the CO (no silane) showed the lowest bond strength. Regarding G1, G2, G3, and G4, the cervical region of the root canal attained better bond strengths than did the middle or apical regions. The most frequent failure mode occurred at the cement/dentin interface.
  
  
  CONCLUSIONS
  Silane application may be necessary to improve the adhesion of fiber posts luted with the self-adhesive resin cement evaluated here. The application of an adhesive layer between the fiber post and resin cement did not have any influence on the bond strength when the silane coupling was previously used.
authors.affiliation: Department of Restorative Dentistry, University of Campinas, Piracicaba, Brazil. arienearcasleme@gmail.com
authors.forename: Ariene Arcas
authors.initials: AA
authors.lastname: Leme
authors.forename: André Luis
authors.initials: AL
authors.lastname: Pinho
authors.forename: Luciano
authors.initials: L
authors.lastname: de Gonçalves
authors.forename: Lorenço
authors.initials: L
authors.lastname: Correr-Sobrinho
authors.forename: Mario Alexandre
authors.initials: MA
authors.lastname: Sinhoreti
mesh_terms: D000818:Animals; D002417:Cattle; D002484:Cementation / Q000379:methods; D001840:Dental Bonding; D003786:Dental Pulp Cavity / Q000648:ultrastructure; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D006813:Humidity; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D019227:Tooth Apex / Q000648:ultrastructure; D019237:Tooth Cervix / Q000648:ultrastructure; D019553:Tooth, Nonvital / Q000473:pathology
chemical_list: D017220:Dentin-Bonding Agents; C420130:Excite cement; D008689:Methacrylates; C483701:Rely X Unicem; D019279:Resin Cements; D012821:Silanes; C425825:Solobond M; C009753:fiberglass; C041330:Scotchbond