title: Influence of chemical surface treatments on adhesion of fiber posts to composite resin core materials.
abstract: OBJECTIVE
  This study evaluated the effect of different chemical surface treatments on the adhesion of resin-core materials to methacrylate resin-based glass fiber posts.
  
  
  METHODS
  Two types of glass fiber posts (Reblida post; VOCO and RelyX post; 3M ESPE) were divided into eight groups according to the surface treatment used; Gr 1 (control; no surface treatment), Gr 2 (silanization for 60s), Gr 3 (10% H₂O₂ for 5 min), Gr 4 (10% H₂O₂ for 10 min), Gr 5 (30% H₂O₂ for 5 min), Gr 6 (30% H₂O₂ for 10 min), Gr 7 (CH₂Cl₂ for 5 min) and Gr 8 (CH₂Cl₂ for 10 min). Two resin core materials (Grandio DC; VOCO and Filtek P60; 3M ESPE) were applied to each group for testing the adhesion using micropush-out test. Failure types were examined with stereomicroscope and surface morphology of the posts was characterized after treatment using a scanning electron microscope (SEM). Data were analyzed using ANOVA and Tukey's test.
  
  
  RESULTS
  The type of post, surface treatment, and core material showed a significant effect on the micropush-out bond strength (P<0.001). Groups treated with CH₂Cl₂ or 30% H₂O₂ solutions for 5 or 10 min showed the highest adhesion values for both types of posts with the core materials tested. Stereomicroscope showed that most failure modes were adhesive type of failures between post and core material. SEM analysis revealed that the fiber post surfaces were modified after chemical surface treatments.
  
  
  CONCLUSIONS
  Application of CH₂Cl₂ or 30% H₂O₂ to the fiber post surfaces enhanced the adhesion to resin cores.
authors.affiliation: Department of Dental Biomaterials, Faculty of Dentistry, Mansoura University, Mansoura PC 35516, Egypt. shaymanaghy@mans.edu.eg
authors.forename: Shaymaa E
authors.initials: SE
authors.lastname: Elsaka
mesh_terms: D000268:Adhesiveness; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003799:Dental Stress Analysis; D019544:Equipment Failure Analysis; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D008689:Methacrylates / Q000737:chemistry; D008752:Methylene Chloride / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry
chemical_list: D003188:Composite Resins; D008689:Methacrylates; D019279:Resin Cements; D012821:Silanes; D008752:Methylene Chloride; D006861:Hydrogen Peroxide