title: A simple 2-step silane treatment for improved bonding durability of resin cement to quartz fiber post.
abstract: BACKGROUND
  This study examined a clinically feasible protocol for improving hydrolytic stability using a 2-step silanization including a nonorganofunctional silane.
  
  
  METHODS
  The surfaces of 24 D.T. Light-Posts (Bisco Inc, Schaumburg, IL) were polished and assigned to the following 4 groups: M: 1-step silanization with Monobond-S (MS) (Ivoclar Vivadent, Schaan, Liechtenstein); BM: 2-step silanization with 5% 1,2-bis(triethoxysilyl)ethane and then MS; and HM and HBM: 1-step and 2-step silanization, respectively, after 24% H2O2 etching. Four resin composite cylinders (RelyX Unicem; 3M ESPE, St Paul, MN) were bonded on each surface according to a microshear testing protocol. All bonded samples were stored in water at 37°C for 24 hours, and half of them were then thermocycled 5000 times before microshear testing (n = 12). The failure modes were evaluated under an optical and scanning electron microscope. Water contact angles were measured on the post surfaces before and after silanization to estimate surface hydrophobicity. The results were statistically analyzed using 2-way analysis of variance and the Tukey test.
  
  
  RESULTS
  The bond strengths for the BM and HBM groups were significantly higher than the M and HM groups at 5000 thermocycles (P < .05), whereas no significant differences were found between the 4 groups before thermocycling (P > .05). All debonded samples showed some fractured fibers. No significant difference in the hydrophobicity was found between the 1-step and 2-step silanized post surfaces (P > .05).
  
  
  CONCLUSIONS
  The 2-step 1,2-bis(triethoxysilyl)ethane/MS treatment has potential as a silanization procedure for enhancing the hydrolytic stability of the fiber post/resin composite interface.
authors.affiliation: Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
authors.forename: Young Kyung
authors.initials: YK
authors.lastname: Kim
authors.forename: Jun Sik
authors.initials: JS
authors.lastname: Son
authors.forename: Kyo-Han
authors.initials: KH
authors.lastname: Kim
authors.forename: Tae-Yub
authors.initials: TY
authors.lastname: Kwon
mesh_terms: D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D005240:Feasibility Studies; D006801:Humans; D006861:Hydrogen Peroxide / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry*; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry*; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D017155:Wettability
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D008689:Methacrylates; C076808:Monobond S; C483701:Rely X Unicem; D019279:Resin Cements; D012821:Silanes; D014867:Water; D011791:Quartz; C017492:methacryloxypropyltrimethoxysilane; D006861:Hydrogen Peroxide; C515211:1,2-bis(triethoxysilyl)ethane
keywords: Bond strength; fiber post; silane; wettability