title: Effects of Mechanical and Chemical Pretreatments of Zirconia or Fiber Posts on Resin Cement Bonding.
abstract: The bonding strength between resin cement and posts is important for post and core restorations. An important method of improving the bonding strength is the use of various surface pretreatments of the post. In this study, the surfaces of zirconia (fiber) posts were treated by mechanical and/or chemical methods such as sandblasting and silanization. The bonding strength between the zirconia (fiber) post and the resin cement was measured by a push-out method after thermocycling based on the adhesion to Panavia F 2.0 resin cement. The zirconia and fiber posts exhibited different bonding strengths after sandblasting and/or silanization because of the different strengths and chemical structures. The zirconia post showed a high bonding strength of up to 17.1 MPa after a combined treatment of sandblasting and silanization because of the rough surface and covalent bonds at the interface. This effect was also enhanced by using 1,2-bis(trimethoxysilyl)ethane for the formation of a flexible layer at the interface. In contrast, a high bonding strength of 13.9 MPa was obtained for the fiber post treated by silane agents because the sandblasting treatment resulted in damage to the fiber post, as observed by scanning electron microscopy. The results indicated that the improvement in the bonding strength between the post and the resin cement could be controlled by different chemical and/or mechanical treatments. Enhanced bonding strength depended on covalent bonding and the surface roughness. A zirconia post with high bonding strength could potentially be used for the restoration of teeth in the future.
authors.affiliation: Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Li
authors.affiliation: Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhou
authors.affiliation: Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.affiliation: Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.affiliation: Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China.
authors.forename: Ying Chun
authors.initials: YC
authors.lastname: Sun
authors.affiliation: Department of Prosthodontics, Stomatological Hospital, Tianjin Medical University, Tianjin, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Gao
mesh_terms: D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D004980:Ethane / Q000031:analogs & derivatives / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry*; D013499:Surface Properties; D014297:Trimethylsilyl Compounds / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry*
chemical_list: C438843:Panavia-Fluoro; D019279:Resin Cements; D014297:Trimethylsilyl Compounds; C517344:bis(trimethoxysilyl)ethane; D015040:Zirconium; D004980:Ethane; C028541:zirconium oxide