title: [Bonding interfaces of three kinds of cements and root canal dentin: a scanning electron microscope observation].
abstract: OBJECTIVE
  To compare the bonding properties of three kinds of cements by observing the bonding inteffaces of cements and root canal dentin.
  
  
  METHODS
  15 extracted mandibular premolars were divided into 3 groups, and were cemented by Rely X luting, Panavia F and Paracore 5 mL, respectively. Each tooth was sectioned into two parts and the dentin-cement interfaces at the coronal, middle and apical parts of the fiber post were oberved by scanning electron microscope (SEM). The length of hybrid layer was also recorded.
  
  
  RESULTS
  Hybrid layer was not clearly found in group one, which could be seen on the dentin-cement interfaces of group two and three. Resin tags and lateral adhesives were also observed in group three. From the apical to the coronal part, microgaps seemed gradually smaller in group one, while the hybrid layer became thicker in both group two and three.
  
  
  CONCLUSIONS
  The total-etch resin cement bounds tightly with dentin, and owns a more superior bonding property than self-etch resin cement and resin modified glass ionomer cement.
authors.affiliation: Dept. of Stomatology, Xiangya Hospital, Central South University, Changsha 410008, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.forename: Hui-yun
authors.initials: HY
authors.lastname: Lei
authors.forename: Guo-fu
authors.initials: GF
authors.lastname: Xu
authors.forename: Xiao-peng
authors.initials: XP
authors.lastname: Liang
authors.forename: Ji-jia
authors.initials: JJ
authors.lastname: Li
mesh_terms: D001840:Dental Bonding; D003739:Dental Cementum; D003786:Dental Pulp Cavity; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D008689:Methacrylates; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique; D019279:Resin Cements; D012390:Root Canal Therapy
chemical_list: D017220:Dentin-Bonding Agents; D008689:Methacrylates; C438843:Panavia-Fluoro; C090340:Reliance resin cement; D019279:Resin Cements