title: [Experimental study on bond strength of machinable composite resin and dentin with three kinds of resin cements].
abstract: OBJECTIVE
  To examine the shear and microtensile bond strength between a newly developed dental machinable composite resin (polymethylmetacrylate/nano SiO2-ZrO2, PNSZ) and dentin cemented using three resin luting systems and to select the most suitable one.
  
  
  METHODS
  The shear and microtensile bond strength between the machinable composite resin and dentin cemented using three resin luting systems (Group A:RelyX ARC, Group B:Panavia-F,Group C:Variolink II) were tested. The broken specimens were observed with a stereomicroscope (x 50) to compare their failure modes. RESULTS; In the shear tests, no significant difference was found in bond strength among Group A [ (14. 07 +/- 4. 67) MPa] ,Group B[ (13.17 +/- 4. 63) MPa] and Group C [ ( 12. 10 +/- 2.18) MPa] (P > 0.05) . In the microtensile tests, no significant difference was found in bond strength among Group A [(11.49 +/- 4.90) MPa],Group B[(9.66 +/- 4.15) MPa].and Group C[(10.11 +/- 4.20) MPa](P > 0. 05).The failure modes of all the three resin cements were predominantly adhesive failures at the dentin/cement interface.
  
  
  CONCLUSIONS
  The three types of resin cements showed similar results in bond strength between the dental machinable composite resin and dentin. Bonding at the resin/cement interface was stronger than that at the dentin/cement interface.
authors.affiliation: Research Center of Engineering and Technology for Dental Computing, Ministry of Health, Peking University School and Hospital of Stomatology, Beijing, 100081, China.
authors.forename: Xue-Bing
authors.initials: XB
authors.lastname: Yan
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.forename: Gang
authors.initials: G
authors.lastname: Zheng
authors.forename: Pei-Jun
authors.initials: PJ
authors.lastname: Lü
mesh_terms: D000180:Acrylic Resins; D003188:Composite Resins; D001840:Dental Bonding; D003776:Dental Porcelain; D003799:Dental Stress Analysis; D003804:Dentin; D006801:Humans; D011140:Polyurethanes; D019279:Resin Cements; D033081:Shear Strength
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; D019279:Resin Cements; D003776:Dental Porcelain