[Experimental study on bond strength of machinable composite resin and dentin with three kinds of resin cements].
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.
Yan
Xue-Bing
XB
Research Center of Engineering and Technology for Dental Computing, Ministry of Health, Peking University School and Hospital of Stomatology, Beijing, 100081, China.
Wang
Yong
Y
Zheng
Gang
G
Lü
Pei-Jun
PJ
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
D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; D019279:Resin Cements; D003776:Dental Porcelain