The effect of different cement on the microleakage and bonding efficiency of chair-side CAD/CAM

LI Qiu-tong

doi:10.3969/j.issn.1672-2973.2017.06.009

Abstract：Objective:To compare the microleakage and bonding efficiency of chair-side CAD/CAM with three resin cement.Methods:Molar teeth with no caries or defect extracted for periodontal disease were chosed.According to different resin cement,teeth were randomly divided into 3 groups:Group S(Superbond C&B group),Group R(Rely X Unicem group),Group K(Kerr Maxcem Elite group).The ceramic-dentin test specimens were fabricated,and after thermocycling experiment,the lenth of micro seepage and bonding efficiency were tested.Bond failure mode was observed by stereomicroscope.Result:There was no significant difference on lenth of microleakage in three groups(F=2.808,P=0.076).There was significant difference on bonding efficiency in three groups(F=24.768,P=0.000).The bonding efficiency of Group M and Group S were higher than that of Group R(P＜ 0.05),and there was no significant difference on bonding efficiency between Group S and Group K(P＞0.05).There was significant difference on bond failure mode in three groups.The bond failure mode of Group S and Group K were distinguished from Group R(P＜ 0.0167),and there was no significant difference on bond failure mode between Group S and Group K(P＞0.0167).Conclusion:The three groups of adhesives showed good resistance to microleakage,and there was no obvious difference.But Superbond C&B and Kerr Maxcem Elite are better than Rely X Unicem on bonding efficiency.So,the first two resin cement have better bonding efficiency for pulpless teeth,but still need more samples and clinical observation to confirm.