2种脱敏剂对不同水门汀粘接效果的影响

Effect of Two Desensitizers on Bond Strength of Different Cements to Dentine

目的:研究冷热循环后2种脱敏剂对3种水门汀材料粘接剪切强度的影响。方法:将96颗离体牙分成3组:Duraphat、Prime&Bond NT和对照组,每组选取2个试件用扫描电镜(SEM)观察牙本质小管形貌。剩余试件分成3个亚组:RelyX U200、玻璃离子水门汀(GIC)、树脂加强型玻璃离子水门汀(RMGIC),所有试件37℃水浴24h后,每组随机抽取一半试件冷热循环10000次(5℃/55℃),测量剪切强度,统计分析结果。结果:Duraphat、Prime&Bond NT可以不同程度的封闭牙本质小管;Duraphat组剪切强度低于对照组(P<0.05),Prime&Bond NT+RelyX U200组高于对照组(P<0.05),Prime&Bond NT+GIC组低于对照组(P<0.05),Prime&Bond NT+RMGIC组与对照组无差别;冷热循环后所有试件剪切强度均降低(P<0.05),Prime&Bond NT+RelyX U200组剪切强度值最高。结论:两种脱敏剂对3种水门汀粘接强度的影响不同,Prime&Bond NT能提高RelyX U200的粘接强度。

Objective:To evaluate the effect of two desensitizers on shear bond strength(SBS)of dentine to resin composite of three cements after thermal-cycling.Methods:96 premolars were divided into three groups:Duraphat,Prime&Bond NT,and control groups.Two premolars from each group were selected for scanning electron microscopy(SEM),and the remnant were assigned to three subgroups(n=10):RelyX U200,glass ionomer cement(GIC),and resin modified glass ionomer cement(RMGIC/RelyX Luting2 Cement).After 24 h storage in 37℃water bath and thermal-cycling(5℃/55℃),the SBS of all groups was tested by universal testing machine.Results:Two desensitizers occluded the dentine tubules at varying degrees.Duraphat reduced the SBS significantly(P<0.05);the Prime&Bond NT+RelyX U200 improved the retentive strength(P<0.05),however,the Prime&Bond NT+GIC reduced the SBS(P<0.05),and there was no significant difference in the Prime&Bond NT+RMGIC group(P>0.05).After thermal-cycling for 24 h,the SBS values of all groups were reduced(P<0.05),and the maximum value was Prime&Bond NT+RelyX U200 group.Conclusion:Two desensitizers have different effects on three cements,and the Prime&Bond NT can enhance the SBS of RelyX U200.