不同自酸蚀黏接系统对窝沟封闭剂微渗漏影响的实验研究

目的探讨不同自酸蚀黏接系统对窝沟封闭剂封闭性能和渗透性的影响。方法收集新鲜拔除的离体第三磨牙36颗,随机分成4组,每组9颗,面釉质以杯刷清洁30s;以37%正磷酸酸蚀作为对照组,以ClearFil SE Bond、XenoⅢ以及iBond分别对牙釉质进行黏接作为实验组。涂布可见光固化窝沟封闭剂3MConcise White,光照固化。每组中8颗用1%亚甲基蓝进行染色法检查微渗漏,1颗采用扫描电镜观察封闭剂渗入窝沟的深度以及窝沟封闭剂和牙体组织之间的结合界面的状况。结果Clear FilSE Bond以及XenoⅢ自酸蚀黏接时,对封闭剂微渗漏的影响与对照组相比差异无统计学意义;扫描电镜下,磷酸酸蚀、ClearFil SE Bond以及XenoⅢ组在窝沟封闭中使封闭剂与牙釉质密合性好。结论第五代自酸蚀黏接剂ClearFil SE Bond以及第六代XenoⅢ与牙釉质之间具有良好的封闭能力,可以推荐临床使用。

Microleakage study of fissure sealant using different self-etching bonding agents

Objective To evaluate the microleakage and penetration ability of the light-curing fissure sealant （ 3M Concise White ） using different self-etching bonding agents in vitro. Methods Thirty-six caries-free extracted human third molars were randomly divided into four groups with nine teeth each. Oeclusal surfaces were cleansed by pumice, In the control group, sealants were placed after enamel etching with 37% phosphoric acid. In the remaining three groups, fissures were sealed with the self-etching bonding agents including ClearFil SE bond, Xeno m or iBond. Eight teeth in each group were stained with 1% methylene blue. For the evaluation of penetration of fissure sealants and interface characteristics, one specimen in each group was analyzed by scanning electronic microscopy （SEM）. Results Fissure sealant in the group using iBond showed significantly more microleakage and inferior sealing ability compared with feasure sealants in the other groups. There were no significantly differences concerning the microleakage among groups using phosphoric acid, ClearFil SE bond or Xeno Ⅲ. Conclusion Use of self-etching bonding agents, ClearFil SE bond and Xeno Ⅲ, is recommended for pit and fissure sealing.