酸蚀对乳牙玻璃离子窝沟封闭微渗漏和微拉伸强度的比较研究  

A comparative study of microleakage and microtensile bond strengths of ART glass ionomer cement sealant with or without acid etching in primary molars

作　　者：武洁[1,2,3] 刘茜 陈央兰[1,2] 周红艳 梅予锋[1,2] WU Jie;LIU Qian;CHEN Yanglan;ZHOU Hongyan;MEI Yufeng(Jiangsu Key Laboratory of Oral Diseases,Nanjing Medical University,Nanjing 210029,China)

机构地区：[1]南京医科大学口腔疾病研究江苏省重点实验室,江苏南京210029 [2]南京医科大学口腔医学院附属口腔医院儿童口腔预防口腔科,江苏南京210029 [3]南京医科大学附属妇产医院,南京市妇幼保健院口腔科,江苏南京210004

出　　处：《口腔医学》2020年第11期1021-1025,共5页Stomatology

基　　金：江苏高校优势学科建设工程资助项目(2018⁃87)。

摘　　要：目的比较分析酸蚀处理乳牙釉质表面对玻璃离子窝沟封闭材料微渗漏和微拉伸强度的影响。方法离体第二乳磨牙24颗,随机分为酸蚀和配套液体为处理剂两组,两组均采用Ketac®Molar Easymix玻璃离子和非创伤性充填指压技术进行窝沟封闭。分别进行微渗漏和微拉伸强度实验,并用扫描电镜观察两组窝沟釉质表面微结构变化,剖面封闭剂与窝沟结合界面的状况。结果酸蚀组微渗漏评分低于处理剂组,有显著性差异(P<0.05)。酸蚀组微拉伸结合强度(0.93±0.40)MPa,高于处理液组((0.56±0.22)MPa),有显著性差异(P<0.05)。扫描电镜图像显示酸蚀后釉质表面呈典型蚀刻模式,剖面封闭材料与釉质表面有嵌合样结合层,处理液处理后釉质与封闭材料界面出现连续微间隙。结论酸蚀在釉质表面形成微孔结构,有利于玻璃离子封闭剂进入,增加与釉质结构的嵌合,并减少微渗漏,增强粘结强度。Objective To compare the micro⁃leakage and micro⁃tensile bond strengths of glass ionomer cement sealant with or without acid etching in primary molars.Methods A total 24 second primary molars in vitro were randomly divided into two groups:the acid etching and the liquid conditioned groups.Both groups were placed in pit and fissure sealant with Ketac®Molar Easymix glass ion⁃omer by ART filling finger pressing technique.Then the microleakage and the microtensile strength tests were performed,the micro⁃sur⁃face changes of enamel of the samples and the conditions of the section combination and interface of pits and fissures with sealant were observed by scanning electron microscope(SEM).Results The microleakage score in the acid etching group was lower than the liquid conditioned group with significant difference(P<0.05).The microtensile bond strengths of the acid etching and the liquid group were(0.93±0.40)MPa and(0.56±0.22)MPa,respectively,indicating significant difference between the two groups(P<0.05).SEM ima⁃ges showed that enamel surfaces presented topical etching pattern and the enamel and GIC interface revealed the hybrid⁃likely layer in the acid etching sample.The continuous micro⁃gap was found between the enamel and GIC interface in the conditioner sample.Conclusion Acid etching produces micro⁃porous structure on the surface of enamel,which is conducive to improve GIC sealant penetration and the bonding with enamel structure and reduce microleakage.

关 键 词：乳牙 玻璃离子 窝沟封闭 酸蚀 微渗漏 微拉伸 

分 类 号：R780.1[医药卫生—口腔医学]