摘要
目的:比较磨除和喷砂去除托槽底板残余树脂后在不同釉质酸蚀时间下托槽的再粘接强度(RBS)。方法:54颗离体牙釉质表面去除残留粘接材料,随机分成3组采取不同时长的酸蚀处理,分别为30、60 s和不酸蚀,每组随机选取一半粘接喷砂处理的托槽,分别记为SD3组、SD6组和SD组,另一半粘接磨除处理的托槽,分别记为DD3组、DD6组和DD组(n=9)。测得RBS和粘接剂残余指数(ARI)。电镜扫描托槽脱位后的釉质表面。结果:(1)SD6组RBS值高于DD组及SD组,ARI有统计学差异(P<0.05);(2)SD3组RBS值高于其他组,SD3组与SD6组,DD3组与DD6组均无统计学差异(P>0.05)。结论:托槽底板使用50μm氧化铝喷砂处理,釉质去除粘接材料后用35%磷酸酸蚀30 s,再粘接效果较好。
Objective: To compare rebonding strength(RBS) of bracket bases after treatment of sandblasting or green stone drilling and enamel etching for different time. Methods: 54 collected teeth randomly divided into 3 groups(n=18), to recycle the brackets, residual resin was first removed by tungsten carbide bur and enamel surface was respectively etched for varying periods of time: 30, 60 and 0 s. Debonded brackets were divided randomly into 2 groups for sandblasting(group SD3, group SD6 and group SD) or green stone drilling(group DD3, group DD6 and group DD)(n=9). The recycled brackets were rebonded to the enamel surfaces. The RBS range and adhesive remaining index(ARI) were examined. SEM was used to observe the enamel surfaces after debonding. Results:(1) The RBS values of group SD6 were higher than that of group DD and group SD, and ARI scores of SD and DD group were lower than that of other groups(P<0.05).(2)The RBS value of group SD3 was higher than that of other groups and there was no statistical significance(P>0.05) among group SD3 and group SD6, group DD3 and group DD6. Conclusion: When brackets are to be recycled, the bracket bases treated with 50 μm aluminum oxide sandblasting and enamel-etching for 30 seconds may have better rebonding strength when compared to bracket bases treated with green stone drilling.
作者
张泽宇
奥玛里
肖立伟
ZHANG Zeyu;Ahmad Omari;XIAO Liwei(Medical Center of Stomatology,The Second Xiangya Hospital,Central South University,410011 Changsha,China)
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2019年第3期416-419,共4页
Journal of Practical Stomatology
