不同处理方法对托槽再黏结强度的影响  

Effects of different resin removal methods on shear bond strength of rebonded orthodontic brackets

作　　者：吴海苗 赵丙姣 陈栋 

机构地区：[1]上海市口腔病防治院口腔正畸科 [2]口腔内科,上海200031

出　　处：《上海口腔医学》2015年第3期307-310,共4页Shanghai Journal of Stomatology

摘　　要：目的:比较不同处理方法对金属托槽再黏结强度的影响。方法:选择40颗离体前磨牙为实验对象,随机分为4组。粘结托槽后,选择3组剥离托槽,采用磨除、烧灼、喷砂3种不同托槽底板处理后予以再次黏结,经体外p H循环30 d后,测定托槽的抗剪切强度。采用SPSS 13.0软件包对所得数据进行单因素方差分析。另选取试样通过扫描电镜观察托槽底板的形态及结构。结果:4组间有显著差异,托槽烧灼再黏结组与其他各组间有显著差异,其余各组两两相比,均无显著性差异。结论:托槽底板残留黏结剂经磨除或喷砂处理,可获得与初次黏结相近的黏结强度。PURPOSE： To compare the shear bond strength （SBS） of rebonded orthodontic metal brackets with different resin removal methods. METHODS： Forty extracted premolars were chosen as samples and divided into 4 experimental groups. The teeth were bonded with brackets. The brackets from 3 groups were debonded while adhesive remnants were removed from bracket bases by methods of grinding, sandblasting, and direct flaming, respectively and then rebonded. The SBS values of all rebonded brackets were determined after pH cycling experiment for 30 days. Some rebonded bracket bases were selected and observed under scanning electron microscope （SEM）. The data was analyzed by one-way ANOVA test using SPSS 13.0 software package. RESULTS： Statistical analysis revealed a significant difference of SBS values among the 4 experimental groups （P〈0.05）. The SBS values of the group by direct flaming was significantly lower compared to the other groups （P〈0.05）. There was no significant difference of SBS values among the other groups. CONCLUSIONS： The rebonded brackets after resin removal by grinding and sandblasting have a similar SBS compared to the initial brackets adhesive.

关 键 词：托槽再黏结 抗剪切强度 扫描电镜 

分 类 号：R783.5[医药卫生—口腔医学]