摘要
目的:观察不同方法处理脱落托槽底板后再粘接的粘接强度。方法:选择因正畸需要而拔除的健康前磨牙50颗,随机平均分为A、B、C、D、E组,B、C、D、E组粘接新托槽并于1h后去除,并从脱落托槽中选择30枚,随机分成3组,每组10枚,分别采取喷砂、打磨、热处理3种方法处理后,再分别与B、C、D组前磨牙粘接;A、E组前磨牙粘接新托槽。分别测量其抗剪强度并记录粘接剂残留指数(ARI)。结果:5组的抗剪强度依次是(18.42±2.85)MPa,(15.91±6.69)MPa,(15.59±7.43)MPa,(17.22±3.65)MPa,(19.32±4.31)MPa,5组间抗剪强度差异无统计学意义(P>0.05)。5组的ARI总计分依次是6、12、17、8、6分,其中D组低于C组(P<0.05);A组和E组均显著低于C组(P<0.01);其它组间差异无统计学意义(P>0.05)。结论:体外研究中,对脱落托槽底板残留粘接剂分别采取喷砂、热处理、打磨3种不同方法处理后再次粘接,均可获得和新托槽相近的抗剪强度,3种处理方法间无明显差别。
Objective：To compare shear bond strength （SBS） of rebonded metal brackets between three kinds of treatment methods. Methods ： 50 extracted human premolars were selected and divided as Group A, B, C, D, E. Group B,C,D and E were bonded with new brackets, and 1 hour later,the brackets were debonded. Thirty of the debonded brackets were rebonded to Group B, C, D after recycling by sand blasting,carbide bur grinding or burning,respectively. In Group A and E,new brackets were bonded to buccal enamel surfaces. The SBS were tested and adhesive remnant index （ARI） scores were recorded. Results ： The SBS of 5 groups were （ 18.42 ± 2.85 ） MPa, （ 15.91 ± 6.69 ） MPa, （ 15.59 ± 7.43） MPa, （ 17.22 ± 3.65 ） MPa, （ 19.32 ± 4.31 ） MPa, respectively. There was no statistically significant difference between them in the SBS （P 〉 0.05）. The ARI scores of 5 groups were 6,12,17,8,6, respectively. Compared with Group C on the ARI, Group D （ P 〈 0.05 ）, Group A （ P 〈 0. 01 ） and Group E （ P 〈 0.01 ） were all significantly lower. Conclusion：In vitro, there is no evident difference in the SBS among sand blasting, grinding and burning treatment methods on the remnant adhesives of rebonded brackets, which all can make the rebonded brackets get SBS approximate to that of new brackets.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2009年第2期170-173,共4页
Journal of Practical Stomatology
关键词
脱落托槽
抗剪强度
粘接剂残留指数
Bonded bracket
Shear bond strength （SBS）
Adhesive remnant index （ARI）
