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目的:评价三种不同的牙釉质处理方法重复粘接托槽时对粘接强度的影响。方法:选择60颗因正畸治疗需要而拔除的前磨牙,均分为三组:37%磷酸处理多次组(组1)、37%磷酸处理一次组(组2)和自酸蚀粘接剂处理组(组3),每组的托槽重复粘接3次,评价每次粘接后的抗剪切粘接强度和牙面剩余粘接树脂面积比,对结果进行统计学分析。结果:各组在第一次和第二次粘接时的抗剪切粘接强度和牙面剩余粘接树脂面积比均相似,但在第三次重复粘接时,组2的抗剪切粘接强度和剩余粘接树脂面积比显著低于组1和组3。同时,组2第三次重复粘接时的粘接强度和剩余粘接树脂面积比明显低于第一次和第二次粘接。结论:自酸蚀粘接系统在重复粘接托槽时的效果与全酸蚀粘接系统相似,但使用全酸蚀粘接系统时可在第二次粘接时不必酸蚀牙面,在第三次及随后的粘接中则需重新酸蚀牙面。
PURPOSE: To evaluate the effect of three different methods of enamel treatment on the bond strength when repeatedly bonding the brackets. Methods: Sixty premolar teeth that were removed due to orthodontic treatment were selected and divided into three groups: 37% phosphoric acid treatment group (group 1), 37% phosphoric acid treatment group (group 2) (Group 3). The brackets of each group were repeatedly glued for 3 times. The shear bond strength after each bonding and the area ratio of residual bonding resin on tooth surface were evaluated, and the results were statistically analyzed. Results: The shear bond strength of the first group and the second group were similar to that of the remaining bonding resin on the tooth surface. However, the shear resistance of group 2 The bonding strength and residual bonding resin area ratio were significantly lower than those of Group 1 and Group 3. At the same time, the bonding strength and the remaining bonding resin area ratio of the second repeated bonding of the group 2 were obviously lower than those of the first and the second bonding. CONCLUSIONS: Self-etching systems are similar to all-etch systems when re-gluing brackets. However, when using a full-etch system, there is no need to etch the surface during the second bond. The third and subsequent bonding requires re-etching of the tooth surface.