Purpose

The study evaluated and compared the effect of pre-etching heat treatment and post-etching surface neutralization on the surface texture parameters and initial adhesion strength of orthodontic brackets bonded to lithium disilicate glass-ceramic using water-based and resin-based cement.

Materials and methods

A total of 120 samples were fabricated by duplicating the buccal surface of the maxillary premolar. The samples were randomly assigned to two groups: the cementing surface of group 1 samples was heat-treated, and that of group 2 samples was left untreated. The samples of each group were further divided into 4 subgroups (n = 15) according to the use of neutralization and the type of cement used for bonding. The surface texture parameters after etching were determined using a non-contact surface profilometer, and the bond strength was determined by a universal material tester. The results were analyzed by analysis of variance and the Scheffe post hoc test.

Results

The samples that were heat-treated showed statistically significant higher bond strength in all the subgroups, and the acid-neutralized samples showed higher bond strength using both types of cement; however, the increase was statistically significant only in resin-based cement-bonded samples. Resin-based cement-bonded samples showed higher bond strength than water-based cement-bonded samples.

Conclusion

Pre-etching heat treatment and post-etching acid neutralization of the cementing surface of lithium disilicate glass-ceramic significantly improve the surface texture and initial bond strength to orthodontic brackets.

中文翻译：

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热处理和表面中和对正畸托槽与二硅酸锂玻璃陶瓷结合强度的影响。

目的

该研究评估并比较了蚀刻前热处理和蚀刻后表面中和对使用水基和树脂基水泥粘结到二硅酸锂玻璃-陶瓷的正畸托槽表面纹理参数和初始粘合强度的影响。

材料和方法

通过复制上颌前磨牙的颊面共制作了120个样品。将样品随机分为两组：对第1组样品的胶合表面进行热处理，对第2组样品的胶合表面进行不处理。 根据中和的用途和用于粘结的水泥的类型，将每组样品进一步分为4个亚组（n = 15）。使用非接触表面轮廓仪确定蚀刻后的表面纹理参数，并通过通用材料测试仪确定粘合强度。通过方差分析和Scheffe post hoc检验来分析结果。

结果

经热处理的样品在所有亚组中均具有统计学上显着的较高粘结强度，而经酸中和的样品在两种水泥中均具有较高的粘结强度。但是，这种增加仅在树脂基水泥粘结样品中具有统计学意义。树脂基水泥粘结样品显示出比水基水泥粘结样品更高的粘结强度。

结论

二硅酸锂玻璃陶瓷的胶合表面的蚀刻前热处理和蚀刻后酸中和作用显着改善了表面纹理和与正畸托槽的初始粘结强度。