Purpose

The adhesion strength of orthodontic brackets bonded to dental glass ceramics was evaluated after ceramic surface was treated with two-step and one-step surface conditioning systems, and subjecting to thermo-cycling.

Materials and Method

A total of forty specimens were fabricated from silica based glass ceramic (lithium disilicate) by duplicating the buccal surface of maxillary first premolar. The specimens were randomly assigned to two experimental groups (n=20), group one specimens were treated with two-step surface conditioning system (IPS ceramic etching gel^TM and Monobond plus^TM) and group two specimens were treated with one-step surface conditioning system (Monobond etch and prime^TM). The surface roughness of the specimens after treatment with two-step and one-step surface conditioning system was measured using non-contact surface profilometer. Ten randomly selected specimens from each group were subjected to thermo-cycling and the remaining ten served as baseline. The shear bond strength of the specimens was measured using universal material testing machine. The adhesive remnant index score was calculated, and the results of surface roughness and bond strength were tabulated and subjected to analysis of variance and post hoc tukey's test at a significance level of p<0.05.

Results

The results of the study showed that the specimens treated with two-step conditioning system had higher surface roughness and bond strength than one-step conditioning system. The maximum specimens treated with both two-step and one-step conditioned specimens showed adhesive failure after subjecting thermo-cycling.

Conclusions

Traditional two-step conditioning provides better bond strength and the clinical importance of the study is that, the silane promoted adhesion significantly reduces on exposure to water over a period of time.

中文翻译：

---

玻璃陶瓷的两步和一步表面处理对正畸支架附着强度的影响以及水分对附着强度的影响

目的

在用两步和一步表面调节系统处理陶瓷表面并进行热循环之后，评估与牙齿玻璃陶瓷结合的正畸托槽的粘附强度。

材料与方法

通过复制上颌第一前磨牙的颊面，由二氧化硅基玻璃陶瓷（二硅酸锂）制成总共40个样品。将标本随机分为两个实验组（n = 20），第一组标本采用两步表面处理系统（IPS陶瓷蚀刻凝胶^TM和Monobond plus ^TM）进行处理，第二组标本采用单步表面处理进行处理。系统（Monobond etch and prime ^TM）。使用非接触式表面轮廓仪测量经过两步和一步表面调节系统处理后的样品的表面粗糙度。从每组中随机抽取十个样本进行热循环，其余十个作为基准。使用通用材料测试机测量样品的剪切粘结强度。计算粘合剂残余指数得分，并将表面粗糙度和粘结强度的结果制成表格，并进行差异分析和事后图基检验，显着性水平为p <0.05。

结果

研究结果表明，采用两步调理系统处理的样品具有比一步调理系统更高的表面粗糙度和粘结强度。经过两步和一步条件试样处理的最大试样在经历热循环后显示出粘合失败。

结论

传统的两步调理可提供更好的粘合强度，并且该研究的临床重要性在于，硅烷促进的粘合性在一段时间内暴露于水后会显着降低。