Private dental office, Tehran, Iran.
Metabolic Diseases Research Center, Qazvin University of Medical Sciences, Iran.
Dent Med Probl. 2021 Apr-Jun;58(2):193-200. doi: 10.17219/dmp/131684.
Nowadays, due to the increasing number of adult orthodontic applicants, who also have multiple dental restorations, it is important to have the ability to bond an orthodontic appliance to restoration surfaces.
The aim of this paper was to determine the shear bond strength of ceramic brackets of 3 different base designs bonded to amalgam and composite restorations after using different surface treatment methods in vitro.
In an in vitro study, the surfaces of 180 amalgam and composite specimens were prepared by using sandblasting and the erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er,Cr:YSGG) laser irradiation. Ceramic brackets of 3 base designs, including Star, Cross and Slot, for upper central teeth were bonded to amalgam and composite surfaces by using Transbond™ XT Light Cure Adhesive. All specimens were incubated at a temperature of 37°C for 1 week, and then subjected to shear bond strength tests after 1,000 cycles of thermal cycling. The bond strength of the groups was analyzed by means of the one-way and two-way analysis of variance (ANOVA), and the comparison of the 2 groups was made with Tukey's test. Residual adhesives were also determined by a 4-part criterion (0-3) in different groups and the results were analyzed with the χ2 test.
There was a significant difference in the shear bond strength of brackets of 3 base designs bonded to amalgam and composite surfaces with different surface treatment.
According to the results of this study, all surface treatment methods and different bracket base designs were able to provide sufficient shear bond strength on composite and amalgam surfaces. As far as the bracket base design is concerned, the use of each of the 3 base designs in the amalgam group brought desirable results in terms of the adhesive remnant index (ARI) and shear bond strength values; the use of the Star base design in the composite group proved to be suitable.
如今，由于成年正畸患者数量的增加，他们通常还会有多个牙体修复体，因此能够将正畸矫治器粘结到修复体表面非常重要。
本研究旨在体外评估 3 种不同基底设计的陶瓷托槽经不同表面处理后粘结于银汞合金和复合树脂表面的剪切粘结强度。
在一项体外研究中，通过喷砂和铒铬：掺钇钪镓石榴石（Er,Cr:YSGG）激光照射处理 180 个银汞合金和复合树脂试件的表面。采用 Transbond XT 光固化黏结剂将 3 种基底设计（Star、Cross 和 Slot）的陶瓷托槽粘结于银汞合金和复合树脂表面，用于上颌中切牙。所有试件在 37°C 下孵育 1 周，然后经过 1000 次热循环后进行剪切粘结强度测试。采用单因素和双因素方差分析（ANOVA）分析各组的粘结强度，并采用 Tukey 检验比较两组之间的差异。不同组别的残余粘结剂按 4 分制（0-3）进行评估，并采用 χ2 检验进行分析。
3 种基底设计的托槽粘结于经不同表面处理的银汞合金和复合树脂表面的剪切粘结强度有显著差异。
根据本研究结果，所有表面处理方法和不同托槽基底设计均能在复合树脂和银汞合金表面提供足够的剪切粘结强度。就托槽基底设计而言，3 种基底设计在银汞合金组中的应用均获得了理想的黏附残留指数（ARI）和剪切粘结强度值；在复合树脂组中使用 Star 基底设计较为适宜。
