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首页> 外文期刊>Journal of Applied Oral Science >Shear bond strength of orthodontic brackets to enamel under different surface treatment conditions
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Shear bond strength of orthodontic brackets to enamel under different surface treatment conditions

机译：在不同的表面处理条件下，正畸托槽对牙釉质的剪切粘结强度

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The purpose of the present study was to evaluate the shear bond strength to enamel and the adhesive remnant index (ARI) of both metallic and polycarbonate brackets bonded under different conditions. Ninety bovine permanent mandibular incisors were embedded in acrylic resin using PVC rings as molds and assigned to 6 groups (n=15). In Groups 1 (control) and 3, metallic and polycarbonate orthodontic brackets were, respectively, bonded to the enamel surfaces using Transbond XT composite according to the manufacturer's recommendations. In Groups 2 and 4, both types of brackets were bonded to enamel with Transbond XT composite, but XT primer was replaced by the OrthoPrimer agent. In Groups 5 and 6, the polycarbonate bracket bases were sandblasted with 50-mm aluminum-oxide particle stream and bonded to the enamel surfaces prepared under the same conditions described in Groups 3 and 4, respectively. After bonding, the specimens were stored in distilled water at 37oC for 24 hours and then submitted to shear bond strength test at a crosshead speed of 0.5 mm/min. The results (MPa) showed no statistically significant difference between Groups 4 and 6 (p>0.05). Likewise, no statistically significant differences (p>0.05) were found among Groups 1, 2, and 5, although their results were significantly lower than those of Groups 4 and 6 (p<0.05). Group 3 had statistically significant lower bond strength than Groups 2, 4, and 6, but no statistically significant differences were found on comparison to Groups 1 and 5. A larger number of fractures at the bracket/composite interface were evidenced by the ARI scores. OrthoPrimer bonding agent yielded higher bond strength in the groups using either conventional or sandblasted polycarbonate brackets, which was not observed in the groups using metallic brackets.
机译：本研究的目的是评估在不同条件下粘合的金属支架和聚碳酸酯支架对牙釉质的剪切粘合强度以及粘合残余指数（ARI）。使用PVC环作为模具，将90个牛永久性下颌切牙嵌入丙烯酸树脂中，并分为6组（n = 15）。在第1组（对照组）和第3组中，根据制造商的建议，分别使用Transbond XT复合材料将金属和聚碳酸酯正畸托槽粘结到搪瓷表面。在第2组和第4组中，两种类型的托槽都使用Transbond XT复合材料粘结到搪瓷上，但XT底漆被OrthoPrimer剂代替。在第5组和第6组中，将聚碳酸酯支架底座用50 mm的氧化铝颗粒流喷砂处理，并粘结到分别在第3组和第4组中描述的相同条件下制备的搪瓷表面。粘结后，将样品在37oC的蒸馏水中保存24小时，然后以0.5 mm / min的十字头速度进行剪切粘结强度测试。结果（MPa）显示第4组和第6组之间无统计学差异（p> 0.05）。同样，第1、2和5组之间也没有统计学上的显着差异（p> 0.05），尽管它们的结果明显低于第4和第6组（p <0.05）。第3组比第2、4和6组具有更低的粘结强度，但与第1和5组相比在统计学上没有显着差异。通过ARI评分可以证明支架/复合材料界面处的骨折数量较多。 OrthoPrimer粘合剂在使用常规或喷砂聚碳酸酯支架的组中产生更高的粘合强度，而在使用金属支架的组中未观察到。

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