Department of Dentistry, School of Dentistry, Potiguar University (Laureate International Universities), Natal, Brazil.
Acta Odontol Scand. 2013 May-Jul;71(3-4):632-7. doi: 10.3109/00016357.2012.700067. Epub 2012 Jul 12.
This study aimed to evaluate the effect of pre-heated composite restoratives on the shear bond strength (SBS) of orthodontic brackets.
The following materials were tested: a microhybrid composite restorative (Filtek Z250), two nanofilled composite restoratives (Filtek Z350 and NT Premium), a nanohybrid composite restorative (Brilliant) and a conventional orthodontic adhesive (Transbond XT). All materials were stored for 1 h in the incubator either at 25°C (room temperature simulation) or 60°C before bonding 100 orthodontic brackets on bovine lower incisors (n = 10). One Coat Bond SL and Transbond XT were used to bond the composite restoratives and the Transbond XT adhesive paste, respectively. After storage in distilled water for 24 h, the brackets were subjected to SBS test at a speed of 0.5 mm/min until bracket debonding. The Adhesive Remnant Index (ARI) was assigned to the fractured specimens. Data were analyzed using the one-way ANOVA and the Tukey post-hoc test (p < 0.05). The Kruskal-Wallis test was used to compare ARI scores between the groups (p < 0.05).
There was no statistically significant difference between the materials at room temperature. Samples bonded with pre-heated materials showed a statistically higher SBS than those bonded with room temperature materials. Samples bonded with the pre-heated orthodontic adhesive showed the highest SBS among all the pre-heated materials. All preheated composite restoratives produced an SBS mean higher than that of Transbond XT stored at room temperature.
The use of pre-heated composite restoratives and orthodontic adhesives might be an alternative approach to bond orthodontic brackets.
本研究旨在评估预热复合修复材料对正畸托槽剪切粘结强度（SBS）的影响。
测试了以下材料：一种微混合复合修复材料（Filtek Z250）、两种纳米填充复合修复材料（Filtek Z350 和 NT Premium）、一种纳米混合复合修复材料（Brilliant）和一种传统正畸粘合剂（Transbond XT）。所有材料在孵育箱中储存 1 小时，温度分别为 25°C（室温模拟）或 60°C，然后在牛下切牙上粘结 100 个正畸托槽（n = 10）。One Coat Bond SL 和 Transbond XT 分别用于粘结复合修复材料和 Transbond XT 粘合剂糊剂。在蒸馏水中储存 24 小时后，以 0.5mm/min 的速度对托槽进行 SBS 测试，直到托槽脱粘。对断裂标本进行粘结剂残留指数（ARI）评定。使用单向方差分析和 Tukey 事后检验（p < 0.05）对数据进行分析。Kruskal-Wallis 检验用于比较各组之间的 ARI 评分（p < 0.05）。
在室温下，各材料之间没有统计学差异。与室温材料粘结的样品显示出统计学上更高的 SBS，而与预热材料粘结的样品则显示出统计学上更高的 SBS。与所有预热材料相比，用预热正畸粘合剂粘结的样品显示出最高的 SBS。所有预热复合修复材料的 SBS 均值均高于室温下储存的 Transbond XT。
使用预热复合修复材料和正畸粘合剂可能是粘结正畸托槽的一种替代方法。
