Arcas Luciana P B, Baroudi Kusai, de Matos Caroline A B, Ribeiro Fabiana C, Silva-Concílio Laís R, Amaral Marina
Department of Dentistry, Faculty of Dentistry University of Taubaté, Taubaté, Brazil.
RAK College of Dental Sciences, RAK Medical & Health Sciences University, Ras al Khaimah, United Arab Emirates.
Turk J Orthod. 2023 Sep 29;36(3):194-198. doi: 10.4274/TurkJOrthod.2022.2022.23.
The aims of this study were to compare the bond strength between metallic brackets and two different glass ceramics and to evaluate the ceramic surface roughness after different finishing protocols.
The surface roughness of lithium disilicate and resin matrix ceramic samples was measured (initial). All samples were treated with hydrofluoric acid and silane and bonded to metallic brackets with orthodontic cement adhesive. Shear bond strength tests were performed using a universal testing machine (n=12). The surface roughness was measured again (intermediate, n=6) after removing the remaining cement adhesive from the ceramic surfaces with a diamond or 24-blade bur after polishing the ceramic surfaces (final, n=6).
The resin matrix ceramic had the highest bond strength. The rotatory instrument used for the removal of cement adhesive did not affect the surface roughness of the resin matrix ceramic or lithium disilicate (p=0.985 and p=0.504, respectively), but did affect the evaluation time (p<0.001) for both restorative materials. The intermediate roughness was the highest. For the resin matrix ceramic, polishing promoted a final surface roughness similar to the initial condition; however, changes in the surface shape of this ceramic could be visibly observed when using a 24-blade bur.
The bond strength of metallic brackets bonded on resin-matrix ceramics is higher than bonding on lithium disilicate. The use of diamond burs for the removal of the remaining adhesive from the resin matrix ceramics is highly recommended.
本研究旨在比较金属托槽与两种不同玻璃陶瓷之间的粘结强度，并评估不同修整方案后的陶瓷表面粗糙度。
测量二硅酸锂和树脂基陶瓷样本的表面粗糙度（初始）。所有样本均用氢氟酸和硅烷处理，并用正畸粘结剂粘结到金属托槽上。使用万能试验机进行剪切粘结强度测试（n = 12）。在用金刚石或24刃车针从陶瓷表面去除剩余粘结剂后（最终，n = 6），再次测量表面粗糙度（中间，n = 6），此前已对陶瓷表面进行抛光（最终，n = 6）。
树脂基陶瓷具有最高的粘结强度。用于去除粘结剂的旋转器械对树脂基陶瓷或二硅酸锂的表面粗糙度没有影响（分别为p = 0.985和p = 0.504），但对两种修复材料的评估时间有影响（p < 0.001）。中间粗糙度最高。对于树脂基陶瓷，抛光后的最终表面粗糙度与初始状态相似；然而，使用24刃车针时，可以明显观察到这种陶瓷表面形状的变化。
粘结在树脂基陶瓷上的金属托槽的粘结强度高于粘结在二硅酸锂上的强度。强烈建议使用金刚石车针从树脂基陶瓷上去除剩余的粘结剂。
