Department of Orthodontics, University Medical Centre Regensburg, 93053, Regensburg, Germany.
Department of Prosthetic Dentistry, University Medical Centre Regensburg, 93053, Regensburg, Germany.
Sci Rep. 2021 Aug 16;11(1):16611. doi: 10.1038/s41598-021-96164-3.
To evaluate the shear bond strength (SBS) of different attachment materials used for lingual bonding, the influence of artificial aging and the radii of curvature of the enamel surface on SBS, 192 third molars were photographed to determine the radius of curvature of the oral surface. After phosphoric acid etching a cylindrical test piece was bonded to the oral enamel using a mold that was filled with a chemically curing (Maximum Cure, Transbond IDB Premix) or a dual-curing (Nexus NX3, RelyX Unicem2) attachment material. SBS was tested after 24 h, 500 thermal cycles or 90 days at 37 °C with a universal testing machine. Computed tomography scans were performed to determine the bonded surface and calculate SBS. Values ranged from 8.3 to 20.9 MPa. RelyX Unicem2 showed the highest SBS values at baseline, 500 thermal cycles and after 90 days (p < 0.001). Ninety days of wet storage significantly reduced SBS of Maximum Cure (p = 0.028). The radius of curvature correlated positively with SBS (r = 0.204, p = 0.005). The SBS of all attachment materials was sufficient for clinical use, even after artificial aging. RelyX Unicem2 showed almost twice as high SBS values as the other attachment materials.
为了评估用于舌侧粘接的不同粘接材料的抗剪粘接强度（SBS），评估人工老化和牙釉质表面曲率半径对 SBS 的影响，拍摄了 192 颗第三磨牙的照片，以确定口腔表面的曲率半径。磷酸酸蚀后，使用充满化学固化（最大固化，Transbond IDB Premix）或双重固化（Nexus NX3，RelyX Unicem2）粘接材料的模具将圆柱形试件粘接到口腔牙釉质上。在 24 小时、500 次热循环或 37°C 下 90 天后，使用万能试验机测试 SBS。进行计算机断层扫描以确定粘接表面并计算 SBS。值范围为 8.3 至 20.9 MPa。RelyX Unicem2 在基线、500 次热循环和 90 天后表现出最高的 SBS 值（p < 0.001）。90 天的湿存储显着降低了 Maximum Cure 的 SBS（p = 0.028）。曲率半径与 SBS 呈正相关（r = 0.204，p = 0.005）。所有粘接材料的 SBS 都足以满足临床使用要求，即使经过人工老化。RelyX Unicem2 的 SBS 值几乎是其他粘接材料的两倍。
