Chowdhury Abu Faem Mohammad Almas, Alam Arefin, Yamauti Monica, Álvarez Lloret Pedro, Saikaew Pipop, Carvalho Ricardo Marins, Sano Hidehiko
Department of Restorative Dentistry, Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
Department of Conservative Dentistry and Endodontics, Sapporo Dental College and Hospital, Plot 24, Sector 8, Dhaka 1230, Bangladesh.
Polymers (Basel). 2021 Mar 25;13(7):1009. doi: 10.3390/polym13071009.
This study evaluated an experimental two-step self-etch adhesive (BZF-29, BZF) by comparing it with a reference two-step self-etch adhesive (Clearfil Megabond 2, MB) and a universal adhesive (G-Premio Bond, GP) for microtensile bond strength (μTBS) and resin-dentin interfacial characteristics. Twenty-four human third molars were used for the μTBS test. Bonded peripheral dentin slices were separated to observe the resin-dentin interface and measure the adhesive layer thickness with SEM. μTBS data of the central beams were obtained after 24 h and 6 months of water storage. Fracture modes were determined using a stereomicroscope and SEM. Nine additional third molars were used to determine the elastic modulus (E) employing an ultra microhardness tester. Water storage did not affect μTBS of the tested adhesives ( > 0.05). μTBS of BZF and MB were similar but significantly higher than GP ( < 0.05). BZF achieved the highest adhesive layer thickness, while GP the lowest. E of BZF and MB were comparable but significantly lower than GP ( < 0.05). Except for GP, the predominant fracture mode was nonadhesive. The superior bonding performance of BZF and MB could be attributed to their better mechanical property and increased adhesive thickness imparting better stress relief at the interface.
本研究通过将一种实验性两步自酸蚀粘结剂（BZF-29，BZF）与一种对照两步自酸蚀粘结剂（Clearfil Megabond 2，MB）以及一种通用粘结剂（G-Premio Bond，GP）进行比较，评估了其微拉伸粘结强度（μTBS）和树脂-牙本质界面特征。使用24颗人类第三磨牙进行μTBS测试。分离粘结的周边牙本质切片以观察树脂-牙本质界面，并用扫描电子显微镜（SEM）测量粘结剂层厚度。在水储存24小时和6个月后获得中央梁的μTBS数据。使用体视显微镜和SEM确定断裂模式。另外使用9颗第三磨牙，采用超微硬度测试仪测定弹性模量（E）。水储存对测试粘结剂的μTBS没有影响（>0.05）。BZF和MB的μTBS相似，但显著高于GP（<0.05）。BZF的粘结剂层厚度最高，而GP的最低。BZF和MB的E相当，但显著低于GP（<0.05）。除GP外，主要断裂模式为非粘结性。BZF和MB卓越的粘结性能可归因于它们更好的机械性能以及增加的粘结剂厚度，从而在界面处提供更好的应力释放。
