Hashimoto Masanori, Fujita Shinichi, Nagano Futami, Ohno Hiroki, Endo Kazuhiko
Division of Biomaterials and Bioengineering, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Japan.
Eur J Oral Sci. 2010 Aug;118(4):404-10. doi: 10.1111/j.1600-0722.2010.00744.x.
The purpose of this study was to evaluate the durability of resin-dentin bonds in 10-yr water-storage testing. Resin-dentin bonded bulk specimens were prepared using six commercially available resin adhesives. The resin-dentin bonded specimens were stored in water for 24 h (control group) or for 10 yr (experimental groups). After each storage period, the specimens were sectioned to make specimen beams and then subjected to a microtensile bond test. After the bond test, fractured surfaces were examined by scanning electron microscopy (SEM). In addition, interfacial observation of silver nanoleakage was performed using the backscatter electron mode of SEM. The bond strengths of four of the six adhesive systems tested decreased significantly after 10 yr. However, no significant bond-strength reduction was recorded for the other two systems. The interfacial observations showed water tree propagation in the bonding resin layer as a typical morphological change after aging for five of the six adhesives tested. Water tree propagation may be a symptom of degradation in the resin bonding layer of resin-dentin bonds.
本研究的目的是评估树脂-牙本质粘结在10年水储存测试中的耐久性。使用六种市售树脂粘结剂制备树脂-牙本质粘结块状标本。将树脂-牙本质粘结标本在水中储存24小时（对照组）或10年（实验组）。在每个储存期后，将标本切片制成标本梁，然后进行微拉伸粘结试验。粘结试验后，通过扫描电子显微镜（SEM）检查断裂表面。此外，使用SEM的背散射电子模式对银纳米渗漏进行界面观察。测试的六种粘结剂系统中有四种的粘结强度在10年后显著降低。然而，另外两种系统未记录到显著的粘结强度降低。界面观察显示，在测试的六种粘结剂中有五种老化后，粘结树脂层中出现水树扩展，这是一种典型的形态变化。水树扩展可能是树脂-牙本质粘结的树脂粘结层降解的一种表现。
