Hashimoto Masanori, Nakamura Kouichi, Feilzer Albert J
Division of Biomaterials and Bioengineering, Health Sciences University of Hokkaido, School of Dentistry, 1757 Kanazawa, Ishikari-Tobetsu, Hokkaido 061-0293, Japan.
Dent Mater. 2009 Jul;25(7):852-6. doi: 10.1016/j.dental.2009.01.005. Epub 2009 Feb 8.
This study hypothesizes that, with enamel or dentin as a bonding substrate, intrinsic water affects the development of polymerization contraction stress in the bonds of self-etching adhesives during bonding.
The influence of the water content in dentin and enamel (wetness with water as control and acetone-dried specimens) on the stress development in self-etching adhesives was determined with a tensilometer. Thin layers of self-etching primer and/or adhesive resins were created between a glass plate and a flat enamel or dentin surface.
After an initial maximum shortly after light curing for 30min, the contraction stress was decreased in the dentin (30-70%) and enamel (approximately 20%). In the acetone-dried specimens, the stress was continuously increased for 20-50%.
The intrinsic water content of tooth tissue influences the initial polymerization of polymers. This effect is favorable for stress relief in resin restoration but causes unwanted nanoleakage channel formation in resin-tooth bonds.
本研究假设，以牙釉质或牙本质作为粘结底物时，固有水分会影响自酸蚀粘结剂在粘结过程中聚合收缩应力的产生。
用拉力计测定牙本质和牙釉质中的含水量（以水湿润作为对照，丙酮干燥的标本）对自酸蚀粘结剂应力产生的影响。在玻璃板和平坦的牙釉质或牙本质表面之间制备自酸蚀底漆和/或粘结树脂薄层。
光固化30分钟后，最初出现一个最大值，随后牙本质中的收缩应力降低（30 - 70%），牙釉质中的收缩应力降低约20%。在丙酮干燥的标本中，应力持续增加20 - 50%。
牙齿组织的固有含水量会影响聚合物的初始聚合。这种效应有利于树脂修复体中的应力释放，但会在树脂与牙齿的粘结中导致不必要的纳米渗漏通道形成。
