Wieczkowski G, Joynt R B, Davis E L, Yu X Y, Cleary K
State University of New York at Buffalo, School of Dental Medicine.
Oper Dent. 1992 Jan-Feb;17(1):21-5.
This study compared microleakage patterns for glass-ionomer-cement-based resin systems with and without a separating agent placed between the glass ionomer and resin. Results indicated significant leakage (100%) at the dentin glass-ionomer interface for specimens without a separating agent. Those with a separating agent showed almost no leakage between the dentin and glass ionomer (10%) and some leakage at the resin/glass ionomer interface (40%). These results suggest that the forces of polymerization shrinkage are stronger than the chemical bond between glass-ionomer cement and dentin. This bond fails during resin polymerization, eliminating any supplementary retention gained through chemical adhesion to dentin and opening a pathway for microleakage.
本研究比较了在玻璃离子体与树脂之间放置或未放置分离剂的基于玻璃离子水门汀的树脂系统的微渗漏模式。结果表明，未使用分离剂的标本在牙本质与玻璃离子体界面处存在显著渗漏（100%）。使用分离剂的标本在牙本质与玻璃离子体之间几乎没有渗漏（10%），而在树脂/玻璃离子体界面处有一些渗漏（40%）。这些结果表明，聚合收缩力强于玻璃离子水门汀与牙本质之间的化学键。这种键在树脂聚合过程中失效，消除了通过与牙本质化学黏附获得的任何额外固位力，并为微渗漏开辟了一条途径。
