Yanagawa T, Finger W J
Department of Operative Dentistry, Showa University School of Dentistry, Tokyo, Japan.
Am J Dent. 1994 Jun;7(3):157-60.
The purpose of the present study was to investigate the relationship between shear bond strength (SBS) to dentin and degree of polymerization of resin adjacent to the coupling interface. A hybrid-type resin composite was polymerized on Gluma-treated dentin at thicknesses of 1, 2, 3 and 5 mm, respectively, with seven different light activation times (LAT) from 3 through 180 seconds. SBS of the specimens was determined 10 minutes after the end of light activation. The degree of polymerization of resin close to the dentin interface was determined by Wallace Indentation Depth (WID) of specimens polymerized under the same conditions as the SBS samples, however, separated from the dentin surface by a thin glass plate. Consistent relationships were found for SBS vs. LAT and WID vs. LAT by regression analyses (y = A+B/x). There was a strong linear correlation between SBS and WID (r = -0.93), indicating that the early bond strength to Gluma-treated dentin is a function of mechanical characteristics of resin close to the bonding interface.
本研究的目的是调查牙本质剪切粘结强度（SBS）与偶联界面附近树脂聚合度之间的关系。将一种混合型树脂复合材料分别以1、2、3和5毫米的厚度聚合在经Gluma处理的牙本质上，光照激活时间（LAT）为7种不同时间，从3秒到180秒。在光照激活结束10分钟后测定样本的SBS。靠近牙本质界面的树脂聚合度通过华莱士压痕深度（WID）来确定，样本的聚合条件与SBS样本相同，但通过一块薄玻璃板与牙本质表面分离。通过回归分析（y = A+B/x）发现SBS与LAT以及WID与LAT之间存在一致关系。SBS与WID之间存在很强的线性相关性（r = -0.93），表明对经Gluma处理的牙本质的早期粘结强度是靠近粘结界面树脂机械特性的函数。
