Evaluation of quality of interface between resin cements and tooth by using newly modality of ultrasonic measurement

本研究的目的是利用超声装置评估树脂胶结物的早期凝固行为和弹性模量的变化。将样品放置在有或没有底漆的样品台上，以0（无辐照）、200和600mW/cm^2的功率密度进行固化。通过树脂水泥的传递时间除以试样厚度，得到材料内部的纵向超声速度。从结果来看，所有树脂胶结物在辐照后都有增加超声速度的趋势，但这种趋势各不相同。此外，辐照条件和加不加底漆对树脂胶结物的早期凝结性能和弹性模量也有影响。

The purpose of this study was to evaluate the early setting behavior, changes in the elastic modulus, of resin cements by using ultra sonic device. The specimens were placed on the sample stage with or without primer and cured with power densities of 0(no irradiation), 200 and 600mW/cm^2. The transit time through the resin cement was divided by the specimen thickness and then the longitudinal ultrasound velocity within material was obtained. From the results, all resin cements tended to towards increasing ultrasound velocity after irradiation however this tendency was different from each other. In addition, irradiation condition and with or without primer influenced on early setting behavior and elastic modulus of resin cements.