光重合型軟質裏装材の変色について

Abstract

Soft linings to dentures are sometimes considered advantageous for patients who are capable of delivering a relatively heavy occlusal load to unfavourable denture-bearing tissues. The color change of heat and room temperature vulcanized soft lining materials have been discussed. The purpose of this study is to compare the color changes of two visible light curing soft lining materials. Tests were made on samples that were stored in four aqueous solutions and one oleaginous solution for 1, 2, 3, 4, 8 and 12 weeks. The aqueous solutions included saline, turmeric, instant coffee and red color No.102. The oleaginous solutions consisted of olive oil plus β-Caro-tene.The results were obtained as follows:1. Color difference of both visible light curing soft lining materials were larger than conven-tional soft lining materials such as silicone, fluoride and polyorefin.2. Two examined materials had almost the same color differences in both saline and red color No.102.3. Extreme color differences were observed in instant coffee, especially in the “Lite Line”.4. In the comparison of the “Lite Line”, which composed of a polyether urethane dimethacrylate resin material and the “Astron LC”, the former had a greater color difference than the latter in oleaginous solutions.