부산대학교 도서관

Soft lining materials for denture bases are sometimes considered advantageous for patients who are capable of delivering a relatively heavy occlusal load to unfavourable denture bearing tissues. These materials have been recommended to prevent excessive pressure on residual alveolar ridges and to provide a more uniform load distribution by absorbing the “mechanical shock” caused by masticatory forces.There are, however, many defects appearing in long-term use in clinics such as color change, degradation, surface roughness, lack of resiliency, and peeling-off from acrylic resin.The purpose of this paper is to discuss the findings of a pilot investigation of the physical and mechanical properties of some soft lining materials in order to analyze their color change and degradation.The results were obtained as follows:1. It seemed that the properties of tensile stress, percent elongation, tensile strength, tear strength, 25% low tensile stress and Durometer A hardness were useful in characterizing the performance characteristics in relation to the color change of the soft lining materials.2. There was considerable variation in the physical and mechanical properties of the soft lining materials examined in this study.