Mechanical Properties of An Experimental Soft Lining Material Based on Urethane Oligomer

概要

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The purpose of this study was to investigate the apparent viscosities and mechanical properties of two experimental lightcuring soft lining materials (SLM-1 and SLM-2) based on soft-type urethane oligomers, as well as the shear bond strength and dye penetration between the denture base resin and the polymerized SLMs after storage in water. The apparent viscosities of SLM-1 and SLM-2 were 144.0-146.9 and 1.9 Pa・s respectively. After storage in water for two prescribed periods (one day and three months), the mechanical properties of the SLMs on the overall were 10.6-20.6MPa for elastic modulus, 69.3-72.1 for hardness, and 3.8-4.0MPa for adhesive strength. Tensile strength was observed to decrease after three months' storage in water, when compared to that after one-day storage (p<0.01). Water sorption rates also differed significantly (p<0.05)-namely 3.0 and 2.8mg/cm^2 for SLM-1 after one day and three months respectively, and 2.0 and 2.2mg/cm^2 for SLM-2. As for dye penetration, no infiltration was observed at the denture base resin-SLM interface after three months' storage. Based on the results of this study, it seemed like the SLMs possess many suitable properties for use with a new technique that we recently developed for preparing denture base resin and soft lining material.
日本歯科理工学会の論文