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軟質リライン材およびティッシュコンディショナーの粘弾性性質、硬さおよびガラス転移温度の評価
No full textSoft denture liners and tissue conditioners are widely used for the denture patients to cushion masticatory force and condition abused tissues, respectively. This study assessed methods for the evaluation of the viscoelasticity and glass transition temperature (Tg) of the silicone permanent soft liner, acrylic permanent soft liner, and tissue conditioner. Three rheological parameters of storage modulus (E′), loss modulus (E′′), and loss tangent (tanδ), Tg, and hardness were determined using dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), and the Shore A0 hardness test. Five specimens were measured for each material. The time–temperature superposition principle was applied to produce master curves of E′, E′′, and tanδ for the tested materials at a reference temperature of 37 °C. The acrylic permanent soft liner and tissue conditioner exhibited viscoelastic behavior and sensitivity to frequency, especially at lower frequencies. The silicone permanent soft liner showed elastic behavior and was frequency-independent. Tg for the acrylic permanent soft liner was higher than that for the tissue conditioner, which in turn was higher than that for the silicone permanent soft liner for both DMA and DSC. In DMA, a higher frequency led to higher Tg values. A positive linear relationship was found between Shore A0 hardness and E′ values, but not E′′ and tanδ values. Shore hardness reflects elasticity, but not viscosity. The results of the present study can be used to improve methods for evaluating the viscoelasticity and Tg of soft denture liners and tissue conditioners.長崎大学学位論文 学位記番号:博(医歯薬)甲第1211号 学位授与年月日:令和2年3月4
Efficient Synthetic Reactions Utilizing Hybrid Catalysts Composed of Hydrolases and Inorganic Nanosheets
No full text長崎大学学位論文 学位記番号:博(工)甲第83号 学位授与年月日:令和2年3月19
病原真菌Candida glabrataにおけるElm1の抗真菌薬感受性および病原性への関与
No full text長崎大学学位論文 [学位記番号]博（医歯薬）甲第1275号 [学位授与年月日]令和2年9月2
