| Project/Area Number |
05671642
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | Matsumoto Dental College |
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Principal Investigator |
TAKAMATA Tetsuya Matsumoto Dental College, Department of Dental Diagnostic Sciences, Professor, 歯学部, 教授 (50064689)
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| Co-Investigator(Kenkyū-buntansha) |
KUROIWA Akihiro Matsumoto Dental College, Department of Removable Prosthodontics, Instructor, 歯学部, 講師 (10195571)
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| Project Period (FY) |
1993 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥600,000 (Direct Cost: ¥600,000)
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| Keywords | Soft Lining Materials / Color Change / Degeneration |
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| Research Abstract |
A pilot investigation of the physical and mechanical properties of some commercial soft lining materials was discussed. There was considerable variation in the physical and mechanical properties of the soft lining materials examined in this study. 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.
A relationship between the physical and mechanical properties and color change of soft lining materials was also analyzed. The soft liner selected in this study was condensation RTV silicone rubber material. The cause and effect relationship of the degree of color change and physical properties of condensation RTV silicone rubber material was not apparent. It was considered that the physical and mechanical properties for soft liner were influenced by acidity of solutions. It seemed that the relationship between color change and degeneration of soft liners should be analyzed under a bacterial environment in the future. The other hand, the influence for molecular structures of color changed acrylic and polyorefin materials was analyzed by Gel Permeation Chromatography (GPC). A molecular weight and/or molecular number of the acrylic materials were not apparent in aqueous solutions for three months. However, the Polyorefin materials changed in oleaginous solution. This result suggested that the impregnated oil to the material was oxidized and the molecular structures were changed.
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