| Project/Area Number |
10557184
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
補綴理工系歯学
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| Research Institution | HIROSHIMA UNIVERSITY |
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Principal Investigator |
HAMADA Taizo Hiroshima University, Faculty of Dentistry, Professor, 歯学部, 教授 (50034244)
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| Co-Investigator(Kenkyū-buntansha) |
NIKAWA Hiroki Hiroshima University, Dental Hospital, Lecturer, 歯学部・附属病院, 講師 (10228140)
SADAMORI Shinsuke Hiroshima University, Faculty of Dentistry, Associate Professor, 歯学部, 助教授 (40187167)
MURATA Hiroshi Hiroshima University, Faculty of Dentistry, Instructor, 歯学部, 助手 (40229993)
MAKIHARA Seityo Hiroshima University, Dental Hospital, Instructor, 歯学部・附属病院, 助手 (80304450)
KUMAGAI Hiroshi Hiroshima University, Dental Hospital, Instructor (60284212)
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| Project Period (FY) |
1998 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 2001: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2000: ¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1999: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1998: ¥6,000,000 (Direct Cost: ¥6,000,000)
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| Keywords | Soft denture liners / Viscoelastic properties / Masticatory function / Tissue conditioners / Stress relaxation behavior / 組織調整剤 |
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| Research Abstract |
We evaluated the static viscoelastic properties and setting characteristics of commercial resilient denture liners and tissue conditioners. Relationship between molecular weight of polymer powders and powder/liquid ratio, and stress relaxation behavior of the tissue conditioners were also determined. Solubility and absorption of water of these materials were measured. Previously measurement of static viscoelastic properties was employed to evaluate physical properties of soft denture liners. However, we used the dynamic mechanical analysis in order to determine the physical properties more rigorously. The same generic materials showed the same viscoelastic properties, and the wide range of these properties was observed among the materials. Furthermore, we evaluate the relationship between the dynamic viscoelasticity of soft liners and masticatory function. This study demonstrated that the improvement of masticatory function was found to be greater in the soft liners having viscoelastic properties than those having elastic properties. As stated above, poly (butyl methacrylate) or similar polymer are found to be suitable for the powder of tissue conditioners. Also the acrylic polymer is found to be suitable for the resilient denture liners. We have evaluated the influence of plasticizer type and its content on dynamic viscoelasticity. We planed to evaluate the relationship between monomer type and some properties such as viscoelastic properties, solubility and absorption in order to develop the acrylic resilient denture liners having high durability.
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