| Project/Area Number |
15390593
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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 | 一般 |
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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, Graduate School of Biomedical Sciences, Professor, 大学院・医歯薬学総合研究科, 教授 (50034244)
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| Co-Investigator(Kenkyū-buntansha) |
MURATA Hiroshi Hiroshima University, Hospital, Instructor, 病院・講師 (40229993)
HONG Guang Hiroshima University, Graduate School of Biomedical Sciences, Assistant, 大学院・医歯薬学総合研究科, 助手 (70363083)
NISHIMURA Masahiro Hiroshima University, Graduate School of Biomedical Sciences, Assistant, 大学院・医歯薬学総合研究科, 助手 (00294570)
MAKIHIRA Seityo Hiroshima University, Hospital, Assistant, 病院・助手 (80304450)
川村 真弓 広島大学, 医学部・歯学部附属病院, 助手 (20346513)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥14,700,000 (Direct Cost: ¥14,700,000)
Fiscal Year 2004: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 2003: ¥12,200,000 (Direct Cost: ¥12,200,000)
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| Keywords | Resilient denture liner / Viscoelasticity / High durability / Gerodontology / Plasticizer / Gelation |
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| Research Abstract |
Recently various soft denture liners were developed and used in the clinical situations. Mainly, acrylic and silicone type materials were available. From the standpoint of masticatory function, acrylic soft denture liners with viscoelastic properties are more advantageous than silicone with elastic properties. However, from the standpoint of durability, acrylic materials were not advantageous compare with silicone. Furthermore, phthalic esters are considered to be Environmental Hormones. From the viewpoint of dimensional stability, the procedure of relining of dynamic impression surface by visible-light polymerization is better than that of the laboratory-processed method. The purpose of this study was to develop the visible light-polymerized, resilient denture liners with high durability and high degree of stress relief using dibutyl sebacate.
In 2003, the measuring method of dynamic viscoelasticity was established. Then, the relationship between viscoelasticity, and monomer type and plasticizer content, and influence of monomer type on setting characteristics were evaluated. Analysis of surface characteristics were also determined.
In 2004, influence of each factor on gelation characteristics f temporary soft liners was evaluated. Then, influence of monomer type and plasticizer content on glass transition temperature and adhesive to denture base resins were determined. Frequency -dependent properties of visible light-polymerized resins were also evaluated. The results suggested that iso-butyl methacrylate monomer containing 50% plasticizer would be suitable for the liquid of acrylic resilient denture liners. We are now conducting the clinical experiment. The paper concerning study on the mechanical properties of the acrylic resilient denture liners is under consideration.
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