| Project/Area Number |
25463021
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Prosthodontics/ Dental materials science and
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| Research Institution | Showa University |
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Principal Investigator |
INOUE Toshiko 昭和大学, 歯学部, 研究補助員 (90398701)
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| Co-Investigator(Kenkyū-buntansha) |
山本 雅人 昭和大学, 教養部, 准教授 (50277844)
齊藤 誠 昭和大学, 歯学部, その他 (60420915)
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| Project Period (FY) |
2013-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 歯 / 歯質 / 象牙質 / 強度特性 / 歯根 / 人歯 / 加齢 / マイクロＣＴ / 微小硬さ / 引張強さ / セメント象牙境 / エナメル象牙境 |
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| Outline of Final Research Achievements |
The dentin-enamel junction is a unique biological interface between the enamel and dentin in teeth. We investigated the anisotropic tensile strength of this region in human teeth by examining tensile loading in parallel versus perpendicular orientations. We found that the presence of structural anisotropy in dentin-enamel junctions. Additionally, transparent dentin is known to develop in tooth roots with aging. In this study, we investigated the structural and mechanical properties of the transparent dentin region. Transparent dentin is weaker than normal dentin, which may explain the occurrence of root dentin fractures in aged individuals. Moreover, we observe the surface of dentin slabs exposed to ultraviolet light from an excimer lamp. The water contact angle was measured. UV-irradiated dentin exhibited increased surface wettability. We confirm that irradiation with ultraviolet light is a useful method of surface modification.
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| Academic Significance and Societal Importance of the Research Achievements |
口腔領域は摂食をはじめとして多くの重要な機能を担っており，歯の強度特性を検討することは歯科医療においても修復物設計の指針となり，重要であると思われる．超高齢化社会の到来とともに，歯を保存することが高齢者のQOLを維持するために重要な要因であることが認識されている．歯がどのような強度分布をしているかを知ることは高齢者などの歯の破折を防ぐための修復物の設計には必要不可欠な情報であり，意義の高いことと考えられる．
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