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Dynamic Fatigue Properties of Human Teeth

Research Project

Project/Area Number 01440079
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field 補綴理工系歯学
Research InstitutionTokyo Medical and Dental University

Principal Investigator

NISHIMURA Fumio  TOKYO MED & DENT.UNIV., FAC.of DENT.,Professor, 歯学部, 教授 (10013856)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Hideo  TOKYO MED & DENT.UNIV., FAC.of DENT.,Research Associate, 歯学部, 助手
WATARI Fumio  TOKYO MED & DENT.UNIV., FAC.of DENT.,Research Associate, 歯学部, 助手 (70158682)
OKAZAKI Kunio  TOKYO MED & DENT.UNIV., FAC.of DENT.,ex-Research Associate, 歯学部, 元助手 (90150292)
TAKAHASHI Hidekazu  TOKYO MED & DENT.UNIV., FAC.of DENT.,Lecturer, 歯学部, 講師 (90175430)
NOMTO Sunao  TOKYO MED & DENT.UNIV., FAC.of DENT.,ex-Professor, 歯学部, 元教授 (10013799)
Project Period (FY) 1989 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥24,400,000 (Direct Cost: ¥24,400,000)
Fiscal Year 1992: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1991: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 1990: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1989: ¥17,800,000 (Direct Cost: ¥17,800,000)
KeywordsTOOTH / DENTIN / DENTAL MATERIALS / FATIGUE TEST / FATIGUE LIMIT / RESTRATIVE MATERIALS / SENILITY / DYNAMIC TEST / 歯質 / 疲労 / 老化現象 / 負荷波形 / 亀裂伸展速度 / SーN曲線 / 歯根 / スクリュ-ポスト / 脆性材料 / 動的機能解析
Research Abstract

K_<IC> of human enamel was examined by means of IM methods. K_<IC> of old man's teeth was 0.61 MPa.m^<1/2> in 1 and 0.77 MPa.m^<1/2> in 7 and the difference was significant (P<0.01). K_<IC> differed much from the direction of the indenter pressed to enamel rods and was 0.61 MPa.m^<1/2> in the direction of V, 0.66 MPa.m^<1/2> in the direction of H and 0.84 MPa.m^<1/2> in the direction of I, and the difference was significant (P<0.01). The values for a young man's permanent teeth was slightly higher but showed a similar inclination to an old man's teeth. K_<IC> of human enamel irradiated by CO_2 laser showed decreasing tendency in all irradiated spots.
A new tensile fatigue testing methods using a stainless steel screw was introduced. The preferred applied load waveform was the cyclic haver-triangle load because of the small coefficient of variance. Statistical definition of the fatigue limit at 10^5 stress cycles, was obtained by testing according to the staircase method. In 37゚C water, fatigue limit of gallium alloy was 29.5 MPa, and that of high copper amalgam was 26.9 MPa.
In general, fatigue limit of young man's dentin was higher, and did not fractured within 60,000 cycles of stress in spite of high maximum applied stress of 34 MPa. But old man's dentin fractured easily within 20,000 cycles of stress in spite of low maximum applied stress of 28 MPa. Fracture surface of fatigue-tested dentin specimens were evaluated using SEM. In the crack origin zone of dentin, several large dentin tubules were seen. And these tubules were thought to act as a defect, and stress concentration were occurred at this region.

Report

(5 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • 1989 Annual Research Report
  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] Fumio NISHIMURA: "A New Procedure of the Tensile Fatigue Test for Dental Materials" Dental Materials Journal. 11(2). 141-149 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 西村 文夫: "歯冠修復材料の疲労特性" 口腔病学会雑誌. 59(3). 553-561 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 中村 英雄: "歯質の動的疲労破壊についてースクリューポストのある模擬歯根による実験的研究ー" 歯科材料・器械. 11(S19). 74-75 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 岡崎 邦夫: "歯科用りん酸亜鉛セメントの疲労について" 歯科材料・器械. 9(6). 871-877 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 岡崎 邦夫: "炭酸ガスレーザーを照射した人歯エナメル質の破壊靭性について" 歯科材料・器械. 9(3). 487-494 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Fmio NISHIMURA: "A New Procedure of the Tensile Fatigue Test for Dental Materials" Dental materials Journal.11(2). 141-149 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Fumio NISHIMURA: "Fatigue Properties of Restorative Dental Materials" The J.of the Stomatological Soc. 59(4). 553-561 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Hideo NAKAMURA: "Dynamic Fatigue Properties of Tooth-Experimental Study using Imitation Root with Screw Post" The J.of The Jap.Soc.for Dental Materials and Devices. 11(S19). 74-75 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kunio OKAZAKI: "Fatigue Properties of Dental Zinc Phosphate Cement" The J.of The Jap.Soc.for Dental Materials and Devices. 9(6). 871-877 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kunio OKAZAKI: "Fracture Toughness of Human Enamel Irradiated by CO_2 Laser" The J.of The Jap.Soc.for Dental Materials and Devices. 9(3). 487-494 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Fumio NISHIMURA: "A New Procedure of the Tensile Fatigue Test for Dental Materials" Dental Materials Journal. 11(2). 141-149 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 西村 文夫: "歯冠修復材料の疲労特性" 口腔病学会雑誌. 59(3). 553-561 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 中村 英雄: "歯質の動的疲労破壊について-スクリューポストのある模擬歯根による実験的研究-" 歯科材料・器機. 11(S19). 74-75 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 岡崎 邦夫: "歯科用りん酸亜鉛セメットの疲労について" 歯科材料・器機. 9(6). 871-877 (1990)

    • Related Report
      1992 Annual Research Report
  • [Publications] 岡崎 邦夫: "炭酸ガスレーザーを照射した人歯エナメル質の破壊靭性について" 歯科材料・器機. 9(3). 487-494 (1990)

    • Related Report
      1992 Annual Research Report
  • [Publications] 岡崎 邦夫: "人歯エナメル質の破壊靭性について" 歯科材料・器械. 8. 382-387 (1989)

    • Related Report
      1991 Annual Research Report
  • [Publications] 岡崎 邦夫: "歯科材料の疲労試験" 歯科材料・器械・特別号. 9. 163-163 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 岡崎 邦夫: "歯科材料の疲労試験(第二報)" 歯科材料・器械・特別号. 9. 102-103 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 岡崎 邦夫: "炭酸ガスレ-ザ-を照射した人歯エナメル質の破壊靭性について" 歯科材料・器械. 9. 487-494 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 岡崎 邦夫: "歯科用りん酸亜鉛セメントの疲労について" 歯科材料・器械. 9. 871-877 (1990)

    • Related Report
      1991 Annual Research Report
  • [Publications] 西村 文夫: "歯質の動的疲労破壊について" 歯科材料・器械. 11. (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 岡崎 邦夫: "歯科材料の疲労試験" 歯科材料・器械・特別号. 9. 163-163 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡崎 邦夫: "歯科材料の疲労試験(第二報)" 歯科材料・器械・特別号. 9. 102-103 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡崎 邦夫: "炭酸ガスレ-ザ-を照射した人歯エナメル質の破壊靭性について" 歯科材料・器械. 9. 487-494 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡崎 邦夫: "歯科用りん酸亜鉛セメントの疲労について" 歯科材料・器械. 9. 871-877 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 岡崎邦夫: "炭酸ガスレ-ザ-を照射した人歯エナメル質の破壊靱性について" 歯科材料・器械. 9. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 岡崎邦夫: "歯科材料の疲労試験" 歯科材料・器械・特別号. 9. (1990)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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