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STUDY ON STRESS INDUCED CORROSION AND LIFETIME OF DENTAL RESIN

Research Project

Project/Area Number 14571872
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 補綴理工系歯学
Research InstitutionASAHI UNIVERSITY

Principal Investigator

GOTO Takayasu  ASAHI UNIVERSITY, SCHOOL OF DENTISTRY, PROFESSOR, 歯学部, 教授 (30121320)

Co-Investigator(Kenkyū-buntansha) KAMEMIZU Hideo  ASAHI UNIVERSITY, SCHOOL OF DENTISTRY, LECTURER, 歯学部, 講師 (00152877)
ADACHI Masanori  ASAHI UNIVERSITY, SCHOOL OF DENTISTRY, ASSOCIATE PROFESSOR, 歯学部, 助教授 (60076057)
DOI Yutaka  ASAHI UNIVERSITY, SCHOOL OF DENTISTRY, PROFESSOR, 歯学部, 教授 (40116067)
Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2002: ¥2,600,000 (Direct Cost: ¥2,600,000)
KeywordsHeat cured denture base resin / Environmental stress cracking / Environmental solution / Fracture toughness / Stess intensity factor / Crack growth velocity / 加熱重合レジン / 床の割れ / クレーズ / 溶解反応 / 架橋材 / 加熱重合アクリルレジン / 割れのメカニズム / 機械化学的反応 / 非線形破壊
Research Abstract

The mechanism of cracking in heat-cured denture base resin was investigated with a view of environmental stress cracking (ESC), by the measurement of fracture toughness (K_<IC>), the analysis of non-linear fracture energy, the measurement of crack growth velocity (V) and the stress intensity factor (K_I), and the observation of fracture surface. Although the K_<IC> depends on the water and the strain rate, the most appropriate value of the specimen with absorbed water was estimated to be about 1.0 MPa. m^<1/2> when the slow crack growth (SCG) never occurred. From the application of the dimensionless load-load point displacement curve, it was found that the plastic energy dissipation rate was greater than the net energy required for the formation of the crack surface. The V of both specimens without and with absorbed water in denture base resins increased with increasing K_I in both ethanol and acetic acid solution, and converged on about 1 μm/s when K_I approached K_<IC>. In case of higher concentration, V converged on the same value even when K_I was small. The V of industrial resin with absorbed water behaved much like denture base resins, but increased without convergence in dried specimen. This was attributed that the water prevented the environmental solutions from diffusing. Furthermore, the fracture surface of any resins with absorbed water showed the striped pattern, but without water the smooth surface appeared at heigh concentration. From these results, it is suggested that the ESC in denture base resin would occur and is considered the follwing mechanisms. (1)The cracking is caused by the dissolution of polymer chain under the presence of both stress and environmental solution, and/or (2)by the rupture of primary polymer chain dur to the direct reaction between chain and environmental solution.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (11 results)

All Other

All Publications (11 results)

  • [Publications] H.Higashino, M., Yamauchi, T.Goto, T.Nagasawa: "Evaluation of brittleness of porcelain fused to pure titanium by fracture toughness, hardness and fracture energy"Dent.Mater.J.. 22(4). 532-542 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Goto, K.Paku, et al.: "Application of the dimensionless load-load point displacement curve to analyze the non-linear fracture parameters of dental resin"J.Gifu Dent.Soc.. 29(3). 180-185 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Paku, T.Goto, et al.: "Influences of strain rate and water on fracture toughness of heat cured denture base acrylic resin"J.Gifu Dent.Soc.. 29(3). 173-179 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Higashino, M.Yamauchi, T.Goto, T.Nagasawa: "Evaluation of brittleness of porcelain fused to pure titanium by fracture toughness, hardness and fracture energy"Dent. Mater. J.. 22(4). 532-542 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Goto, K.Paku et al.: "Application of the dimensionless load-load point displacement curve to analyze the non-linear fracture parameters of dental resin"J. Gifu Dent. Soc.. 29(3). 180-185 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Paku, T.Goto, et al.: "Influences of strain rate and Water on fracture toughness of heat cured denture base acrylic resin"J. Gifu Dent. Soc.. 29(3). 173-1792 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] H.Higashino, M.Yamauchi, T.Goto, T.Nagasawa: "Evaluation of brittleness of porcelain fused to pure titanium by fracture toughness, hardness and fracture energy"Dent.Mater.J.. 22(4). 532-542 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] T.Goto, K.Paku et al.: "Application of the dimensionless load-load point displacement curve to analyze the non-linear fracture parameters of dental resin"J.Gifu Dent.Soc.. 29(3). 180-185 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Paku, T.Goto, et al.: "Influences of strain rate and water on fracture toughness of heat cured denture base acrylic resin"J.Gifu Dent.Soc.. 29(3). 173-179 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] Takayasu Goto, Kenji Paku et al.: "Application of the dimensionless load-load point displacement curve to analyze the non-linear fracture parameters of dental resin"J.Gifu Dent.Soc.. 29(3)(in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] Kenji Paku, Takayasu Goto, et al.: "Influences of strain rate and water on fracture toughness of heat cured denture base acrylic resin"J.Gifu Dent.Soc.. 29(3)(in press). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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