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Multiple analyses on mechanisms of root fracture in endodontically treated teeth

Research Project

Project/Area Number 16390546
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Conservative dentistry
Research InstitutionOsaka University

Principal Investigator

HAYASHI Mikako  Osaka University, Dental Hospital, Associate Professor, 歯学部附属病院, 講師 (40271027)

Co-Investigator(Kenkyū-buntansha) TAKESHIGE Fumio  Osaka University, Dental Hospital, Associate Professor, 歯学部附属病院, 講師 (60206969)
IWAMI Yukiteru  Osaka University, Graduate School of Dentistry, Assistant Professor, 大学院歯学研究科, 助手 (90303982)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥13,600,000 (Direct Cost: ¥13,600,000)
Fiscal Year 2006: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2005: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥6,300,000 (Direct Cost: ¥6,300,000)
Keywordspost-core restoration / root fracture / fatigue fracture / fractography / resin composite / ceramics / fiber post / endodontically treated teeth / 水中環境 / 亀裂進展 / フラクトグラフィー / レジンコア / 接着性レジンセメント / 破壊抵抗性
Research Abstract

Extracted human upper premolars were restored with a fiber post, prefabricated metallic post or cast metallic post-core. Teeth with full crown preparations without post-core restorations served as a control. All teeth were restored with full coverage crowns. A 90-degree vertical or 45-degree oblique load was applied to the restored teeth with a crosshead speed of 0.5 mm/min, and the fracture loads and mode of fracture were recorded. Fatigue fracture tests were conducted by applying sinusoidal cyclic loads to restored teeth from vertical or oblique directions. Fatigue limits for each restoration were calculated using the staircase approach.
Under the condition of vertical loading, the fracture load of teeth restored with the cast metallic post-cores was greatest among the groups. All fractures in teeth restored with all types of post-core systems propagated in the middle portions of roots, including the apices of the posts. Under the condition of oblique loading, the fracture load of teeth restored with pre-fabricated metallic posts was significantly smaller than that in other groups. Two-thirds of fractures in the fiber post group propagated within the cervical area, while most fractures in other groups extended beyond the middle of the roots. Fatigue fracture resistance of teeth with different restoration methods presented identical patterns in static fracture resistance tests. Fatigue limits of teeth restored with fiber and metallic posts presented 73% of static fracture loads under vertical loading, and 48 and 46% under oblique loading.
From the results of the present investigations, it was concluded that under conditions of vertical and oblique loadings, the combination of a fiber post and composite resin core with a full cast crown is most protective to the remaining tooth structure.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (24 results)

All 2007 2006 2005

All Journal Article (24 results)

  • [Journal Article] Fatigue of tooth-colored restoratives in aqueous environments2007

    • Author(s)
      Takeshige F, Hayashi M. et al.
    • Journal Title

      Dental Materials Journal 26巻・1号

      Pages: 1-6

    • NAID

      110006201205

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Restoring of erosion associated with gastroesophageal reflux result from anorexia nervosa using ceramic laminate veneers : a case report2007

    • Author(s)
      Hayashi M. et al.
    • Journal Title

      Operative Dentistry (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Fatigue behavior of resin composites in aqueous environments2007

    • Author(s)
      Takeshige F., Hayashi M.et al.
    • Journal Title

      Dental Materials (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] The Accuracy of Electrical Method for Microleakage Evaluation by a Three-Dimensional Analysis2007

    • Author(s)
      Iwami Y, Hayashi M, Takeshige F eta
    • Journal Title

      Journal of Dentistry 35(3)

      Pages: 268-274

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Fatigue of Tooth-colored Restoratives in Aqueous Environments2007

    • Author(s)
      Takeshige F, Hayashi M et al.
    • Journal Title

      Dental Materials Journal 26(1)

      Pages: 1-6

    • NAID

      110006201205

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Fatigue Behavior of Resin Composites in Aqueous Environments2007

    • Author(s)
      Takeshige F, Hayashi M et al.
    • Journal Title

      Dental Materials (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Restoring of Erosion Associated with Gastroesophageal Reflux Result from Anorexia Nervosa Using Ceramic Laminate Veneers : a Case Report2007

    • Author(s)
      Hayashi M et al.
    • Journal Title

      Operative Dentistry (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Fatigue of tooth-colored restoratives in aqueous environments2007

    • Author(s)
      Kawakami Y. et al.
    • Journal Title

      Dental Material Journal 26巻・1号

      Pages: 1-6

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Fatigue behavior of resin composites in aqueous environments2007

    • Author(s)
      Takeshige F. et al.
    • Journal Title

      Dental Materials (in press)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Fracture resistance of pulpless teeth restored with post-cores and crowns2006

    • Author(s)
      Hayashi M. et al.
    • Journal Title

      Dental Materials 22巻・5号

      Pages: 477-485

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Relationship between colors of carious dentin and laser fluorescence evaluations In caries diagnosis2006

    • Author(s)
      Iwami Y, Hayashi M. et al.
    • Journal Title

      Dental Materials Journal 25巻・3号

      Pages: 584-590

    • NAID

      110004810984

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] The accuracy of electrical method for microleakage evaluation by a three-dimensional analysis2006

    • Author(s)
      Iwami Y, Hayashi M. et al.
    • Journal Title

      Journal of Dentistry 38巻・3号

      Pages: 268-274

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Fracture Resistance of Pulpless Teeth Restored with Post-Cores and Crowns2006

    • Author(s)
      Hayashi M et al.
    • Journal Title

      Dental Materials 22(5)

      Pages: 477-485

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relationship between Colors of Carious Dentin and Laser Fluorescence Evaluations in Caries Diagnosis2006

    • Author(s)
      Iwami Y, Hayashi M, Takeshige F et al.
    • Journal Title

      Dental Material Journal 25(3)

      Pages: 584-590

    • NAID

      110004810984

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Relationship between colors of carious dentin and laser fluorescence evaluations In caries diagnosis2006

    • Author(s)
      Iwami Y. et al.
    • Journal Title

      Dental Material Journal 25巻・3号

      Pages: 584-590

    • Related Report
      2006 Annual Research Report
  • [Journal Article] The accuracy of electrical method for microleakage evaluation by a three-dimensional analysis2006

    • Author(s)
      Iwami Y. et al.
    • Journal Title

      Journal of Dentistry 38巻・3号

      Pages: 268-274

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Fracture resistance of pulpless teeth restored with post-cores and crowns.2006

    • Author(s)
      Hayashi M.et al.
    • Journal Title

      Dental Materials (in press)

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effect of endodontic irrigation on bonding of resin cement to radicular dentin.2005

    • Author(s)
      Hayashi M.et al.
    • Journal Title

      European Journal of Oral Science 113巻

      Pages: 70-76

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Influence of explorer tip diameter identifying restoration margin discrepancies.2005

    • Author(s)
      Hayashi M.et al.
    • Journal Title

      Journal of Dentistry 33巻

      Pages: 669-674

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Influence of vision of the evaluation of marginal discrepancies in restorations.2005

    • Author(s)
      Hayashi M.et al.
    • Journal Title

      Operative Dentistry 30巻

      Pages: 598-601

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Three-dimensional evaluation of gap formation of cervical restorations.2005

    • Author(s)
      Iwami Y.et al.
    • Journal Title

      Journal of Dentistry 33巻

      Pages: 325-333

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Effect of endodontic irrigation on bonding of resin cement to radiclar dentin2005

    • Author(s)
      Hayashi M et al.
    • Journal Title

      European Journal of Oral Sciences 113号(in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Influence of explorer tip diameter identifying restoration margin discrepancies2005

    • Author(s)
      Hayashi M et al.
    • Journal Title

      European Journal of Oral Sciences 113号(in press)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Influence of vision of the evaluation of marginal discrepancies in restorations2005

    • Author(s)
      Hayashi M et al.
    • Journal Title

      Operative Dentistry 30号(in press)

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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