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1996 Fiscal Year Final Research Report Summary

Stress Analysis of Abutments with Reduced Periodontal support of RPDs.

Research Project

Project/Area Number 07672103
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 InstitutionTohoku University

Principal Investigator

ITOH Hidemi  School of Dentistry, Tohoku University Asociate professor, 歯学部, 講師 (50005104)

Co-Investigator(Kenkyū-buntansha) DATE Kazuhiro  School of Endneer, Tohoku University Professor, 工学部, 教授 (10111254)
Project Period (FY) 1995 – 1996
KeywordsMandibular / Bilsteral Distal Exteusion / Alneolor Defect / Abutment / Photoelastic Mold / Quasi-three-dimensional technique / I-bar clasp
Research Abstract

Prosthodontic cases involving periodontally compromised teeth will increase with a rapidly aging population. The need for an understanding of biomechanical considerations is especially great when designing treatment for periodontally compromised distal extension cases. An examination of load transfer characteristics of abutments and supporting structures in mandibular situations with a variety of periodontal defects was planned. The purpose of this study was to attain information vital to developing new guidelines for partial denture designs with an emphasis on preserving the abutment tceth as long as possible.
In this study, 1) a new stress-analysis system was developed by adding to and improving on observation and recording techniques used in conventional Quasi-Three Dimensional Photoelastic methods of examining stress distribution characteristics in complex situations, and 2) photoclastic models were made to simulate various condition and stresses in the teeth and supporting structur … More es were analyzed. Specifically, models of i) unilateral distal extension cases (432 remaining) with various vertical and horizontal resorption (crater and trough defects for vertical resorption, and horizontal resorption rates of 20% and 35% were used), as well as ii) bilateral distal extension situations with vertical resorption in the first premolar abutment were fabricated. These models were tested against chromatic fringe patterns observed in models of a normal mandibular situation for their load transfer characteristics as load (quantity and direction), splinting, and retention device conditions were changed.
The results showed that, 1) under the same load conditions, the highest stresses over the largest area developed in the model with the largest osseous defect, 2) stress distribution patterns were fundamentally different in models with vertical versus those with horizontal periodontal resorption, 3) two splints were most effective in redistributing loads incurred by periodontally compromised abutment teeth, and 4) the lbar clasp was the most effective in reducing the overall stress at the abutment tooth and producing an uniform stress redistribution. Less

  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 伊藤秀美: "歯科臨床とバイオメカニクス-部分床義歯の新しいガイドラインを求めて-" ザ・クインラッセンス(QE). Year Book. 39-44 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.ITOH: "Effect of Peridontol Support and Fixed Sprinting on load tunsfer by RPD" Jonal of Prosthetic Dentistry. (投稿中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] ITOH.H: "Removsble Partial Detme Designs in Periodoutslly Carprouised Mandible" Jounsl of Dentel Research. 74. 105 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] ITOH.H: "Cross Arch Interaction of Distsl Extension RPDs with Abutments" Jounsl of Dentel Research. 75. 269 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakahara H: "Biomechanics Corpdrisn of Kratochil and Kel I・ban PD Systen" Jounsl of Dentel Research. 76. 293 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 伊藤秀美: "連結歯数の変化に対する歯槽骨欠損をもつ部分床義歯鉤歯の先弾性応力解析" 顎顔面バイオメカニクス学会誌. 第3回学分大会. 8-9 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] A・A・Caputo.J.P.Stand lee: "歯科臨床とバイオメカニクス" 監訳 伊藤秀美 伊達和博, 253 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hidemi Itoh: "Biomechaice in Clinical Dentistry" Year Book. 39-44 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.ITOH: "Effect of Periudental Supporf and Fixed Sphinting on lond fransfer by RPD" J.P.D. (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.ITOH: "Removable Partial Denture in Periodontrlly Compromised Mandible" J.D.R. 105. 74 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.ITOH: "Cross Arch Interaction of Distal Extansion RPDs with Abutments" J.D.R. 269. 75 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Nakahara: "Biomechanics Conparison of Krafochoil and Krol I-ban P D Systems." J.D.R. 293. 76 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hidemi.I: "Stress Analysis of Periodontally Involved RPD Abatments under Vorions Splinting Cordifims" A.O.R. 3. 4-5 (1995)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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