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2001 Fiscal Year Final Research Report Summary

Evaluation on the mechanical properties and biocompatibility of the FRP esthetic orthodontic wire for clinical application

Research Project

Project/Area Number 10357019
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 矯正・小児・社会系歯学
Research InstitutionHokkaido University

Principal Investigator

SATO Yoshiaki  Hokkaido Univ. Grad. School of Dental Medicine Instructor, 大学院・歯学研究科, 講師 (00250465)

Co-Investigator(Kenkyū-buntansha) WATARI Fumio  Hokkaido Univ. Grad. School of Dental Medicine Prof., 大学院・歯学研究科, 教授 (70158682)
YAMAGATA Syuichi  Hokkaido Univ. Grad. School of Dental Medicine Instructor, 大学院・歯学研究科, 助手 (70292034)
YAMAMOTO Takaaki  Hokkaido Univ. Grad. School of Dental Medicine Instructor, 大学院・歯学研究科, 講師 (40230560)
KOBAYASHI Masahiro  Tiba Institute of Technology Asso. Prof., 工学部, 助教授 (20083868)
UO Motohiro  Hokkaido Univ. Grad. School of Dental Medicine Asso. Prof., 大学院・歯学研究科, 助教授 (20242042)
Project Period (FY) 1998 – 2001
KeywordsFRP wire / orthodontic treatment / mechanical property / improved bracket / edgewise bracket / fictional property
Research Abstract

The evaluation on the mechanical properties and biocompatibility of the FRP esthetic orthocontic wire for clinincal appoication is the aim of this research. The results are as follows:
1. After the FRP wire have been immersed in mechanical properties through water immersion. The deactivating load and elastic recovery in s hysterisis loop decreased much after water immersion. To prevent this, Bis-GMA was coated by R&D method. The FRP with this coating by the method of R&D with dipping speed 1 cm/min., showed sufficient rtention of flesural load (D/L 60-80 %) and good elastic recovery even after 30 days.
2. To develop the FRP wires in combination with biocompatible CaO-P_2O_5-SiO_2-Al_2O_3 (CPSA) glass fibers and PMMA matrix by hot drawing method, a photo cure polymerization method was applied to form the rectangular timber with a sufficient torque force. The FRP wire using dental composite resin for matrix showed a torsional load of 1/2 of Ni-Ti wire. This showed that the fiber content mainly contributes to flexural load while the use of stigg materials for the matrix is much more effective for improbing torsional properties.
3. To avoid the shear force exerted by ligatures, improved brackets with various radius curvature were evaluated. The limit of deflection of the FRP wire and the recovery of the elastic properties improved with the larger radius curvatures. It was also clarified from ligated bending test that good elastic recovery and high load-retention could be obtained.
4. The frictional properties between orthodontic wires and brackets and frictional coefficients were obtained under conditions of single contact plane and double contact planes. The friction properties of FRP wire with brackets were similar to those of metal wires expect for the polycrystalline alumina bracket.

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] 永山 和典 他: "審美性矯正ワイヤーの水中浸漬による影響とコーティング処理に関する研究"北海道歯誌. 19. 197-214 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Imai et al.: "Mechanical properties and aesthetics of FRP or thedontic wire fabricated by hot drawiy"Biomaterials. 19. 2195-2200 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 豊泉 裕 他: "光重含法による曲げおよびねじり剛性を有する審美性矯正ワイヤーの試作"歯科材料・器械. 18. 429-440 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Imai et al.: "Effects of water immersion on mechanical preperties of new esthetic or thadentic wire"An. J. Orthod. Dentfacial Orthop.. 116. 533-538 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 宇賀大 他: "審美矯正ワイヤーに適したブラケットの試作"歯科材料・器械. 19. 553-564 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 諏訪 伸輔 他: "審美性繊維強化プラスチックおよび各種矯正ワイヤーとブラケット間の懸垂式摩擦試験による摩擦特性評価"歯科材料・器械. 20. 372-379 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山方秀一 他: "各種市販矯正用Ti-TVi合金ワイヤーの変態擬弾性の比較"北海道歯学雑誌. 19. 70-79 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Imai, T.: "Temprature-dependence of the Mechanical properties of FRP Orthedontic wire"Dental Materials Jourual. 18. 167-175 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 山方 秀一: "生体親和性ガラスクロスを用いた保定床の簡便な強化法"北海道矯正歯科学会誌. 29. 11-15 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yamagata, S. et al.: "Comprison of the transformation pseudoelasticity of various Ti-Ni alloy archwire products"Hokkaido J. Dental Science. 19. 70-79 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nagayama, K. et al.: "Effect of water Immersion and surface treatment on esthetic orthodontic wires"Hokkaido J. Dental Science. 19. 197-214 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Imai, T. et al.: "Mechanical properties and aesthetics of FRP orthodontic wire fabricated by hot drawing"Biomaterials. 19. 2195-2200 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toyoizumi, H. et al.: "Fabrication of aesthetic wires with flexural and torsional stiffness by photo curing method"J. Japanese Society for Dental Materials and Devices. 18. 429-440 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Imai, T. et al.: "Effects of water Immersion on mechanical properties of new esthetic orthodontic wire"Am. J. Orhod. Denfac. Orthoped.. 116. 533-538 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Imai, T. et al.: "Temperature-dependence of the mechanical properties of FRP orthodontic wire"Dental Materials J.. 18. 167-175 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Uga, M. et al.: "Bracket suitable for esthetic orthodontic wire"J Japanese Society for Dental Material s and Devices. 19. 553-564 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yamagata, S. et al.: "A reinforcement method for retainer polymer using biocompatible glasscloth"J. Hokkaido Orthodontic Society. 29. 11-15 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Suwa N. et al.: "Frictional properties of various orthodontic wires including fiber reinforced plastic esthetic wire and the brackets ebaluated by suspensional type friction testing equipment"J. Japanese Society for Dental Materials and Devices. 24. 372-379 (2001)

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

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Published: 2003-09-17  

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