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1997 Fiscal Year Final Research Report Summary

Basic Investigation of Fe-Pt Magnetic Alloys to Crown and Bridge Prosthodontics.

Research Project

Project/Area Number 07457465
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

KIMURA Kouhei  TOHOKU UNIVERSITY,School of Dentistry. Professor, 歯学部, 教授 (40108551)

Co-Investigator(Kenkyū-buntansha) KETORI Tatsuo  TOHOKU UNIVERSITY,School of Dentistry. Assistant, 歯学部, 助手 (50234646)
KASAHARA Shin  TOHOKU UNIVERSITY,Dental Hospital. Lecturer, 歯学部・付属病院, 講師 (70169407)
YODA Masanobu  TOHOKU UNIVERSITY,School of Dentistry. Assistant Professor, 歯学部, 助教授 (70005073)
NAKAYAMA Takafumi  The Research Institute for Electric and Magnetic Material. Chief research worker, 研究部, 主任研究員 (40164363)
OKUNO Osamu  TOHOKU UNIVERSITY,School of Dentistry. Professor, 歯学部, 教授 (50014080)
Project Period (FY) 1995 – 1997
KeywordsFe-Pt Magnetic Alloy / Dental Casting / Megnetic Properties / Attractive Forces / Remobable Crowns an Bridges
Research Abstract

We have designed and studied new removable crowns and bridges. The crowns and bridges are separately prepared by dental casting with Fe-Pt-Nb magnetic alloys for outer caps and magnetic stainless steel for inner caps, respectively, so that magnetic force reinforce their physical strengh. The purpose of this study was to examine the applicability of Fe-Pt-Nb magnetic alloys to outer caps by dental casting. The first experimentation was to investigate effects of differences in titanium investments and the mold temperature on Fe-Pt-Nb magnetic alloys. The second experimentation was to investigate effects of additive elements such as Si and Nb on Fe-Pt-Nb magnetic alloys. The last experimentation was to investigate effects of magnetizing nethods on attractive forces in Fe-Pt-Nb magnetic alloys. The results were as follows :
1.Measuring surface foughness and magnetic properties, titanium investment (Titavest CB) and the mold Temperature (200-600゚C) were optimum condition for dental casting of Fe-Pt-Nb magnetic alloys.
2.The addition of Si 0.1 (mole%) over improved the surface roughness and decreased the casting defect, and the addition of Si 0.2 (mole%) below and of Nb 0.5 (mole%) over could produce the excellent magnetic properties. Therefore, it was conducted that the optimal composhition was Fe-39.5Pt-0.65Nb-0.1Si (mole%).
3.The attractive force which was observed with crown-type (magnetized along the crown axis, Fe-39.5Pt-0.65Nb-0.1Si (mole%)) showed 536gf on the average. This value is enough to retain removable crowns and brides for dental use.
Further study is needed to elucidate the relationship between the adaptation accuracy and the attractive force as well as mechanical properties of these alloys.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 菅野 太郎: "歯科鋳造による白金鉄系磁石合金のクラウン・ブリッジへの応用" 日本磁性歯科学会雑誌. 5-1. 58-66 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 中山 孝文: "歯科鋳造したFeーPt系磁石合金の磁性特性" 日本応用磁気学会誌. 21. 377-380 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.KANNO: "Application of Dental Casting Fe-Pt Magnet to Crowns and Bridges." Third International Congress on Dental Materials. 287- (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 菅野 太郎: "白金鉄系磁石合金鋳造体に及ぼすSiおよびNbの添加効果" 歯科材料・器械. 17-1. 54-61 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 菅野 太郎: "白金鉄系磁石合金の歯科鋳造による可徹式クラウン・ブリッジへの応用に関する基礎的研究" 日本補綴歯科学会雑誌. 42-2. 掲載予定 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Taro Kanno: "An Application of Fe-Pt-Nb Magnet to Crown and Bridge Prosthodontics" The Journal of the Japanese Society of Magnetic Applications in Dentistry. 5-1. 58-66 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takafumi Nakayama: "Megnetic Properties of Hard Magnetic Fe-Pt Alloys in Dental Catst" The Journal of Magnetics Society of Japan.21-4-2.377-380 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taro Kanno.: "Application of Dental Casting Fe-Pt Magnet to Crowns and Bridges" Third International Congress on Dental Materials.287 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taro Kanno.: "Effect of Si and Nb on Fe-Pt Magnetic Casting Alloys" The Journal of the Japanese Society for Dental Materials and Devices.17-1.54-61 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Taro Kanno: "Basic Investigation of Fe-Pt-Nb Magnetic Alloys to Removable Crown and Bridges by Casting" The Journal of the Japan Proshodontic Society.42-2. (Printing). (1998)

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

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Published: 1999-03-16  

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