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Development of orthodontic appliance without pain and the practice

Research Project

Project/Area Number 17592154
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Orthodontic/Pediatric dentistry
Research InstitutionTsurumi University

Principal Investigator

NODA Koji  Tsurumi University, Department of Dentistry, Lecturer (10148059)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Yoshiki  Tsurumi University, Department of Dentistry, Lecturer (10097321)
OIKAWA Takashi  Tsurumi University, Department of Dentistry, Assistant (60386919)
瀬越 健介  鶴見大学, 歯学部, 助手 (90386920)
Project Period (FY) 2005 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,460,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥60,000)
Fiscal Year 2007: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000)
Fiscal Year 2006: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2005: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywordsratchet bracket / orthodontic appliance / interrupted force / optimal force / pain / periodontal ligament / tooth movement
Research Abstract

The ratchet bracket that was designed in this research project has a ratchet mechanism, where interrupted orthodontic force induces by a ratchet mechanism built into the bracket. The operation of the bracket is to push the ratchet rod into the tube, tooth movement of 0.25mm in one the operation, every 4 days. The character of the force induced is moving distance-dependent, and the compressed periodontal ligament (PDL) does not degenerate during tooth movement, because of a slight tooth movement within 0.25mm does not prevent the blood circulation. In this project, the bracket was improved and designed compactly, 3.3×4.6mm in size, as same as the standard size, with thought to be less discomfort.
In the experiment using rat upper molars, the interrupted force that defined as one third of the PDL width was used in 4days interval during tooth movement. No degenerating tissue was seen in the compressed PDL, and pathological root resorption was rarely seen during tooth movement. In addition marked bone formation was seen in the tension side.
In practical use for patients, the following results were obtained : 1) No patient claimed about pain or discomfort during tooth movement by the bracket. 2) The tooth movement occurred smoothly, except the case that the bracket did not function by operation error or the failure of the ratchet spring. 3) Root resorption was not seen in patients, while a slight resorption was seen the apexes of upper incisors in one patient.
From these results, a method of tooth movement by repeating the interrupted force that induced by the moving distance within PDL width preserve PDL tissue without compressive degeneration, and it is suggested that the ratchet bracket is a style of optimal tooth movement with a biological safe.

Report

(4 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • 2005 Annual Research Report
  • Research Products

    (9 results)

All 2007 2006 2005

All Journal Article (7 results) (of which Peer Reviewed: 3 results) Presentation (2 results)

  • [Journal Article] A new idea and method of tooth movement using a ratchet bracket2007

    • Author(s)
      Koji Noda, Yoshiki Nakamura, Kyotaro Kogure, et. al.
    • Journal Title

      European Journal of Orthodontics 29

      Pages: 225-231

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] A new idea and method of tooth movement using a ratchet bracket.2007

    • Author(s)
      Noda K., Nakamura Y., Oikawa T.
    • Journal Title

      Eurpean Journal of Orthodontics 29

      Pages: 225-231

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] A new idea and method of tooth movement using a ratchet bracket2007

    • Author(s)
      Koji Noda, Yoshiki Nakamura, Takashi Oikawa, et. al.
    • Journal Title

      European Jouranl of Orthodontics 29

      Pages: 232-237

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] A new idea and method of tooth movement using a ratchet braclet2007

    • Author(s)
      Koji Noda, Yoshiki Nakamura, Takashi Oikawa, et al.
    • Journal Title

      European Journal of Orthodonties (in proof)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Tooth movement limited to periodontal ligament width using interrupted orthodontic force2006

    • Author(s)
      Koji Noda, Yoshiki Nakamura, Takashi Oikawa, et. al.
    • Journal Title

      Orthodontic Waves 65

      Pages: 73-80

    • NAID

      10018228954

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Tooth movement limited to periodontal ligament width using interrupted orthodontic force.2006

    • Author(s)
      Noda K., Nakamura Y., Oikawa T.
    • Journal Title

      Orthodonitc Waves 65

      Pages: 73-80

    • NAID

      10018228954

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] Tooth movement limited to periodontal ligament width using interrupted orthdontic force2006

    • Author(s)
      Koji Noda, Yoshiki Nakamura, Takashi Oikawa, Ayao Hirashita
    • Journal Title

      Orthodontic Waved Vol. 65・No. 2

      Pages: 73-80

    • Related Report
      2006 Annual Research Report
  • [Presentation] ラチェットブラケットを用いた断続的な矯正力による歯の移動について2005

    • Author(s)
      野田 晃司
    • Organizer
      第64回 日本矯正歯科学会大会
    • Place of Presentation
      パシフィコ横浜
    • Year and Date
      2005-10-13
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Tooth movement by interrupted force using the ratchet bracket2005

    • Author(s)
      Koji Noda
    • Organizer
      64th annual meeting of Japanese Orthodontic Society
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary

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Published: 2005-04-01   Modified: 2016-04-21  

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