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2002 Fiscal Year Final Research Report Summary

Quantitative assessment for effects of premolar extraction upon orthodontic treatment outcomes

Research Project

Project/Area Number 13672148
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 矯正・小児・社会系歯学
Research InstitutionOsaka University

Principal Investigator

YASUDA Yoshitaka  Osaka University, Graduate School of Dentistry, Associate professor, 歯学研究科, 助教授 (90294115)

Co-Investigator(Kenkyū-buntansha) YASHIRO Kohtaro  Osaka University, Graduate School of Dentistry, Assistant professor, 歯学研究科, 助手 (10303976)
TAKADA Kenji  Osaka University, Graduate School of Dentistry, Professor, 歯学研究科, 教授 (50127247)
Project Period (FY) 2001 – 2002
KeywordsEMG / masticatory muscle / orthodontic treatment / extraction
Research Abstract

For eight adult females who underwent edgewise treatment with extraction and eight females who underwent the treatment with extraction of four premolars, their 3D jaw movements during gum chewing have been recorded at pre and post treatment periods. The standardized gum having known physical properties has been used for the test foods. Specifically, the analyses for the effects of orthodontic treatment on the smoothness of the jaw movement have been conducted. The smoothness of the jaw movement trajectories has been estimated by using normalized jerkcost as well as the simulation results by the minimum jerk model. The jaw movement smoothness was compared with thatdeterminedinthefemalesubjectswithacceptable goodocclusion
The present results showed significant postoperative improvement in the jaw movement smoothness in the two patient groups. As for the jaw movement smoothness for the patients treated with premolar extraction, the smoothness at the post treatment periods was not significantly different from that for the normal subjects. It is suggested that the extraction of the premolar that is often necessary for the edgewise treatment may contributes to achievement of the optimal jaw movement smoothness that is apparently seen in the control subjects

  • Research Products

    (18 results)

All Other

All Publications (18 results)

  • [Publications] S.Miyawaki: "Changes in silent periods on EMG of jaw-closing muscles during chewing after surgicalorthodontic treatment of an adult skeletal Class III case"Clinical Orthodontics and Research. 4(2). 119-123 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Yashiro: "A dynamic human jaw model with analogues for multiple occlusal contacts involving dental implants"IA'02 Proceedings of International Symposium for Young Researchers on Modeling and their Applications. 83-90 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Takagi: "Application of a kinematic model for assessing trajectories of human chewing cycle"IA'02 Proceedings of International Symposium for Young Researchers on Modeling and their Applications. 91-98 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Takada: "Jerk-cost as a predictor of malocclusions and their treatment outcomes"Orthodontics in the 21^<st> Century. 51-59 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y.Yasuda: "A case of skeletal class 3 : Long term observation after the active orthodontic treatment"Orthodontics in the 21^<st> Century. 208-211 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K Yashiro: "Application of Fourier series for assessing jaw movement smoothness during speech articulation"In Workshop on DSP in Mobile and Vehicular Systems, Session 2. 73-76 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K Yashiro: "Improvement in smoothness of chewing cycle following treatment of anterior cross bite malocclusion"The journal of cranio mondibular practice. 21(未定). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 保田好隆: "成人の診断基準における抜歯"臨床家のための矯正イヤーブック2001. 126-133 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 保田好隆: "矯正歯科治療における抜歯、非抜歯"The Quintessence YEAR BOOK 2002-今日の治療指針 2002-. 25-29 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S,Miyawaki: "Changes in sileat periods on EMG of jaw-closing muscles during chewing after aurgicalorthodoutic treatment of an adult skeletal Class III case"Clinical Orthodontics and Research. 4(2). 119-123 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K,Yashin: "A dynamic human taw model with i analogues for multiple occlusaJ contacts involvingdental implauta"LA'02 Proceedings of International Symposium for Young Researchers on Modeling and their Applications. 83-90 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M,Takagi: "Application of a kinematic model for assessing trajectories of human chewing cycle"LA'02 Proceedings of International Symposium for Young Researchers on Modeling and their Applications. 91-98 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K,Takada: "Jerk-cost as a predictor of malocclusiona and their treatment outcomes"Orthodontics in the 21^<st> Century. 51-59 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y,Yasuda: "A case of skeletal class 3: Long term observation after the active orthodontic treatment"Orthodontics m the 21^<st> Century. 208-211 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K,Yaahiro: "Application of Fourier series for assessing jaw movement smoothness during speech articulation"In Workshop on DSP in Mobile and Vehicular Systems. Sessin 2. 73-76 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K,Yashiro: "Improvement in smoothness of chewing cycle following treatment of anteriorcross bite maloccluskm"The journal of craaio mondibular practice. 21,In press.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y,Yasuda: "The Quintessence YEAR BOOK 2001"Diagnostic criteria of extraction in adult orthodontic patients. 126-133 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Y,Yasuda: "The Quintessence YEAR BOOK 2002"Diagnostic criteria of extraction in adult orthodontic patients. 25-29 (2002)

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

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Published: 2004-04-14  

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