Clinical survey of the association between root resorption incident to orthodontic treatment and host factors

  • MATSUDA,Yayoi
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • MOTOKAWA,Masahide
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • KAKU,Masato
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • KAWATA,Toshitsugu
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • YAMAMOTO,Ryoko
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • TSUKA,Natsumi
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • INUBUSHI,Toshihiro
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • SASAMOTO,Tomoko
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • OZAKI,Noritsugu
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • KOSEKI,Hiroyuki
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • KAWAZOE,Aki
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • ABEDINI,Sara
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences
  • TANNE,Kazuo
    Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences

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Other Title
  • 矯正歯科治療に伴う歯根吸収と宿主要因との関連性に関する臨床調査

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Introduction: The purpose of this study was to clarify the prevalence and degree of root resorption induced by force application during orthodontic treatment. Association between the root resorption and host factors was statistically examined. Materials and Methods: In this study, 243 subjects (72 male and 171 female subjects) were randomly selected from patients treated with multibracket appliances at the Orthodontic Department of Hiroshima University Hospital. The severity of root resorption was classified into five groups according to an index score from 0 to 4 defined by Malmgren et al., using pre-treatment and post-treatment dental radiographs. Results: Root resorption was found in 78% patients, and prominent, in particular, in the upper and lower incisors and canines. The prevalence of severe root resorption was significantly higher in the teeth with short roots than in those with normal roots. The prevalence was also significantly higher in male than in female patients, and in patients with maxillary protrusion and age >20 years when active treatment was started. Moreover, teeth with trauma tended to exhibit a higher prevalence of root resorption than those without. Conclusions: Maxillomandibular incisors, teeth with short roots, male sex, maxillary protrusion, and age >20 years are risk factors for severe root resorption.

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