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

MATSUDA,Yayoi, MOTOKAWA,Masahide, KAKU,Masato, KAWATA,Toshitsugu, YAMAMOTO,Ryoko, TSUKA,Natsumi, INUBUSHI,Toshihiro, SASAMOTO,Tomoko, OZAKI,Noritsugu, KOSEKI,Hiroyuki, KAWAZOE,Aki, ABEDINI,Sara, TANNE,Kazuo

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.

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

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