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The effects of dehiscence and fenestration before orthodontic treatment on external apical root resorption in maxillary incisors

  • Chang Cha
    Affiliations
    Department of Orthodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang, Liaoning, China
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  • Desheng Huang
    Affiliations
    Department of Epidemiology, School of Public Health, China Medical University, Shenyang, Liaoning, China
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  • Qichao Kang
    Affiliations
    Department of Orthodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang, Liaoning, China
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  • Manman Yin
    Affiliations
    Department of Orthodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang, Liaoning, China
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  • Xiulin Yan
    Correspondence
    Address correspondence to: Xiulin Yan, Department of Orthodontics, School and Hospital of Stomatology, China Medical University, No. 117, Nanjing N St, Heping District, Shenyang, Liaoning, China 110002.
    Affiliations
    Department of Orthodontics, School and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang, Liaoning, China
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Published:September 01, 2021DOI:https://doi.org/10.1016/j.ajodo.2020.06.043

      Highlights

      • Dehiscence before treatment is associated with external apical root resorption (EARR).
      • Tooth position, extraction, initial age, and duration also correlated with EARR.
      • Fenestration and sex had no significant association with EARR.
      • Other factors such as density or hardness might be involved.

      Introduction

      The objective of this study was to investigate the effects of dehiscence and fenestration on external apical root resorption (EARR) in maxillary incisors.

      Methods

      Seventy-eight patients were selected for this study. We set dehiscence, fenestration, sex, extraction, or nonextraction, tooth position, initial age, and duration of treatment as independent variables and EARR as the dependent variable. General statistical descriptions for these variables were made by mean, standard deviation and occurrence rates, etc. To make the data visualization and find more information, 2 heat maps were made. Generalized estimation equation analysis was performed to determine associations between EARR and independent variables.

      Results

      The occurrence rates of dehiscence and fenestration in maxillary incisors were 14.77% and 10.74%, respectively. The average value of EARR was 1.09 ± 0.87 mm in this study. Dehiscence, tooth position, extraction, initial age, and duration had significant correlations with EARR. The ratio of exponent B was 1:1.643 for dehiscence and nondehiscence, whereas fenestration and sex had no significant association with EARR.

      Conclusions

      The amount of EARR at maxillary incisors in patients with dehiscence before orthodontic treatment might be less than that in patients without it, and different incisors might have different contributions to it. However, the low value of exponent B for dehiscence meant that there might be other unknown factors that were involved in this study.
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