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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >The 3-dimensional zone of the center of resistance of the mandibular posterior teeth segment
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The 3-dimensional zone of the center of resistance of the mandibular posterior teeth segment

机译：下颌后齿段电阻中心的三维区

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摘要

Introduction: We sought the 3-dimensional (3D) zone of the center of resistance (ZCR) of mandibular posterior teeth groups (group 1: first molar; group 2: both molars; group 3: both molars and second premolar; group 4: both molars and both premolars) with the use of 3D finite element analysis. Methods: 3D finite element models comprised the mandibular posterior teeth, periodontal ligament, and alveolar bone. In the symmetric bilateral model, a 100-g midline force was applied on a median sagittal plane at 0.1-mm intervals to determine the anteroposterior and vertical positions of the ZCR (where the applied force induced translation). The most reliable buccolingual position of the ZCR was then determined in the unilateral model. The combination of the anteroposterior, vertical, and buccolingual positions was defined as the ZCR. Results: The ZCRs of groups 1-4 were, respectively, 0.48, 0.46, 0.50, and 0.53 of the mandibular first molar root length from the alveolar crest level and located slightly distobuccally at anteroposterior ratios of 2:3.0, 2:2.3, 2:2.4, and 2:2.5 to each sectional arch length and at buccolingual ratios of 2:1.5, 2:1.1, 2:1.6, and 2:2.4 to the first molar's buccolingual width. Conclusions: The ZCR can be a useful reference for 3D movement planning of mandibular posterior teeth or segments.
机译：介绍：我们寻求悬崖后齿组抗性中心的三维（3D）区（第1组：第一磨牙;第2组：磨牙;第3组：磨牙和第二珠珠;第4组：双臼齿和两种磨模）使用3D有限元分析。方法：3D有限元模型包括下颌后牙，牙周韧带和肺泡骨。在对称的双侧模型中，将100g中线力以0.1mm间隔的中值矢状施加，以确定ZCR的前后和垂直位置（其中施加的力引起的翻译）。然后在单侧模型中确定ZCR最可靠的ZCR的脉冲位置。前后，垂直和脉冲位置的组合定义为ZCR。结果：分别从肺泡嵴水平分别为0.48,0.46,0.50和0.53的下颌第一磨牙根长度，位于2：3.0,2：2.3,2的前后比（2：2.3,2 ：2.4，和2：2.5到每个截面拱长和2：1.5,2：1.1,2：1.6和2：2.4的Buicoling比率为第一磨牙的Bucolingual宽度。结论：ZCR可以是下颌后齿或段的3D运动规划的有用参考。

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    Oh Moon-Bee; Mo Sung-Seo; Hwang Chung-Ju; Chung Chooryung; Kang Ju-Man; Lee Kee-Joon;

  • 作者单位

    Yonsei Univ Grad Sch Coll Dent Dept Orthodont Seoul South Korea;

    Catholic Univ Korea St Pauls Hosp Coll Med Dept Dent Div Orthodont Seoul South Korea;

    Yonsei Univ Coll Dent Inst Craniofacial Deform Dept Orthodont 50-1 Yonsei Ro Seoul 03722;

    Gangnam Severance Dent Hosp Dept Orthodont Seoul South Korea;

    Catholic Univ Korea Seoul St Marys Hosp Coll Med Dept Dent Div Orthodont Seoul South Korea;

    Yonsei Univ Coll Dent Inst Craniofacial Deform Dept Orthodont 50-1 Yonsei Ro Seoul 03722;

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  • 正文语种 eng
  • 中图分类 口腔科学;
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