Evaluation of skeletal and dental asymmetries in Angle Class II subdivision malocclusions with cone-beam computed tomography
Evaluation of skeletal and dental asymmetries in Angle Class II subdivision malocclusions with cone-beam computed tomography
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DOI：
10.1016/j.ajodo.2013.02.026
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发表时间：
2013-07-01
影响因子：
3
通讯作者：
Kim, Ki Beom
中科院分区：
文献类型：
--
作者：
Minich, Craig M.;Araujo, Eustaquio A.;Kim, Ki Beom
前言：本研究的目的是确定安氏II类细分错牙合在II类和I类之间是否存在骨骼或牙齿不对称。方法：对54例未经治疗的安氏II类牙周炎患者进行治疗前照片和锥束计算机断层扫描。这些照片被用来识别II类细分错牙合，并记录每个象限的拥挤程度。在每个CBCT体积上绘制标志点，以便进行直接的三维测量，以比较II类侧和I类侧的骨骼和牙齿结构的位置和尺寸。结果：上颌骨相对于颅底的位置和下颌孔至颧孔的大小在两个骨骼测量值上有显著差异。下颌第一磨牙和尖牙相对于上颌和下颌的位置在统计学上有显著差异。上颌第一磨牙和尖牙与下颌的关系在统计学上有显著差异。结论：I类和II类患者的骨骼和牙齿有显著差异。牙齿不对称约占总不对称的三分之二。
Introduction: The purpose of this study was to determine whether Angle Class II subdivision malocclusions have skeletal or dental asymmetries between the Class II and Class I sides. Methods: A sample of 54 untreated Angle Class II subdivision patients with pretreatment photos and cone-beam computed tomography (CBCT) scans was used. The photos were used to identify the Class II subdivision malocclusion and to record the amount of crowding per quadrant. Landmarks were plotted on each CBCT volume so that direct 3-dimensional measurements could be made to compare the positions and dimensions of the skeletal and dental structures on the Class II side vs the Class I side. Results: Significant differences were found for 2 skeletal measurements: the position of the maxilla relative to the cranial base, and the mandibular dimension from the mandibular foramen to the mental foramen. Statistically significant dental differences were found for the position of the mandibular first molars and canines in relation to the maxilla and the mandible. Statistically significant differences were found for the maxillary first molars and canines in relation to the mandible. Conclusions: There were significant skeletal and dental differences between the Class I and Class II sides. The dental asymmetries accounted for about two thirds of the total asymmetry.