Hayashi Kazuo, Muguruma Takeshi, Hamaya Meiri, Mizoguchi Itaru
Department of Orthodontics, School of Dentistry, Health Sciences University of Hokkaido, Ishikari-Tobetsu, Hokkaido, Japan.
Angle Orthod. 2004 Feb;74(1):26-30. doi: 10.1043/0003-3219(2004)074<0026:MCOTDA>2.0.CO;2.
The purpose of this study was to clarify the three-dimensional morphological characteristics of the dentition and palate in skeletal asymmetry in patients with skeletal Class III malocclusion using a newly defined palatal reference plane in a dental cast. Twenty patients (5 males and 15 females) who had skeletal Class III malocclusion with facial asymmetry were selected. Pretreatment posteroanterior cephalometric radiographs and maxillary dental casts were used. The lateral deviation of Me was measured as the distance from a line perpendicular to Lo-Lo' that passed through CG. The angle between the Lo-Lo' plane and the J-J' plane was measured. Each maxillary dental cast was measured using a three-dimensional surface-scanning system, and the newly defined palatal reference plane was calculated. The right/left difference in the radius of curvature of the palate and right/left differences in the vertical and mesiodistal positions of the first molars were analyzed. Linear correlation and regression techniques were used. Our findings demonstrate that the lateral deviation of the mandible is closely related to the morphology of the alveolar process and to the vertical height of the dentition. In this study, the three-dimensional application of a new palatal reference plane is very useful in morphological research, and the results provide detailed information on the characteristics of facial asymmetry.
本研究的目的是利用牙模中一个新定义的腭参考平面，阐明Ⅲ类骨性错牙合患者骨骼不对称时牙列和腭部的三维形态特征。选取20例患有Ⅲ类骨性错牙合且面部不对称的患者（5例男性和15例女性）。使用治疗前的正位头影测量X线片和上颌牙模。测量Me点的侧向偏差，即从垂直于Lo-Lo'且经过CG的线的距离。测量Lo-Lo'平面与J-J'平面之间的夹角。使用三维表面扫描系统对上颌牙模进行测量，并计算新定义的腭参考平面。分析腭部曲率半径的左右差异以及第一磨牙垂直和近远中位置的左右差异。采用线性相关和回归技术。我们的研究结果表明，下颌骨的侧向偏差与牙槽突形态和牙列垂直高度密切相关。在本研究中，新腭参考平面的三维应用在形态学研究中非常有用，其结果提供了有关面部不对称特征的详细信息。
