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将经过颏孔与下颌体下缘间中点,而且平行于基底平面的弧线,称作“下颌骨外侧下弧线”,它与颌面外科下颌骨模具固定关系密切。通过铝条塑形,在坐标纸上描画该曲线,记点和曲线直线化处理,对新疆乌鲁木齐及陕南出土的159例汉族成人下颌骨的研究结果表明,该曲线大致为抛物线。用线性回归法计算所拟定的经验公式 y=kx~2中系数 K,并对其进行了显著性 t 检验和等差级数法分级。结果,性别差异不明显,侧差和地区差别显著。当置信系数α=0.001时,左右侧 K 值均可分成11级。这不但为下颌骨固定模具的生产和选用提供了参数,也为人类学研究提供了一种有用的手段。下颌骨粉碎性骨折或部分截除等,均需要固定模具。模具的生产及型号选用,与下颌骨的形态参数有关。根据临床要求,模具固定时,多数放在下颌骨外侧面下部或下缘。因此,固定模具的曲度,与下颌骨外侧面下部平行于其基底平面的曲线参数关系最为密切,它对固定模具的生产与选用,甚至人工下颌骨应用均有意义,若按下颌骨体外侧面不同高度,平行于基底平面画三条距离大致相等的弧线,并称过双颏孔的弧线为“下颌骨外侧中弧线”,则过颏孔与上下缘连线中点的弧线,分别称为“下颌骨外侧上弧线”和“下颌骨外侧下弧线”。“下颌骨外侧下弧线”就是那种重要的曲线。这里将专门探讨一下国人该曲线、的基本特征及其关键参数的统计学分类。
Will go through the midpoint between the mental foramina and the lower edge of the mandibular body, and parallel to the plane of the base of the arc, known as the “mandibular lateral lower arc”, which jaw and maxillofacial surgery mandibular mold fixed closely. The results of the study on 159 mandibles from Han nationality unearthed in Urumqi, Xinjiang and Shaanxi Province show that the curve is roughly parabolic. Linear regression method was used to calculate the empirical formula y = kx ~ 2 in the coefficient K, and its significant t-test and classification of equal-difference series. As a result, gender differences were insignificant with significant differences between regions and regions. When the confidence coefficient α = 0.001, left and right K values can be divided into 11 levels. This not only provides the parameters for the production and selection of mandible fixed mold, but also provides a useful means for anthropological research. Mandibular comminuted fracture or partial removal, etc., need to be fixed mold. Mold production and model selection, and the morphological parameters of the mandible. According to clinical requirements, the mold is fixed, most of the lower part of the mandibular lateral or lower edge. Therefore, the curvature of the fixed mold, the lower part of the mandibular lateral parallel to the base plane of the curve parameters closest to the most, it is fixed mold production and selection, and even the application of artificial mandible are meaningful, if you press the mandibular lateral body surface Different height, parallel to the basement plane draw three arcs roughly equal distance, and said the double mental foramina arc as “the outer mandibular arc”, then over the mental foramen and the upper and lower edge of the midpoint of the arc, Respectively, called “the outer mandibular curve” and “mandibular lateral lower curve.” “Under the mandibular lateral arc” is the kind of important curve. Here we will look specifically at the curve of the Chinese people, the basic characteristics and statistical classification of key parameters.