Asymmetry of the face in orthodontic patients
Asymmetry of the face in orthodontic patients
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DOI：
10.2319/022107-85.1
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发表时间：
2008-05-01
影响因子：
3.4
通讯作者：
Takada, Kenji
中科院分区：
文献类型：
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作者：
Haraguchi, Seiji;Iguchi, Yoshitaka;Takada, Kenji
目的：调查偏侧的正常不对称的人的脸，检查偏侧的性别，生长阶段，和骨骼classification.Materials和方法的差异：共1800名日本受试者（651名男性和1149名女性，平均年龄，15岁3个月，范围，4岁2个月至59岁11个月）被选中。样本中的个体根据性别、三个生长阶段之一和三种骨骼模式之一进行分类。在正面面部照片上测量从耳杆插入点到面部中线的距离和从软组织门顿到面部中线的垂直距离之间的长度差异。超过3个标准差的测量误差的差异被归类为具有左侧或右侧laterality.Results：面部不对称的受试者，79.7%有更广泛的右半脸，和79.3%的下巴偏差的左侧偏侧。这些倾向是独立的性别，年龄，或骨骼颌骨关系。在这方面，在青春期生长期间，右半侧脸较宽的受试者比例下降（P < .0001），而左半侧脸较宽的比例增加，（P < .01），尽管右侧优势的趋势一致。这些结果表明，在正常的面部不对称性中，侧化现象在人类中一直存在，很可能是遗传的而不是后天获得的。
Objective: To investigate the laterality of the normal asymmetry of the human face, examining differences in laterality in relation to sex, growth stage, and skeletal classification.Materials and Methods: A total of 1800 Japanese subjects (651 males and 1149 females; mean age, 15 years 3 months; range, 4 years 2 months to 59 years 11 months) were selected. Individuals in the sample were categorized according to sex, one of three growth stages, and one of three skeletal patterns. Differences in length between distances from the points at which ear rods were inserted to the facial midline and the perpendicular distance from the soft-tissue menton to the facial midline were measured on a frontal facial photograph. Subjects with a discrepancy of more than 3 standard deviations of the measurement error were categorized as having left- or right-sided laterality.Results: Of subjects with facial asymmetry, 79.7% had a wider right hemiface, and 79.3% of those with chin deviation had left-sided laterality. These tendencies were independent of sex, age, or skeletal jaw relationships. In this regard, during pubertal growth, the proportion of subjects with wider right hemiface decreased (P < .0001), whereas the proportion of those with a wider left hemiface increased (P < .01), despite a consistent tendency for right-sided dominance.Conclusion: These results suggest that laterality in the normal asymmetry of the face, which is consistently found in humans, is likely to be a hereditary rather than an acquired trait.