Tuxen A, Bakke M, Pinholt E M
Department of Oral and Maxillofacial Surgery, University Hospital, Copenhagen, Denmark.
Arch Oral Biol. 1999 Jun;44(6):509-18. doi: 10.1016/s0003-9969(99)00008-4.
The primary aim was to relate information about masseter muscle fibres and function to aspects of facial morphology in a group of healthy young men. The secondary aim was to investigate possible sex differences using data previously obtained from a comparable group of age-matched, healthy women. Dental status and facial morphology were recorded in 13 male students aged 20-26 years. Functional examinations included bite-force measurements and electromyographic recordings of masseter activity. A biopsy was removed from the masseter of each participant during surgical extraction of a wisdom tooth, and the tissue examined for myosin ATPase activity. Further, the cross-sectional areas of the different fibre types were measured. In spite of using age-matched healthy men and women with a full complement of teeth, statistically significant sex differences were found among measures related to muscle function and some measures of facial morphology. Thus data from men and women should not be pooled uncritically. The greater bite force in men than women corresponded with the greater diameter and cross-sectional area of type II fibres. Further, the males had more anteriorly inclined mandibles and shorter anterior facial height, suggesting a relation between the greater muscle force and the shape of the face. However, linear regression analysis failed to demonstrate any significant association between bite force and facial morphology among men and women. Thus, craniofacial morphology could be a result of far more contributing factors than previously believed.
主要目的是将咬肌纤维和功能的信息与一组健康年轻男性的面部形态特征联系起来。次要目的是利用先前从一组年龄匹配的健康女性中获得的数据，研究可能存在的性别差异。记录了13名年龄在20 - 26岁的男性学生的牙齿状况和面部形态。功能检查包括咬力测量和咬肌活动的肌电图记录。在拔除智齿的手术过程中，从每个参与者的咬肌上取下一块活检组织，检查组织中的肌球蛋白ATP酶活性。此外，还测量了不同纤维类型的横截面积。尽管使用了年龄匹配、牙齿健全的健康男性和女性，但在与肌肉功能相关的测量以及一些面部形态测量中发现了具有统计学意义的性别差异。因此，来自男性和女性的数据不应不加批判地合并。男性比女性更大的咬力与II型纤维更大的直径和横截面积相对应。此外，男性的下颌骨更前倾，前面部高度更短，这表明更大的肌肉力量与面部形状之间存在关联。然而，线性回归分析未能证明男性和女性的咬力与面部形态之间存在任何显著关联。因此，颅面形态可能是由比以前认为的更多的促成因素导致的。
