RELATIONSHIPS BETWEEN THE SIZE, POSITION, AND ANGULATION OF HUMAN JAW MUSCLES AND UNILATERAL 1ST MOLAR BITE FORCE
RELATIONSHIPS BETWEEN THE SIZE, POSITION, AND ANGULATION OF HUMAN JAW MUSCLES AND UNILATERAL 1ST MOLAR BITE FORCE
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DOI：
10.1177/00220345890680031401
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发表时间：
1989-03-01
影响因子：
7.6
通讯作者：
WOOD, WW
中科院分区：
文献类型：
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作者：
SASAKI, K;HANNAM, AG;WOOD, WW
人类受试者通常显示在第一臼齿处产生的钻头力的大的变化。为了评估肌肉横截面尺寸和杠杆臂在钻头力产生中的作用，我们在11名健康成年人中将这些变量进行了相关分析。通过磁共振获得的轴位和冠状位图像与常规头颅侧位片和牙模型数据相结合，以重建每个受试者的颅下颌形态。右咬肌和翼内肌的横截面尺寸，其杠杆臂，和咬点杠杆臂直接从这些重建测量。咬合力的生理记录是通过一个定制的传感器垂直于功能性咬合平面的方式在右第一磨牙区域进行的。整个样品的平均钻头力为189 ± 0.5。北纬78度的变异系数是更大的钻头力，和两个肌肉的横截面尺寸，比各自的杠杆臂。在咬肌和翼内肌的横截面尺寸之间，以及在每块肌肉的横截面尺寸和咬合力之间，发现了高度显著的Pearson积矩相关系数（p < 0.005）。在肌肉或钻头尖端杠杆臂与钻头力之间没有发现显著相关性（p > 0.1）。尽管事实上，颅面的空间形态可能会有所不同的科目，颌骨肌肉的大小单独似乎解释了我们和其他人报道的咬合力的变化。
Human subjects commonly show large variations in bit force produced at the first molar teeth. To evaluate the role of muscle cross-sectional sizes and lever arms in bit-force production, we correlated these variables in 11 healthy adults. Axial and coronal images obtained by magnetic resonance were combined with conventional lateral cephalograms and dental cast data to reconstruct the craniomandibular morphology in each subject. The cross-sectional sizes of the right masseter and medial pterygoid muscles, their lever arms, and the bite-point lever arms were measured directly from these reconstructions. Physiological recordings of bite force were made in the region of the right first molar by means of a customized transducer aligned perpendicular to the functional occlusal plane. The average bit force for the sample as a whole was 189 .+-. 78 N. The coefficients of variance were greater for bit forces, and for the cross-sectional sizes of the two muscles, than for their respective lever arms. Highly significant Pearson Product Moment correlation coefficients (p < 0.005) were found between masseter and medial pterygoid cross-sectional size, and between the cross-sectional size of each muscle and bit force. No significant correlations (p > 0.1) were found between muscle or bit-point lever arms and bit force. Despite the fact that craniofacial spatial morphology may differ among subjects, jaw muscle size alone seems to explain most of the variation in bite force reported by ourselves and others.