Comparison between in vivo and theoretical bite performance: Using multi-body modelling to predict muscle and bite forces in a reptile skull
Comparison between in vivo and theoretical bite performance: Using multi-body modelling to predict muscle and bite forces in a reptile skull
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DOI：
10.1016/j.jbiomech.2010.05.037
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发表时间：
2010-10-19
影响因子：
2.4
通讯作者：
Fagan, M. J.
中科院分区：
文献类型：
--
作者：
Curtis, N.;Jones, M. E. H.;Fagan, M. J.
在生物力学研究中，可以使用计算机断层扫描图像容易地创建解剖结构的几何精确的计算机模型。然而，软组织结构的表示更具挑战性，依赖于近似来预测肌肉负荷条件，这在详细的功能分析中是必不可少的。在这里，使用一个复杂的多体计算机模型的爬行动物头骨（rhynchocephalian Sphenodon），我们评估肌肉力量预测的准确性，通过比较预测的咬合力对体内数据。该模型预测的咬合力比实验测量的咬合力低近三倍。峰值肌肉力量估计是高度敏感的纤维长度，肌肉应力，和pennation的角度是大的，这些参数的变化可以产生预测咬合力的实质性差异。蜥蜴之间的理论咬合预测的审查表明，咬合力一直被低估，可能是因为在这些动物的肌肉pennation高水平。为了在楔齿龙、蜥蜴和相关群体的理论分析过程中产生逼真的咬合，我们建议标准的肌肉力量计算应乘以最多三个因子。我们发现，咬合力增加，关节力减少，因为咬合点向后移动的颌骨内，最后咬合位置产生的咬合力几乎是最前咬合的两倍。单侧和双侧咬合产生类似的总咬合力;然而，牙齿施加的压力是在单侧咬合期间的两倍，因为牙齿接触面积减少了一半。皇冠版权所有（C）2010由爱思唯尔有限公司出版。保留所有权利。
In biomechanical investigations, geometrically accurate computer models of anatomical structures can be created readily using computed-tomography scan images. However, representation of soft tissue structures is more challenging, relying on approximations to predict the muscle loading conditions that are essential in detailed functional analyses. Here, using a sophisticated multi-body computer model of a reptile skull (the rhynchocephalian Sphenodon), we assess the accuracy of muscle force predictions by comparing predicted bite forces against in vivo data. The model predicts a bite force almost three times lower than that measured experimentally. Peak muscle force estimates are highly sensitive to fibre length, muscle stress, and pennation where the angle is large, and variation in these parameters can generate substantial differences in predicted bite forces. A review of theoretical bite predictions amongst lizards reveals that bite forces are consistently underestimated, possibly because of high levels of muscle pennation in these animals. To generate realistic bites during theoretical analyses in Sphenodon, lizards, and related groups we suggest that standard muscle force calculations should be multiplied by a factor of up to three. We show that bite forces increase and joint forces decrease as the bite point shifts posteriorly within the jaw, with the most posterior bite location generating a bite force almost double that of the most anterior bite. Unilateral and bilateral bites produced similar total bite forces; however, the pressure exerted by the teeth is double during unilateral biting as the tooth contact area is reduced by half. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.