Masticatory biomechanics of red and grey squirrels (Sciurus vulgaris and Sciurus carolinensis) modelled with multibody dynamics analysis.
Masticatory biomechanics of red and grey squirrels (Sciurus vulgaris and Sciurus carolinensis) modelled with multibody dynamics analysis.
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DOI：
10.1098/rsos.220587
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发表时间：
2023-02
影响因子：
3.5
通讯作者：
Watson, Peter J. J.
中科院分区：
文献类型：
--
作者：
Cox, Philip G. G.;Watson, Peter J. J.
哺乳动物的进食过程是通过相对于颅骨移动下颌骨以使牙齿咬合或脱离咬合来实现的。对于具有高度专业化的颌内收肌结构的啮齿动物来说，这个过程尤其复杂。在这里，我们使用多体动力学分析 (MDA) 计算技术对红松鼠 (Sciurus vulgaris) 和灰松鼠 (Sciurus carolinensis) 的进食进行建模，并确定每个下颌闭合肌肉在产生咬合力中的相对贡献。 MDA 模型模拟不同张开时的门牙咬合。在每次张开嘴时进行一系列“虚拟消融实验”，将每对双侧肌肉的激活设置为零。发现最大咬合力随着间隙的增大而增加。正如预测的那样，浅咬肌和前深咬肌是咬合力的最大贡献者，但颞肌的贡献很小。进一步的分析表明，颞肌在颌骨稳定方面可能比在咬合力的产生方面发挥更重要的作用。这项研究证明了 MDA 能够阐明红松鼠和灰松鼠进食生物力学的细节，为通过体内实验收集的数据提供了补充。
The process of feeding in mammals is achieved by moving the mandible relative to the cranium to bring the teeth into and out of occlusion. This process is especially complex in rodents which have a highly specialized configuration of jaw adductor muscles. Here, we used the computational technique of multi-body dynamics analysis (MDA) to model feeding in the red (Sciurus vulgaris) and grey squirrel (Sciurus carolinensis) and determine the relative contribution of each jaw-closing muscle in the generation of bite forces. The MDA model simulated incisor biting at different gapes. A series of ‘virtual ablation experiments' were performed at each gape, whereby the activation of each bilateral pair of muscles was set to zero. The maximum bite force was found to increase at wider gapes. As predicted, the superficial and anterior deep masseter were the largest contributors to bite force, but the temporalis had only a small contribution. Further analysis indicated that the temporalis may play a more important role in jaw stabilization than in the generation of bite force. This study demonstrated the ability of MDA to elucidate details of red and grey squirrel feeding biomechanics providing a complement to data gathered via in vivo experimentation.
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