Biomechanics of the rostrum and the role of facial sutures
Biomechanics of the rostrum and the role of facial sutures
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DOI：
10.1002/jmor.10104
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发表时间：
2003-07-01
影响因子：
1.5
通讯作者：
Marshall, CD
中科院分区：
文献类型：
--
作者：
Rafferty, KL;Herring, SW;Marshall, CD
喙是一个大直径的薄壁管状结构，它接受来自牙齿的载荷。喙可以被概念化为一个刚性结构，也可以被认为是在缝合处连接的几块骨头的集合。使用小型猪，我们测量了在体内的喙骨和缝线的应变，以更好地了解如何喙的生物力学行为。前上颌骨和鼻骨的应变较低，但相邻的上颌骨-前上颌骨、鼻间和颌间缝的应变较大一个数量级。虽然这一发现强调了喙的复合性质，但我们也在上颌骨和鼻骨中发现了刚性结构行为的证据。也就是说，上颌应变是一致的短梁模型下的剪切变形从磨牙负荷。在鼻骨应变只是部分支持一个长梁模型，而是一个复杂的模式，从切牙接触和侧向压缩的喙背弯曲的建议。由于猪的双侧咬合和类似的工作和平衡侧应变，上颌骨的扭转被排除在外，尽管它在单侧咬合的哺乳动物中可能很重要。扭转载荷在前颌骨中确实显得很重要，这表明工作和平衡侧应变方向的变化。这些差异归因于动力冲程结束时发生的不对称切牙接触。(C)2003 Wiley-Liss，Inc.
The rostrum is a large diameter, thin-walled tubular structure that receives loads from the teeth. The rostrum can be conceptualized both as a rigid structure and as an assemblage of several bones that interface at sutures. Using miniature pigs, we measured in vivo strains in rostral bones and sutures to gain a better understanding of how the rostrum behaves biomechanically. Strains in the premaxillary and nasal bones were low but the adjacent maxillary-premaxillary, internasal, and intermaxillary suture strains were larger by an order of magnitude. While this finding emphasizes the composite nature of the rostrum, we also found evidence in the maxillary and nasal bones for rigid structural behavior. Namely, maxillary strain is consistent with a short beam model under shear deformation from molar loading. Strain in the nasal bones is only partially supported by a long beam model; rather, a complex pattern of dorsal bending of the rostrum from incisor contact and lateral compression is suggested. Torsion of the maxilla is ruled out due to the bilateral occlusion of pigs and the similar working and balancing side strains, although it may be important in mammals with a unilateral bite. Torsional loading does appear important in the premaxillae, which demonstrate working and balancing side changes in strain orientation. These differences are attributed to asymmetrical incisor contact occurring at the end of the power stroke. (C) 2003 Wiley-Liss, Inc.