Shape-preserving erosion controlled by the graded microarchitecture of shark tooth enameloid.
Shape-preserving erosion controlled by the graded microarchitecture of shark tooth enameloid.
复制标题
DOI：
10.1038/s41467-020-19739-0
复制
发表时间：
2020-11-24
影响因子：
16.6
通讯作者：
Fratzl P
中科院分区：
文献类型：
--
作者：
Amini S;Razi H;Seidel R;Werner D;White WT;Weaver JC;Dean MN;Fratzl P
所有脊椎动物的牙齿主要由相同的材料组成，但它们的寿命差异很大：与哺乳动物形成鲜明对比的是，鲨鱼牙齿的功能只能持续数周，而不是数十年，因此终身耐用性在很大程度上无关紧要。然而，它们的饮食多种多样，而且通常对机械要求很高，因此，即使面对极高且具有潜在破坏性的接触应力，它们的牙齿也应该保持功能性形态。在这里，我们调和了手术牙齿几何形状的需要和吃硬食物所固有的不可避免的损害之间的两难境地，证明杰克逊港鲨鱼（硬壳猎物专家）的牙尖具有不寻常的微结构，可以以保持功能性尖尖形状的方式控制牙齿侵蚀。釉质中的分级结构会引发特定位置的损伤反应，结合外部釉质的碎裂和内部釉质的平滑磨损，以保持有效的形状以抓住坚硬的猎物。我们的发现为多层牙釉质促进鲨鱼生态进化多样化的主导理论提供了实验支持。鲨鱼牙齿的寿命很短，但可能会受到严重的机械损伤。在这里，作者报告了鲨鱼牙齿釉质的特定位点损伤机制，该机制维持了牙齿的功能形状，提供了实验证据，表明牙齿结构可能影响了鲨鱼生态在进化过程中的多样化。
The teeth of all vertebrates predominantly comprise the same materials, but their lifespans vary widely: in stark contrast to mammals, shark teeth are functional only for weeks, rather than decades, making lifelong durability largely irrelevant. However, their diets are diverse and often mechanically demanding, and as such, their teeth should maintain a functional morphology, even in the face of extremely high and potentially damaging contact stresses. Here, we reconcile the dilemma between the need for an operative tooth geometry and the unavoidable damage inherent to feeding on hard foods, demonstrating that the tooth cusps of Port Jackson sharks, hard-shelled prey specialists, possess unusual microarchitecture that controls tooth erosion in a way that maintains functional cusp shape. The graded architecture in the enameloid provokes a location-specific damage response, combining chipping of outer enameloid and smooth wear of inner enameloid to preserve an efficient shape for grasping hard prey. Our discovery provides experimental support for the dominant theory that multi-layered tooth enameloid facilitated evolutionary diversification of shark ecologies. Shark teeth have short lifespans yet can be subject to significant mechanical damage. Here, the authors report on a site-specific damage mechanism in shark teeth enameloid, which maintains tooth functional shape, providing experimental evidence that tooth architecture may have influenced the diversification of shark ecologies over evolution.
登录
查看更多内容
影响因子：
3
作者：
Enax, Joachim;Prymak, Oleg;Epple, Matthias
通讯作者：
Epple, Matthias
DOI：
10.1016/j.jmbbm.2017.08.022
发表时间：
2018-01-01
影响因子：
3.9
作者：
Hoerth, Rebecca M.;Kerschnitzki, Michael;Wagermaier, Wolfgang
通讯作者：
Wagermaier, Wolfgang
影响因子：
9.7
作者：
Chen, Po-Yu;Lin, Albert Yu-Min;Meyers, Marc Andre
通讯作者：
Meyers, Marc Andre
DOI：
10.1007/bf00337122
发表时间：
1967-01-01
期刊：
ZEITSCHRIFT FUR ZELLFORSCHUNG UND MIKROSKOPISCHE ANATOMIE
影响因子：
--
作者：
BOYDE, A;LESTER, KS
通讯作者：
LESTER, KS
影响因子：
2.2
作者：
Arnold, W. H.;Gaengler, P.
通讯作者：
Gaengler, P.