为探究牙釉质结构与力学性能及动物食性的关系，收集了中国四省区9种哺乳动物的581颗牙齿。

    采用自行设计的大范围微米级测量实验和扫描电镜实验研究了牙釉质的结构和形貌，用统计学方法分析和对比了测量得到的牙釉柱长度分布，施雷格明带和暗带的分布，牙釉柱晶体纳米纤维直径等实验结果，结果表明牙釉质结构和动物的食性及生态环境密切相关，新发现了哺乳动物牙釉柱与釉牙本质界夹角的分布规律，提出釉质的异型结构是使动物咀嚼时牙齿应力分布最合理的优化结构的猜想。进而利用硬度实验和基于测量结果的有限元分析实验研究了釉质结构和功能的关系，实验结果证实了我的猜想。研究结果可应用于仿生材料，哺乳动物分类学和行为生态学的研究。

    以下是英文版：

    Relationships among mammalian enamel   structures， enamel mechanical properties and feeding habits Animal   Science

 Zhao Jiankui， Jilin Provincial Experimental school，   Grade 12

 While many studies on human teeth have been carried   out， the studies on other

mammalian teeth are limited. The purpose of this   project is to explore the relationships

among enamel structures， enamel mechanical   properties， and feeding habits of mammals. A total

of 581 mammalian teeth of nine species from four   regions of China were collected. With the

help of a CCD installed to a stereoscopic   microscope， I recorded the videos of the whole

surfaces of sliced teeth and an ocular micrometer by   computer. Then， the real value of enamel

prism lengths， enamel prism angles relative to   enamel-dental junction （EDJ）， and Hunter-

Schreger band widths were able to be measured easily   and repeatedly from the video

screenshots by Photoshop. Furthermore， enamel   microstructure and morphology were studied by

scanning electron microscope. Result comparisons   showed that enamel structures are closely

related to mammalian feeding habits and environment.   For example， the different ranges of

enamel prism distribution angle relative to EDJ were   discovered. To explore the correlations

between structure and function， enamel Vickers   hardness tests and the stress analyses in

finite element models， which were designed based on   the measurement results， were carried

out. Result statistical analyses not only show how   enamel structures are closely related to

mammalian feeding habits， but also confirm my   previous hypothesis that enamel should have

optimized structure， which significantly regulates   its stress distributions to better match

mammalian mastication manner. These results will   contribute to the research of bionic

materials， mammalian taxonomy as well as the   behavioral ecology of mammals.

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