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請使用永久網址來引用或連結此文件:
https://irlib.pccu.edu.tw/handle/987654321/32099
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| 題名: | Evolution and Function of Dinosaur Teeth at Ultramicrostructural Level Revealed Using Synchrotron Transmission X-ray Microscopy |
| 作者: | Wang, Chun-Chieh
Song, Yen-Fang
Song, Sheng-Rong
Ji, Qiang
Chiang, Cheng-Cheng
Meng, Qingjin
Li, Haibing
Hsiao, Kiko
Lu, Yi-Chia
Shew, Bor-Yuan
Huang, Timothy
Reisz, Robert R. |
| 貢獻者: | 地質系 |
| 關鍵詞: | TOMES GRANULAR LAYER
TOOTH ENAMEL MICROSTRUCTURE
HADROSAURID DINOSAURS
DENTIN |
| 日期: | 2015-11 |
| 上傳時間: | 2016-02-26 14:50:35 (UTC+8) |
| 摘要: | The relationship between tooth form and dietary preference is a crucial issue in vertebrate evolution. However, the mechanical properties of a tooth are influenced not only by its shape but also by its internal structure. Here, we use synchrotron transmission X-ray microscopy to examine the internal microstructures of multiple dinosaur teeth within a phylogenetic framework. We found that the internal microstructures of saurischian teeth are very different from advanced ornithischian teeth, reflecting differences in dental developmental strategies. The three-tissue composition (enamel-mantle dentin-bulk dentin) near the dentinoenamel junction (DEJ) in saurischian teeth represents the primitive condition of dinosaur teeth. Mantle dentin, greatly reduced or absent from DEJ in derived ornithischian teeth, is a key difference between Saurischia and Ornithischia. This may be related to the derived herbivorous feeding behavior of ornithischians, but interestingly, it is still retained in the herbivorous saurischian sauropods. The protective functions of mantle dentin with porous microstructures between enamel and bulk dentin inside typical saurischian teeth are also discussed using finite-element analysis method. Evolution of the dental modifications in ornithischian dinosaurs, with the absence of mantle dentin, may be related to changes in enamel characteristics with enamel spindles extending through the DEJ. |
| 關聯: | SCIENTIFIC REPORTS 卷: 5 文獻號碼: 15202 |
| 顯示於類別: | [地質系] 期刊論文
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