Do silica phytoliths really wear mammalian teeth
Do silica phytoliths really wear mammalian teeth
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二氧化硅植硅体真的会磨损哺乳动物的牙齿吗
DOI：
10.1016/j.jas.2006.06.009
复制
发表时间：
2007
影响因子：
2.8
通讯作者：
K. Gross
中科院分区：
文献类型：
--
作者：
G. Sanson;Stuart Kerr;K. Gross
有相当多的文献表明，二氧化硅（蛋白石）植硅体导致哺乳动物牙釉质微磨损。许多文献引用了1959年的一项研究作为证据，证明硅植硅石比哺乳动物牙齿釉质更硬，因此有可能导致牙齿微磨损。没有其他使用类似方法的研究实际上证实了植硅石是否比牙釉质更硬。使用现代纳米压痕工具测试了来自四种草的硅植硅体和来自绵羊的哺乳动物牙釉质的硬度。我们发现硅植硅体比牙釉质（257- 397 HV）软得多（51-211维氏硬度，HV），因此必须重新评估作为牙齿微磨损的主要来源。硬度的结果表明，硅植硅体并不像以前报道的那样对哺乳动物牙齿的微磨损有很大的贡献，外源性砂砾和灰尘是更可能的原因。这一前提的解释微磨损现象的原因代理，如在中新世期间放牧哺乳动物的高冠牙齿的进化，以及推断饮食从哺乳动物牙齿的化石，如体质人类学和考古学的一些研究报告。
There is considerable literature suggesting that silica (opal) phytoliths cause dental enamel microwear in mammals. Much of this literature cites a single study from 1959 as evidence that silica phytoliths are harder than mammalian tooth enamel and so have the potential to cause dental microwear. No other studies using similar methodology have actually confirmed whether phytoliths are harder than dental enamel. The hardness of silica phytoliths from four species of grass and mammalian tooth enamel from sheep was tested using a modern nanoindentation tool. We found that silica phytoliths are considerably softer (51–211 Vickers Hardness, HV) than tooth enamel (257–397HV) and therefore must be re-evaluated as a major source of dental microwear. The hardness results indicate that silica phytoliths do not contribute as much to mammalian dental microwear as previously reported and that exogenous grit and dust are a more likely cause. This premise has implications for interpretations of the causal agents of microwear phenomena in areas such as the evolution of high-crowned teeth in grazing mammals during the Miocene, and the inference of diet from fossilized mammal teeth as reported by some studies in physical anthropology and archaeology.
现代哺乳动物牙齿微磨损和饮食的综述。
DOI：
--
发表时间：
1988
期刊：
Scanning microscopy
影响因子：
--
作者：
Teaford,MF
通讯作者：
Teaford,MF