Journal
JOURNAL OF THE ROYAL SOCIETY INTERFACE
Volume 17, Issue 172, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsif.2020.0613
Keywords
phytoliths; silica grit; wear rate; tooth enamel
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Funding
- Junta de Extremadura, Spain, FEDER/ERDF [IB16139, GR18149]
- Ministry of Science and Innovation, Spain [PID2019-105377RB-I00]
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Comparative laboratory sliding wear tests on extracted human molar teeth in artificial saliva with third-body particulates demonstrate that phytoliths can be as effective as silica grit in the abrasion of enamel. A pin-on-disc wear testing configuration is employed, with an extracted molar cusp as a pin on a hard disc antagonist, under loading conditions representative of normal chewing forces. Concentrations and sizes of phytoliths in the wear test media match those of silica particles. Cusp geometries and ensuing abrasion volumes are measured by digital profilometry. The wear data are considered in relation to a debate by evolutionary biologists concerning the relative capacities of intrinsic mineral bodies within plant tissue and exogenous grit in the atmosphere to act as agents of tooth wear in various animal species.
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