Influence of indenter geometry on the frictional sliding resistance of tooth enamel
| Autor: | Peter W. Lucas, Lidia Arockia Thai, Michael V. Swain, Shaji Michael |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope lcsh:Biotechnology Biomedical Engineering Biophysics 02 engineering and technology lcsh:Biochemistry Biomaterials 03 medical and health sciences 0302 clinical medicine Frictional resistance lcsh:TP248.13-248.65 Indentation lcsh:QD415-436 Indentation scratch tests Composite material Swarf computer.programming_language Mechanical Engineering 030206 dentistry Radius 021001 nanoscience & nanotechnology Surfaces Coatings and Films Rake angle Enamel Scratch Tooth wear Abrasion Deformation (engineering) 0210 nano-technology computer |
| Zdroj: | Biosurface and Biotribology, Vol 3, Iss 4, Pp 224-237 (2017) |
| ISSN: | 2405-4518 |
| Popis: | Indentation force-displacement and sliding scratch resistance measurements have been conducted on orangutan tooth enamel. Tests were made with a corner-cube (CC), Berkovich, as well as spherical (nominally 1 μm and 5 μm radius) indenters. Indentation loads ranged from 100 to 5000 μN and were also made on fused silica to calibrate the indenter tips. The frictional force as a function of sliding distance was measured with the atomic force microscope (AFM) option on the indenter system as well as using a high precision AFM and scanning electron microscope (SEM). The frictional resistance was found to be almost constant with indenter load for the CC and Berkovich indenters; for the CC, it depended upon the orientation of the sliding indenter. For the spherical indenters, the 1 μm showed a sharp increase in frictional resistance with increasing load whereas for the 5 μm tip there was minimal change. Observations of the resultant scratches showed ploughing/cutting with the sharp indenters and a transition from an “ironing” like deformation for all the 5 μm tests and for the low load 1 μm tip with ploughing at the heaviest load. In the case of the sharp tips a “metallic” like discontinuous swarf removal process was evident. It was found that the frictional resistance force scaled with the effective rake angle of the indenter tips. Implications of the current observations for understanding tooth wear are considered. |
| Databáze: | OpenAIRE |
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