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Human tooth enamel exhibits excellent wear-resistance in mouth. It consists of 92–96% inorganic substances, 1–2% organic materials, and 3–4% water by weight. The contribution of water content to its wear mechanism has not been fully understood yet. In this paper, nano-indentation and scratch tests were performed on human tooth enamel after different drying time to study the effect of water content...
Given that human tooth enamel contains 92–96wt% inorganic substances, it is often considered as a biological ceramic material. However, recently a few studies have indicated that the unique composition and microstructure of enamel result in its nanomechanical performance similar to that of metal materials. To extend the understanding of enamel wear mechanism, the sliding wear behavior of human tooth...
Lubrication is the primary function of saliva in the mouth, which is closely associated with the adsorbed salivary proteins. Previous studies have suggested that the amount of adsorbed salivary proteins on the surfaces of human teeth depends on adsorption time. The objective of this study is to investigate the effect of adsorption time on the lubricating performance of human whole saliva. In this...
The friction between stump and prosthetic socket can cause friction injuries to the stump skin. Therefore, most amputees usually wear prosthetic socks to protect the stump skin. In this study, in vivo tribological behaviors, mechanical irritations and comfort sensations of stump skin against different prosthetic socks were investigated using a UMT-II tribometer under the simulated prosthetic socket...
Acid-eroded human tooth enamel is more susceptible to abrasion and attrition than intact enamel. Previous studies suggested that remineralization may be a useful way to improve the mechanical properties of acid-eroded enamel. The objective of our study was to investigate the effect of remineralization on the nanomechanical properties and microtribological behaviour of acid-eroded human tooth enamel...
With a nanoscratch tester, the microtribological behaviour of human tooth enamel was investigated by a spherical diamond tip. Before tests, the molars were longitudinally sectioned, well polished and etched in 0.001M citric acid solution for 1min. The experimental results indicated that the scratching behaviour of enamel was closely associated with its microstructure. Due to the “buffer” effect of...
With a worldwide increase in the ingestion of acidic soft drinks, the wear of human teeth in acidic oral environment is becoming normal, especially in young people. Previous studies mostly focused on the friction and wear behaviours of human teeth in the artificial saliva, and wear behaviours in acidic environment are still far from being well understood. In this paper, the wear behaviour of human...
The differences in the friction and wear behaviour of different human tooth structures against titanium have been investigated using a reciprocating apparatus containing an artificial saliva solution. The effects of enamel, enamel rod orientation, and dentin were of particular interest. A normal load of 20N, reciprocating amplitude of 500μm, and frequency of 2Hz were used. Tests lasting up to 5000...
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