Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/1565
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Type: Journal article
Title: Wear of human enamel: a quantitative in vitro assessment
Author: Kaidonis, J.
Richards, L.
Townsend, G.
Tansley, G.
Citation: Journal of Dental Research, 1998; 77(2):1983-1990
Publisher: AMER ASSOC DENTAL RESEARCH
Issue Date: 1998
ISSN: 0022-0345
1544-0591
Statement of
Responsibility: 
Kaidonis, John Aristidis
Abstract: Many factors influence the extent and rate at which enamel wears. Clinical studies in humans are limited by difficulties in the accurate quantification of intra-oral wear and by a lack of control over the oral environment. The purpose of this study was to determine the wear characteristics of human dental enamel under controlled experimental conditions. An electro-mechanical tooth wear machine, in which opposing enamel surfaces of sectioned, extracted teeth were worn under various conditions, was used to simulate tooth grinding or bruxism. Enamel surface wear was quantified by weight to an accuracy of 0.1 mg, with water uptake and loss controlled. The variables considered included the structure and hardness of enamel, facet area, duration of tooth contact, relative speed of opposing surfaces, temperature, load, pH, and the nature of the lubricant. Enamel wear under non-lubricated conditions increased with increasing load over the range of 1.7 to 16.2 kg. The addition of a liquid lubricant (pH = 7) reduced enamel wear up to 6.7 kg, but when the load increased above this threshold, the rate of wear increased dramatically. With the viscosity of the lubricant constant and pH = 3, the rate of wear was further reduced to less than 10% of the non-lubricated rate at 9.95 kg, after which the rate again increased substantially. Under more extreme conditions (pH = 1.2, simulating gastric acids), the wear was excessive under all experimental loads. When saliva was used as a lubricant, the amount of wear was relatively low at 9.95 kg, but rapid wear occurred at 14.2 kg and above. These results indicate that under non-lubricated conditions, enamel wear remains low at high loads due to the dry-lubricating capabilities of fine enamel powder. Under lubricated conditions, low loads with an acidic lubricant lead to little enamel wear, whereas very low pH results in a high rate of wear under all loads.
Keywords: Bicuspid; Molar, Third; Dental Enamel; Humans; Bruxism; Tooth Abrasion; Analysis of Variance; Reproducibility of Results; Hardness Tests; Hydrogen-Ion Concentration; Surface Properties; Hardness; Lubrication; In Vitro Techniques
RMID: 0030003047
DOI: 10.1177/00220345980770120601
Appears in Collections:Dentistry publications

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