Knoop and Vickers Diagonal of Microhardness Measurements of Enamel
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Date
2010-08-31
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Journal of the Dental Association of Thailand
Abstract
The objective of this study was to compare the diagonal of hardness measurement of tooth enamel by using Knoop and Vickers microhardness methods. Ten molar teeth were measured for diagonal of hardness using a microhardness tester with Knoop and Vickers indenters under 100, 200 and 300 g test loads. Repeated measurement of the diagonal lengths of all indentations were obtained by using a measuring microscope. The diagonal lengths using a microhardness tester and a measuring microscope were statistically analysed using the paired t-test. Knoop and Vickers diagonal of hardness measurements were 23.9-41.6 μm and 65.6-120.47 μm, respectively. However, the paired t-test of the diagonal of hardness values obtained from using a microhardness tester and a measuring microscope indicated that the Knoop diagonals were statistically different(p \< .05). In contrast, Vickers, diagonal of hardness values showed no statistically different (p \> .05). According to the limitation of this study, the Vickers microhardness test had less errors in measuring diagonal of hardness for enamel than the Knoop test.
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Journal of the Dental Association of Thailand; Vol.59 No.3 July-September 2009; 183-189