Effect of Indentation Load and Time on Knoop and Vickers Microhardness Tests for Enamel and Dentin

被引:88
作者
Chuenarrom, Chanya [1 ]
Benjakul, Pojjanut [1 ]
Daosodsai, Paitoon [1 ]
机构
[1] Prince Songkla Univ, Dept Prosthet Dent, Fac Dent, Hat Yai, Thailand
来源
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS | 2009年 / 12卷 / 04期
关键词
dentin; enamel; Knoop hardness; Vickers hardness; BLEACHING AGENTS; HARDNESS; ACID;
D O I
10.1590/S1516-14392009000400016
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The aim of this study was to determine the effect of variations in indentation load and time on the Knoop and Vickers hardness numbers (KHN and VHN) for enamel and dentin. Twenty molar teeth were divided into twenty enamel and twenty dentin specimens. Each specimen was tested using a Knoop or Vickers microhardness tester at different loads and times. The difference in hardness between the groups was analyzed with two-way ANOVA followed by a Tukey test. The results revealed that a difference of indentation time did not influence the microhardness number of enamel and dentin. The KHN values of enamel and the VHN values of dentin were affected by variation of test loads. Therefore, the tooth hardness number for different loads may not be acceptable for comparison.
引用
收藏
页码:473 / 476
页数:4
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