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Microhardness and fracture toughness of dental materials by indentation method.

机译:压痕法测定牙科材料的显微硬度和断裂韧性。

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The main objective of this study was to measure the fracture toughness of the human teeth enamel using the microindentation technique and to compare the results calculated from the equations developed for Palmqvist and radial-median cracks. Vickers microhardness measurements of dental ceramic (alumina) and human teeth were performed using indentation fracture method. The fracture toughness of enamel was calculated using different equations reported in the literature. Vickers microhardness of the sintered alumina specimen (98.8% theoretical density) was measured to be 14.92 GPa under 9.8 N indentation load. Three equations based on the radial-median cracks were found to be applicable for the fracture toughness determination of the enamel. Results show that indentation fracture method is adequate to measure microhardness and fracture toughness of dental materials. However the calculation of fracture toughness depended on the nature of the cracks and also on the location of the indentation. Therefore, it is necessary to identify the crack profile and to select the appropriate equation for accurate fracture toughness values.
机译:这项研究的主要目的是使用微压痕技术测量人牙釉质的断裂韧性,并比较从为Palmqvist和径向中性裂纹开发的方程式计算的结果。使用压痕断裂法进行牙科陶瓷​​(氧化铝)和人牙齿的维氏显微硬度测量。使用文献中报道的不同方程式来计算搪瓷的断裂韧性。在9.8N的压痕载荷下测得烧结氧化铝样品的维氏显微硬度(理论密度为98.8%)为14.92GPa。发现三个基于径向中间裂纹的方程式可用于确定瓷釉的断裂韧性。结果表明,压痕断裂法足以测量牙科材料的显微硬度和断裂韧性。但是,断裂韧性的计算取决于裂纹的性质以及压痕的位置。因此,有必要识别裂纹轮廓并选择适当的方程式以获取准确的断裂韧性值。

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