Resonant ultrasound spectroscopy measurements of the elastic constants of human dentin
Resonant ultrasound spectroscopy measurements of the elastic constants of human dentin
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DOI：
10.1016/j.jbiomech.2003.09.028
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发表时间：
2004-04-01
影响因子：
2.4
通讯作者：
Maynard, JD
中科院分区：
文献类型：
--
作者：
Kinney, JH;Gladden, JR;Maynard, JD
采用共振超声光谱（RUS）技术测量水合人牙本质的二阶弹性常数。将样本放置在两个换能器之间，测量 0.5 至 1.4 MHz 之间的振动共振频率。根据测量的水合牙本质共振频率确定的弹性常数表现出轻微的六角各向异性，最硬的方向垂直于小管的轴线（E-11 = 25.1 GPa）。这种六方各向异性很小（E-33/E-11 = 0.92），并且当样品干燥时几乎消失。另外，湿牙本质的泊松比存在明显的各向异性：nu(21)=0.45； nu(31) = 0.29。在空气中干燥后，这种各向异性消失：nu(21) = nu(31) = 0.29。干燥牙本质的各向同性杨氏模量为28.1GPa。 RUS 有望确定矿化组织的弹性常数。 (C) 2003 Elsevier Ltd. 保留所有权利。
The technique of resonant ultrasound spectroscopy (RUS) was used to measure the second-order elastic constants of hydrated human dentin. Specimens were placed between two transducers, and the resonant frequencies of vibration were measured between 0.5 and 1.4 MHz. The elastic constants determined from the measured resonant frequencies in hydrated dentin exhibited slight hexagonal anisotropy, with the stiffest direction being perpendicular to the axis of the tubules (E-11 = 25.1 GPa). This hexagonal anisotropy was small (E-33/E-11 = 0.92), and almost disappeared when the specimens were dried. In addition, there was a pronounced anisotropy in the Poisson's ratio of wet dentin: nu(21) = 0.45; nu(31) = 0.29. With drying in air, this anisotropy vanished: nu(21) = nu(31) = 0.29. The isotropic Young's modulus of dried dentin was 28.1 GPa. RUS shows promise for determining the elastic constants in mineralized tissues. (C) 2003 Elsevier Ltd. All rights reserved.