Lateral distribution of ultrasound velocity in horizontal layers of human teeth.
Lateral distribution of ultrasound velocity in horizontal layers of human teeth.
复制标题
人体牙齿水平层中超声速度的横向分布。
DOI：
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发表时间：
2006
影响因子：
2.4
通讯作者：
C. John
中科院分区：
文献类型：
--
作者：
C. John
20 MHz的超声波在人体牙齿内的速度不同，这取决于所涉及的组织。四个牙齿组织中至少有两个表现出纵向速度（CL）的变化。本体外研究的目的是描述切向传播的纵波的横向变化的传播速度。在距牙冠参考5 mm处，使用纵切面和脉冲回波技术确定CL。结合几个图来说明CL的冠顶降低和沿沿着水平相邻的相对齿宽部分的横向变化的CL分布。21个试样在径向位置的横向增加CL从2900上升到4000 m/s。数学评估揭示了形式CL（5 mm）= a + bX 2ln（X）的最佳水平公式，其中X是相对于单个齿宽w的标准化横向参数，其针对偏移进行补偿。提供了相应近似值的个体残差和a、B系数。个体平均误差范围为7 m/s（SD=6 m/s）至92 m/s（SD=79 m/s）。所有CL分布的包络曲线的下轮廓通过采用先前引入的方程来描述[J. Acoust. Soc. Am. 116，545（2004）]。
The speed of ultrasound at 20 MHz differs inside human teeth depending on which tissues are involved. At least two out of four dental tissues exhibit variations in the longitudinal velocity (CL). The aim of this in vitro study is to describe the laterally varying propagation velocity of tangentially propagating longitudinal waves. At a distance of 5 mm from the crown reference, the CL is determined using longitudinal sections and a pulse-echo technique. Several graphs are combined to account for the corono-apical decrease in CL and the laterally varying CL distribution along horizontally adjacent relative tooth width portions. The laterally increasing CL of 21 specimens at radial locations rises from 2900 to 4000 m/s. A mathematical evaluation reveals an optimal horizontal formula of the form CL(5 mm) = a + bX2 ln(X), where X is the standardized lateral parameter relative to individual tooth width w, which is compensated for offsets. Individual residuals and a, b coefficients of the corresponding approximations are provided. Individual mean errors range from 7 m/s (SD=6 m/s) to 92 m/s (SD=79 m/s). The lower contour of the envelope curve of all CL distributions is described by taking up a formerly introduced equation [J. Acoust. Soc. Am. 116, 545 (2004)].
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影响因子：
2.4
作者：
Kinney, JH;Gladden, JR;Maynard, JD
通讯作者：
Maynard, JD
影响因子：
3
作者：
Kinney, JH;Balooch, M;Marshall, SJ
通讯作者：
Marshall, SJ
影响因子：
5
作者：
Watanabe, LG;Marshall, GW;Marshall, SJ
通讯作者：
Marshall, SJ
影响因子：
4.6
作者：
PASHLEY, DH
通讯作者：
PASHLEY, DH