Sun Kaihua, Yuan Ling, Shen Zhonghua, Zhu Qingping
Appl Opt. 2018 Feb 10;57(5):1231-1240. doi: 10.1364/AO.57.001231.
This study aims to evaluate early caries in human teeth with different geometry structures by using the dispersion curves of a surface acoustic wave (SAW) generated by a pulsed laser. Through the finite element method, SAWs propagating on teeth models with different enamel thickness and curvature radius were simulated, and the influence of the geometry difference on the dispersion curves of SAWs was discussed. Laser ultrasonic experiments were performed on an extracted human incisor and molar with different demineralization conditions. The received dispersive surface wave signals were processed via the spectral analysis method to obtain the dispersion curves, and the difference of the dispersion spectra between the incisor and the molar was analyzed and discussed. The result demonstrates that the laser generating the SAW has the ability to evaluate the elastic properties of early caries with different geometry nondestructively.
本研究旨在通过使用脉冲激光产生的表面声波（SAW）的色散曲线来评估具有不同几何结构的人类牙齿中的早期龋齿。通过有限元方法，模拟了在具有不同牙釉质厚度和曲率半径的牙齿模型上传播的SAW，并讨论了几何差异对SAW色散曲线的影响。对具有不同脱矿条件的一颗拔除的人类门牙和磨牙进行了激光超声实验。通过频谱分析方法对接收到的色散表面波信号进行处理以获得色散曲线，并分析和讨论了门牙和磨牙之间的色散谱差异。结果表明，产生SAW的激光能够无损地评估具有不同几何形状的早期龋齿的弹性特性。
