Key Laboratory of Ministry of Education for Biomechanics and Mechanobiology, School of Biological Science and Medical Engineering, Beihang University, Beijing, China.
Biomed Res Int. 2017;2017:7852971. doi: 10.1155/2017/7852971. Epub 2017 Apr 30.
This paper proposed to take advantages of resonant ultrasound spectroscopy (RUS) to measure the mechanical properties of human dentin specimen. The resonant spectroscopy of the dentin specimen was obtained between the frequency bands 155 and 575 kHz, and resonant frequencies were extracted by linear predictive filter and then by Levenberg-Marquardt method. By inverse problem approach, 13 experimental resonant frequencies progressively matched to the first 30 orders of theoretical resonant frequencies calculated by Lagrangian variational method. The full second-order elastic tensor of dentin specimen was adjusted. The whole set of human dentin engineering moduli, including Young's moduli ( = 22.641 GPa, = 13.637 GPa), shear moduli ( = 10.608 GPa, = 7.742 Gpa), and Poisson's ratios ( = 0.067, = 0.378), were finally calculated. This study demonstrates that RUS can be successfully adapted to measure the mechanical properties of low quality factor biomaterials.
本文提出利用共振超声光谱（RUS）来测量人牙本质样本的力学性能。在 155 至 575 kHz 的频带范围内获得牙本质样本的共振光谱，并通过线性预测滤波器和 Levenberg-Marquardt 方法提取共振频率。通过逆问题方法，将 13 个实验共振频率逐步与通过 Lagrangian 变分法计算的理论共振频率的前 30 阶相匹配。调整牙本质样本的完整二阶弹性张量。最终计算出整个人牙本质工程模量，包括杨氏模量（ = 22.641 GPa， = 13.637 GPa）、剪切模量（ = 10.608 GPa， = 7.742 Gpa）和泊松比（ = 0.067， = 0.378）。本研究表明，RUS 可成功应用于测量低品质因子生物材料的力学性能。
