Experimental and numerical studies for nondestructive evaluation of human enamel using laser ultrasonic technique

Sun, Kaihua; Yuan, Lei; Shen, Zhonghua; Zhu, Qingping; Lü, Jian; Ni, Xiaowu

doi:10.1364/ao.52.006896

Cited by 5 publications

(4 citation statements)

References 36 publications

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“…The thermodynamics parameters of human enamel and dentin can be seen in the literature [30]. The upper surface of the model is regarded as a free boundary.…”

Section: B Fem Methodsmentioning

confidence: 99%

“…The experimental results were compared and discussed to evaluate the depth of cracks in two teeth. A finite element method (FEM) [27][28][29][30] was used for simulating SAW's propagation in human teeth with different crack depths. The relationships between the depths of cracks and the properties of the ultrasonic waves propagating in the two teeth were studied.…”

Section: Introductionmentioning

confidence: 99%

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Scanning laser-line source technique for nondestructive evaluation of cracks in human teeth

et al. 2014

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This paper describes the first application of a remote nondestructive laser ultrasonic (LU) system for clinical diagnosis of cracks in human teeth, to our knowledge. It performs non-contact cracks detection on small-dimension teeth samples. Two extracted teeth with different types of cracks (cracked tooth and craze lines), which have different crack depths, are used as experimental samples. A series of ultrasonic waves were generated by a scanning laser-line source technique and detected with a laser-Doppler vibrometer on the two samples. The B-scan images and peak-to-peak amplitude variation curves of surface acoustic waves were obtained for evaluating the cracks' position and depth. The simulation results calculated by finite element method were combined with the experimental results for accurately measuring the depth of crack. The results demonstrate that this LU system has been successfully applied on crack evaluation of human teeth. And as a remote, nondestructive technique, it has great potential for early in vivo diagnosis of cracked tooth and even the future clinical dental tests.

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“…The thermodynamics parameters of human enamel and dentin can be seen in the literature [30]. The upper surface of the model is regarded as a free boundary.…”

Section: B Fem Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Scanning laser-line source technique for nondestructive evaluation of cracks in human teeth

et al. 2014

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“…[39] Later implementations in tooth tissues in various healthy and pathological states used resonant ultrasonic spectroscopy, [38] acoustic microscopy, [7,8,9] surface waves [10] or laser ultrasonics. [11], [12] However, these techniques are limited to the MHz range, i.e. a ∼ 100 µm resolution, unable to reveal the micromechanics of the tooth, in particular at tissue interfaces.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical imaging of dentin with Brillouin microscopy

et al. 2020

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The physical structure of teeth can be altered by diet, age or diseases such as caries or sclerosis. It is of utmost importance to characterize the mechanical properties to predict and understand tooth decay, to design restorative dental procedure, and to investigate the tribological behavior of teeth. Yet, existing imaging techniques are unable to reveal the micromechanics of the tooth, in particular at tissue interfaces. Here we developed a microscope based on Brillouin light scattering (BLS) to probe mechanical changes in tooth tissues. BLS is an inelastic process that uses the scattering of light by acoustic waves in the GHz range. Our microscope thus reveals the mechanical properties at a submicrometer scale without contact to the sample. BLS signals show significant differences between healthy tissues and pathological lesions, and allow delineating precisely destructed dentin. We also show maps of the sagittal and transversal planes of healthy tubular dentin that reveal its anisotropic microstructure with a 1 µm resolution, several orders of magnitude below previous reports. Our observations indicate that the collagen-based matrix of dentine is the main load bearing structure, which can be thought of as a fiber-reinforced composite. In the vicinity of polymeric tooth-filling materials, we observed fingering of the adhesive complex into the opened tubules of healthy dentine. The ability to probe the quality of this interfacial layer could lead to innovative designs of biomaterials used for dental restorations in contemporary adhesive dentistry, and would have direct repercussions on the decision-making during clinical work.

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“…First, the FEM was applied to simulate laserinduced wedge waves. Then, pulsed laser excitation and optical vibrometer detection [24,25] were employed to record wedge waves, and the dispersions of wedge waves were obtained by using the 2D Fourier transformation method [26]. The correctness of the system was subsequently validated by comparing the obtained experimental data with theoretically calculated FEM data.…”

Section: Introductionmentioning

confidence: 99%

Study of the impact of truncations on wedge waves by using the laser ultrasound technique

2015

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This research focuses on measuring the impact of truncations on the dispersion characteristics of wedge waves propagating along the wedge tip by using the laser-generated ultrasound. First, the finite element method was used to simulate laser-induced wedge waves and the dispersion curves were obtained by using the 2D Fourier transformation method. Pulsed laser excitation and laser-based wedge wave detection were also utilized to investigate these characteristics experimentally. For the 20° and 60° line wedges, both experimental and numerical results indicated that a nonideal wedge tip had great impact on the wedge waves. The modes of the 20° line wedge with truncations presented anomalous dispersion, low mode closed to high mode in high frequency, and the characteristics of antisymmetric Lamb waves as truncation increased. Meanwhile, the modes of the 60° line wedge with truncations showed the characteristics of antisymmetric Lamb waves, and the A₁ mode was also observed clearly. The findings of this study can be used to evaluate and detect wedge structure.

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Experimental and numerical studies for nondestructive evaluation of human enamel using laser ultrasonic technique

Cited by 5 publications

References 36 publications

Scanning laser-line source technique for nondestructive evaluation of cracks in human teeth

Scanning laser-line source technique for nondestructive evaluation of cracks in human teeth

Micromechanical imaging of dentin with Brillouin microscopy

Study of the impact of truncations on wedge waves by using the laser ultrasound technique

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