The laterally varying ultrasonic velocity in the dentin of human teeth

John, Christoph

doi:10.1016/j.jbiomech.2005.08.004

Cited by 11 publications

(5 citation statements)

References 44 publications

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“…The p-wave velocity in human dentin is then derived from the quotient of ⌬t 2 ͑substitution method͒ and ⌬t 1 ͑reflection method͒ which is used as an increase factor relative to the measured longitudinal velocity in water. 30 Except as explicitly stated for Fig. 4, and parts of …”

Section: E Measurement Principlementioning

confidence: 99%

“…The hypothesis is formulated that this is true for at least one further level of inspection. 30 With respect to all possible levels of inspection, it should be mentioned that the overall applicability of this ͑and probably any͒ type of fitting is very doubtful in biological tissues that show similar degrees of complexity. In order to achieve no greater deviations than the errors described ͑as well as to account for quantitative results that are mathematically stable within an additional offset range of ±1.4 m / s͒, it should be stated here that the precision of the coefficients required to describe all of the individual data by means of the proposed general formula yields two coefficients with the necessity of four to five significant digits.…”

Section: F Padé Shape Functions and Distinct Approximationsmentioning

confidence: 99%

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Lateral distribution of ultrasound velocity in horizontal layers of human teeth

John

2006

The Journal of the Acoustical Society of America

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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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Section: E Measurement Principlementioning

confidence: 99%

Section: F Padé Shape Functions and Distinct Approximationsmentioning

confidence: 99%

Lateral distribution of ultrasound velocity in horizontal layers of human teeth

John

2006

The Journal of the Acoustical Society of America

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“…The conventional ultrasonic technique uses contacted piezoelectric transducers to generate and detect ultrasound waves with coupling. It has been successfully used for evaluating the ultrasonic velocity [8][9][10] and the internal structure of extracted human teeth (such as the thickness of dental enamel and dentin [11][12][13][14][15], the internal crack of a simulated human tooth [16]). The surface acoustic wave (SAW), also known as Rayleigh wave, is suitable for surface crack evaluation due to its high sensitivity to the surface and subsurface cracks.…”

Section: Introductionmentioning

confidence: 99%

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 conventional ultrasonic techniques are mainly used to measure the velocity of the ultrasonic wave [13][14][15] and the internal structure of human teeth, such as the thickness of dental enamel [16][17][18][19][20]. But the tooth is too small to generate and detect SAWs on the surface through contact transducers: size limits spatial resolution, without proper coupling the energy of the acoustic wave is difficult to transfer into the tooth, surface preparation of teeth is sometimes required, etc.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2013

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In this paper, a nondestructive laser ultrasonic technique is used to generate and detect broadband surface acoustic waves (SAWs) on human teeth with different demineralization treatment. A scanning laser line-source technique is used to generate a series of SAW signals for obtaining the dispersion spectrum through a two-dimensional fast Fourier translation method. The experimental dispersion curves of SAWs are studied for evaluating the elastic properties of the sound tooth and carious tooth. The propagation and dispersion of SAWs in human teeth are also been studied using the finite element method. Results from numerical simulation and experiment are compared and discussed, and the elastic properties of teeth with different conditions are evaluated by combining the simulation and experimental results.

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The laterally varying ultrasonic velocity in the dentin of human teeth

Cited by 11 publications

References 44 publications

Lateral distribution of ultrasound velocity in horizontal layers of human teeth

Lateral distribution of ultrasound velocity in horizontal layers of human teeth

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

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

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