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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 18 — Aug. 31, 2009
  • pp: 15592–15607

Laser ultrasonic surface wave dispersion technique for non-destructive evaluation of human dental enamel

Hsiao-Chuan Wang, Simon Fleming, Yung-Chun Lee, Sue Law, Michael Swain, and Jing Xue  »View Author Affiliations


Optics Express, Vol. 17, Issue 18, pp. 15592-15607 (2009)
http://dx.doi.org/10.1364/OE.17.015592


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Abstract

This paper describes a novel optical system for clinical diagnosis of dental enamel based on its elasticity. Current examination techniques are typically destructive, and frequently impractical for in-vivo inspection. This paper describes the first application of a laser ultrasonic non-destructive evaluation (NDE) method for clinical dental diagnosis. It performs remote elasticity evaluation on small dimension samples. A focused laser line-source generates broadband surface acoustic wave (SAW) impulses which are detected with a simplified optical fibre interferometer. The measured SAW velocity dispersion spectrum was in turn used to characterise the elasticity of the specimen. Different metal structures were measured to verify the system performance. The results agree well with theoretical values and confirm the reliability and accuracy of the laser NDE system. This technique was then applied to evaluate the surface of sound natural human dental enamel. The measured dispersion spectra match theoretical expectations and the influences of both the enamel and the underlying dentin on the surface wave propagation were observed. This is the first time, to the best of our knowledge, that a laser based SAW velocity dispersion technique has been successfully applied on human dental enamel. As a remote, non-destructive technique it is applicable in-vivo and opens the way for early diagnosis of dental caries.

© 2009 OSA

OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.3890) Instrumentation, measurement, and metrology : Medical optics instrumentation
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(240.6690) Optics at surfaces : Surface waves
(280.3375) Remote sensing and sensors : Laser induced ultrasonics

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: June 9, 2009
Revised Manuscript: July 28, 2009
Manuscript Accepted: July 29, 2009
Published: August 19, 2009

Virtual Issues
Vol. 4, Iss. 10 Virtual Journal for Biomedical Optics

Citation
Hsiao-Chuan Wang, Simon Fleming, Yung-Chun Lee, Sue Law, Michael Swain, and Jing Xue, "Laser ultrasonic surface wave dispersion technique for non-destructive evaluation of human dental enamel," Opt. Express 17, 15592-15607 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-18-15592


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