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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 4 — Feb. 1, 2002
  • pp: 768–777

Quantitative dental measurements by use of simultaneous frequency-domain laser infrared photothermal radiometry and luminescence

Lena Nicolaides, Chris Feng, Andreas Mandelis, and Stephen H. Abrams  »View Author Affiliations


Applied Optics, Vol. 41, Issue 4, pp. 768-777 (2002)
http://dx.doi.org/10.1364/AO.41.000768


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Abstract

Modulated (frequency-domain) infrared photothermal radiometry (PTR) is used as a dynamic quantitative dental inspection tool complementary to modulated luminescence (LM) to quantify sound enamel or dentin. A dynamic high-spatial-resolution experimental imaging setup, which can provide simultaneous measurements of laser-induced modulated PTR and LM signals from defects in teeth, has been developed. Following optical absorption of laser photons, the experimental setup can monitor simultaneously and independently the nonradiative (optical-to-thermal) energy conversion by infrared PTR and the radiative deexcitation by LM emission. The relaxation lifetimes (τ1, τ2) and optical absorption, scattering, and spectrally averaged infrared emission coefficients (μα, μs, μ¯IR) of enamel are then determined with realistic three-dimensional LM and photothermal models for turbid media followed by multiparameter fits to the data. A quantitative band of values for healthy enamel with respect to these parameters can be generated so as to provide an explicit criterion for the assessment of healthy enamel and, in a future extension, to facilitate the diagnosis of the onset of demineralization in carious enamel.

© 2002 Optical Society of America

OCIS Codes
(260.3060) Physical optics : Infrared
(260.3800) Physical optics : Luminescence

History
Original Manuscript: November 9, 2001
Revised Manuscript: May 29, 2001
Published: February 1, 2002

Citation
Lena Nicolaides, Chris Feng, Andreas Mandelis, and Stephen H. Abrams, "Quantitative dental measurements by use of simultaneous frequency-domain laser infrared photothermal radiometry and luminescence," Appl. Opt. 41, 768-777 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-4-768

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