Dental biothermophotonics: How photothermal methods are winning the
race with X-rays for dental caries diagnostic needs of clinical dentistry |
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Authors: | A Mandelis R Jeon A Matvienko S H Abrams B T Amaechi |
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Institution: | (1) Center for Advanced Diffusion-Wave Technologies, University of Toronto, 5 King's College Road, Toronto, ON, M5S 3G8, Canada;(2) Four-Cell Consulting, Toronto, Canada;(3) Department of Community Dentistry, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229-3900, USA |
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Abstract: | Recent trends in biothermophotonics of teeth are
presented. The presentation is centered on the development of clinical-level
frequency-domain photothermal radiometry and modulated luminescence to
address issues associated with the early diagnosis of demineralization
caries in human teeth. Biothermophotonic principles and applications to the
detection of the carious state in human teeth as embodied by laser
photothermal radiometry are presented and further supported by modulated
luminescence. The emphasis is on recent developments with regard to
abilities of these techniques to diagnose interproximal lesions between
teeth, etching with phosphoric acid and with an artificial demineralization
gel in order to simulate early demineralization, as well as demineralization
and remineralization of dental crown enamel and root dentin. These are
lesions which normally go undetected by X-ray radiographs. Comparisons with
X rays, Micro-Computed Tomography (μ-CT) and Transverse
Micro-Radiography (TMR) are discussed. A theoretical model involving coupled
diffuse photon density and thermal-wave fields is developed and applied to
frequency scans from demineralized artificial lesions to produce
quantitative values for optical and thermophysical parameters of teeth as
well as the thickness of the induced lesion. |
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