Share Email Print
cover

Proceedings Paper

Quantitative analysis of incipient mineral loss in hard tissues
Author(s): Anna Matvienko; Andreas Mandelis; Adam Hellen; Raymond Jeon; Stephen Abrams; Bennett Amaechi
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A coupled diffuse-photon-density-wave and thermal-wave theoretical model was developed to describe the biothermophotonic phenomena in multi-layered hard tissue structures. Photothermal Radiometry was applied as a safe, non-destructive, and highly sensitive tool for the detection of early tooth enamel demineralization to test the theory. Extracted human tooth was treated sequentially with an artificial demineralization gel to simulate controlled mineral loss in the enamel. The experimental setup included a semiconductor laser (659 nm, 120 mW) as the source of the photothermal signal. Modulated laser light generated infrared blackbody radiation from teeth upon absorption and nonradiative energy conversion. The infrared flux emitted by the treated region of the tooth surface and sub-surface was monitored with an infrared detector, both before and after treatment. Frequency scans with a laser beam size of 3 mm were performed in order to guarantee one-dimensionality of the photothermal field. TMR images showed clear differences between sound and demineralized enamel, however this technique is destructive. Dental radiographs did not indicate any changes. The photothermal signal showed clear change even after 1 min of gel treatment. As a result of the fittings, thermal and optical properties of sound and demineralized enamel were obtained, which allowed for quantitative differentiation of healthy and non-healthy regions. In conclusion, the developed model was shown to be a promising tool for non-invasive quantitative analysis of early demineralization of hard tissues.

Paper Details

Date Published: 18 February 2009
PDF: 12 pages
Proc. SPIE 7166, Optics in Bone Biology and Diagnostics, 71660C (18 February 2009); doi: 10.1117/12.810086
Show Author Affiliations
Anna Matvienko, Univ. of Toronto (Canada)
Quantum Dental Technologies (Canada)
Andreas Mandelis, Univ. of Toronto (Canada)
Quantum Dental Technologies (Canada)
Adam Hellen, Univ. of Toronto (Canada)
Quantum Dental Technologies (Canada)
Raymond Jeon, Univ. of Toronto (Canada)
Quantum Dental Technologies (Canada)
Stephen Abrams, Quantum Dental Technologies (Canada)
Bennett Amaechi, Univ. of Texas Health Science Ctr. at San Antonio (United States)


Published in SPIE Proceedings Vol. 7166:
Optics in Bone Biology and Diagnostics
Andreas Mandelis, Editor(s)

© SPIE. Terms of Use
Back to Top