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Proceedings Paper

Experimental investigation of demineralization and remineralization of human teeth using infrared photothermal radiometry and modulated luminescence
Author(s): Raymond J. Jeon; Adam Hellen; Anna Matvienko; Andreas Mandelis; Stephen H. Abrams; Bennett T. Amaechi
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Paper Abstract

Photothermal radiometry (PTR) and modulated luminescence (LUM) were applied to detect and monitor the demineralization of root and enamel surfaces of human teeth to produce caries lesions and the subsequent remineralization of the produced lesions. The experimental set-up consisted of a semiconductor laser (659 nm, 120 mW), a mercury-cadmium-telluride IR detector for PTR, a photodiode for LUM, and two lock-in amplifiers. A lesion was created on a 1-mm × 4-mm rectangular window, spanning root to enamel surface, using an artificial caries lesion gel to demineralize the tooth surface and create small carious lesions. The samples were subsequently immersed in a remineralization solution. Each sample was examined with PTR/LUM on root and enamel before and after treatment at times from 1 to 10 days of demineralization and 2 to 10 days of remineralization. PTR/LUM signals showed gradual and consistent changes with treatment time. At the completion of the experiments, transverse micro-radiography (TMR) analysis was performed to correlate the PTR/LUM signals to depth of the carious lesions and mineral losses. In this study, TMR showed good correlation with PTR/LUM. It was also found that treatment duration did not correlate well to any technique, PTR/LUM, or TMR, which is indicative of significant variations in demineralization - remineralization rates among different teeth.

Paper Details

Date Published: 28 February 2008
PDF: 10 pages
Proc. SPIE 6856, Photons Plus Ultrasound: Imaging and Sensing 2008: The Ninth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics, 68560B (28 February 2008); doi: 10.1117/12.763807
Show Author Affiliations
Raymond J. Jeon, Univ. of Toronto (Canada)
Quantum Dental Technologies (Canada)
Adam Hellen, Univ. of Toronto (Canada)
Quantum Dental Technologies (Canada)
Anna Matvienko, Univ. of Toronto (Canada)
Quantum Dental Technologies (Canada)
Andreas Mandelis, Univ. of Toronto (Canada)
Quantum Dental Technologies (Canada)
Stephen H. Abrams, Quantum Dental Technologies (Canada)
Bennett T. Amaechi, Univ. of Texas Health Science Ctr. at San Antonio (United States)


Published in SPIE Proceedings Vol. 6856:
Photons Plus Ultrasound: Imaging and Sensing 2008: The Ninth Conference on Biomedical Thermoacoustics, Optoacoustics, and Acousto-optics
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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