J. Phys. IV France
Volume 125, June 2005
Page(s) 741 - 744

J. Phys. IV France 125 (2005) 741-744

DOI: 10.1051/jp4:2005125170

Dental depth profilometric diagnosis of pit & fissure caries using frequency-domain infrared photothermal radiometry and modulated laser luminescence

R.J. Jeon1, A. Mandelis1, V. Sanchez1 and S.H. Abrams2

1  Center for Advanced Diffusion-Wave Technologies (CADIFT), Dept. of Mechanical and Industrial Engineering, Univ. of Toronto, 5 King's College Road, Toronto, Ontario, M5S 3G8, Canada
2  Four Cell Consulting, 748 Briar Hill Ave., Toronto, Ontario, M6B 1L3, Canada

Non-intrusive, non-contacting frequency-domain photothermal radiometry (FD-PTR or PTR) and frequency-domain luminescence (FD-LUM or LUM) have been used with 659- nm and 830-nm laser sources to detect artificial and natural sub-surface defects in human teeth. Fifty-two human teeth were examined with simultaneous measurements of PTR and LUM and compared to conventional diagnostic methods including continuous (dc) luminescence (DIAGNOdent), visual inspection and radiographs by calculating sensitivities and specificities. With the combined criteria of four PTR and LUM signals (two amplitudes and two phases), it was found that the sensitivity of this method was much higher than any of the other methods used in this study, whereas the specificity was comparable to that of dc luminescence diagnostics. Therefore, PTR and LUM, used together as a combined technique, have the potential to be a reliable tool to diagnose early pit and fissure caries and could provide detailed information about deep lesions with its depth profilometric character. Also, from experiments with natural or artificial defects, some depth profilometric characteristics were confirmed.

© EDP Sciences 2005