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Proceedings Paper

Near infrared imaging of teeth at wavelengths between 1200 and 1600 nm
Author(s): Soojeong Chung; Daniel Fried; Michal Staninec; Cynthia L. Darling
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Paper Abstract

Near-IR (NIR) imaging is a new technology that is currently being investigated for the detection and assessment of dental caries without the use of ionizing radiation. Several papers have been published on the use of transillumination and reflectance NIR imaging to detect early caries in enamel. The purpose of this study was to investigate alternative near infrared wavelengths besides 1300-nm in the range from 1200- 1600-nm to determine the wavelengths that yield the highest contrast in both transmission and reflectance imaging modes. Artificial lesions were created on thirty tooth sections of varying thickness for transillumination imaging. NIR images at wavelengths from the visible to 1600-nm were also acquired for fifty-four whole teeth with occlusal lesions using a tungsten halogen lamp with several spectral filters and a Ge-enhanced CMOS image sensor. Cavity preparations were also cut into whole teeth and Z250 composite was used as a restorative material to determine the contrast between composite and enamel at NIR wavelengths. Slightly longer NIR wavelengths are likely to have better performance for the transillumination of occlusal caries lesions while 1300-nm appears best for the transillumination of proximal surfaces. Significantly higher performance was attained at wavelengths that have higher water absorption, namely 1460-nm and wavelengths greater than 1500-nm and these wavelength regions are likely to be more effective for reflectance imaging. Wavelengths with higher water absorption also provided higher contrast of composite restorations.

Paper Details

Date Published: 21 February 2011
PDF: 6 pages
Proc. SPIE 7884, Lasers in Dentistry XVII, 78840X (21 February 2011); doi: 10.1117/12.878894
Show Author Affiliations
Soojeong Chung, Univ. of California, San Francisco (United States)
Daniel Fried, Univ. of California, San Francisco (United States)
Michal Staninec, Univ. of California, San Francisco (United States)
Cynthia L. Darling, Univ. of California, San Francisco (United States)


Published in SPIE Proceedings Vol. 7884:
Lasers in Dentistry XVII
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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