In vitro near-infrared imaging of occlusal dental caries using a germanium-enhanced CMOS camera

Chulsung Lee; Cynthia L. Darling; Daniel Fried

doi:10.1117/12.849338

5 March 2010 In vitro near-infrared imaging of occlusal dental caries using a germanium-enhanced CMOS camera

Chulsung Lee, Cynthia L. Darling, Daniel Fried

Proceedings Volume 7549, Lasers in Dentistry XVI; 75490K (2010) https://doi.org/10.1117/12.849338
Event: SPIE BiOS, 2010, San Francisco, California, United States

Abstract

The high transparency of dental enamel in the near-infrared (NIR) at 1310-nm can be exploited for imaging dental caries without the use of ionizing radiation. The objective of this study was to determine whether the lesion contrast derived from NIR transillumination can be used to estimate lesion severity. Another aim was to compare the performance of a new Ge enhanced complementary metal-oxide-semiconductor (CMOS) based NIR imaging camera with the InGaAs focal plane array (FPA). Extracted human teeth (n=52) with natural occlusal caries were imaged with both cameras at 1310-nm and the image contrast between sound and carious regions was calculated. After NIR imaging, teeth were sectioned and examined using more established methods, namely polarized light microscopy (PLM) and transverse microradiography (TMR) to calculate lesion severity. Lesions were then classified into 4 categories according to the lesion severity. Lesion contrast increased significantly with lesion severity for both cameras (p<0.05). The Ge enhanced CMOS camera equipped with the larger array and smaller pixels yielded higher contrast values compared with the smaller InGaAs FPA (p<0.01). Results demonstrate that NIR lesion contrast can be used to estimate lesion severity.

Citation Download Citation

Chulsung Lee, Cynthia L. Darling, and Daniel Fried "In vitro near-infrared imaging of occlusal dental caries using a germanium-enhanced CMOS camera", Proc. SPIE 7549, Lasers in Dentistry XVI, 75490K (5 March 2010); https://doi.org/10.1117/12.849338

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