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Near infrared imaging methods, including optical coherence tomography (OCT), have shown promise in assessing activity of enamel caries lesions. We present initial results in ex-vivo dental samples with a polarization diversity-detection OCT system complete with an integrated dental handpiece. Built around an Axsun Technologies swept source engine, images B-scans 12(x) by 7(z) mm at over 100 fps with 66um transverse and 7um depth resolution. Internal normal dental structure and lesions were imaged and compared with micro-CT. We demonstrate that the Axsun OCT prototype can detect the penetration of occlusal lesions to dentin and measure the penetration of approximal lesions when imaging from the occlusal surface.
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Andrés F. Zuluaga, Vincent Yang, Joey Jabbour, Timothy Ford, Nate Kemp, Daniel Fried, "Real-time visualization of hidden occlusal and approximal lesions with an OCT dental handpiece (Conference Presentation)," Proc. SPIE 10857, Lasers in Dentistry XXV, 108570E (7 March 2019); https://doi.org/10.1117/12.2513442