Bitewing radiography is still considered state-of-the-art diagnostic technology for assessing cavitation within
approximal carious dental lesions, even though radiographs cannot resolve cavitated surfaces but instead are
used to measure lesion depth in order to predict cavitation. Clinicians need new technologies capable of
determining whether approximal carious lesions have become cavitated because not all lesions progress to
cavitation. Assessing lesion cavitation from near-infrared (NIR) imaging methods holds great potential due to
the high transparency of enamel in the NIR region from λ=1300-1700-nm, which allows direct visualization
and quantified measurements of enamel demineralization. The objective of this study was to measure the
change in lesion appearance between non-cavitated and cavitated lesions in artificially generated lesions
using NIR imaging modalities (two-dimensional) at λ=1300-nm and λ=1450-nm and cross-polarization
optical coherence tomography (CP-OCT) (thee-dimensional) λ=1300-nm. Extracted human posterior teeth
with sound proximal surfaces were chosen for this study and imaged before and after artificial lesions were
made. A high speed dental hand piece was used to create artificial cavitated proximal lesions in sound
samples and imaged. The cavitated artificial lesions were then filled with hydroxyapatite powder to simulate
non-cavitated proximal lesions.
Jacob C. Simon, Cynthia L. Darling, and Daniel Fried, "Assessment of cavitation in artificial approximal dental lesions with near-IR imaging," Proc. SPIE 10044, Lasers in Dentistry XXIII, 1004407 (Presented at SPIE BiOS: January 29, 2017; Published: 8 February 2017); https://doi.org/10.1117/12.2256701.
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