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. 2012 Feb 9:8208.
doi: 10.1117/12.914633.

Remineralization of Root Caries Monitored Using Cross-Polarization Optical Coherence Tomography

Cynthia L Darling  1 , Michal Staninec  1 , Kenneth H Chan  1 , Hobin Kang  1 , Daniel Fried  1
Affiliations

Remineralization of Root Caries Monitored Using Cross-Polarization Optical Coherence Tomography

Cynthia L Darling et al. Proc SPIE Int Soc Opt Eng. .

Abstract

Previous studies have demonstrated that polarization sensitive optical coherence tomography (PS-OCT) can be used to image caries lesions in dentin, measure nondestructively the severity of dentin demineralization, and determine the efficacy of intervention with anticaries agents including fluoride and lasers. However, those studies were limited to artificial lesions on dentin and roots surfaces. The objective of this study is to determine if a cross polarization OCT system (CP-OCT) can be used to nondestructively measure a reduction in the reflectivity of natural root caries lesions after exposure to a remineralization solution. CP-OCT images of 11 teeth with existing root lesions were acquired before and after exposure to a remineralizing solution for 20 days. The integrated reflectivity was calculated after integrating to a fixed depth of 200-µm. There was a significant decrease in the integrated reflectivity after exposure to the remineralizing solution.

Keywords: dental hard tissue; dentin; optical coherence tomography; polarization; remineralization; root caries.

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Figures

Fig. 1
Fig. 1
Visible reflectance image of one of the lesions used in this study.
Fig. 2
Fig. 2
Tomographic CP-OCT scans of one of the root caries lesions before and after exposure to the remineralization solution. C-scans of the surface of the lesion area before (A) and after (B) exposure to the remineralization solution. B-scans taken in the vertical (V) and horizontal (H) positions of the yellow lines shown in the respective c-scan images. A red-white-blue color table was used for the decibel intensity scale, red is high reflectivity and blue is low reflectivity.
Fig. 3
Fig. 3
Tomographic CP-OCT scans of one of the root caries lesions before and after exposure to the remineralization solution. C-scans of the surface of the lesion area before (A) and after (B) exposure to the remineralization solution. B-scans taken in the vertical (V) and horizontal (H) positions of the yellow lines shown in the respective c-scan images.
Fig. 4
Fig. 4
Surface rendered tomographic CP-OCT scans of one of the root caries lesions shown before and after exposure to the remineralization solution at different viewing angles.
Fig. 5
Fig. 5
The mean integrated reflectivity before and after demineralization for the eleven lesions.
See this image and copyright information in PMC

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