Optical Coherence Tomography for Imaging Dental Caries
Optical Coherence tomography (OCT) is a noninvasive technique that can be used to measure reflectivity within dental hard tissues. Due to the strong reflection at the tooth surfaces, the contrast between sound and demineralized tissues can be enhanced by use of polarization. Polarized sensitive OCT (PS-OCT) can monitor demineralization and remineralization. Clinical studies have indicated that OCT was able to demonstrated penetration into DEJ more reliably that radiographs in questionable occlusal caries. In root caries, the system was able to discriminate sound dentin from demineralized dentin, assess cementum thickness and determine lesion severity by using shrinkage of dentin as a surrogate for demineralization. The system has also proven beneficial for assessment of caries underneath restorations and sealants.
KeywordsOptical coherence tomography Polarization sensitivity Caries diagnosis Lesion activity
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