Quantitative Evaluation of Caries and Calculus with Ultrahigh-Resolution Optical Coherence Tomography

Area of Science:

• Biomedical Imaging
• Dental Science
• Optical Engineering

Background:

• Dental caries and calculus are significant oral health concerns.
• Early detection of dental caries and calculus remains challenging with current imaging technologies.
• Optical Coherence Tomography (OCT) shows promise for dental diagnostics.

Purpose of the Study:

• To develop and evaluate an ultrahigh-resolution OCT (UHR-OCT) system for early-stage dental caries and calculus detection.
• To compare the diagnostic capabilities of UHR-OCT with conventional spectral-domain OCT (SD-OCT).
• To establish quantitative methods for assessing caries and calculus using OCT data.

Main Methods:

• An ultrahigh-resolution OCT (UHR-OCT) system with 2.6 μm axial and 1.8 μm transverse resolution was developed.
• The same teeth were scanned using a conventional spectral-domain OCT (SD-OCT) system (7 μm axial resolution).
• Quantitative analysis included estimating surface roughness and enamel scattering coefficients for caries, and calculus thickness.

Main Results:

• UHR-OCT successfully visualized early-stage dental caries, including small cavities, which were difficult to identify with SD-OCT.
• Quantitative parameters like surface roughness and scattering coefficient effectively differentiated caries stages.
• UHR-OCT enabled accurate estimation of calculus thickness.

Conclusions:

• UHR-OCT significantly improves the detection of early-stage dental caries and calculus compared to conventional OCT.
• The proposed quantitative evaluation methods show potential for improved diagnosis and management of dental conditions.
• UHR-OCT represents a promising advancement in dental imaging for early disease detection.