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Related Experiment Video

Updated: Jun 21, 2026

Ratiometric Imaging of Extracellular pH in Dental Biofilms
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Short-Wavelength Infrared Imaging of Infected and Affected Dentin.

Morgan Ng1, Yi-Ching Ho2, Spencer Wycoff1

  • 1Department of Preventive and Restorative Dental Sciences, University of California, San Francisco, 707 Parnassus Ave, San Francisco, CA 94143, USA.

Diagnostics (Basel, Switzerland)
|April 13, 2024
PubMed
Summary

Short-wavelength infrared (SWIR) imaging shows promise for detecting dental caries. While SWIR imaging did not significantly reduce reflectivity in stained dentin, it may help monitor lesion spread on tooth surfaces.

Keywords:
SWIR imagingaffected dentincaries detectioninfected dentin

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Area of Science:

  • Dental Research
  • Biophotonics
  • Medical Imaging

Background:

  • Bacterial, blood, and food stains in porous caries lesions complicate diagnosis and treatment.
  • Accurate identification of carious tissue is crucial for effective cavity preparation.
  • Previous studies indicated stain molecules do not absorb light beyond 1200 nm.

Purpose of the Study:

  • To image affected (stained) and infected (demineralized) dentin using short-wavelength infrared (SWIR) imaging.
  • To evaluate the utility of SWIR wavelengths for differentiating sound, affected, and infected dentin.
  • To assess SWIR imaging's potential in diagnosing and monitoring dental caries progression.

Main Methods:

  • Sections of extracted teeth with deep dentinal lesions were prepared.
  • Dentin samples were examined using reflected light (400-1700 nm), fluorescence, optical coherence tomography (OCT), and microcomputed tomography (microCT).
  • Mineral density was measured using microCT to correlate with imaging findings.

Main Results:

  • Significant differences in reflected light intensity (400-850 nm) and fluorescence were found between sound, affected, and infected dentin.
  • SWIR imaging did not reveal significant reductions in reflectivity for affected and infected dentin.
  • Microcomputed tomography confirmed mineral density differences corresponding to lesion stages.

Conclusions:

  • Visible light and fluorescence effectively differentiate between sound, affected, and infected dentin.
  • SWIR imaging, while not reducing reflectivity, shows potential for monitoring the lateral spread of dentinal caries.
  • Further research could integrate SWIR imaging into diagnostic tools for dental caries management.