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High contrast reflectance imaging at 1950 nm for the assessment of lesion activity on extracted teeth

Authors
  • Tressel, John
  • Abdelaziz, Marwa
  • Fried, Daniel
Type
Published Article
Journal
Proceedings of SPIE--the International Society for Optical Engineering
Publication Date
Mar 05, 2021
Volume
11627
Identifiers
DOI: 10.1117/12.2584909
PMID: 33762796
PMCID: PMC7986894
Source
PubMed Central
Keywords
Disciplines
  • Article
License
Unknown

Abstract

Changes in the reflectivity of lesions on the proximal surfaces of extracted human teeth were measured at SWIR wavelengths from 1300–2000 nm as they were dried with air to assess lesion activity. An extended range tungsten-halogen lamp with bandpass filters of varying wavelength (bandwidth) 1300 nm (90), 1460 nm (85), 1535 nm (80), and 1675 nm (90) along with a broadband ASE source centered near the peak of the water-absorption band at 1950-nm were used as light sources and an extended range InGaAs camera (1000–2340 nm) was used to acquire reflected light images as the samples were dried with air. MicroCT images were used as a gold standard for comparison. SWIR light at 1950 nm yields extremely high contrast of demineralization and appears to be the optimum wavelength for the assessment of lesion activity on tooth coronal surfaces.

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