Detection of dental secondary caries using frequency-domain infrared photothermal radiometry (PTR) and modulated luminescence (LUM)

J. Kim, A. Mandelis, A. Matvienko, S. Abrams, B. T. Amaechi

Research output: Contribution to journalArticle

5 Scopus citations


The ability of frequency-domain photothermal radiometry (PTR) and modulated luminescence (LUM) to detect secondary caries is presented. Signal behavior upon sequential demineralization and remineralization of a spot (diameter ~1 mm) on a vertical wall of sectioned tooth samples was investigated experimentally. From these studies, it was found that PTR-LUM signals change, showing a certain pattern upon progressive demineralization and remineralization. PTR amplitudes slightly decreased upon progressive demineralization and slightly increased upon subsequent remineralization. The PTR phase increased during both demineralization and remineralization. LUM amplitudes exhibit a decreasing trend at excitation/probe distances larger than 200 μm away from the edge for both demineralization and remineralization; however, at locations close to the edge (up to ~200 μm), LUM signals slightly decrease upon demineralization and slightly increase during subsequent remineralization.

Original languageEnglish (US)
Pages (from-to)1778-1786
Number of pages9
JournalInternational Journal of Thermophysics
Issue number10-11
Publication statusPublished - Oct 8 2012



  • Caries
  • Demineralization
  • Luminescence
  • Photothermal radiometry
  • Remineralization
  • Secondary caries
  • Wall lesions

ASJC Scopus subject areas

  • Condensed Matter Physics

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