In vitro detection and quantification of enamel and root caries using infrared photothermal radiometry and modulated luminescence

Raymond J. Jeon, Adam Hellen, Anna Matvienko, Andreas Mandelis, Stephen H. Abrams, Bennett T. Amaechi

Research output: Contribution to journalArticle

23 Scopus citations


Artificially created demineralized and remineralized carious lesions on the root and enamel of human teeth were examined by photothermal radiometry (PTR) and modulated luminescence (LUM). Fourteen extracted human teeth were used and a lesion was created on a 1mm×4mm rectangular window, spanning root to enamel, using a lactic acid-based acidified gel to demineralize the tooth surface. The lesion was then exposed to a remineralization solution. Each sample was examined with PTR/LUM on the root and enamel before and after treatment at times from 1 to 10 (5 on root) days of demineralization and 2 to 10 days of remineralization. Ten-day (5 on root) demineralized samples were remineralized. After completing all the experiments, transverse microradiography (TMR) analysis was performed to compare and correlate the PTR/LUM signals to the depth of lesions and mineral losses. The PTR and LUM amplitudes and phases showed gradual and consistent changes with treatment time. In this study, TMR showed good correlation coefficients with PTR and LUM. It was also found that the length of the treatment time did not correlate very well to any technique, PTR/LUM or TMR, which implies a significant degree of inhomogeneity of the demireralization and remineralization rates in each and every tooth.

Original languageEnglish (US)
Article number034025
JournalJournal of Biomedical Optics
Issue number3
Publication statusPublished - Dec 1 2008



  • demineralization and remineralization
  • dental photothermal radiometry
  • modulated luminescence
  • root caries
  • thermal-wave interferometry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Biomedical Engineering

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