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Laboratory Studies of Nonlinear Optical Signals for Caries Detection.

E Terrer1, I V Panayotov2, A Slimani2

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Multiphoton microscopy and nonlinear spectroscopy reveal changes in tooth dentin during caries. The ratio of second harmonic generation (SHG) to 2-photon excited fluorescence (2PEF) signals reliably tracks caries progression and organic matrix degradation.

Keywords:
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Area of Science:

  • Biomedical Optics
  • Dental Research
  • Materials Science

Background:

  • Dentin, a calcified tooth tissue, contains type I collagen fibers.
  • Tooth caries involves demineralization and collagen denaturation.
  • Multiphoton microscopy offers deep tissue penetration and reduced photodamage compared to conventional methods.

Purpose of the Study:

  • To investigate the dentin caries process using multiphoton confocal microscopy and nonlinear spectroscopy.
  • To assess the utility of 2-photon excited fluorescence (2PEF) and second harmonic generation (SHG) signals in monitoring caries.
  • To establish the SHG/2PEF ratio as a reliable parameter for caries diagnosis and assessing organic matrix degradation.

Main Methods:

  • Utilized multiphoton confocal microscopy for imaging dentin.
  • Employed nonlinear spectroscopy to measure 2-photon excited fluorescence (2PEF) and second harmonic generation (SHG) signals.
  • Analyzed the ratio of SHG to 2PEF signals in human dentin samples affected by caries.

Main Results:

  • Both 2PEF and SHG intensities in human dentin are significantly altered during the caries process.
  • The ratio between SHG and 2PEF signals demonstrates a strong correlation with the progression of dental caries.
  • The SHG/2PEF ratio provides valuable insights into the degradation of dentin's organic matrix.

Conclusions:

  • Multiphoton imaging and nonlinear spectroscopy are effective tools for studying the dentin caries process.
  • The SHG/2PEF signal ratio is a robust indicator for monitoring caries and evaluating organic matrix integrity.
  • This nonlinear optical approach holds promise for clinical applications in dental caries diagnosis.