Characterization of teeth fluorescence properties due to coffee pigmentation: towards optimization of quantitative light-induced fluorescence for tooth color assessment
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Date
2020
Authors
Nogueira, Marcelo Saito
Bagnato, Vanderlei Salvador
Panhóca, Vitor Hugo
Journal Title
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Publisher
Society of Photo-optical Instrumentation Engineers (SPIE)
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Abstract
The assessment of tooth color is typically performed by subjective comparison with a visual shade guide or by using objective optical techniques such as quantitative light-induced fluorescence (QLF). QLF measurements rely on the precise wavelength calibration of fluorescence excitation and emission for enhancing the contrast between the white sound tooth and stained areas. These areas may change the fluorescence emission differently depending on the color that is most absorbed by the stain on the tooth surface. Although previous studies have monitored the staining contrast generated by the consumption of beverages on teeth, the information provided is based on total intensity. However, this intensity varies from each QLF device configuration and comparison across studies may not be possible. Few studies report the wavelength-dependent characterization of the staining process, which allow the comparison on the light attenuation on specific wavelengths and can be used to design fluorescence equipment with improved contrast for the tooth color assessment. In this study, we quantified the fluorescence spectral features (fluorescence intensity, wavelength shift of the maximum intensity, full width at half maximum, and wavelength-dependent intensity attenuation) of teeth in several degrees of coffee pigmentation by using 445 nm excitation. Most of the pigmentation effect was observed on the fluorescence intensity and a linear behavior was observed for the full width at half maximum (around 11.8% increase for each pigmentation level). We characterized the fluorescence properties of each degree of pigmentation level. Both spectral features and fluorescence properties can be used to design novel fluorescence equipment capable of increasing the contrast between white and stained teeth.
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Keywords
Fluorescence spectroscopy , Tooth whitening , Tooth color , Fluorescence monitoring , Optical spectroscopy , Violet illumination , Light-induced whitening , Light-induced fluorescence
Citation
Nogueira, M. S., Bagnato, V. S. and Panhóca, V. H. (2020) 'Characterization of teeth fluorescence properties due to coffee pigmentation: towards optimization of quantitative light-induced fluorescence for tooth color assessment', SPIE BiOS 2020, San Francisco, California, United States, 1-6 February. Ibey, B. L. and Linz, N. (eds.) Proceedings of SPIE, Volume 11238, Optical Interactions with Tissue and Cells XXXI, 112381G (9pp). doi: 10.1117/12.2546835
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© 2020, Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.