Fluorescence spectroscopy of dental calculus

Bakhmutov, D; Гончуков, С. А.; Sukhinina, A. V.

doi:10.1002/lapl.200910155

Cited by 17 publications

(9 citation statements)

References 16 publications

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“…In the spectrum of sample 2 (Figure 7), besides three peaks as in sample 1, there is three new peaks at 625 nm, 650 nm and 690 nm. This result is agreeable with the other studies that dental calculus contains porphyrins which absorb UVA and emit a fluorescence signal in the visible red spectral region [19]. The sample 3 was also tested and the result showed the same spectrum as of sample 2 ( Figure 7).…”

Section: Fluorescence Spectrasupporting

confidence: 91%

Application of fluorescence technique in studying dental caries

2015

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The aim of the present study was to investigate the fluorescence properties of sound teeth and teeth with different types of lesions. Using light-emitting diodes operating in the near ultraviolet (UVA) spectral regions for excitation, the obtained fluorescence images and spectra of carious teeth were different from sound teeth spectra due to the presence of bacteria Streptococcus mutans producing metabolites called porphyrins. The sound teeth showed the blue fluorescence with broad emission spectra from 410 nm to 650 nm (maxima at 450 nm, 500 nm and 520 nm), while the carious regions illuminated the red light with three new peaks at 625 nm, 650 nm and 690 nm. The intensity of the red fluorescent signal depends on the density of the bacteria. Based on the red fluorescence emitted by porphyrins, not only the surface lesions but also the caries hiding under the enamel layer can be detected by UVA exciting. These results provide the ability to apply fluorescence technique in the development of an early dental diagnostic tool with a number of advantages such as safety, mobility, low cost and rapid test time.

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Section: Fluorescence Spectrasupporting

confidence: 91%

Application of fluorescence technique in studying dental caries

2015

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“…The fluorescence spectral distribution of demineralized teeth at 0 hour (1), one hour (2), two hours (3), three hours (4), four hours (5), five hours (6), and seventeen hours (7) c 2010 by Astro Ltd.…”

mentioning

confidence: 99%

Pilot study on early detection of dental demineralization based on laser induced fluorescence

et al. 2010

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Laser induced autofluorescence spectroscopy of enamel and teeth at different artificial demineralization stage irradiated by 403 nm semiconductor laser were investigated. The quantitative evaluation parameter of mineral content is built on the basis of the fluorescence characteristic spectrum of 443 nm and 526 nm ratio to the total fluorescence integral. In the end, the dependence of characteristic spectrum on the excitation light power was experimentally investigated. The results reveal that at least 10 mW power is necessary to stimulate the featured spectrum.

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“…Excitation wavelengths located in the spectral ranges from 340 nm to 370 nm and 620 to 645 nm were found most suited for detection of supra-and subgingival calculus. 22,23 In contrast, excitation wavelength around 400 nm was found to be best suited for detection of early enamel demineralization. [24][25][26] Furthermore, quantitative light induced fluorescence (QLF) was used to quantify the enamel demineralization and demineralization depth from a single spectral image.…”

Section: Introductionmentioning

confidence: 86%

Hyperspectral laser-induced autofluorescence imaging of dental caries

Bürmen

Fidler

Pernuš

et al. 2012

Lasers in Dentistry XVIII

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Dental caries is a disease characterized by demineralization of enamel crystals leading to the penetration of bacteria into the dentine and pulp. Early detection of enamel demineralization resulting in increased enamel porosity, commonly known as white spots, is a difficult diagnostic task. Laser induced autofluorescence was shown to be a useful method for early detection of demineralization. The existing studies involved either a single point spectroscopic measurements or imaging at a single spectral band. In the case of spectroscopic measurements, very little or no spatial information is acquired and the measured autofluorescence signal strongly depends on the position and orientation of the probe. On the other hand, single-band spectral imaging can be substantially affected by local spectral artefacts. Such effects can significantly interfere with automated methods for detection of early caries lesions. In contrast, hyperspectral imaging effectively combines the spatial information of imaging methods with the spectral information of spectroscopic methods providing excellent basis for development of robust and reliable algorithms for automated classification and analysis of hard dental tissues. In this paper, we employ 405 nm laser excitation of natural caries lesions. The fluorescence signal is acquired by a state-of-the-art hyperspectral imaging system consisting of a high-resolution acousto-optic tunable filter (AOTF) and a highly sensitive Scientific CMOS camera in the spectral range from 550 nm to 800 nm. The results are compared to the contrast obtained by near-infrared hyperspectral imaging technique employed in the existing studies on early detection of dental caries.

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Fluorescence spectroscopy of dental calculus

Cited by 17 publications

References 16 publications

Application of fluorescence technique in studying dental caries

Application of fluorescence technique in studying dental caries

Pilot study on early detection of dental demineralization based on laser induced fluorescence

Hyperspectral laser-induced autofluorescence imaging of dental caries

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