Numerical and experimental study of excited light and auto-fluorescence diffusion in teeth

Chen, Q. G.; Lin, Bin; Chen, Z. B.

doi:10.1134/s1054660x10190035

Cited by 3 publications

(2 citation statements)

References 23 publications

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“…As the experiments progressed, the changing of flu orescence spectroscopy distribution was found because of the difference of light tissue interaction region, which has been investigated theoretically and experimentally by the former work [24]. Thus, the flu orescence spectra of two site of pit and fissure and cusp on the occlusal surface was measured and compared at various laser power levels.…”

Section: Data Acquisitionmentioning

confidence: 96%

Study of validity of autofluorescence-based incipient occlusal caries detection in vitro compared to DIAGNOdent pen

et al. 2012

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The validity of laser induced fluorescence spectroscopy for early diagnosis of occlusal caries irra diated by 403 nm diode laser compared to commercial device DIAGNOdent pen was investigated. The quan titative evaluation parameter based on the fluorescence intensity area ratio of different bands F(440-480 nm)/F(540-700 nm) was built. And the linear correlation analysis between fluorescence result and cor responding DIAGNOdent reading is performed to be r = -0.9085. Moreover, the factors of irradiation laser power and excited site influencing the fluorescence distribution was experimentally investigated. The result shows that the fluorescence spectra at different site of sound occlusal surface is different and the higher laser power will lower the sensitivity of evaluation parameter based on the red fluorescence region increasing. The work is of great significance for practical application of laser induced fluorescence at 403 nm.

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Section: Data Acquisitionmentioning

confidence: 96%

Study of validity of autofluorescence-based incipient occlusal caries detection in vitro compared to DIAGNOdent pen

et al. 2012

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“…In the study of Chen Q.G. et al [18], the dependence of excited light (405 nm) and autofluorescence (500 nm) density distribution inside the teeth model on the scattering coefficient µs of enamel (µs = 5-25 mm -1 ) and dentine (µs = 100-140 mm -1 ) is numerically simulated and analyzed. The results showed that the fluence at the end of enamel layer is over 95% of the value on the surface.…”

Section: Fluorescence Imagingmentioning

confidence: 99%

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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Use of zinc to increase fluorescence in an in vitro biofilm model as a tool for caries diagnosis

Wichachang

Locharoenrat

2021

Opt. Mater. Express

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Artificial sound enamel and caries enamel lesions were prepared. The sound enamel did not emit fluorescence in the visible spectrum. The spectrum of Zn(II)-protoporphyrin-9 biofilm from caries enamel lesions showed the fluorescence emitted by Zn(II)-protoporphyrin-9, with two main peaks at 630 and 690 nm. The luminescence properties of protoporphyrin-9 change depended on the amount of Zn(II). The increase in fluorescence intensity as Zn(II)-protoporphyrin-9 penetrated deeper to 1.75 mm was appropriate for the diagnosis of caries enamel lesions. Fluorescence intensity was maximum when Zn(II) reached 0.0256 µM and significantly produced a high contrast of fluorescence image together with high fluorescence quantum efficiency and photostability.

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Numerical and experimental study of excited light and auto-fluorescence diffusion in teeth

Cited by 3 publications

References 23 publications

Study of validity of autofluorescence-based incipient occlusal caries detection in vitro compared to DIAGNOdent pen

Study of validity of autofluorescence-based incipient occlusal caries detection in vitro compared to DIAGNOdent pen

Application of fluorescence technique in studying dental caries

Use of zinc to increase fluorescence in an in vitro biofilm model as a tool for caries diagnosis

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