Bulg. J. Phys. vol.33 no.1 (2006), pp. 55-67

Investigation of Dental Caries Using Laser and Light-Induced Autofluorescence Methods

E. Borisova1, Tz. Uzunov2, L. Avramov1
1Institute of Electronics, Bulgarian Academy of Sciences, BG-1784 Sofia, Bulgaria
2Medical University, Dentistry Department, Sofia, Bulgaria
Abstract. The aim of this study was to investigate the intrinsic fluorescence in human teeth in vitro and its correspondence to the stages of the carious lesions using different excitation sources. Fluorescence spectra of teeth illuminated with light with wavelengths of 337, 440 and 488 nm were recorded. The spectra were obtained from the healthy, pre-carious and carious stages of the teeth investigated. Fluorosa dentis and odontolithiasis lesions were also studied to determine the effect of other pathologies on the teeth fluorescence spectra. We observed a significant decrease of the autofluorescence signal intensity related to the carious stage. The carious samples also revealed characteristic emission with fluorescence bands in the red spectral region which relative peak intensity increases depending on the stage. Healthy hard dental tissue exhibited no emission bands in the long-wave region.

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