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Proceedings Paper

Comparison of laser spectroscopic PNC method with laser integral fluorescence in optical caries diagnostics
Author(s): Victor I. Masychev
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Paper Abstract

In this research we represent the results of approbation of two methods of optical caries diagnostics: PNC-spectral diagnostics and caries detection by laser integral fluorescence. The research was conducted in a dental clinic. PNC-method analyzes parameters of probing laser radiation and PNC-spectrums of stimulated secondary radiations: backscattering and endogenous fluorescence of caries- involved bacteria. Ia-Ne laser ((lambda) equals632.8 nm, 1-2 mW) was used as a source of probing (stimulated) radiation. For registration of signals, received from intact and pathological teeth PDA-detector was applied. PNC-spectrums were processed by special algorithms, and were displayed on PC monitor. The method of laser integral fluorescence was used for comparison. In this case integral power of fluorescence of human teeth was measured. As a source of probing (stimulated) radiation diode lasers ((lambda) equals655 nm, 0.1 mW and 630 nm, 1 mW) and Ia-Na laser were applied. For registration of signals Si-photodetector was used. Integral power was shown in a digital indicator. Advantages and disadvantages of these methods are described in this research. It is disclosed that the method of laser integral power of fluorescence has the following characteristics: simplicity of construction and schema-technical decisions. However the method of PNC-spectral diagnostics are characterized by considerably more sensitivity in diagnostics of initial caries and capability to differentiate pathologies of various stages (for example, calculus/initial caries). Estimation of spectral characteristics of PNC-signals allows eliminating a number of drawbacks, which are character for detection by method of laser integral fluorescence (for instance, detection of fluorescent fillings, plagues, calculus, discolorations generally, amalgam, gold fillings as if it were caries).

Paper Details

Date Published: 21 May 2001
PDF: 5 pages
Proc. SPIE 4244, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI, (21 May 2001); doi: 10.1117/12.427776
Show Author Affiliations
Victor I. Masychev, Rosslyn Medical Ctr./Moscow Office (Russia)


Published in SPIE Proceedings Vol. 4244:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI
Lawrence S. Bass; Abraham Katzir; David S. Robinson; Hans-Dieter Reidenbach; Eugene A. Trowers; Timothy A. Woodward; Kenton W. Gregory; Lou Reinisch; C. Gaelyn Garrett; Kenneth Eugene Bartels; Lloyd P. Tate; George M. Peavy; Michael D. Lucroy; R. Rox Anderson; Kenneth Eugene Bartels; Lawrence S. Bass; C. Gaelyn Garrett; Kenton W. Gregory; Abraham Katzir; Nikiforos Kollias; Michael D. Lucroy; Reza S. Malek; J. Stuart Nelson; George M. Peavy; Hans-Dieter Reidenbach; Lou Reinisch; David S. Robinson; Lloyd P. Tate; Eugene A. Trowers; Timothy A. Woodward; Reza S. Malek, Editor(s)

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