Выбор длины волны излучения для визуализации трещин зубной эмали

Abstract

We investigated the influence of the spectral distribution of light to optical contrast of cracks in solid tissues of human teeth in photographic images and under visual inspection. We carried out a coloristic analysis of an object areas of a digital photos of several patients oral which made under the optimal conditions for photographing. We determined the average optical contrast of enamel cracks for each of RGB- components. We have shown that a blue color in the RGB color model gives a greatest contribution to the overall contrast of the crack on alive tooth enamel. With the light sources of different colors (light-emitting diodes with the distinct single maxima in their radiation spectra), we visually examined contrast of discolored crack on tooth enamel. We found that unpigmented cracks are most visible both with photographing and with the naked eye when their are illuminated by diffused green radiation. We proposed and made a compact device with exchangeable nozzles on the base of light diodes for visualization of non-coloured and imperceptible with usual illumination enamel cracks by transillumination and direct illumination.