Translucency of Human Dental Enamel

Abstract

Translucency of human dental enamel was determined by total transmittance of wavelengths from 400 to 700 nm. The transmission coefficient at 525 nm was 0.481 mm-1. Total transmission of light through human dental enamel increased with increasing wavelength. Human tooth enamel is more translucent at higher wavelengths. The translucency of wet human enamel and enamel after dehydration was also measured by total transmittance. The transmission coefficient at 525 nm decreased from 0.482 to 0.313 mm-1 after dehydration and was reversed on rehydration. The decrease in translucency occurred as a result of the replacement of water around the enamel prisms by air during dehydration.

Optical properties of manually and CAD/CAM-fabricated polymers

“…For total transmission measurements, the samples were placed at the entrance port of the integrating sphere, as described by Brodbelt et al 18) In order to complete the integrating sphere, a barium sulphate standard was used. The intensity of the monochromatic light, I 0, and the light, I, transmitted through the specimen was continuously measured at 2 nm intervals at visible light wavelengths (λ) from 400 nm to 700 nm.…”

Crown Discoloration Induced by Endodontic Sealers: Spectrophotometric Measurement of Commission International de I'Eclairage's L*, a*, b* Chromatic Parameters

“…During the measuring process all teeth remained wet in order to prevent enamel color alterations caused by drying. 26 Measurements were carried out by the same operator (KI).…”

Red-shifted fluorescence of sound dental hard tissue

“…As the excitation laser wavelength increases, the depth of penetration also increases. 19 Therefore, it is expected that excitation at 635 and 532 nm would not only interrogate enamel but likely contain a contribution from the enamel dentin junction as well as the dentin, whereas 405 nm would be more localized to the enamel. As such, 405 nm excitation should theoretically excite less fluorophor than the longer wavelengths because it is more highly attenuated.…”