Abstract
Aqueous solutions of tetracyline hydrochloride (TC) were irradiated with two different sources of high-intensity UV light through quartz and through methacrylate spectrophotometric cuvets to determine the most effective wavelengths for photobleaching discolored TC. Hydrogen peroxide was also added to discolored TC solution. Results were determined spectrophotometrically. Sprague-Dawley rats were given daily intraperitoneal injections of two times the usual human dose of TC. Samples of discolored dentin from the mandibular incisors of these rats were irradiated with the two UV light sources. Results were recorded photographically using stained and nonstained control tooth segments for comparison. The two sources of relatively intense shortwave UV light (200 to 300 nm) successfully photobleached the TC-stained rat dentin within 12 to 24 h. Shortwave UV light appeared to be more efficient for photobleaching of discolored aqueous TC solutions than longer wavelength light. Hydrogen peroxide was seen to bleach discolored aqueous TC solution.
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