Analysis of the action spectrum of tetracycline discolouration and the efficacy of intense light sources for its treatment

TL;DRAbstract

Tooth discolouration following either the use of endodontic medicaments containing tetracyclines or systemic tetracycline antibiotics during tooth formation is common and well-documented. It is known that light is responsible for promoting the discolouration of tetracycline in endodontic medicaments. Currently, there have been no studies into the wavelength of light (action spectrum) responsible for this discolouration. Broader studies suggest that numerous factors, including the presence of certain ions, the pH, or oxygen tension, could influence the rate of discolouration. Further, this discolouration is difficult to treat with conventional bleaching methods. In the following thesis, the wavelength of light responsible for promoting the discolouration of the tetracycline molecule is determined, as well as the influence of various ions, oxygen tension and pH. Subsequently, treatment of tetracycline discolouration was undertaken with coherent and non-coherent light activated bleaching

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