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LAMMP Seminar Video
EFFECTS OF LASERS ON CHEMICAL COMPOSITION OF HARD TISSUES
Denise Zezell, DDS, PhD

The knowledge of the laser-tissue interaction is fundamental in order to understand the laser action and its possible benefits in diagnosis and therapy. This presentation will be an overview of current studies, mainly in Dentistry, performed at Center for Lasers and Applications at IPEN/USP-SP, Brazil. The first part of the presentation is dedicated to the effects of infrared lasers, such as Er,Cr:YSGG , Er:YAG and Nd:YAG lasers, on enamel and dentin microstructure, when applied for preventing dental caries. Compositional and crystallographic analysis via μ-FTIR and X-ray diffraction, as well as morphological changes of these tissues were correlated with temperature changes in the process of artificial caries, complemented with in vivo studies were performed to evaluate the efficacy of laser treatments. The second part of the presentation presents the interaction of infrared and fs-high intensity lasers when used for cutting enamel, dentin, bone and restorations, when a new method was developed for determining the ablation threshold of different tissues, opening the possibility for selective removal of restorative material. Lasers were also used for caries diagnosis, and other techniques such as OCT and fluorescence spectroscopy were tested in vitro and in vivo. The effects of low-intensity lasers on dental hard tissues, bones and skin were also evaluated, and in this way it was possible to choose laser wavelength and irradiation parameters for a better clinical performance.


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