Abstract
In spite of the reasonably large number of works relating to CO 2 laser irradiation of teeth, the effects of power level and impact time on dentine have not yet been analysed in detail, in particular the effects of power level on the development of microcracks and the blocking phenomenon of tubules. For this purpose, thermal effects were investigated by single and multiple impacts on dentinal hydroxyapatite. Results obtained from numerous samples show that laser irradiation may produce deep craters, the size of which depends on the power level and duration of the laser beam. The craters thus formed are composed of three distinct heat-affected zones. Formation of the craters is accompanied by the development of microcracks in the heat-affected zones as well as in the non-affected region surrounding the craters. Compositional, phase and structural changes are observed. An increase in hardness and the blocking of dentinal tubules in the thermal-affected zone were detected.
Published Version
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