Abstract
ABSTRACT The goal of the study was to verify differences between the alexandrite and Er:YAG laser energy distribution in the rootcanal and in the surrounding dentin and bone tissues. For the experiment, two lasers were prepared: the Er:YAG laser(A.=2.94 im) with a delivery system fluorocarbon polymer-coated silver hollow glass waveguide ended by a special sapphiretip and the alexandrite laser (X0.75 tm) with a silicon fiber. The Er:YAG laser was operated in a free-running mode, thelength ofthe generated pulses was 250 tsec and the output energy ranged from 100 to 350 mJ. The pulse length ofthe free-running alexandrite laser was 70 psec and the output energy was ranged from 80 up to 200 mJ. For the experiment preparedroot canals of molars were used. lt was ascertained that the radiation of the alexandrite laser passes through the root canaland hits the surrounding tissue. Nocardia asteroides, Filaments, Microccocus albus, Lactobacillus sp and Streptococcussanguis colonies were treated by the Er:YAG or alexandrite laser radiation. The surface was checked by scanning electronmicroscopy. From the result it follows that the Er:YAG laser destroyed microbial colonies but the difference is in the depthof the affected area.Keywords: dentistry, endodontics, Er:YAG laser, alexandrite laser
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