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ePaper created 2017-01-04, 09:21:41 | version 1.38.0
23 4 2016 laser industry | idly, leading to microexplosion heard in the typical form of a short acute sound.6 During work, a certain amount of heat is emitted, being dispersed together with the removed material. Only its small part is transferred to the surrounding tissue. This process, based on maximal reduction of the thermal effects, has been tested for more than 30 years, and still fo- cusesondeterminingthemostoptimumparameters of the laser beam for minimally invasive work.7–9 The thicknessoftheevaporatedsurfacelayer(thedepth of ablation) depends on the tissue parameters (the depth of absorption of laser radiation, thermal con- ductivity coefficient, temperature diffusion coeffi- cient, and heat evaporation coefficient), and the laser beam parameters (wavelength, energy density and duration of the laser pulse). At high energies and pulses of short duration the entirelaserenergyisconsumedintheso-calledcold ablation because ablation speed is higher than the speedatwhichtheheatpassesintothetissue.How- ever, using too little energy and/or too long pulse duration leads to an increased heat transfer to the deeperlayersofthetooth.10 Thermaleffectsbecome morepronouncedandthereforewearedealingwith the so-called warm and hot ablation, bearing in mindthatthisisanundesirablephenomenon.Inthe preciseandsafeproceduresofthetherapeuticwork Fig. 1: Laser screen. The parameters of Er:YAG laser: H14/conical tip, QSP, 0,90 W/90 mJ, 4 W/4 A. Figs. 2 & 3: Tips dedicated to preparation of the cavity. Fig. 1 Fig. 2 Fig. 3 42016