engleski

Vibrations produced during Er:YAG laser irradiation

The purpose of the study is to evaluate vibrations of Er:YAG laser in non-contact mode and to compare the vibrations with different pulse lengths and energy parameters. The experiment was conducted on extracted human premolar which was built up in the silicone impression material. Vibrations of the Er:YAG laser were measured for super short pulse (SSP), very short pulse (VSP), short pulse (SP) and MAX mode at frequency of 5 Hz during 1 second. For VSP and SP energy parameter tested were 200 mJ, 300 mJ, 400 mJ and 500 mJ. For SSP mode instead of 500 mJ the last energy parameter was 450 mJ. MAX mode was tested at 1 000 mJ as energy parameter enabled at that pulse mode. The vibrations were measured by Piezoelectric accelerometer. For each irradiation energy the measurements were preformed 15 times. The results were expressed in m/s2. Results of this study showed that Er:YAG laser caused vibrations in non-contact mode. The highest values of vibrations were measured for MAX mode (0.62± ; ; 0.06 m/s2), and the lowest vibrations were measured for VSP mode at energy parameter 200 mJ (0.05± ; ; 0.02 m/s2). There was a statistically significant (F=103.5, p<0.01) difference between the laser pulse modes (SSP, VSP, SP). The main effect of energy parameter was also significant (F=358.2, p<0.01). According to this study Er:YAG laser produced vibrations in non contact mode depending on energy parameter and pulse mode. However, measured values were also compared to vibration values in classical drilling method.

vibrations ; Er:YAG laser

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