Measurement of Bubble Dynamic and Thermal Effect of Er:YAG Laser Irrigation with Different Pulse Widths

doi:10.13701/j.cnki.kqyxyj.2022.05.013

Abstract

Abstract: Objective: To evaluate how different pulse widths affect the bubble dynamic and thermal effect of Er:YAG laser irrigation in single root canal resin tooth model. Methods: Waveforms of Er:YAG laser at different pulse width modes were measured by oscilloscope. The bubble dynamic during Er:YAG laser active irrigation (LAI) process in a single root canal resin tooth model was caught by a high-speed camera, then bubbles' maximum diameter, volume, expansion, and collapse period were counted. Temperature changes in pulp cavity were recorded by thermocouple. Results: The waveform of Er:YAG laser exhibited the properties of relaxation oscillation of solid laser. The first peak pulse width was significantly different between different pulse width modes. The bubbles' diameter, volume, collapse, and oscillation period decreased with the growth of pulse width (P<0.05), while the temperature of irrigation in pulp cavity relatively increased (P<0.05). Conclusion: Shorter pulse width of Er:YAG LAI led to larger bubble volume and lower temperature increase in pulp cavity. It might be more appropriate to apply short pulse width in Er:YAG LAI.

Key words: Er:YAG laser, laser-activated irrigation, pulse width, bubble, thermal effect

ZHAO Sijia, HE Xinyu, LI Yizhou, DONG Xiaoxi, NIE Mingyuan, PAN Chong, ZHAO Jizhi. Measurement of Bubble Dynamic and Thermal Effect of Er:YAG Laser Irrigation with Different Pulse Widths[J]. Journal of Oral Science Research, 2022, 38(5): 454-458.

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