Temperature changes under Ho:YLF irradiation

摘要

Abstract: A prototype of Er:Tm:Ho:LiYF$-4$/ (Ho:YLF) laser, emitting at 2,065 $mu@m, 1,25 J 5 Hz, with pulsewidth of 250 $mu@s was developed for biomedical applications. In order to verify the possibility of using this laser for cavities preparation in vivo, temperature rise in the pulp chamber must be known. Temperature changes were measured during Ho:YLF irradiation with 500 mJ/pulse, 30 pulses/position with energy density of 2079 J/cm$+2$//pulse. Two groups of teeth were used: group I with pulp chamber empty and group II with pulp chamber filled with phase change material. In both cases, there were no temperature rise above 3,8$DGR@C in the pulp chamber.!19