2004 Volume 15 Issue 2 Pages 61-66
In this paper, the removal-monitoring method is introduced and its feasibility for cavity formation is investigated with two kinds of pulsed YAG laser beam. The audible sound generated is measured under several process conditions, and the relation between the measured sound pressure level and the achieved removal rate of dental tissue is examined. The sound pressure level agrees well with the amount of removal by the laser irradiation. The sound pressure level increases as the laser power becomes large, and hence the depth of cavity formed increases. A high sound pressure is measured when an absorbent is evaporated, and the pressure becomes small with the increase in the depth of cavity, because the distance between a processing point and focal point increases.