In order to set the lasing variables and evaluate, clinically, the therapeutic effects of a pulsed Nd:YAG laser on oral lesions, the author applied the laser energy from a fiberoptic delivered, free running, pulsed Nd:YAG laser (wavelength 1064nnm, pulse duration 12D u sec, fiber diameter 200 μ m/320 μ m) to 22 cases of oral soft tissue lesions and 6 cases of oral hard tissue lesions.
The obtained results were as follows :
1. The effective excision with contact mode and the effective hemostasis of accompanied bleeding with noncontact mode were occurred by lacing on oral soft tissue lesions with fiber diameter of 320 μ m under the variables of 2.0-40W and 20-5OHz which were contra led into .high power/low pulses, for excision, low powerMgh pulses for hemostasis, low power in granulation tissue and high power in fibrous tissue according to therapeutic goals and tissue conditions.
2. About 5090 of decreasing effect on hypersensitivity was occurred by lasing with non-contact and contact mode on cervical abrasion which caused dentinal hypersensitivity with fiber diameter of 320μm under the variables of 0.7 - 1.0W and 10Hz which were applied 2-3 times with 1 week interval.
3. The effective sterilization of infected root canal and lesion of periapical abscess was occurred by lasing with contact and spiral modes on wall of root canal and periapical abscess with fiber diameter of 200μm of which the tip was placed about lmm shorter than root canal length under the variables of 1.0W and 10Hz.
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