In vitro study of the effects of Nd:YAG laser probe parameters on bovine oral soft tissue excision.
OBJECTIVE
Lasers are now used for intraoral, soft tissue procedures. The effects of Nd:YAG probes on cutting efficiency and temperature rise were evaluated in vitro.


METHODS
Three hundred twenty-micron 400-microns, 500-microns, and 600-microns probes were used to ablate bovine gingiva, mucosa, and tongue at various power and frequency settings. Thermocouples positioned under the subjacent cortical bone measured temperature rise. Tissue samples were evaluated histologically.


RESULTS
Mean pooled temperature rise was 1 degree C at 3 W and 1.4 degrees C at 5 W. Excision width ranged from 0..63 mm to 0.79 mm at tested settings, cutting depths from 0.19 mm to 0.49 mm, lateral and deep coagulation from 0.27 mm to 0.62 mm.


CONCLUSIONS
Temperature rise in bone was related to increased power. Cutting efficiency of laser probes was not significantly improved by increased power. Probes of 320 to 500 microns provided efficient cutting at 3 W and 5 W, thus reducing the potential for unacceptable temperature rise in bone.
Perry
D A
DA
Department of Dental Public Health, University of California, San Francisco 94143, USA.
Goodis
H E
HE
White
J M
JM
D000818:Animals; D002417:Cattle; D066298:In Vitro Techniques; D017075:Laser Coagulation; D053685:Laser Therapy; D009055:Mouth / Q000601:surgery*; D013696:Temperature