The purpose of this study was to investigate the effects of Gallium-Arsenide laser irradiation on the mechanically exposed pulp of dog.
The anterior and posterior teeth of three dogs, weighting 10kg, were used in this study. Class V cavities on dog’s teeth were prepared and the pulps were mechanically exposed.
In control group, exposed pulps were capped with Dycal(r)and cavities were sealed with IRM(r).
In experimental group I and II, the exposed pulps were irradiated with Ga-As laser(Dens-Bio laser, Dong Yang Medical Co., Korea, output power ; 27mW, wave length ; 904nm, freguency ; 10,000Hz pulse width ; 200ns) for 2 minutes and 4 minutes each
and
then they were capped with the same as those of the control group.
In experimental group III and IV, the exposed pulps were covered by aluminum foil and sealed with IRM(r) after irradiation with the laser for 2 minutes and 4 minutes each.
The animals were sacrificed at the postoperative 1, 3, 5 week for histologic studies.
@ES The following results were obtained in this study ;
@EN 1. Dentinal bridge was formed more fast and broadly in the experimental group I, II than other groups but there were no histologic differences in the degree of its formation among control group, experimental group III, IV.
2. Odontoblastic activity at amputated pulp was increased in the experimental group I, II than other groups but there were no histologic differences in the odontoblastic activity among control group, experimental group III, IV.
3. The inflammation was severe at the postoperative 1 week of all groups, but its condition subsided with time. At the postoperative 3, 5 week, its condition in the experimental group I, II was less severe than that in the control group, but its
condition in the experimental group III, IV was not different with that in the control group.
4. There were no histologic differences among all the experimental groups according to the duration of laser irradiation time.
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