A STUDY ON THE EFFECT OF THE ND:YAG LASER IRRADIATION ON THE MECHANICALLY EXPOSED PULP

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Journal of the Korean Academy of Pediatric Dentistry 2002;29(2):146-158.
Published online May 31, 2002.

A STUDY ON THE EFFECT OF THE ND:YAG LASER IRRADIATION ON THE MECHANICALLY EXPOSED PULP

기계적 노출치수의 Nd:YAG 레이저 조사효과에 대한 연구

이상호, 이창섭, 김수관

조선대학교 치과대학 소아치과학교실.구강생물학 연구소

Abstract

The purpose of this study was to investigate the effects of Nd:YAG laser on mechanically exposed pulp of dog by the observation of pulpal inflammatory change and heal process including dentinal bridge, structural changes of fibroblasts of thr remaining vital pulp tissue. In experimental group 1, the exposed pulps were irradiated with Nd:YAG laser(3W, 30Hz, 0.2sec) for $2{\sim}3$ 수식 이미지 second followed by capped with aluminium tin foil. In group 2 and group 3, the exposed pulps were irradiated with Nd:YAG laser via contact(Group 2) and non-contact(Group 3) methods followed by capped with calciumhydroxide paste. The animal were sacrificed at the intervals of 3, 7, 14 and 30days for histologic evaluation. The results were as follows : 1. The dentinal bridges were formwd more fast and broadly in the experimental group 1 and 2 than other groups, but there were no histologic differences in the degree of their formation among control group, experimental group 1. 2. Odontoblastic activities at amputated pulp was increased in the experimental group 2, 3 than other group but there no histologic difference in the odontblastic activitiy among control group, experimental group 1. 3. The infalmmation was severe at the postoperative 1 week of all groups, but its condition subsideed with time elapsed. At the postoperative 3, 7 days, its condition in experimental group 2, 3 were less severe than in the group 1. 4. There were no histologic differences between the experimental group 2 and 3 according to the degree of dentin bridge formation.

Key Words: Nd:YAG Lase, Calcium hydoxide, Dentinal bridge