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J Korean Acad Pediatr Dent. 2001;28(4): 683-693.
EFFECTS OF ER:YAG LASER ABLATION ON THE DENTIN
최남기1, 양규호1, 박상원2, 김옥준3
1전남대학교 치과대학 소아치과학교실, 치의학 연구소
2전남대학교 치과대학 보철과학교실, 치의학 연구소
3전남대학교 치과대학 구강병리학교실, 치의학 연구소
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ABSTRACT
The purpose of this study was to evaluate the effects of Er:YAG laser on cutting efficacy and its histologic findings. Dentin specimens of human premolars and molars were used and irradiated by Er:YAG laser with noncontact handpiece type delivery system under different treatment condition of irradiation time. Cavity pattern and volume were evaluated to determine the cutting efficacy and following results were obtained. 1. Cutting volume of sound dentin was getting larger with time immersed in water increase 2. With the condition of irradiation (150mJ, 10Hz, 30sec), surface irregularity was more increased in sound dentin comparing to carious dentin. For the light microscopic examination, dentinal tubules were opened and ash flecks and cracks were noted with inconsistence of dentinal tubules. 3. In case of 30 sec. irradiation in carious dentin, dark zone was limited to small focus whereas 1 min. irradiation, more wider, and cracks were noted in the perpendicular to direction of dentinal tubules. For the 2 min. irradiation, cavity was the widest and more cracks were found.
Keywords: Laser | Er:YAG | Dentin | Cutting volume | Histologic finding
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