Journal of the korean academy of Pediatric Dentistry (대한소아치과학회지)
- Volume 28 Issue 1
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- Pages.32-44
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- 2001
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- 1226-8496(pISSN)
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- 2288-3819(eISSN)
ANALYSIS OF ER:YAG LASER IRRADIATION ON CUTTING EFFICACY AND TEMPERATURE CHANGES OF DENTIN
Er:YAG 레이저의 상아질 삭제효과 및 이에 따른 온도변화
- Im, Kwang-Ho (Department of Pediatric Dentistry, Oral Biology Institute, College of Dentistry, Chosun University) ;
- Lee, Chang-Seop (Department of Pediatric Dentistry, Oral Biology Institute, College of Dentistry, Chosun University) ;
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Lee, Sang-Ho
(Department of Pediatric Dentistry, Oral Biology Institute, College of Dentistry, Chosun University)
- 임광호 (조선대학교 치과대학 소아치과학교실, 구강생물학연구소) ;
- 이창섭 (조선대학교 치과대학 소아치과학교실, 구강생물학연구소) ;
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이상호
(조선대학교 치과대학 소아치과학교실, 구강생물학연구소)
- Published : 2001.02.28
Abstract
The purpose of this study was to investigate the effects of Er : YAG laser on cutting efficacy and temperature changes of dentin. We used the dentin specimens of human premolars and molars which contain the physiologic saline and maintain the pulpal pressure in dentinal tubules. Each specimen was exposed to Er : YAG laser with non-contact handpiece type delivery system under different treatment condition of irradiation energy, pulse repetition rate, and exposure time. Two procedures were conducted by the presence of water flow during lasing. The specimens were grouped by thickness of dentin. We investigated the cavity pattern, volume, and temperature change of dentin specimen to determine the cutting efficacy and temperature rise of Er : YAG laser, and obtained following results. 1. Cutting volume of dentin was increased by increasing the irradiation energy, pulse repetition rate, and exposure time(P<0.05). 2. Margins of abulated cavities were sharp and clean and floors of cavities were conical in shape and showing smooth surfaces. Upper diameter of abulated cavities were increasing as laser parameter of irradiation energy, pulse repetition rate, and exposure time were increased. A few cracks were observed on abulated surfaces under treatment condition of laser parameter with 150mJ, 5Hz, and 5sec. 3. Temperature was increased as laser parameter of irradiation energy, pulse repetition rate, and exposure time were increased, and temperature rise was decreased as dentin thickness was increased(P<0.05). 4. Temperature rise was decreased under water flow compared with no water flow during laser exposure(P<0.05). From these results, we think that the method of using a Er:YAG laser would be effective and safe in cutting dentin for clinical application.
Er : YAG 레이저의 상아질 삭제효과와 이에 따른 온도변화를 평가하고자 발거된 소구치와 대구치로 상아세관내 조직액과 치수내압을 유지할 수 있는 상아질 시편을 제작하고