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RISS 인기검색어
- 검색키워드
- 저자 : 황준호(JunHo Hwang) (검색결과 62 건)
- 무료
- 기관 내 무료
- 유료
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황준호,권성민,이찬우,김현덕,김임선,이규복,Hwang, Junho,Kwon, Sung-Min,Lee, ChanWoo,Kim, HyunDeok,Kim, Im-Sun,Lee, Kyu-Bok 대한치과보철학회 2019 대한치과보철학회지 Vol.57 No.1
Purpose: The laser processability of dental prosthesis is investigated using two ceramic composites, including 3M, Lava Ultimate and Ivoclar vivadent, IPS e.max. Materials and methods: The $CO_2$ laser, picosecond laser and femtosecond laser are used to assess the processing power of dental prosthetic materials Lava Ultimate and IPS e.max and the line processing shape was measured using a confocal microscope. Results: The brittleness, carbonization and micro crack of the ceramic composite were influenced by heat accumulation of the material and could be controlled by the laser power and pulse time. Conclusion: In the case of $CO_2$ lasers, micro crack and carbonation occurred immediately, and in the picosecond laser processing, the micro cracks are partially improved, but the carbonization occurs continuously. Finally, we confirmed the high efficiency of laser processing with femtosecond laser. In particular, Lava Ultimate, a ceramic resin composite material, showed the best processability when processed using a femtosecond laser.
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공정 파라미터에 따른 금속분말(SUS316L, IN718) 레이저 적층 표면 및 단면 특성 분석
황준호(JunHo Hwang),신성선(SeongSeon Shin),이종훈(JongHoon Lee),김성욱(SungWook Kim),김현덕(HyunDeok Kim) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.3
The authors derived the criteria on the process parameters of laser depositions with metal powers(SUS316L & IN718) by evaluating the surface and cross-section properties of the deposition layers. The surface characteristics of the deposition layer are investigated through optical microscopy by controlling the process parameters of laser output, powder feeding rate and gas feeding rate. The cross-section characteristics were also analyzed after polishing and chemical etching process. As the gas feeding rate increased, the amount of powder loss increased and the difference in the dilution ratio and heat affected zone depending on laser outputs was observed. In addition, the powder feeding rate used in the experiment did not interfere with the energy absorption of the base material.
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금속 3D 프린터로 제작된 치과용 보철물의 정확도 평가
황준호(Junho Hwang),김윤호(Yun-Ho Kim),김현덕(Hyun-Deok Kim),이규복(Kyu-Bok Lee) 대한용접·접합학회 2018 대한용접·접합학회지 Vol.36 No.5
Recently, in the era of the fourth industrial revolution, the main technology trend of digital dentistry is to make dental prostheses using 3D printer. In this study, we evaluated the accuracy of dental prostheses(coping) made with metal 3D printer. The equipment used in the experiment are Cr-Co 3D printer, 3D scanner, Analysis Software(Geomagic). and Experimental process parameters are hatching(1way, cross, counterclockwise) and orientation(0 degrees, 45 degrees, 90 degrees). The 3D printing accuracy of the dental prostheses(coping) was excellent for “Hatching cross” and “Orientation 90 degrees.” That is, The dental prostheses(coping) manufactured by using 3D printer has higher accuracy with higher heat emission. If the angle of orientation is less than 45 degree, the roughness of the lower part of the coping is not particularly good. and this has a negative effect on the suitability of inner side crown.
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RISS
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