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[PE-0079] Multi-trait GWAS of grain shape study with advanced breed lines of Korean rice
Muhyun Kim(Muhyun Kim),Tae-Ho Ham(Tae-Ho Ham),ByeongYong Jeong(ByeongYong Jeong),MiYoung Park(MiYoung Park),Yeong Shin(Yeong Shin),Yeonju Kim(Yeonju Kim),Min Young Song(Min Young Song),Joohyun Lee(Joo 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Modified Continuous Wave Technique을 이용한 근관충전시 형성된 치근단 크기가 치근단 폐쇄에 미치는 영향
류무현,정일영,이승종,신수정,김의성 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.1
본 연구에서는 근관형성의 치근단 크기가 근관 충전의 치근단 폐쇄에 미치는 영향에 대해 알아보고자 하였다. 36개의 단근관, 단근치를 대상으로 3가지 치근단 크기 (Master apical file : #25, #40, #60)에 따라 3가지 실험군으로 나누어 Profile^(ⓡ) LightSpeed^(ⓡ)를 이용하여 근관을 확대하고, Modified continuous wave technique으로 근관 충전을 시행하였다. 미세누출의 측정을 위해 실험군당 10개의 치아를 1주일간 India ink에 넣어 색소 침투를 일으키고 치아를 투명화시켜 미세누출의 정도를 측정하였다. 미세누출에 치근단 크기가 미치는 영향을 분석하기 위하여 Kuskal-Wallis one-way ANOVA를 시행하였고, 사후 검정을 위하여 Student-Newman-Keuls method를 시행하였다. 또한, 치아 단면의 형태를 관찰하기 위하여 색소 침투까지 실행된 각 실험군당 2개의 치아를 근첨 1 ㎜에서 4 ㎜까지 1 ㎜간격으로 수평 절단하고 사진 촬영하였다. 각 실험군에서 측정된 미세누출양을 Kruskal-Wallis one-way ANOVA에서 분석 한 결과 치근단 크기는 유의성 있게 (P < 0.05) 미세누출에 영향을 미쳤으며 치근단 크기가 클수록 미세누출의 평균값과 표준편차 값은 감소하는 경향을 보였다. Student-Newman-Keuls method를 통한 사후 검정에서 치근단 크기가 #25 - #40, #25 - #60에서 유의한 차이를 보였으며 #40 - #60간에는 통계적인 유의차는 없었다. 단면형태에서는 대부분의 치아에서 난원형의 근관 형태를 관찰 할 수 있었고, 치근단의 크기가 작을수록 성형된 근관에 불규칙한 내면이 존재하였고 gutta-percha나 sealer로 충전되지 않는 recess의 면적 이 증가함을 알 수 있었으며 이러한 recess는 미세누출의 통로가 됨을 확인 할 수 있었다. 본 연구 결과, Modified continuous wave technique으로 근관충전시 근관 형성된 치근단 크기가 커질수록 보다 일관되고 성공적인 결과를 예상할 수 있는 근관충전을 시 행할 수 있음을 알 수 있었다. This study examined the influence of the apical sizes on the sealing ability of a root canal filling. Thirty-six single rooted teeth with a single canal were divided into 3 groups (n = 12) and instrumented with either the Profile^(ⓡ) or LightSpeed^(ⓡ) system to achieve three different apical sizes (master apical file (MAF) of #25, #40, or #60). The teeth were filled with gutta percha using a modified continuous wave technique. The level of microleakage was determined by immersing ten teeth from each group into India ink for 1 week followed by clearing with nitric acid, ethyl-alcohol, and methylsalicy late. The microleakage was measured using vernier calipers. The data was analyzed statistically using Kruskal-Wallis one-way ANOVA and a Student-Newman-Keuls Method. Two teeth from each group were sectioned horizontally at 1, 2, 3 and 4 ㎜ from the apex in order to observe a cross section. The apical size was significantly (p < .05) influenced the level of microleakage. In the Student-Newman-Deuls Method, MAF sizes of #25 and #40; and MAF sizes of #25 and #60, respectively showed a statistically significant difference. There was no significant difference between #40 and #60. In most cross sections, oval-shaped canals were observed, and the irregularity of the internal surface increased with decreasing apical size. There was also an increase in the area of recess, which is the area where the canal space is not filled with either gutta-percha or sealer. When the root canals are filled using a modified continuous wave technique, canal filling with more consistent and predictable outcome may be expected as the apical preparation size is increased.
Kwangwoo Cho,Junha Choi,Changdeok Ko,Muhyun Kim,Joohan Lee,Eunhyang Eom,Sung-Hak Cho 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.2
Glass is widely used for various applications, including flat panel displays, solar panels, architectural windows, and exterior materials. These applications exhibit increasing complexity and improved functionality. In particular, glass substrates used in display panels require diverse forms of processing, prompting the exploration of laser applications to enhance processing quality, yield, and efficiency. This study aims to investigate the feasibility of using a high absorption, 257 nm femtosecond laser for processing glass substrates. The goal is to minimize damage and eliminate the need for post-processing, and ensuring superior quality and cross-sectional features. The analysis focuses on the influence of energy density and laser beam overlap ratio on processing variations. Point, line, and area processing were conducted within the achievable energy density range of 2.4–10.8 J/cm2. The results indicate that as the overlap ratio increases, processing depth, influenced by heat accumulation, exhibits a non-linear growth pattern. Moreover, the phenomenon of excessive processing width, surpassing design specifications, is mitigated by utilizing burst pulses that induce heat accumulation of ultra-short pulse lasers, thereby promoting increased processing depth while restraining width expansion. By comparing the outcomes of glass substrate processing using different laser wavelengths and pulse durations, it is confirmed that employing a 257 nm femtosecond laser minimizes damage, cracks, and chipping in the processed areas, obviating the need for post-processing. This paper presents the pioneering research on glass processing using deep ultraviolet femtosecond lasers. Results indicate that clear glass ablation is achieved without cracks.