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Biomechanical analysis of distalization of mandibular molars by placing a mini-plate
Myungsoon Park,Yonghyun Na,Minbong Park,Janghoon Ahn 대한치과교정학회 2017 대한치과교정학회지 Vol.47 No.5
Objective: The objective of this study was to analyze the patterns of tooth movements when distalization of mandibular molars using a mini-plate took place. A finite element analysis was applied to analyze patterns of tooth movements. Methods: The model of the mandible and teeth were used to build a finite element analysis model, and a mini-plate was inserted in the mandibular ramus. Two different orthodontic forces were established for displacement of mandibular molars. Orthodontic forces were applied at the level of the bracket and at the level of the cemento-enamel junction in the mandibular canine respectively. Results: Applying orthodontic forces at the level of the cemento-enamel junction resulted in a greater biomechanical bodily movement in distalization of the mandibular molars compared to when the orthodontic forces were applied at the level of the bracket. Applying orthodontic forces to the cemento-enamel junction also resulted in unwanted greater extrusive movements in distalization of the mandibular molars compared to the bracket level. Conclusions: With considering the mode of orthodontic teeth movement, applying different vertical orthodontic forces for distalization of mandibular molars can lead to more effective distalization of teeth.
Engineering of alkyl-terminated silicon nanoparticles for the selective filtration of copper ions
황장선,Hoyoung Woo,Taemoo Lee,Joohye Hong,Na-Young Kim,Yonghyun Choi,Yejin Kwon,Jaehee Jang,Semi Yoon,Taejong Paik,Jonghoon Choi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Porous silicon nanoparticles (pSiNPs), particularly those that are electrochemically etched in a top-downmanner, have been employed in variousfields due to their specific properties. Alkyl-terminated pSiNPsbearing a functional group, particularlyCOOH, are known to be specific quenching for copper and arebeing studied in variousfields, such as sensing. The electrons of the alkyl-terminated pSiNPs enrichedwith functional groups react with divalent cations, particularly copper, iron, or silver ions, resulting influorescence quenching. Among them, optimumfluorescence quenching is exhibited by copper ions,which indicates that copper ions are directly reduced to copper nanoparticles. In this study, these alkylterminatedpSiNPs were adsorbed onto afilter paper and reacted with copper ions in water to evaluatethefluorescence change. Based on these results, a selective ionfilter was developed, the quenchingmechanism and reduction of copper ions to nanoparticles were investigated.