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PMMA Micropheres (Artecoll)의 임상적 이용과 조직학적 소견
강유미,전용욱,최한영,최해천,곽동렬 大韓成形外科學會 1998 Archives of Plastic Surgery Vol.25 No.7
Many attempts have been made to correct wrinkles or scar artificial or biological materials during the past decades. However artificial implants(fluid silicone, bioplastique, collagen) might be appeared in the form of dislocation, granuloma formation, or late allergic reaction many years later. Biological materials (bone, tendons, cartilage, fat) tend to be resorbed, and same injections are repeated. Recently, PMMA microspheres (Artecoll) have been applied to correct deep glabellar frowns, wrinkles, and scar. Artecoll is an injectable implant for the long-lasting correction of wrinkles and the other irregular surfaces. We obtained specimens of Artecoll for histopathology which injected in the upper for the correction of triple fold deformity. As a results, the histological findings of imbedded PMNA microspheres resemble that of fat cell closely and showed capsule formation around Artecoll compartments. Each microsphere was covered with collagen fibers, so that the distance between microspheres was decreased. The volume of monocytes seemed to diminish, and the active fibrosis seemed to end. Vascularization was complete and the number of foreign body cells decreased to a stable amount. No evidence of significant degradation of PMMA in our specimens was found. With above findings, we think that PMMA microsphere is a stable and reliable implant for soft tissue augmentation.
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최한영,곽동렬 大韓成形外科學會 1998 Archives of Plastic Surgery Vol.25 No.7
There is more incidence of epicanthal fold in oriental and sometimes the epicanthal fold serves as an unacceptable appearence, so many seek cosmetic improvement in the medial canthal area to eliminate the epicanthal folds. Epicanthoplasty can give the aesthetic improvement by lenthening the palpebral fissure, thus producing the image of a larger and open-eye and especially it can enhance the aesthetic result of the double-lid procedure, but the epicanthal area is delicate and prone to produce a noticeable scar after epicanthoplasty, which is due to multiple incision and undue tension during the epicanthoplasty. We present a simple, tension free, and reproducible method of Z-epicanthoplasty based on our experience with 84 cases performed during the past 10 months in oriental eyelids. The advantages of this procedure are simplicity in design and minimal scaring produced in the medial canthal area without fear of hypertrophic scar as compared with complexed W-plasty, four flap, or Y-V plasty, which require multiple incision or undue tension and often creates unsightly scarring.
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이형식(Hyung Sik Lee),곽동렬(Dong Lyel Gawk),이상호(Sang Ho Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Numerical analysis has been carried out to investigate the flow and heat transfer characteristics in Zinc quenching systems for steel sheets. Zinc temperature has large influence on the quality of outputs. Modeling results are compared for various flow rates of air coolant considering the conjugate heat transfer in the main parts of systems. It is found that average temperatures of air coolant in outlets are 107 ℃ and 263 ℃ for volume flow rates of 600 ㎥/h and 4,080 ㎥/h respectively.
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