http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
치과용 부가중합형 실리콘 인장재에 대한 MgO-CaO-Al2O3-SiO2계 고강도 글라스 필러의 효과
강재경,이용근,김광만,김경남 대한치과재료학회 2005 대한치과재료학회지 Vol.32 No.2
The purpose of this study was to synthesize high strength glass in the system of 12.5MgO-17.5CaO-20Al2O3-50SiO2 and to evaluate its usefulness after its mixing with addition silicone base. The prepared glass filler was admixed as various contents of 35%(E1), 30%(E2), 25%(E3) and also silane-treated glass filler 25%(E4) in weight. Commercial products, Contrast(VOCO, Germany), Examix(GC, Japan), Express(3M/ESPE, USA), and Perfect-F(Handae Chem., Korea) were selected as control groups. Tear strength, consistency, strain in compression, recovery from deformation, detail reproduction and linear dimensional change were determined according to the standards of ISO 4823 and ASTM D624. They showed improved tear strength than those of commercial products. Consistency was satisfied the ISO standard in all groups except E1. The other tests were satisfied the ISO standard either all experimental groups or control groups. Therefore, the glass in the system of 12.5MgO-17.5CaO-20Al2O3-50SiO2 is expected as the useful filler in the light body of addition silicone impression materials because of its improved tear strength and low viscosity.
Non-Melanocytic Skin Cancers of the Head and Neck: A Clinical Study in Jeju Province
강재경,윤병민,송정국,신명수 대한성형외과학회 2017 Archives of Plastic Surgery Vol.44 No.4
Background Jeju Island is geographically and socioeconomically distinct from the mainland of South Korea. Thus, the presentation and management of non-melanocytic skin cancers (NMSC) of the head and neck may differ from those in other regions of the country. We compared the clinical characteristics and treatment modalities of NMSC on Jeju Island with the findings of similar regional studies. Methods Patient data, including age, sex, diagnosis, tumor site, treatment, and recurrence, were obtained from the medical and pathology records of patients diagnosed with NMSC between January 2010 and June 2015. Results In total, 190 patients (57 men) with a mean age of 75 years (range, 42–97) were assessed. Overall, 203 NMSCs were diagnosed, including 123 basal cell carcinomas and 80 squamous cell carcinomas. The tumor sites included the nose, cheeks, periorbital area, and lips (n=55, 54, 25, and 20, respectively). We identified 92 T1-stage and 60 T2-stage tumors, and 120 cases were treated with wide surgical resection and 17 cases were treated with radiation therapy at the medical center. Of the 120 cases treated surgically, 69 required reconstructive surgery using a local skin flap, 22 required full-thickness skin grafting, and 12 underwent primary closure. Basal and squamous cell carcinomas recurred in 2 and 1 cases, respectively. Conclusions Compared to the reports from other regions, the average patient age was 10 years higher, with a marked female preponderance. While the proportion of squamous cell carcinoma was higher than in other regions, the tumor distribution and surgical management profiles were similar.
강재경,박종철,이미희,권병주,김학희,심인경,정미라,이승진 한국고분자학회 2012 Macromolecular Research Vol.20 No.8
A major challenge in the use of electrospun scaffolds for tissue generation is that tightly packed layers of nanofibers can block cell infiltration into the scaffold, resulting in non-homogeneous cell distribution. This can cause incomplete extracellular matrix deposition and failure to generate tissue. In this study, we developed a cell seeding method that supports cell infiltration and distribution within a three-dimensional (3D) flexible and shape-controllable electropun scaffold. Cells were seeded on the scaffold layer-by-layer and cell growth rate 7 days post seeding was compared to cell growth after traditional cell seeding. Scanning electron microscopy demonstrated that the shape-controlled scaffold consist of microfibers with uniform thickness. In using the layer-by-layer seeding method, we observed that the cells were distributed uniformly throughout the 3D scaffold. In contrast, use of the traditional cell seeding method resulted in the cells remaining on the surface of the scaffold. These results suggest that a layer-by-layer cell seeding method can improve cell distribution within a 3D scaffold and effectively facilitate tissue formation.
강재경,송정국,정현교,신명수,윤병민,Kang, Jae Kyoung,Song, Jung-Kook,Jeong, Hyun Gyo,Shin, Myoung Soo,Yun, Byung Min 대한두개안면성형외과학회 2012 Archives of Craniofacial Surgery Vol.13 No.2
Purpose: To reconstruct the midface, local flaps such as nasolabial flaps have been frequently used. These local flaps, however, have the shortcomings of requiring a secondary operation or limitations in the movement of the flap. Thus, new methods have been developed. This paper reports a case wherein the basal cell carcinoma on the cheek was resected and the skin and soft tissue defect was successfully treated using a facial artery perforator flap. Methods: A 68-year-old female consulted the authors on the basal cell carcinoma that developed on her cheek. The mass was fully resected and revealed a $2.3{\times}2.3cm$ defective region. Using a Doppler ultrasonography, the facial artery path was traced, and using a loupe magnification, the facial artery perforator flap was elevated and the defective region was covered with the flap. Results: The flap developed early venous congestion, but it disappeared without any treatment. Six months after the surgery, the patient was satisfied with the postoperative result. Conclusion: The facial artery perforator flap has a thin pedicle. It offers a big arc of the rotation that allows free movement and one-stage operation. These strengths make the method useful for the reconstruction of the midface among other procedures.
친수성 Polyvinylsiloxane 인상재의 putty와 light body의 결합강도
강재경,김경남,조리라,정경호 대한치과기재학회 2000 대한치과재료학회지 Vol.27 No.4
Polyvinylsiloxane is the most accurate and dimensionally stable material among the dental impression materials which replicate the teeth and oral tissues. There are two methods for taking impressions with the polyvinylsiloxane: one step simultaneous polymerization; and putty/wash two step reline technique. The purpose of this study was to evaluate tensile bond strength between putty and wash material under the conditions of contamination with saliva or water at taking impression by putty/wash technique. The materials used in this study were 4 hydrophilic polvinylysiloxane impression materials of putty and light body type(Perfect-F, Handae Chemical, Korea; Contrast, VOCO, Germany; Exaflex and Examix, GC, Japan; Express and Imprint Ⅱ, 3M, U.S.A.). First, putty material filled in one perforated metal mold with diameter of 15 ㎜ and height of 19 ㎜ was set, and it was bonded with light body material filled in other paired metal mold before setting. Tensile bond strength was measured at a cross-head speed of 300 ㎜/min by universal testing machine (Instron 6022, Instron Co., U.K.) after 10 minutes from the joining two mold in order to set completely. As results, tensile bond strength of Contrast, Examix and Perfect-F showed no significant difference with control group on contamination with saliva or water, and it showed cohesive failure in the light body. However, Imprint Ⅱ showed the highest strength among these tested materials and showed adhesive failure at 5 specimens in the case of contamination with saliva and 4 specimens with water. From the results of this study, each product use possible cross bond and the tensile bond strength of some materials showed lower value on contamination with saliva.
강재경,윤병민,송정국,신명수 대한미용성형외과학회 2017 Archives of Aesthetic Plastic Surgery Vol.23 No.2
While various surgical methods are used for inverted nipple correction, an optimal technique has not been established. We describe a combination of suture methods including purse-string sutures, based on a report by Gould et al. This is a simple and safe method for inverted nipple correction.