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The study of fractural behavior of repaired composite
박상순,남욱,엄아향,김덕수,최기운,최경규 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.6
Objectives: This study evaluated microtensile bond strength () and short-rod fracture toughness to explain fractural behavior of repaired composite restorations according to different surface treatments. Materials and Methods: Thirty composite blocks for test and sixty short-rod specimens for fracture toughness test were fabricated and were allocated to 3 groups according to the combination of surface treatment (none-treated, sand blasting, bur roughening). Each group was repaired immediately and 2 weeks later. Twenty-four hours later from repair, and fracture toughness test were conducted. Mean values analyzed with two-way ANOVA / Tukey's B test (= 0.05) and correlation analysis was done between and fracture toughness. FE-SEM was employed on fractured surface to examine the crack propagation. Results: The fresh composite resin showed higher than the aged composite resin (p < 0.001). Mechanically treated groups showed higher bond strength than non-mechanically treated groups except none-treated fresh group in (p < 0.05). The fracture toughness value of mechanically treated surface was higher than that of non-mechanically treated surface (p < 0.05). There was no correlation between fracture toughness and microtensile bond strength values. Specimens having high KIC showed toughening mechanism including crack deviation, microcracks and crack bridging in FE-SEM. Conclusions: Surface treatment by mechanical interlock is more important for effective composite repair, and the fracture toughness test could be used as an appropriate tool to examine the fractural behavior of the repaired composite with microtensile bond strength. 연구목적: 본 연구는 미세인장결합강도와 파괴인성을 통해 복합 레진 수복물의 수리 시기와 표면 처리 방법에 따른 파괴 거동을 알아보고자 시행되었다. 연구 재료 및 방법: Short rod 시편과 composite resin specimen block을 준비하여 표면 처리 방법에 따라 none-treated, sand blasting, bur roughening 군으로 나누고 이를 다시 즉시군과 2주 지연군으로 나누어 수리했다. 결과: 미세인장결합강도와 파괴인성을 측정한 결과, 두 실험 모두에서 즉시군이 지연군보다 높은 값을 보였다. 기계적 표면 처리군이 none-treated군보다 높은 값을 보였고, sand blasting과 bur roughening 사이에 유의한 차이는 없었다. 파괴인성과 미세인장결합강도는 상관 관계가 없었다. FE-SEM을 보아 수복물의 탈락은 균열 전도와 관계가 있는 것으로 보인다. 결론: 수리된 복합 레진의 파괴 거동 평가에는 파괴인성 실험이 적합하다.
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Poly(butylene glutarate-co-adipate-co-succinate-co-terephthalate) 공중합체의 서열분포 및 열적성질
박상순,조윤,강혜정,Park, Sang Soon,Cho, Yoon,Kang, Hye Jung 대한화학회 1999 대한화학회지 Vol.43 No.6
The quaternary random copolyesters of poly (butylene glutarate-co-adipate-co-succinate-co-terephthalate)(PBGAST) were synthesized and charaterized by $^1H-NMR$ spectrometry, DSC method, and X-ray diffractometry. Thus the melting point trends and crystallization behaviors of PBGAST copolyesters were obviously depended on terephthalate content in copolymers as well as reaction condition.
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고분자 기포제를 이용한 경량 기포 콘크리트의 역학적 특성 (II)
박상순,송하원,변근주 한국콘크리트학회 1997 콘크리트학회지 Vol.9 No.1
The objective of this study is to obtain the mechanical characteristics of prefoarmed lightweight foamed concrete using the polymer ham agent which has high lightness. flowability and strength. For this purpose, the prefoarmed lightweight foamed concrete which was developed to have flow value over 180mm. unit weight between 0.38t/$m^3$ and 0.64t/$m^3$, and compressive strength about 30kg/$cm^2$ was used. This paper presents extensive test data on Young's modulus. Poisson's ratio, stress-strain curve, the characteristics of strength of the foamed concrete and also presents the mechanical characteristics of the foamed concrete with different foam sizes. It is expected that this study provides an importance guide to design and manufacture lightweight foam concrete, so that it helps to expand its structural use.
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역혈류성 전외측대퇴 혈관경피판을 이용한 무릎 주위 결손의 재건
박상순,심정수,Park, Sang-Soon,Shim, Jeong-Su 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.6
Purpose: As the soft tissue defect around the knee is difficult to reconstruct, local flap or free flap is used. Distally based anterolateral thigh pedicled flap introduced by Zhang uses sufficient reverse flow supplied from the vascular network around the knee. We report successful reconstruction of defect around knee by this method. Methods: Four patients with skin & soft tissue defect around knee have been treated for reconstruction using the distally based anterolateral thigh pedicled flap. First, the doppler was used to check the perforator flap of the descending branch of the lateral circumflex femoral artery and to draw and dissect the perforator flap as much as needed. After the dissection, the proximal of the descending branch was clamped and checked for sufficient supply of blood flow from the reverse flow and then ligated. It was dissected along the descending branch and in order to prevent damage to the joined parts of the descending branch and the lateral superior geniculate artery, a more careful ligation was done starting from 10 cm superior to the knee. The defect was reconstructed after securing enough vascular pedicle to cover all the damaged parts. Results: Not all patients suffered from flap necrosis. In case of the patient with chronic osteomyelitis, slight venous congestion was observed right after the surgery but it disappeared the following day. All three patients had no occurences of additional complications. Conclusion: Distally based anterolateral thigh pedicled flap was enough to provide large flap for knee reconstruction. It had sufficient blood flow and vascular pedicle. It also had taken short operation time compared to the free flap operation. The distally based anterolateral thigh pedicled flap used by the authors is a very useful way of reconstructing the area around knee.
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Steinmann 씨 고정편의 흉강내 이동 - 1례 보고 -
박상순,강신광,구관우,나명훈,유재현,임승평,이영,Park, Sang-Soon,Kang, Shin-Kwang,Ku, Kwan-Woo,Na, Myung-Hoon,Yu, Jae-Hyen,Lim, Seung-Pyung,Lee, Young 대한흉부심장혈관외과학회 2001 Journal of Chest Surgery Vol.34 No.6
충남대학교 의과 대학 흉부외과학 교실에서 상박 외과경 골절 고정에 이용한 Steinmann씨 핀이 흉강내로 이동한 환자 1예를 치험 하였다. 핀 하나는 흉벽에 약간의 유착을 형성하여,흉벽에 위치했고 하나는 흉곽출구에서 흉강 내로 관통하고 있었다. 우측방 개흉으로 어려움 없이 제거하고 환자는 수술 10일에 경쾌 퇴원하였다.
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