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Tissue engineering of dental pulp on type 1 collagen
Lee, Gwang-Hee,Huh, Sung-Yoon,Park, Sang-Hyuk 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.4
The purpose of this study was to regenerate human dental pulp tissues similar to native pulp tis-sues. Using the mixture of type Ⅰ collagen solution, primary cells collected from the different tissues(pulp, gingiva, and skin) and NIH 3T3 (1 x 10^(5) cells/ml/well) were cultured at 12-well plate at 37℃ for 14 days. Standardized photographs were taken with digital camera during 14 days and the diameter of the contracted collagen gel matrix was measured and statistically analyzed with student t-test. As one of the pulp tissue engineering, normal human dental pulp tissue and collagen gel matrix cultured with dental pulp cells for 14 days were fixed and stained with Hematoxyline & Eosin. According to this study, the results were as follows : 1. The contraction of collagen gel matrix cultured with pulp cells for 14 days was significantly higher than other fibroblasts (gingiva, skin) (p < 0.05). 2. The diameter of collagen gel matrix cultured with pulp cells was reduced to 70.4% after 7 days, and 57. 1% after 14 days. 3. The collagen gel without any cells did not contract, whereas the collagen gel cultured with gingiva and skin showed mild contraction after 14 days (88.1% and 87.6% respectively). 4. The contraction of the collagen gel cultured with NIH 3T3 cells after 14 days was higher than those cultured with gingival and skin fibroblasts, but it was not statistically significant (72.1%, p> 0.05). 5. The collagen gel matrix cultured with pulp cells for 14 days showed similar shape with native pulp tissue without blood vessels. This approach may provide a means of engineering a variety of other oral tissue as well and these cell behaviors may provide information needed to establish pulp tissue engineering protocols.
Tissue engineering of dental pulp on type I collagen
Lee, Gwang-Hee,Huh, Sung-Yoon,Park, Sang-Hyuk The Korean Academy of Conservative Dentistry 2004 Restorative Dentistry & Endodontics Vol.29 No.4
The purpose of this study was to regenerate human dental pulp tissues similar to native pulp tissues. Using the mixture of type I collagen solution, primary cells collected from the different tissues (pulp, gingiva, and skin) and NIH 3T3 ($1{\;}{\times}{\;}10^5{\;}cells/ml/well$) were cultured at 12-well plate at $37^{\circ}C$ for 14 days. Standardized photographs were taken with digital camera during 14 days and the diameter of the contracted collagen gel matrix was measured and statistically analyzed with student t-test. As one of the pulp tissue engineering, normal human dental pulp tissue and collagen gel matrix cultured with dental pulp cells for 14 days were fixed and stained with Hematoxyline & Eosin. According to this study, the results were as follows: 1. The contraction of collagen gel matrix cultured with pulp cells for 14 days was significantly higher than other fibroblasts (gingiva, skin) (p < 0.05), 2. The diameter of collagen gel matrix cultured with pulp cells was reduced to 70.4% after 7 days, and 57.1% after 14 days. 3. The collagen gel without any cells did not contract, whereas the collagen gel cultured with gingiva and skin showed mild contraction after 14 days (88.1% and 87.6% respectively). 4. The contraction of the collagen gel cultured with NIH 3T3 cells after 14 days was higher than those cultured with gingival and skin fibroblasts, but it was not statistically significant (72.1%, p > 0.05). 5. The collagen gel matrix cultured with pulp cells for 14 days showed similar shape with native pulp tissue without blood vessels. This approach may provide a means of engineering a variety of other oral tissue as well and these cell behaviors may provide information needed to establish pulp tissue engineering protocols.
Finite Element Analysis of Combined Smeared and Discrete Mechanisms for Rock Salt
Yoon Il Ro,Huh Gwang Hee,Hwang Chung Yul 한국전산구조공학회 1995 한국전산구조공학회논문집 Vol.8 No.4
지하 방사성 폐기물 저장소의 오핸기간동안의 거동은 지반의 파괴와 변형에 영향과 암염의 비선형변형의 예 측은 어려운 실정이다. 따라서 본 연구는 암염의 비선형파괴 메커니즘과 비선형 연속체거동의 유한요소모 델 을 개발하였다. 까le long term behavior of the Waste Isolation Pilot Plant(WIPP). a nuclear waste repository cur rently under construction near Car!sbad at New Mexico, depends 때on the fracture and deformation behavior of bedded rock salt. Although many numerical analyses of the WIPP have been conducted, to our knowledge none have incJuded the ability to simultaneously predict the effects of fracture and nonlinear deformation of the salt continuum. We are in the process of developing a finite element program to simulate the effects of nonlinear fracture mechanics and nonlinear continuum behavior of rock salt simultaneously .
허용학(Yong-Hak Huh),김동일(Dong-Iel Kim),한준희(Jun-Hee Hahn),김광석(Gwang-Seok Kim),연순창(Soon-Chang Yeon),김용협(Yong-Hyub Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Tensile properties of hard coating material, TiN, were evaluated using micro-tensile testing system. TiN has been known as a hard coating material commonly used today. Micro-tensile testing system consisted of a micro tensile loading system and a micro-ESPI(Electronic Speckle Pattern Interferometry) system. Micro-tensile loading system had a maximum load capacity of 500mN and a resolution of 4.5 ㎚ in stroke. TiN thin film 1㎛ thick was deposited on the Si wafer pre-deposited of Si₃N₄ film substrate by the closed field unbalanced magnetron sputtering (CFUBMS) process. Three kinds of micro-tensile specimen with the respective width of 50㎛, 100㎛ and 500㎛ were fabricated by MEMS process. The mechanical properties including tensile strength and elastic modulus were determined using the micro-tensile testing system and compared by those obtained by nano-indentation
기저세포암의 모즈 미세도식 수술시 동결절편에서의 광학현미경 판독에 관한 연구
정성문(Sung Moon Jung),이민수(Min Soo Lee),김기호(Ki Ho Kim),허기영(Ki Young Huh),홍숙희(Sook Hee Hong),조광열(Gwang Yeol Joh) 대한피부과학회 1999 大韓皮膚科學會誌 Vol.37 No.10
N/A Background : Mohs micrographic surgery (MMS) achieves higher cure rates for cutaneous squamous cell and basal cell carcunomas than any other therapeutic modality. For a unifocal tumor, a 100% cure rate after MMS should theoretically be possible, however for primary basal cell carcinoma, 98-99% 5-year disease-free rates have been achieved. Objective : Our purpose was to investigate the pitfalls in microsscopic Interpretation of frozen sections in Mohs micrographic surgery for basal cell carcinoma which decrease the cure rate after surgery. Methods : From March 1991 to February 1998, fifty-nine patients were diagnosed with basal cell carcinoma at our department. All the tumors were removed with Mohs micrographic surgery and frozen section specimens were stained with hematoxylin-eosin. The microscopic evaluation was done by Mohs surgeon and pathologist. Results : We can summarize the matters that demand special attention during microscopic Interpretation of frozen sections in Mohs surgery as two groups. First, as false negative interpretation, there are 1) small nests of tumor scattered within areas of heavy inflammation 2) tumor present along the hair follicle, 3) tumor present along a cut edge, 4) empty space in a tissue section, 5) hair follicle-like structure of the tumor, 6) gland-like structure of the tumor, and 7) infiltrative BCC-like inflammatory cells. Second, as a false positive interpretation, there are 1) foreign body reactions or scar containing trapped pilosevaceous structures, 2) horizontal and tangential cuts through the pilosevaceous apparatus, 3) some epidermal neoplasms including solar lentigines, seborrheic leratoses, and acantholytic actinic keratoses, and 4) contamination of the tumor tissue. Conclusion : With careful attention to the examples which can affect the interpretation as mentioned above, it may be possible to detect complete removal of tumor mass and achieve higher cure rate. We could achieve a 100% of cure rate for primary basal cell carcinoma and 95% of cure rate for recurrent basal cell carcinoma after Mohs Micrigraphic surgery in our hospital from March 1991 to February 1998. (Korean J Dermatol 1999;37(10) : 1466∼1472)