• Journal of Periodontal and Implant Science
• /
• 제28권4호
• /
• pp.559-568
• /
• 1998

direct bone apposition during bone remodelling. To address these problem, we developed a new ceramic, calcium metaphosphate(CMP), and report herein the biologic response to CMP in subcutaneous tissue, muscle and bone. Porous CMP blocks were prepared by condensation of anhydrous $Ca(H_2PO_4)_2$ to form non-crystalline $Ca(PO_3)_2$. Macroporous scaffolds were made using a polyurethane sponge method. CMP block possesses a macroporous structure with approximate pore size range of 0.3-1mm. CMP blocks were implanted in 8mm sized calvarial defect, subcutaneous tissue and muscle of 6 Newzealand White rabbits and histologic observation were performed at 4 and 6 weeks later. CMP blocks in subcutaneous tissue and muscle were well adapted without any adverse tissue reaction and resorbed slowly and spontaneously. Histologic observation of calvarial defect at 4 and 6 weeks revealed that CMP matrix were mingled with and directly apposed to new bone without any intervention of fibrous connective tissue. CMP blocks didn't show any adverse tissue reaction and resorbed spontaneously also in calvarial defect. This result revealed that CMP had a high affinity for bone and was very biocompatible. From this preliminary result, it was suggested that CMP was a promising ceramic as a bone substitute and tissue engineering scaffold for bone formation.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제28권4호
• /
• pp.274-279
• /
• 2002

The purpose of this study is to evaluate the critical maintenance period of absorbable membrane for guided bone regeneration. Fortynine Sprague-Dawley rats weighing about 300g were divided into seven groups. An 8 mm circular full-thickness defect in calvarial bone was made and then cellular acetate porous filter (Millipore $filter^{(R)}$.) was placed on the calvarial bone defect. The filter was removed at 2, 3, 4, 5, 6, 8 and 11 weeks after placement. Rats were sacrificed at 12 weeks the placement of cellular acetate porous filter. The specimens were stained with Hematoxylin-Eosin and observed under light microscope. The amount of regenerated bone was measured from both margin of calvarial bone defect (unit : mm). The results were as follows. Bone regeneration of each experimental group was increased gradually and the bond defect was almost completely filled with new bone in 5-, 6-, 8-, and 11-week experimental group. Histologic findings showed mild inflammatory response and granulation tissue formation without apparent adverse effects on the healing process. In 11-week experimental group, the bone defect was completely filled with new bone containing abundant osteoid which was oriented to the dural side and contribute to bony thickening. We suggest that non-absorbable membrane and bioabsorbable membrane presumably should remain intact for longer than 5 weeks to be effective.

• Tuberculosis and Respiratory Diseases
• /
• 제66권1호
• /
• pp.20-26
• /
• 2009

연구배경: 양전자방출 단층촬영은 최근 폐암의 진단과 병기 결정에 널리 사용된다. 본 연구에서는 비소세포폐암 환자에서 양전자방출 단층촬영에서의 골수 대사활성도의 증가가 항암화학요법에 대한 반응과 관련성이 있는지 알아보고자 하였다. 방 법: 조직학적으로 비소세포폐암으로 진단 받은 환자 중에 양전자 방출 단층촬영을 시행한 후 일차 항암화학 요법을 시행 받은 환자를 대상으로 하였다. 대상군의 양전자 방출 단층촬영상 골수 대사활성도는 요추 1, 2, 3번의 FDG 섭취를 측정하여 평가하였고, 항암화학요법에 대한 반응은 Response Evaluation Criteria in Solid Tumors (RECIST)를 이용하여 평가하였다. 결 과: 총 59명의 환자가 포함되었다. 대상군을 양전자 방출 단층촬영상 골수의 SUV가 1.37 이상인 군(21명, 35.6%)과 미만인 군(38명, 64.4%)으로 나누었고, 골수의 SUV와 간의 SUV의 비가 0.73 이상인 군(22명, 37.3%)과 미만인 군(37명, 62.7%)로 나누어 일차 항암화학요법에 대한 반응을 비교하였다. 골수의 SUV와 골수의 SUV와 간의 SUV의 비는 일차 항암화학요법에 대한 반응과 통계학적으로 유의한 차이가 없었다(p=0.142, 0.978). 결 론: 비소세포폐암 환자에서 양전자방출 단층촬영에서 나타난 골수 대사활성도는 항암화학요법에 대한 반응과 관련성이 없었다.

• 한국전산구조공학회:학술대회논문집
• /
• 한국전산구조공학회 2004년도 봄 학술발표회 논문집
• /
• pp.143-150
• /
• 2004

An optimum design problem for endosseous implant in dentistry is studied to find best implant design. An optimum design problem is formulated to reduce stresses arising at the cortical as well as cancellous bones, in which sufficient design parameters are chosen for design definition that encompasses major implants in popular use. Optimization at once (OAO) with the large number of design variables, however, causes too costly solution or even failure to converge. A concept of multilevel optimization (MLO) is employed to this end, which is to group the design variables of similar nature, solve the sub-problem of smaller size for each group in sequence, and this is iterated until convergence. Each sub-problem is solved based on the response surface method (RSM) due to its efficiency for small sized problem.

• 한국대기환경학회지
• /
• 제5권1호
• /
• pp.62-67
• /
• 1989

The clastogenic effects of the diesel emission particle extract (DEPE), mercuric chloride and lead acetate were examined by the mouse bone marrow micronucleus test. DEPE had a potent clastogenic effect by intraperitoneal injection with dose-response between 100 and 300mg/kg b.w.. Mercuric chloride and lead acetate also gave a clastogenic effects but mercuric chloride only had a dose-response between 1 and 3mg/kg b.w.. When DEPE was administrated with mercuric chloride or lead acetate, the frequency of micronucleated cells was slight but not significant increase in comparision to a single treatment with DEPE alone.

• Journal of Microbiology and Biotechnology
• /
• 제24권2호
• /
• pp.188-196
• /
• 2014

Extracellular production of recombinant human bone morphogenetic protein-7 (rhBMP-7) was carried out through the fermentation of Bacillus subtilis. Three significant fermentation conditions and medium components were selected and optimized to enhance the rhBMP-7 production by using the response surface methodology (RSM). The optimum values of the three variables for the maximum extracellular production of rhBMP-7 were found to be 2.93 g/l starch, 5.18 g/l lactose, and a fermentation time of 34.57 h. The statistical optimization model was validated with a few fermentations of B. subtilis in shake flasks under optimized and unoptimized conditions. A 3-L jar fermenter using the shake-flask optimized conditions resulted in a higher production (413 pg/ml of culture medium) of rhBMP-7 than in a shake flask (289.1 pg/ml), which could be attributed to the pH being controlled at 6.0 and constant agitation of 400 rpm with aeration of 1 vvm.

• 대한치과교정학회지
• /
• 제11권2호
• /
• pp.65-70
• /
• 1981

In the present study orthodontic force was applied to the molars of control group and experimental group treated with the lathyrogen beta-aminopropionitrile (BAPN). Observation resulted in the following conclusions : 1) New alveolar bone formation in response to orthodontic force in BAPN-treated rats exceeded corresponding bone formation in control of cup when measured at two tension sites in the periodontal ligament. 2) BAPN administration produced disorganization of the collagenous fibers of the periodontium of experimental group. Multiple eosinophilic cell-free areas were found distributed throughout the radicular portions of affected periodontal ligaments. 3) The areas of periodontium surrounding orthodontically treated teeth exhibited relatively normal organization under these conditions, while the periodontium of adjacent nonorthodontically treated teeth was disorganized. 4) The present results suggest that the typical histologic response to orthodontic force application can occur in the presence of a chemically and physically altered periodontium.

• Nuclear Medicine and Molecular Imaging
• /
• 제42권sup1호
• /
• pp.76-90
• /
• 2008

$^{18}F-FDG$ PET in combination with conventional imaging modalities could help avoid unnecessary biopsy for the primary mass, and it also has a high diagnostic accuracy in patients with dense breasts. In the assessment of metastasis, $^{18}F-FDG$ PET was useful to select patients who required sentinel lymph node biopsy and to detect extra-axillary lymph node metastasis and distant metastasis. To increase the sensitivity for osteoblastic bone metastasis, bone scintigraphy should be added. In the detection of recurrence, $^{18}F-FDG$ PET showed a higher diagnostic accuracy than tumor marker or computed tomography, and therefore it can be used in routine breast cancer follow-up. $^{18}F-FDG$ PET has been reported that it correctly predicted the response of neoadjuvant chemotherapy on as early as 8th day of treatment. Therefore, it is useful for the early detect of therapeutic response in advanced breast cancer.

• 대한치과의사협회지
• /
• 제32권4호통권299호
• /
• pp.285-297
• /
• 1994

• 대한약학회:학술대회논문집
• /
• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
• /
• pp.201-201
• /
• 2003

The effect of radio- and chemotherapy for cancer are excellent, but their toxicities to normal tissue and organ of the body is relatively strong, which leads secondary side effect to patients during therapies. Particularly, due to the response for bone marrow suppression such as agranulocytosis limits the therapy periods and dose of drugs, new drug development that reproduces lymphocytes has been focused. (omitted)