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- 저자 : 곽병학(Byung-Hak Kwak) (검색결과 6 건)
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방사선 조사 백서 경골에 티타늄 임플랜트 매식후 골 치유에 관한 연구
곽병학(Byung-Hak Kwak),김종렬(Jong-Ryoul Kim),박봉수(Bong-Soo Park),신상훈(Sang-Hoon Shin),성일용(Iel-Yong Sung) 대한구강악안면외과학회 2003 대한구강악안면외과학회지 Vol.29 No.6
The present study was undertaken to evaluate bone regenerative capacity around titanium screw implants placed in irradiated rat’s tibiae. At one week after single 15-Gy dose irradiation, miniaturized titanium screw implants were inserted into anterior aspect of the upper tibia of rats weighing 200-250g. Seventy rats were involved: 35 rats were control and 35 rats radiation group. The rats were killed at different intervals as 1, 2, 3, 4, 6, 8, 12 weeks after implantation for histologic observation, histomorphometric analysis and immunohistochemical study with fibronectin and CD34 antibody. 1. Histologically, various stages of bone maturation and ossification can be seen at 4 weeks and regenerated bone close to edges demonstrates more advanced calcification, and network of new bone are well formed at 12 weeks in non-irradiated group. In contrast, active bone formation with increased contact of newly formed bone to implant surface was noted at 4 weeks and a significant amount of new bone formation and bone-implant contact is oberved at 12 weeks in irradiated group. 2. Histomorphometrical analysis confirmed these histologic findings. A significant difference in implant-bone contact and bone density was measured between the control and radiation group. Mean MBD was 62.2% in control group and 27.5% in radiation group, mean MBIC was 86.6% in control group and 47.7% in radiation group, and mean TBIC was 87.3% in control group and 45.6% in radiation group at 12 weeks after implantation. 3. In immunohistochemical study with fibronectin and CD34, radiation reduced hematopoietic progenitor cells severely and disturbed differentiation of osteoblast in bone marrow. The results of this study revealed bone healing capacity around implant after radiation therapy was severely impaired and irradiation reduces the capacity for osseointegration of titanium implants. Many factors including radiation dose, period between radiation and implantation, bone quality, time elapse between first and second surgery, type of prosthetics and hyperbaric oxygen therapy must be considered carefully in postradiation implantation.
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능동형 현가시스템을 위한 모드 SKY-HOOK 감쇠 제어기
곽병학(Byung Hak Kwak),박영진(Young Jin Park) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.4
Acitive suspension control for vehicles is developed to improve both ride comfort and steering stability which are in trade off relation. In this study, the modal sky-hook controller for 7 D.O.F. model is proposed to resolve the problems such as computaional power restriction and uncertainties in modeling of systems and environments. Modal sky-hook controller reduces the coupling between the modes to be controlled. The simulation result for ride comfort shows that the performance of the proposed controller matches that of the optimal controller. Systematic method of determining its gain is proposed. The modal sky-hook controller shows the robustness to road irregularity and modeling error.
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Jong Ryoul Kim(金鍾烈),Byung Hak Kwak(郭柄學),Byung Min Kim(金乘民),Chang Soon Byun(卞昶淳),Dong Kyu Yang(梁棟奎) 대한구강악안면외과학회 1992 대한구강악안면외과학회지 Vol.18 No.1
Disorders of the lacrimal drainage system are, at the least, very annoying to the patient and when serious infection is present may threaten vision and life. The definitive treatment for most lacrimal drainage system is surgical. Dacryocystorhinostomy (DCR), a procedure that fistulizes the lacrimal sac and nasal cavity, is the most frequency lacirmal drainage surgery. Indications for DCR include acquired nasolacrimal duct obstruction with patent canaliculi or this condition combined with a distal common canalicular obstruction, persistent nasolacrimal duct obstruction following probing and intubation, chronic dacryocystitis, and lacrimal sac foreign bodies. The only absolute contraindication is malignancy of the lacrimal sac, which is treated by dacryocystectomy. The patient, 55-year-old male, was admitted with the complaints of pus discharge from the medial commissure on the Rt. eye and oro-antral fistula on the Rt. maxillary sinus. In the past history, Caldwell-Luc operation was performed on the Rt. maxilla about 2 years before for the management of oroantral fistula. He was diagnosed as dacryocystitis with nasolacrimal duct obstruction and oro-antral fistula, and treated by dacryocystorhinostomy and Caldwell-Luc operation under general anesthesia. The postoperative course was unremarkable and the patient has been well for over 1 year postoperatively.
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김종렬(Jong Ryoul Kim),권우철(Woo Cheol Kwon),곽병학(Byung Hak Kwak) 대한구강악안면외과학회 1994 대한구강악안면외과학회지 Vol.20 No.2
When parotid duct or gland is lacerated and functional primary repair is not accomplished, three potential complications can occur : sialocele, extraoral salivary fistula and salivary cyst. Sialocele is subcutaneous cavity of saliva which is extravasated from traumatized duct or gland. When the primary injury causing the sialocele is an injured duct, three basic methods of treatment are possible. Basically, the salivary flow must be directed intraorally as extraoral pressure is applied to the region of subcutaneous saliva extravasation, preventing an extraoral fistula. Concomitant daily aspirations of the sialocele may be required. If a sialocele occurs, one should fist attempt the insertion of a catheter via Stensen s duct into the region of the sialocele to direct drainage intraorally, aspirate the sialocele as necessary, and apply an external pressure dressing. If this fails, reexploration and anastomosis of the duct should be attempted. If anastomosis of the duct proves impossible, the proximal duct should be ligated with several silk sutures. The following case illustrates the effective treatment of sialocele by these methods. A 50-year-old man was sent to our department for evaluation of right preauricular swelling. He had deep facial laceration after automobile accident. One week after primary closure, 3.0cm×3.0cm×2.0cm-sized flucturant mass developed. At aspiration, clear yellowish serous water was seen. Sialogram showed accumulation of contrast media at right parotid gland and remnant of contrast media at excretory duct which represents pocket formation. We attempted duct exploation and excision of sialocele. A pressure elastic bandage was applied for 15 days after operation. He had no further complication nor recur after that treatment.
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