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권민상,김정근,배기범,권재환,조중환 대한이비인후과학회 2007 대한이비인후과학회지 두경부외과학 Vol.50 No.2
Background and Objectives:Enophthalmos is a comon sequelae of orbital fracture. Moreover, it is difficult to treat second-arily. We assessed the effect of filling up the orbital volume defect with implants on the correction of late posttraumatic enoph-thalmos. Subjects and Method:because of late postraumatic enophthalmos from July 2001 to December 2005. To corect late posttraumatic enophthalmos, porous polyethylene (Medpor), Medporenophthalmos wedge implant, absorbable mesh, bone graft particulate, rib cartilage, auricle cartilage, and maxilla anterior wall were used. Results:Among 11 patients, 6 patients were men and 5 patients were women. The average age was 33.2 years with the follow-up period of 21.8 months. Five patients had orbital floor fracture, 1 3 patients had zygoma fracture. Excellent results were obtained in all 5 patients with diplopia. The amount of enophthalmos corrected was between 1 and 5 mm (mean 2.5 mm). There was no case of visual loss, infection, migration, or exposure of implant, but we caried out re-operation on 1 case due to over reduction. Conclusion:Filling up the volume defect with proper implants is a relatively simple, safe and efficient technique in corecting late posttraumatic enophthalmos. (Korean J Otolaryngol 2007;50:128-33)
권민상,문정환,권재환,조중환 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.3
Frontal sinus fractures are relatively uncommon maxillofacial injuries, making up only 5% to 12% of al facial fractures. Management of the fracture depends on the type and severity of the fracture and the presence of associated injuries. The use of a metalic plate as a reduction material for facial bone fracture has vastly grown;however, in infants, metal implants induce growth restriction of facial bone and the plate needs to be removed after approximately 3- 6 months. Due to these weaknes, the use of it as a bioabsorbable plate has thus taken over the large proportion of all its uses. A 15-year-old man was admitted to our hospital with a depression fracture of the frontal sinus anterior wall after trauma to the frontal area. Seven days after ed bony fragments back in original place, the bioabsorbable plates were fixed on them. Postoperatively, depressed frontal area was restored normaly. There is no evidence of complication after 28 months from the operation. We report a successful reduction of the frontal sinus anterior wall fracture using bioabsorbable plates.
중거리급 탐색레이더 복합재 하우징의 T-joint 영역 구조 강도 평가
권민상,Kwon, Min-Sang 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.4
This article provides strength estimation of T-joint area which made of composite material. Inner and outer structures of medium range surveillance radar are all made of sandwich structure which is made with composite material(CFRP) and aluminum honeycomb core. Since the radar is voluminous and has very complex inner structure, the whole structure cannot be made as one piece. Therefore, usage of T-joints is inevitable. Since some of stress concentration areas were located around T-joint area, series of strength estimations were conducted. Three different configurations were tested to improve mechanical properties(primarily on strength). The results show an improvement on strength to meet calculated strength on stress concentrated T-joint area.
안와 외향골절 정복술에서 치료성적 및 술후 합병증 분석
권민상,문정환,김정근,권재환,조중환 대한이비인후과학회 2006 대한이비인후과학회지 두경부외과학 Vol.49 No.8
Background and Objectives:There has been a recent surge in the frequency of blowout fracture operations in the Departmentof Otorhinolaryngology. Clinical symptoms and signs, operative timing and the results from fracture site and size have been researchedin this study. We conducted this study to examine the postoperative complications causing re-operation in orbital blowoutfracture repair in the last seven years. Subjects and Method:Based on patients’ clinical data, we retrospectively reviewed160 patients who had operation because of blowout fracture from January 1998 to December 2004. Fifty-two patients had orbitalfloor, 74 patients had medial orbital wall, 34 patients had a combination of orbital floor and medial orbital wall fractures. We investigateddiplopia, limitation of eye movements, and enophthalmos after the surgery, and analyzed the frequency and causes ofre-operation. The mean postoperative follow-up was 24 months. Results:We classified complications into immediate complicationswhich occurred within 24 hours, late complications which occurred between 24 hours and 2 weeks, and delayed complicationswhich occurred 2 weeks or more after operation. The symptoms of complications included diplopia, EOM limitation,cheek hypoesthesia, loss of vision, oroantral fistula, implant infection, ectropion, and etc. In case of sequelae which lasted morethan six months, the combination of orbital floor and medial orbital wall fractures was higher than other fracture types. We carriedout re-operation on 14 cases and the main cause was incomplete reduction. Conclusion:Surgeons should perform properoperation according to fracture site and type, and insert the implant after making an adequate dissection in order to reduce thefrequency of complication and re-operation. (Korean J Otolaryngol 2006;49:802-6)