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정승곤,한순용,김동은,안병훈 대한이비인후과학회 2010 대한이비인후과학회지 두경부외과학 Vol.53 No.8
Schwannoma is a benign tumor originating from the peripheral nerve sheath that can arise on any myelinated nerve. A 32-year-old woman visited our clinic presenting with unilateral nasal obstruction. Based on the physical examination and CT scan, we initially diagnosed the disease as vascular origin tumor. Endoscopic excision was done after preoperative angiogram with embolization. Biopsy results revealed schwannoma originating from the nasal septum. Nasal septal schwannoma is extremely rare, and we herein report such a case with a review of literatures. Korean J Otorhinolaryngol-Head Neck Surg 2010;53:497-500
정승곤 한국종축개량협회 2000 젖소개량 Vol.2000 No.10
글 쓰기에 앞서 사실 필자는 미국의 선형심사교육을 받으러 갈 기회가 있어서 미국의 데어리 엑스포(Dairy EXPO)를 보았고 일본 홀스타인 공진회의 참가목적을 미국의 그것과 비교도 해 보면서 우리나라의 품평회를 어떻게 준비를 해볼 것인가? 가 방문의 주목적이었다. 따라서 농가에게는 다소 거리감 있는 요지의 느낌으로 받아 들여 질지 모르지만 품평회라는 것이 어느 기관의 행사가 아니라 전국 낙농 인들의 자발적인 축제의 행사라 여겨보고 느낀 점을 몇 자 적고자 합니다.
잠재적 전정기능 장애를 동반한 돌발성 난청 환자에서 전정기능검사의 역할
정승곤,박종원,한상윤,박순형,남성일 대한이비인후과학회 2013 대한이비인후과학회지 두경부외과학 Vol.56 No.11
Background and Objectives The evaluation of vestibular function is very important for patients with sudden sensorineural hearing loss (SNHL) as it is a well-known prognostic factor. The purpose of this study was to evaluate subclinical vestibular dysfunction (SVD) and its association with prognosis in sudden SNHL patients with and without dizziness using the vestibular function tests. Subjects and Method Seventy eight patients who had been diagnosed with unilateral sudden SNHL were examined by dividing them into three groups according to their clinical findings such as vestibular function and subjective symptoms: 1) normal, 2) SVD and 3) dizziness. Vestibular dysfunction and hearing recovery rates were also assessed. Results Patients with SVD accounted for 62.5% of patients even though they did not complain subjective dizziness. The extent of vestibular dysfunction in the dizziness group was greater than that in the SVD group (p=0.05). The hearing recovery rates for normal, SVD and dizziness group were 72% (13/18), 57% (17/30) and 48% (12/25), respectively. The incidence and extent of vestibular dysfunction was greater in patients with severe hearing loss than in those with moderate to severe loss. A significant correlation was noted between hearing recovery rate and vestibular evoked myogenic potential (VEMP) testing. Normal and abnormal VEMP data were associated with good and poor recovery (p=0.001). Conclusion The evaluation of vestibular function is important in sudden SNHL patients with dizziness; however, SVD also explains a significant proportion of sudden SNHL in the absence of dizziness. Notably, VEMP is useful tools for evaluating prognosis of sudden SNHL.
흰쥐 두개골 결손부에서 베타-트리칼슘 인산염과 탈단백우골의 골형성 효과
정승곤,박홍주,유선열,Jung, Seung-Gon,Park, Hong-Ju,Ryu, Sun-Youl 대한악안면성형재건외과학회 2010 Maxillofacial Plastic Reconstructive Surgery Vol.32 No.4
Purpose: This study was conducted to evaluate the effect of beta-tricalcium phosphate (Cerasorb$^{(R)}$, Germany) and deproteinized bovine bone (Bio-Oss$^{(R)}$, Switzerland) grafted to the defect of rat calvaria artificially created and the effect of use of absorbable membrane (BioMesh$^{(R)}$, Korea) on new bone formation. Materials and Methods: Transosseous circular calvarial defects with diameters of 5 mm were prepared in the both parietal bone of 30 rats. In the control group I, no specific treatment was done on the defects. In the control group II, the defects were covered with absorbable membrane. In the experimental group I, deproteinized bovine bone was grafted without absorbable membrane; in the experimental group II, deproteinized bovine bone was grafted with absorbable membrane; in the experimental group III, beta-tricalcium phosphate was grafted without absorbable membrane; in the experimental group IV, beta-tricalcium phosphate was grafted with absorbable membrane. The animals were sacrificed after 3 weeks and 6 weeks respectively, and histologic and histomorphometric evaluations were performed. Results: Compare to the control groups, the experimental groups showed more newly formed bone. Between the experimental groups, beta-tricalcium phosphate showed more resorption than deproteinized bovine bone. Stabilization of grafted material and interception of the soft tissue invasion was observed in the specimen treated with membrane. There was no statistical difference between the experimental group I, III and experimental group II, IV classified by graft material, but statistically significant increase in the amount of newly formed bone was observed in the experimental group I, II and II, IV classified by the use of membrane (P<0.05). Conclusion: Both beta-tricalcium phosphate and deproteinized bovine bone showed similar osteoconductibility, but beta-tricalcium phosphate is thought to be closer to ideal synthetic graft material because it showed higher resorption rate in vivo. Increased new bone formation can be expected in bone graft with use of membrane.
정승곤(Seunggon Jung) 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.10
Orbital fractures have a significant portion in facial bone trauma. The important thing in treatment of orbital fractures is variable depending on the patient. Reconstruction of orbital wall demands an understanding of the anatomy and function of the orbit, including the orbital tissues, and the approacheds, materials, and methods available.
e-PTFE의 산소 및 질소 플라즈마 표면처리에 따른 조골모세포의 증식효과
정승곤(Seunggon Jung),박홍주(Hong-Ju Park),오희균(Hee-Kyun Oh),문대선(Dae-Seon Moon),국민석(Min-Suk Kook) 대한치과재료학회 2015 대한치과재료학회지 Vol.42 No.1
e-Polytetrafluoroethylene (e-PTFE) is a commonly used medical polymer due to its biological stability and excellent mechanical properties such as high hardness and wear resistance. However, the superhydrophobic surface and lack of functional groups to interact with the cellular environment have severely limited its applications in bone or cartilage replacements. In this study, e-PTFE surface was modified by oxygen (O₂) or nitrogen (N2) RF plasma treatment in order to improving the hydrophilic property and preosteoblast cell proliferation. After the plasma treatment, e-PTFE surface was characterized by using a contact angle measurement, atomic force microscopy, and scanning electron microscopy. The contact angle of e-PTFE surface was significantly decreased and surface morphology did not changed. The MC3T3-E1 cell proliferation was evaluated by MTT assay. The N₂ or O₂ plasma- treated e-PTFE groups showed the higher cell proliferation than untreated group. In conclusion, the N₂ or O₂ gas plasma surface modification used in this study indicates the potential technique as a promising e-PTFE biomedical application.
전산화단층촬영상에서 하악후퇴수술 후 인두기도 공간의 변화
김방신,정승곤,한만승,정연욱,국민석,박홍주,오희균,유선열,Kim, Bang-Sin,Jung, Seung-Gon,Han, Man-Seung,Jeoung, Youn-Wook,Kook, Min-Suk,Park, Hong-Ju,Oh, Hee-Kyun,Ryu, Sun-Youl 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.1
Purpose: This study evaluated the pharyngeal airway space changes in CT images in patients receiving bilateral sagittal split osteotomy (BSSRO) for the surgical correction of mandibular prognathism. Methods: A total of 22 patients with mandibular prognathism were treated using BSSRO. Computed tomography was performed 1 month (T0) before surgery and, 1 month after surgery (T1). The anteroposterior length (AP), lateral width (LAT) and cross-sectional area (AREA) at the level of soft palate (C2) and base of the tongue (C3) were measured using CT images. Results: The mean amount of mandibular setback was 7.41 mm (${\pm}$3.46 mm). All the AP, LAT and AREA at the C2 and C3 level were decreased significantly 1 month after surgery (P<0.001). As the amount of mandibular setback was increased, the AP, LAT and AREA levels at the level of C2 and C3 had decreased. In addition, the reduction of the AREA at the C3 level was associated with the amount of mandibular setback (P<0.05). Conclusion: A significant decrease in pharyngeal airway space was observed 1 month after the operation. The cross-sectional area at the level of base of tongue was decreased with increasing amount of mandibular setback.