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최신기술동향 - 산화물 TFT를 이용한 플렉시블 디스플레이
유민기,Yu, Min-Gi 한국광학기기산업협회 2012 光學世界 Vol.139 No.-
플렉시블 디스플레이는 기존의 딱딱한 디스플레이와는 달리 휘고 구부리고 심지어 돌돌 말 수 있는 디스플레이이다. 산화물 반도체TFT의 연구는 비교적 짧은 시간동안 많은 연구자들에 의하여 집중적인 연구가 진행이 되어 소자특성이 비약적으로 향상이 되었다.
구강암 환자에서 18F FDG-PET/CT의 경부 림프절 전이 평가 유용성
유민기(Min-gi Yu),유선열(Sun-Youl Ryu) 대한구강악안면외과학회 2009 대한구강악안면외과학회지 Vol.35 No.4
Purpose: The present study was aimed to examine the usefulness of 18F-FDG PET/CT in the evaluation of cervical lymph node metastasis in patients with oral cancer. Materials and methods: Twenty-two patients who underwent neck dissection to treat oral cancer were subjected for examination. The cervical node metastasis was evaluated by means of clinical examination, CT scan, PET, and histologic examination. By comparing the results of each examination modality with those of histologic examination, it s sensitivity, specificity, positive predictive value, and negative predictive value were determined. Results: The oral cancer was more frequent in males with a ratio of 2.14:1. The sixth decade showed the highest incidence in age distribution with mean of 56±16. Histologic findings showed that squamous cell carcinoma was the most common (15 patients), and mucoepidermoid carcinoma (3), malignant melanoma (2), and adenoid cystic carcinoma and ghost cell odontogenic carcinoma (1 each), in order. In most cases, wide surgical excision of the primary cancer and neck dissection was performed, followed by reconstruction with free flaps when necessary. When comparing the results of each examination modality with those of the histologic examination, clinical examination showed sensitivity, specificity, positive predictive value, and negative predictive value at 11%, 85%, 33%, and 58%, respectively. CT scans showed at 67%, 77%, 67%, and 77%, while 18F-FDG PET/CT at 78%, 77%, 70%, and 83%, respectively. Conclusions: These results suggest that PET is more useful, compared with clinical examination and CT scans, in the evaluation of cervical lymph node metastasis in patients with oral cancer.
하악과두에서 발생한 악성 골육종 환자에서 외과적 절제 후 유리장골이식을 이용한 재건
박홍주,유민기,국민석,오희균,Park, Hong-Ju,Yu, Min-Gi,Kook, Min-Suk,Oh, Hee-Kyun 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.4
하악골에서 고분화 골육종은 매우 드물게 보고되고 있으며 조직검사상 전형적인 골육종과는 달리 다형성(pleomorphism)을 보이지 않기 때문에 양성종양으로 오진(under-diagnosis) 되기 쉽다. 그러나 정확한 환자의 진단은 적절한 치료와 환자의 예후에 영향을 큰 영향을 미친다. 그러므로 조기에 정확한 진단을 위하여는 의심되는 여러 부위에서 조직검사를 시행하고 임상소견과 방사선소견 등을 병리의사와 공유하여야 한다. 이에 초기에 진단이 어려웠던 하악골에 발생된 고분화 골육종을 경험하여 환자의 사회적 기능적 회복을 위한 수술을 시행하여 바람직한 결과를 얻었기에 문헌고찰과 함께 보고하는 바이다. Osteosarcoma of the jaw is a rare malignant bone tumor which usually leads to a poor prognosis. It commonly occurs in young patients, especially in male. The tumor can involve mandible or maxilla with same frequency. The swelling in the involved area and facial deformity are common clinical findings. The pain and sensory changes are also complained by the patients. Although radical surgery plays an important role in the management of this tumor, the adjuvant chemotherapy or radiotherapy is used to enhance local control and to prevent distant metastases. We treated a 22-year-old male patient who had osteosarcoma in the left condylar region. The radical surgery which consisted of hemimandibulectomy and total parotidectomy, was done and an immediate mandibular reconstruction was performed with a vascularized free iliac osteomuscular flap. The obtained results, both esthetic and functional, were satisfactory. The patient was received postoperative chemotherapy. This is a case with reviews of the literatures.
측방접근법을 이용한 상악동거상술 후 임프란트 식립에 대한 후향적 평가
기세일,유민기,김영준,국민석,박홍주,오희균,Ki, Se-Il,Yu, Min-Gi,Kim, Young-Joon,Kook, Min-Suk,Park, Hong-Ju,Shet, Uttom Kumar,Oh, Hee-Kyun 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.5
Purpose: The aim of this study was to evaluate the clinical results of implants which were installed with maxillary sinus elevation by using lateral window technique. Materials and methods: We performed the maxillary sinus elevation by lateral window technique to 87 patients who visited Dept. of Oral & Maxillofacial Surgery, Chonnam National University Hospital from January, 2003 to January, 2007. When the residual bone height was from 3 mm to 7 mm, the sinus elevation and simultaneous implant installation was mostly performed. When the residual bone height was less than 3 mm, the sinus elevation was performed and the delayed implant installation was done after 5 or 6 months. No artificial membranes were used for coverage of the lateral bony window site and freeze dried fibrin sealant was applied to the grafted bone. The mean follow-up period was 28.5 months (ranged from 10 months to 48 months) Results: 1. Unilateral sinus elevations were performed in 51 patients and bilateral sinus elevations were performed in 36 patients. And the total number of sinus elevation procedure was 123 cases. 2. The sinus elevation and simultaneous implant installation was performed in 89 sinuses and 249 implants were installed. The sinus elevation and delayed implant installation was performed in 44 sinuses and 141 implants were installed. The total number of implants were 390 in 133 sinuses. The average healing period after sinus elevations was 6.1 months in delayed implant installation. 3. Only autogenous bone, autogenous bone mixing with allografts or autogenous bone mixing with xenografts were used as graft materials. 4. The average period from first surgery to second surgery was about 7.2 months. 5. Some patients complications, such as perforation of sinus membrane, swelling, infection and exposure of cover screw. Two implants were removed in the infected sinus. 6. The survival rate of implants with maxillary sinus elevation by lateral window technique was 99.5% and the success rate of implants was 95.1%. Conclusions: These results indicated that the implants which were installed with maxillary sinus elevation by lateral window technique showed high survival and success rates.
가토의 두개골에서 티타늄 반구를 이용한 다양한 onlay bone graft시 골형성 능력
박영준,최근호,장정록,정승곤,한만승,유민기,국민석,박홍주,유선열,오희균,Park, Young-Jun,Choi, Guen-Ho,Jang, Jung-Rok,Jung, Seung-Gon,Han, Man-Seung,Yu, Min-Gi,Kook, Min-Suk,Park, Hong-Ju,Ryu, Sun-Youl,Oh, Hee-Kyun 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.6
육안적 검사결과 실험군과 대조군 모두에서 특별한 염증 소견이나 창상 이개 없이 반원 모양의 골형성이 관찰되었다. 조직학적으로 3주째에 대조군, 실험 1군, 실험2군, 실험 3군 모두 이식골 주위 및 티타늄 반구 내면을 따라 신생 골형성이 관찰되었다. 조직학적으로 6주째에 모든 군에서 3주째에 비하여 신생골 면적의 증가 및 성숙 소견이 관찰되었고, 실험2군에서는 부분적으로 이식골이 흡수되면서 신생골이 형성되는 것이 관찰된 반면, 실험 3군에서는 이식골의 흡수 소견이 관찰되지 않았다. 조직형태계측학적으로 3주, 6주 모두 자가골에서 가장 많은 신생골 형성이 나타났고, 신생골 면적 비교시 자가골, 이종골, 합성골 순으로 크게 나타났고, 각 군간의 통계학적으로 유의한 차이는 없었다(p>0.05). 본 연구결과 골유도 재생술시 골형성 능력은 자가골이 가장 좋지만, 자가골 채취가 불가능할 경우, 적절한 차폐막을 사용한 합성골과 이종골 복합 이식방식도 좋은 대체제가 될 것으로 생각된다. Purpose: This study was performed to evaluate the effect of various graft materials used with a titanium cap on the ability of new bone formation in the rabbit calvarium. Materials and Methods: A total of 32 sites of artificial bony defects were prepared on the calvaria of sixteen rabbits by using a trephine bur 8 mm in diameter. Each rabbit had two defect sites. 0.2 mm deep grooves were formed on the calvaria of sixteen rabbits by using a trephine bur 8 mm in diameter for the fixation of a titanium cap. The treatments were performed respectively as follows: without any graft for the control group (n=8), autogenous iliac bone graft for experimental group 1 (n=8), alloplastic bone graft ($SynthoGraft^{(R)}$, USA) for experimental group 2 (n=8), and xenogenic bone graft ($NuOss^{(R)}$, USA) for experimental group 3 (n=8). After the treatments, a titanium cap (8 mm in diameter, 4 mm high, and 0.2 mm thick) was fixed into the groove. At the third and sixth postoperative weeks, rabbits in each group were sacrificed for histological analysis. Results: 1. In gross examination, the surgical sites showed no signs of inflammation or wound dehiscence, and semicircular-shaped bone remodeling was shown both in the experimental and control groups. 2. In histological analysis, the control group at the third week showed bone remodeling along the inner surface of the cap and at the contact region of the calvarium without any specific infiltration of inflammation tissue. Also, there was no soft tissue infiltration. Bone remodeling was observed around the grafted bone and along the inner surface of the titanium cap in experimental group 1, 2, and 3. 3. Histologically, all groups at the sixth week showed the increased area of bone remodeling and maturation compared to those at the third week. In experimental group 2, the grafted bone was partially absorbed by multi nucleated giant cells and new bone was formed by osteoblasts. In group 3, however, resorption of the grafted bone was not observed. 4. Autogenous bone at the third and sixth week showed the most powerful ability of new bone formation. The size of newly formed bone was in decreasing order by autogenous, alloplastic, and heterogenous bone graft. There was no statistically significant difference among autogenous, alloplastic, and heterogenous bones(p>0.05). Summary: This result suggests that autogenous bone is the best choice for new bone formation, but when autogenous bone graft is in limited availability, alloplastic and xenogenic bone graft also can be an alternative bone graft material to use with a suitably guided membrane.