• Journal of Korean Academy of Oral and Maxillofacial Radiology
• /
• v.24 no.1
• /
• pp.31-35
• /
• 1994

전남대학교 치과진료처에 내원한 환자의 구내방사선사진중 1단계 (Cl: 30개 병소)또는 2단계(C2: 213.8병소)의 인접면 치아우식을 가진 방사선사진 168장을 연구대상으로 하였다. 이들 방사선사진은 코닥사의 Ektaspeed(E group) 필름을 사용하여 평행촬영법으로 촬영하였다. 168장의 방사선사진에 대하여 1단계 및 2단계 치아우식증을 4명의 구강악안면방사선학을 전공한 치과의사들이 같이 판독하여 그 결과를 기록하였다. 또한 168장의 방사선사진을 필름-비디오 변환장치를 이용하여 디지털 영상으로 전환하였다. 이때 486 DX PC에 PCVision과 frame grabber를 이용하였다. 각각의 구내방사선사 진영상은 17"크기의 1280×768픽셀의 해상도를 갖는 모니터상에서 256단계 흑화도를 갖는 700×480픽셀로 제시되었다. 모니터상에서의 치아우식 판독 결과를 구내방사선사진 판독 결과와 비교하였다. 그 결과 sensitivity는 0.98이었다. 1단계 치아우식은 0.87, 2단계 치아우식 은 1.00의 sensitivity를 나타내었다.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.28 no.1
• /
• pp.81-85
• /
• 2002

This paper describes that invasive aspergillosis was found in oral cavity, especially in lower molar periodontium in a immunocompromised 34-year-old woman who had been admitted in hemato-oncology with the diagnosis of acute myeloid leukemia. Antifungal therapy and surgical excision of involved teeth, bone and gingiva were the treatment of choice. After treatment infected area was healed very well. We would like to report our case because we could not find any paper reporting on invasive aspergillosis occurring in lower molar periodontium.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.28 no.1
• /
• pp.42-45
• /
• 2002

Cultures of primary human alveolar bone-derived cells were established from alveolar bone chips obtained from normal individuals undergoing tooth extraction. These cells were expanded in vitro until passage 3 and used for the in vivo assays. Cells were loaded into transplantation vehicles, and transplanted subcutaneously into immunodeficient mice to study the capacities of human alveolar bone-derived cells to form bone in vivo. Transplants were harvested 12 weeks after transplantation and evaluated histologically. Of 10 human alveolar bone-derived cell transplants, two formed a bone-like tissue that featured osteocytes and mineral. Eight of the ten formed no osseous tissue. These results show that cells from normal human alveolar bone are capable of forming bone-like tissue when transplanted into immunodeficient mice.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.26 no.5
• /
• pp.533-539
• /
• 2000

Recent development of dental implantology has taken an interest in the bone graft procedure. This is a review of literature, published from 1994 to November 1999. This study is provided by MEDLINE search. In this study, 718 patients received 829 graft with placing 2,677 endosseous implants. In mandible, nonvascularized or vascularized block bone grafts provided better results(success rate 95.2%) than particulate grafts(83.6%). But in maxilla, particulate grafts provided better results(93.7%, 86.2%) and more cases especially in sinus elevation. There were many cases using autogenous bone graft and revealed good results, but allogenic or alloplastic bone graft materials also were used by many surgeons.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.26 no.6
• /
• pp.681-683
• /
• 2000

The purpose of this study was to investigate the characteristics of mesiodens among children in Korea. The study population consisted of 20 children whose ages ranged from 4 years to 26 years. The characteristics of mesiodens were obtained from radiographs and clinical examination results, and were confirmed by surgical intervention. Results showed that males were affected four times as frequently as female. Thirty-five percent of the patients had more than one supernumerary tooth. About 67% of the mesiodens were conical in shape and about 34% of the mesiodens were in the upward position. The age and sex distribution, number of mesiodens per patient, shape, direction, size, and effect on permanent upper incisors are also presented in this study.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.26 no.6
• /
• pp.602-605
• /
• 2000

Human alveolar bone cells were isolated from alveolar bone fragments obtained from normal individual undergoing third molar extractions. Alveolar bone fragments were cultured as explant. Cells began to migrate in the first $5{\sim}7$ day and were confluent in $5{\sim}7$ week. Matrix mineralization was observed by 4 week. Our studies utilize established protocols for the characterization of these cells as osteoblasts by means of alkaline phosphatase activity determination, identification of osteocalcin antigens, establishing the presence of cells expressing type I collagen and determining the ability of cells to produce calcification. Transmission electron microscopic observations confirmed the presence of a collagen matrix undergoing a mineralization process. This new model, using human alveolar bone cells, may provide a tool to investigate alveolar bone development and physiology and to set up new therapeutic approaches.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.26 no.5
• /
• pp.540-543
• /
• 2000

The purpose of this retrospective study was to evaluate the treatment outcome of proximal tibial graft. Thirty-nine patients were grafted with proximal tibia for the repair of maxillofacial defect. Complications can be considered incidental and neglectable clinical significance. It is concluded that the proximal tibial metaphysis offers a promising alternative sources of cancellous bone for the repair of maxillofacial defect.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.26 no.4
• /
• pp.414-421
• /
• 2000

The objective evaluation of velopharyngeal closure function is the key to diagnosis and therapy control of velopharyngeal incompetency. The aim of this study is to evaluate the aerodynamic and acoustic characteristics of the velopharyngeal closure function of patients who have developed velopharyngeal incompetency after management with speech aids. The test words were composed of sustained vowels /a/, /i/, /e/, /u/, /ja/, /je/, /wi/ and polysyllabic words /p'ap'i/, /siso/, /mami/ for measuring nasalance, The data was collected before the placement of the speech aids and one to three months after. The results were as follows: The nasalance score of the velopharyngeal incompetency speakers was higher than that of the normal control group, except for nasal sounds, and was decreased after placement of the speech aids, especially in high vowels /i/ (P<.01) and /wi/ (P<.05).

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.29 no.2
• /
• pp.128-130
• /
• 2003

Pleomorphic adenoma is the most common intraoral salivary gland tumor and characteristically presents as slow painless growth. The cheek are rarely affected site of all pleomorphic adenoma arising from minor salivary glands. In this report, we present the case of a patient with pleomorphic adenoma that affects the cheek. The purpose of this paper is to report this case and review the features of the pleomorphic adenoma occuring in this site.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• v.27 no.6
• /
• pp.543-546
• /
• 2001

Primary intraosseous carcinoma(PIOC) is defined as a squamous cell carcinoma arising within the jaw, having no initial connection with the oral mucosa. The squamous cell carcinoma within the bone can be presumably developed from residues of the odontogenic epithelium, therefore, it is seen in the jaw only. Metastatic carcinoma from another primary site should be excluded in the diagnosis of Primary Intraosseous Carcinoma. This is a case of 62-year-old man, who initially diagnosed as odontogenic cyst on maxilla, but its pathologic examination was diagnosed as squamous cell carcinoma with odontogenic cyst. We treated this patient with partial maxillectomy, modified radical neck dissection(mRND), and postoperative radiation therapy.