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Progression of periapical cystic lesion after incomplete endodontic treatment
허종기,양동규,전국진,신수정 대한치과보존학회 2016 Restorative Dentistry & Endodontics Vol.41 No.2
We report a case of large radicular cyst progression related to endodontic origin to emphasize proper intervention and follow-up for endodontic pathosis. A 25 yr old man presented with an endodontically treated molar with radiolucency. He denied any intervention because of a lack of discomfort. Five years later, the patient returned. The previous periapical lesion had drastically enlarged and involved two adjacent teeth. Cystic lesion removal and apicoectomy were performed on the tooth. Histopathological analysis revealed that the lesion was an inflammatory radicular cyst. The patient did not report any discomfort except for moderate swelling 3 days after the surgical procedure. Although the patient had been asymptomatic, close follow-ups are critical to determine if any periapical lesions persist after root canal treatment.
허종기,신수정 대한치과보존학회 2013 Restorative Dentistry & Endodontics Vol.38 No.3
This case report demonstrates an unnecessary endodontic treatment of teeth with florid cemento-osseous dysplasia (FCOD) due to a misdiagnosis as periapical pathosis and emphasizes the importance of correct diagnosis to avoid unnecessary treatment. A 30-year-old woman was referred to our institution for apicoectomies of the mandibular left canine and both the lateral incisors. The periapical lesions associated with these teeth had failed to resolve after root canal treatment over a 3-year period. Radiographic examinations revealed multiple lesions on the right canine, the second premolar, and both first molars as well as the anterior region of the mandible. Based on clinical, radiographic and histological evaluations, the patient condition was diagnosed as FCOD. The patient has been monitored for 2 years. To avoid unnecessary invasive treatment, accurate diagnosis is essential before treatment is carried out in managing FCOD. (Restor Dent Endod 2013;38(3):160-166)
악관절 내장증 환자에서 자기공명영상 소견과 관절원판 후조직의 조직학적 소견과의 연관성
허종기(Jong Ki Huh),김형곤(Hyung Gon Kim) 대한구강악안면외과학회 2000 대한구강악안면외과학회지 Vol.26 No.4
Temporomandibular disorders arised from joint itself was caused by inflammation or mechanical irritation of the retrodiskal tissues. Histologic changes of the retrodiskal tissues of temporomandibular joint(TMJ) internal derangement, such as inflammatory cell infiltration, hyalinization, myxoid change, fatty change, arterial obliteration, and so on, were reported, but relationships between magnetic resonance imaging(MRI) findings and histologic findings of the retrodiskal tissue were few reported. The purpose of this study was to find histologic changes of the retrodiskal tissues for status of joint and joint effusion in MRI of the temporomandibular joint which had surgical treatment. Materials were surgically treated 52 temporomandibular joints with internal derangement or osteoarthritis in TMJ clinic, Yongdong Severance Hospital. All joints were confirmed by magnetic resonance T1- and T2-weighted imagings bofere surgery. Status of joint was categorized by normal position, disc displacement with reduction, disc displacement without reduction, disc displacement without reduction associated with osteoarthrosis using preoperative MR T1-weighted images. Magnetic resonance evidence of joint effusion was observed in T2-weighted images and classified by its amount; degree 0(not observed), degree 1(small amount), degree 2(moderate amount), degree 3(large amount). Histologic features were observed whether the retrodiskal tissue has inflammatory cell infiltration, myxoid change, hyalinization, chondroid metaplasia and arterial obliteration. The distribution of elastic fibers were also observed. The results were as follows; 1. Inflammatory cell infiltration was not observed in any retrodiskal tissues. 2. MRI findings such as status of joint and evidence of joint effusion did not have significant relationship with myxoid change, hyalinization, chondroid metaplasia, arterial obliteration of the retrodiskal tissues. 3. Hyalinization and chondroid metaplasia were found in 8 joints(15.4%) and 5 joints(9.6%). All of them were found in disc displacement without reduction and disc displacement without reduction associated with osteoarthrosis. 4. Arterial obliteration was observed more frequently in disc displacement without reduction(55.6%) than disc displacement without reduction associated with osteoarthrosis(28.6%). Further studies with proper controls and more materials will be necessary.
측두하악 관절원판 후조직의 MMP(matrix metalloproteinase)-1과 MMP-2 mRNA의 발현
허종기(Jong-Ki Huh),박광균(Kwang-Kyun Park),최민아(Min-Ah Choi),김형곤(Hyung-Gon Kim) 대한구강악안면외과학회 2003 대한구강악안면외과학회지 Vol.29 No.4
Matrix metalloproteinases (MMPs) play an important role in the normal morphogenesis, maintenance, and repair of matrix and also have important functions in pathologic conditions characterized by excessive degradation of extracellular matrix, such as rheumatoid arthritis, osteoarthritis, periodontitis and in tumor invasion and metastasis. In this study, expression of MMP-1 and -2 mRNA in retrodiscal tissue of the temporomandibular joint (TMJ) was examined and compared with magnetic resonance imaging (MRI) and surgical findings. MMP mRNAs in the retrodiscal tissue samples were detected by reverse transcription - polymerase chain reaction. TMJ internal derangement (ID) was categorized as normal disc position, disc displacement with reduction, early stage of disc displacement without reduction (DDsR) and late stage of DDsR. TMJ osteoarthrosis (OA) was classified with normal, mild and advanced OA. The amount of synovial fluid collection was divided into not detected, small, large and extremely large amount on MR T2-weighted imaging. Perforation and adhesion were examined during open surgery of the TMJ. Six out of 37 samples were excluded because of little amount of extracted total mRNA. MMP-2 mRNA was detected whole joints, and so the MMP-2 mRNA seems to be expressed normally in retrodiscal tissue. However, MMP-1 mRNA was expressed in 8 of 31 joints. Frequencies of MMP-1 mRNA expression according to the TMJ IDs, amount of synovial fluid and surgical findings made no significant difference. MMP-1 mRNA was detected more frequently in OA groups (7/16 joints, 43.8%) than in normal bony structure group (1/15 joints, 6.7%). Expression of MMP-1 mRNA in retrodiscal tissue might be related with OA of the TMJ.
허종기(Jongki Huh),표창우(Changwoo Pyo),정균락(Kyunrak Chong),원유헌(Yoohun Won) 한국정보과학회 1993 한국정보과학회 학술발표논문집 Vol.20 No.1
Chaitin의 그래프 컬러링을 이용한 레지스터 할당 알고리즘을 개선하여 레지스터 할당 시간을 단축하였고 대피(spill)코드의 발생 횟수를 줄였다. 이를 위해 레지스터 할당의 기본 단위인 생존 범위의 구체적이고 정확한 정의를 내렸다. 이를 바탕으로 대피 코드 발생 시 간섭그래프를 다시 작성하지 않도록 하였으며, 레이스터 할당과정이 한 차례의 그래프 축약을 통해 완료될 수 있게 하였다. 전역 레지스터 할당은 기억장소의 참조를 줄여 생성되는 기계어 코드의 실행 속도를 높여주는 기능으로서, 본 연구의 결과는 Chaitin의 알고리즘보다 컴파일 시간면에서, 그리고 생성되는 기계어 코드의 성능면에서 우수하다.
허종기(Jong-Ki Huh) 대한치과의사협회 2012 대한치과의사협회지 Vol.50 No.5
Temporomandibular joint (TMJ) prosthesis have been hesitated to use because of bitter memories about Proplast-Teflon interpositional TMJ implants. Many clinicians, however, are trying to use total TMJ prosthesis with getting continuous long-term follow-up results. Alloplastic total TMJ replacement have been applied to much more patients who have failed previous TMJ prostheses or TMJ implants, fibrous/bony ankylosis, severe osteoarthritis, degenerative joint disease, idiopathic condylar resorption, condyle loss by trauma or tumor resection, and other bony destructive diseases. Nowadays three types of total TMJ prosthesis are widely used. In this article, indications, types of prosthesis, safety and stability would be demonstrated with a case report.
조은애산드라,김재영,허종기,전국진,김현실 대한구강악안면병리학회 2015 대한구강악안면병리학회지 Vol.39 No.2
Epidermoid cyst of the oral and maxillofacial region is a soft tissue cyst lined with keratinized stratified squamous epithelium and most commonly arises in the superficial area of the mouth floor. Uncommonly, the epidermoid cyst may arise deeply in the submandibular region and should be differentially diagnosed with cystic salivary gland tumors, developmental cysts and other cystic lesions. We report a rare case of an epidermoid cyst near the submandibular gland, clinically and radiographically mistaken as a salivary gland tumor.
폐쇄성 수면무호흡증 진단을 위한 한국인 성인 부정교합자의 두부방사선 사진 계측 분석에 의한 연구
박광호,허종기,안제영,김지용,임재형 대한악안면성형재건외과학회 2005 Maxillofacial Plastic Reconstructive Surgery Vol.27 No.4
Obstructive sleep apnea syndrome (OSAS) is characterized by sleep-induced obstruction of the upper airway that results in cessation of airflow. Obstruction can occur at a number of points in the airway, but frequently in the oropharynx. A diagnostic evaluation includes cephalometry, computed tomography, magnetic resonance imaging, acoustic reflection technique, polysomnography and fibroptic endoscopy. Cephalometric measurements of the patients with obstructive sleep apnea have revealed that posterior airway anatomy has strong relations with the symptoms of them. A lateral cephalogram is routinely obtained in the radiologic evaluation of sleep apnea patients. The purpose of this study is to provide a the lateral cephalometric korean norms for the diagnosis and treatment of the patients with obstructive sleep apnea by analyzing the abnormal occlusion of Korean adults.