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방사선치료와 화학요법을 받은 유방암 환자에서 발생한 발치 후 종창의 진단영상학적 감별 진단
허경회,안병모,김미자,박관수,허민석 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.3
A 60-year-old female, who complained of delayed healing and swelling after extraction of left lower second molar during chemotherapy, visited our department. She had a history of a resection surgery of breast cancer and postoperative radiotherapy. The conventional radiographs showed diffuse permeative bone destruction in posterior mandibular body, which gave the first radiologic impression of osteonecrosis associated with radiotherapy or chemotherapy. And bone metastasis from the breast cancer was also considered in the differential diagnosis. On the enhanced computed tomography (ECT) the posterior mandibular body was occupied by a large expansile lesion showing central low attenuation with peripheral rim enhancement. Magnetic resonance images revealed that the low attenuated area on ECT did not show as high signal intensity as water on T2 weighted image and indicated solid component of a tumor. The final diagnosis was central squamous cell carcinoma. We present the diagnostic imaging features of the patient with special emphasis on the differential diagnosis.
Fractal analysis of mandibular trabecular bone: optimal tile sizes for the tile counting method
허경회,백지선,이원진,허민석,이삼선,최순철,이선복,이승표 대한구강악안면방사선학회 2011 Imaging Science in Dentistry Vol.41 No.2
Purpose : This study was performed to determine the optimal tile size for the fractal dimension of the mandibular trabecular bone using a tile counting method. Materials and Methods : Digital intraoral radiographic images were obtained at the mandibular angle, molar, premolar, and incisor regions of 29 human dry mandibles. After preprocessing, the parameters representing morphometric characteristics of the trabecular bone were calculated. The fractal dimensions of the processed images were analyzed in various tile sizes by the tile counting method. Results : The optimal range of tile size was 0.132 mm to 0.396 mm for the fractal dimension using the tile counting method. The sizes were closely related to the morphometric parameters. Conclusion : The fractal dimension of mandibular trabecular bone, as calculated with the tile counting method, can be best characterized with a range of tile sizes from 0.132 to 0.396 mm.
허경회,정학현,황찬승,최종욱 대한비과학회 1994 Journal of rhinology Vol.1 No.1
Pneumococcal inoculation following the ostial obstruction is essential to induce the experi-mental sinusitis in the normal rabbits, but the ostial obstruction alone could not induce the experimental sinusitis because of technical difficulty to occlude the natural ostium completely through a middle meatus. Previous study reported that merocel was effective to occlude the natural ostium which resulted in experimental sinusitis in rabbits. The purpose of this study was to induce the experimental sinusitis by occluding the natural ostium with merocel and to evaluate the critical period of ostial obstruction for the sinuses were observed at various interval(i.e, at third day, first, second, third and fifth week) when merocels were removed and then 3 weeks induced the maxillary sinusitis which persisted after removal of merocel.
상악골 부분절제술 시행한 부분 무치악 환자에서 폐쇄 장치를 이용한 보철 수복 증례
허경회,임영준,김명주,권호범,Heo, Kyung-Hoi,Lim, Young-Jun,Kim, Myung-Joo,Kwon, Ho-Beom 대한치과보철학회 2016 대한치과보철학회지 Vol.54 No.2
상악골 부분 절제술을 시행한 환자들은 저작, 발음, 연하 기능에 문제가 발생하고 안모의 변화로 인해 사회적, 심리적인 어려움을 겪게 된다. 따라서 악안면 보철적 치료를 통한 기능적, 심미적 회복이 매우 중요하다. 적절한 폐쇄 장치는 구개의 외형을 회복시키고 구강과 비강, 상악동, 비인두를 분리시킴으로써 연하와 발음 기능을 회복시키는데 목적이 있다. 본 증례는 편평상피암으로 인해 우측 상악 구치부에서 비인두에 이르기까지 상악골 부분 절제술을 시행한 환자에서 폐쇄장치를 제작하였다. 이를 통해 발음 및 연하 기능을 회복하고 저작 기능의 향상을 도모하였으며 심미적인 부분에서 개선이 이루어졌다. 1년간의 임상적 관찰기간 동안 만족스러운 결과를 얻었기에 이를 보고하고자 한다. Patients undergone partial maxillectomy experience post-operative masticatory, phonetic, and swallowing difficulties. They also encounter social and psychological challenges due to changes in their facial appearances. Thus, functional and esthetic recovery through maxillofacial prosthesis becomes significant for these patients. The objective of an appropriate obturator is to restore palate and improve phonetic and swallowing ability by separating the oral cavity, nasal cavity, maxillary sinus, and nasopharynx. In this case report, an obturator was fabricated for a patient who had partial resection from the maxillary posterior region to the pharynx due to squamous cell carcinoma. The purpose of this case study is to describe the results because the patient was successfully improved both functionally and esthetically.
돼지 하악골의 micro-CT 영상에서 추출한 3차원 골미세구조와 골강도 사이의 상관관계
허경회,박무순,이원진,허민석,이삼선,최순철 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.3
Purpose : To investigate the relationship between three-dimensional (3D) bone imaging parameters and trabecular strength in the mandible. Materials and Methods : Bone specimens were obtained from the mandibles of five male pigs weighing around 110 kg each. Of those, 43 samples were selected for 3D analysis and measured by micro-computed tomography. The five morphometric parameters were trabecular thickness (Tb.Th), bone specific surface (BS/BV), percent bone volume (BV/TV), structure model index (SMI) and degree of anisotropy (DA). Through destructive mechanical testing, strength parameters were obtained. Results : BV/TV, SMI, BS/BV, and Tb.Th showed significant correlations with strength parameters. DA did not show any correlation with the other parameters. In multiple linear regression analysis, BV/TV alone explained 43% of the variance in Young’s modulus. By stepwise inclusion of SMI, the variance in the Young’s modulus was better explained up to 52%. Conclusions : Predicting trabecular strength in the mandible through architectural analysis would be possible. Further study is needed to establish the tendency and variety of trabecular architecture and strength according to the locations within the mandible.