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구강 악안면 영역의 생체 흡수성 고정판 사용에 관한 임상 연구
김일규,박승훈,장금수,양정은,장재원,사시카라 바라라만,Kim, Il-Kyu,Park, Seung-Hoon,Jang, Keum-Soo,Yang, Jung-Eun,Jang, Jae-Won,Sasikala, Balaraman 대한구강악안면외과학회 2009 대한구강악안면외과학회지 Vol.35 No.6
Metallic bone plates and screws have been commonly used in oral and maxillofacial surgery for internal fixation. However, there are several disadvantages such as atrophy of cortical bone inherent to excessive rigid fixation systems, growth disturbance in growing individual, allergy reaction, interference with radiographic imaging, palpability, thermal sensitibity and the need for subsequent removal. To overcome these disadvantages and avoid additional surgery of removal of plates and screws, there have been many studies of biodegradable plates and screws. But, It also has complication such as foreign body reactions. We have undertaken a clinical and retrospective study on 140 patients in Dept. of Oral and Maxillofacial Surgery, Inha University Hospital from February 2006 to March 2009. The purpose of this study is to report the clinical cases and review of the literatures with biodegradable plates and screws. And we concluded following results. 1. 6 cases(3.4%) of the 177 operation sites(140 patients) experienced complications. 1 case(0.6%) was a failure of initial fixation, 1 case(0.6%) was a postoperative infection, 4 cases(2.3%) were inflammations or foreign body reaction. 2. Postoperative infections, inflammations and foreign body reactions were completely recovered with incision and drainage, supporative care with antibiotic coverage and removal of biodegradable plates. 3. Biodegradable plates and screws provide acceptable rigidity and stability clinically. But, long-term observation is required for the tissue reactions around the biodegradable plates and screws because of long resorption periods of the biodegradable materials.
임프란트 나사형태와 치조골 흡수에 따른 응력분산의 3차원 유한요소법적 분석
김일규,손충렬,장금수,조현영,백민규,박승훈,Kim, Il-Kyu,Son, Choong-Yul,Jang, Keum-Soo,Cho, Hyun-Young,Baek, Min-Kyu,Park, Sheung-Hoon 대한악안면성형재건외과학회 2008 Maxillofacial Plastic Reconstructive Surgery Vol.30 No.1
The objective of this study is to evaluate the stress distribution according to the thread design and the marginal bone loss of a single unit dental implant under the axial and offset-axial loading by three dimensional finite element analysis. The implants used had the diameter of 5mm and 4mm with 13mm in length and prosthesis with a conical type which is 6mm in height and 12mm in diameter. The thread designs were triangular, square and buttress. In the three dimensional finite element model with $15\times15\times20mm$ hexahedron and 2mm cortical thickness, implants were placed with crown to root ratio 7:12, 10:9, 13:6 and 16:3. And additionally the axial force of 100N were applied into 0mm, 2mm and 4mm away from the center of the implants. The results were as follows 1. The maximum von-Mises stress in cortical bone was concentrated to cervical area of implant, and in cancellous bone, apical portion. 2. Comparing the von-Mises stresses in cortical bone of 2mm and 4mm offset loading with central axial loading, it were increased to 3 and 5 times in diameter 4mm implant, and 2 and 4 times, in diameter 5mm implant. 3. The square threads were more effective than the triangular and butress as the longer diameter, the offset loading, and the worse crown to root ratio. 4. The von-Mises stresses were relatively stable until crown to root ratio 13:6, but it was suddenly increased at 16:3. From the results of this study, minimum requirement of crown to root ratio of implant is 2:1, and in the respect of crown to root ratio, diameter and offset loading, square threads are more effective than triangular and buttress threads.
김병화(Kim, Byeong Hwa),김수진(Kim, Soo Jin),여금수(Yeo, Keum Soo),장정범(Jang, Jung-Bum),이홍표(Lee, Hong-Pyo) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
The changes in the dynamic properties of the prestressed concrete beams with grouted tendon have been experimentally investigated. Three prestressed concrete beams with different stress levels are considered. The various axial vibration tests are conducted. The changes in the axial responses of the beams with respect to the applied tensile force on the tendon has been examined. It seems that the axial vibration modes are a feasible indicator for the identification of tensile force of the grouted tendon.
김병화 ( Kim Byeong Hwa ),김수진 ( Kim Soo Jin ),여금수 ( Yeo Keum Soo ),장정범 ( Jang Jung-bum ),이홍표 ( Lee Hong-pyo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The changes in the dynamic properties of the prestressed concrete beams with grouted tendon have been experimentally investigated. Three prestressed concrete beams with different stress levels are considered. The various axial vibration tests are conducted. The changes in the axial responses of the beams with respect to the applied tensile force on the tendon has been examined. It seems that the axial vibration modes are a feasible indicator for the identification of tensile force of the grouted tendon.
두 개의 임플란트를 이용한 3본 고정성 국소의치에서 가공치 위치에 따른 하악골에서의 응력 분포 및 변형에 관한 삼차원 유한요소법적 연구
김동수(Dong-Su Kim),김일규(Il-Kyu Kim),장금수(Keum-Soo Jang),박태환(Tae-Hwan Park),김규남(Kyu-Nam Kim),손충렬(Choong-Yul Son) 대한구강악안면외과학회 2009 대한구강악안면외과학회지 Vol.34 No.2
Excessive concentration of stress which is occurred in occlusion around the implant in case of the implant supported fixed partial denture has been known to be the main cause of the crestal bone destruction. Therefore, it is essential to evaluate the stress analysis on supporting tissue to get higher success rates of implant. The purpose of this study was to evaluate the effects of stress distribution and deformation in 3 different types of three-unit fixed partial denture supported by two implants, using a three dimensional finite element analysis in a three dimensional model of a whole mandible. A mechanical model of an edentulous mandible was generated from 3D scan, assuming two implants were placed in the left premolars area. According to the position of pontic, the experiments groups were divided into three types. Type I had a pontic in the middle position between two implants, type II in the anterior position, and type III in the posterior position. A 100-N axial load was applied to sites such as the central fossa of anterior and posterior implant abutment, central fossa of pontic, the connector of pontic or the connector between two implants, the mandibular boundary conditions were modeled considering the real geometry of its four-masticatory muscular supporting system. The results obtained from this study were as follows; 1. The mandible deformed in a way that the condyles converged medially in all types under muscular actions. In comparison with types, the deformations in the type II and type III were greater by 2-2.5 times than in the type I regardless of the loading location. 2. The values of von Mises stresses in cortical and cancellous bone were relatively stable in all types, but slightly increased as the loading position was changed more posteriorly. 3. In comparison with type I, the values of von Mises stress in the implant increased by 73% in Type II and by 77% in Type III when the load was applied anterior and posterior respectively, but when the load was applied to the middle, the values were similar in all types. 4. When the load was applied to the centric fossa of pontic, the values of von Mises stress were nearly 30-35% higher in the type III than type I or II in the cortical and cancellous bone. Also, in the implant, the values of von Mises stress of the type II or III were 160 -170% higher than in the type I. 5. When the load was applied to the centric fossa of implant abutment, the values of von Mises stress in the cortical and cancellous bone were relatively 20-25% higher in the type III than in the other types, but in the implant they were 40-45% higher in the type I or II than in the type III. According to the results of this study, musculature modeling is important to the finite element analysis for stress distribution and deformation as the muscular action causes stress concentration. And the type I model is the most stable from a view of biomechanics. Type II is also a clinically acceptable design when the implant is stiff sufficiently and mandibular deformation is considered. Considering the high values of von Mises stress in the cortical bone, type III is not thought as an useful design
김일규(Il-Kyu Kim),김주록(Ju-Rok Kim),장금수(Keum-Soo Jang),전원(Won Jeon) 대한구강악안면외과학회 2007 대한구강악안면외과학회지 Vol.33 No.6
Orbital infection or inflammation is a rare but serious complication of an odontogenic infection. Odontogenic infection can spread to the orbit by one or more of several paths. Such extension is potentially dangerous and can lead to loss of vision or worse. 5-cases of orbital infection and inflammation secondary to infection from upper or lower molar teeth, which extended to the subperiosteal or the retrobulbar region of the orbit, are presented in this report. The infections spreaded to the infratemporal and temporal fossa or the ethmoidal labyrinth, and then to the orbit via the inferior orbital fissure or the lamina papyracea. The clinical presentation, differential diagnosis, route of spread, value of serial CT scanning, treatment and possible complications are reviewed.
김일규(Il-Kyu Kim),류문광(Mun-Kwang Ryu),구제훈(Je-Hoon Ku),장금수(Keum-Soo Jang),김주록(Ju-Rok Kim),곽현종(Hyun-Jong Kawk),최진웅(Jin-Ung Choi) 대한구강악안면외과학회 2006 대한구강악안면외과학회지 Vol.32 No.2
Brain abscess is a rare, extremely aggressive, life-threatening infection. It may occur following : infection of contiguous structure, hematogenous spread, or cranial trauma/ surgery. Dental pathology and/or treatment have been linked to a small number of brain abscesses as possible source of infection. 50-year-old male patient was presented with a brain abscess caused by Streptococcus viridans. In the case presented, the significant oral findings were chronic periapical and periodontal infection due to root remnant of lower right 3rd molar. A case history and brief literature review of brain abscess related odontogenic infection was presented after successful treatment with antibiotics and craniotomy.