• Journal of the Ergonomics Society of Korea
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• v.27 no.2
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• pp.83-89
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• 2008

Study was developed the metallic plate for fixation in the femur fracture and plates has a firm place in fracture treatment. This plates can be stabilized for fracture fixation as well as biological and dynamical device. The device's designation and sizing has a optimization with bending structural stiffness and strength, known meaning that is reliable regardless of the plate by the short type and long type. The bending strength of the curved metallic long plate has to evaluate a 11,000N and the bending strength of the curved metallic short plate has to evaluate a 6,525N. This see the X-ray image of bending angle made certain of 15$^{\circ}$ at number 2 and same 82.87$^{\circ}$ at number 2, 4, 5, 7, 8, 9, 10 by outside angle, and confirmed 25.26$^{\circ}$ at number 3, 3.68$^{\circ}$ at number 6, 15.64$^{\circ}$ at number 9 by inside angle. This study shows that keep up the metallic plate for fixation in the femur fracture through X-ray Image and the device can be used to support Revision case of Hip Implant and to use a case of Hip screw compression of Hip Neck Fracture. Short plate have a wrapping of femur and long plate have to preserve a pole of femur.

• The Journal of Korean Academy of Prosthodontics
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• v.55 no.3
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• pp.331-335
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• 2017

An immediate complete denture is considered as restoration for lost natural teeth, which is fabricated following the extraction of the remaining teeth. Current esthetics and function can be retained by using immediate denture without edentulous period. However, the major disadvantages of immediate denture relate to the difficulties associated with taking accurate definitive impression and predicting the results of immediate denture. In this case report, the Campagna tray technique was used to take the final impression in a 49-year-old male patient presented with all remaining teeth diagnosed as hopeless teeth. Surgical templates were used for alveoloplasty after extraction. The immediate complete dentures were then delivered. The clinical assessments of immediate dentures showed good esthetic and functional outcomes. The patient showed high level of satisfaction.

• Journal of the Korean Society for Precision Engineering
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• v.27 no.1
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• pp.134-141
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• 2010

This study analyzed the regional morphological and mechanical characteristics of vertebrae by using micro-computed tomography (micro-CT) and micro finite element analysis (FEA). For the present study, the $12^{th}$ human thoracic vertebral bones (an 85-years female and a 48-years male) were used. These were scanned by using micro-CT. Structural parameters were evaluated from the acquired 20 image data for fifteen $4{\times}4mm^2$ regions (five regions in respective layers of superior, middle and inferior part) in the thoracic vertebral trabecular bones. $4{\times}4{\times}4mm^3$ cubic finite element models of each regions were created at $70{\mu}m$ voxel resolution to investigate effective modulus ($E^+$). The present study indicated that there were significant differences in morphological and elastic mechanical characteristics of each region. There are close relationship between effective modulus and structural model index (SMI) in the bone of the 48-years male and between effective modulus and bone volume fraction (BV/TV) in the bone of the 85-years female. In addition, the effective modulus of central regions is about 80% stiffer than that of lateral regions at transverse plane. These findings may be likely to explain the previous result that a change of loading distribution of the vertebral trabecular bones is caused by spinal curvature and nucleus pulpous degeneration of the intervertebral disc.

• The korean journal of orthodontics
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• v.29 no.6 s.77
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• pp.699-706
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• 1999

Anchorage plays an important role in orthodontic treatment. Endosseous implants may be considered adequate firm anchorage. However, clinicians have hesitated to use endosseous implants as orthodontic anchorage because of limited implantation space, high cost, and long waiting period before osseointegration occurs. Recently, some clinicians have tried to use titanium miniscrews and microscrews in treatment due to their many advantages such as ease of insertion and removal, low cost, immediate loading, and the ability to place microscrews in any area of alveolar bone. The author treated a case with skeletal cortical anchorage using titanium microscrew implants. During six months of orthodontic force application from skeletal cortical anchorage, the author could get 4 mm bodily retraction and intrusion of upper anterior teeth. The most outstanding result was a 1.5 mm posterior refraction of the upper posterior teeth. The titanium microscrew implants had remained firm and stable throughout treatment. These results indicate that skeletal cortical anchorage might be a very good option.

• Journal of the Korean Society for Nondestructive Testing
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• v.22 no.4
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• pp.377-385
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• 2002

Ultrasonic tests employing non-ionizing radiation are preferred in nondestructive examinations since they are safe and simple in use. The same principles of the techniques have been taken as valuable tools in medical area for the diagnoses of diseases, in other words, defects of the human body. The paper overviews the principles of the medical diagnosis based on nondestructive ultrasonic tests, and then evaluates experimentally the clinical potential of C scan images not popular in medicine, for detecting the micro fractures of the cortical bone. In the experiment the micro bone fractures were created on the femurs of porks by loading three point bending forces (2-4kN) with the speed of 1 mm/min. As the extent of the fracture was altered, not only X ray images but also ultrasonic C scan images using a focused ultrasonic probe resonated at 25 MHz were obtained. The results showed that ultrasonic C scan images were capable of detecting the micro bone fractures which were not possible to identify by conventional X ray images.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.892-895
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• 2005

This study investigated changes of mechanical characteristics in the trabecular and cortical bone of the lumbar vertebrae of the ovariectomised(OVX) rat. In previous researches, there were many studies for morphology of osteoporotic bones based on Micro-CT (Micro - Computed Tomography). However, there were few studies for detecting and tracking changes of mechanical characteristics in the trabecular bone and cortical bone of the lumbar vertebrae for the OVX rat. For this study, one female Sprague-Dawley rat was used: an OVX rat. The 4th lumbar of the OVX rat was utilized as a specimen. Detecting and tracking changes of mechanical characteristics could be investigated in the trabecular and cortical bone of the lumbar vertebrae for an OVX rat using In-vivo Micro-CT. An OVX rat was scanned at week 0 (just before surgery), at week 4, and week 8 after surgery. Micro finite element(${\mu}\;FE$) analysis was used to investigate mechanical characteristics in the trabecular and cortical bone of the lumbar vertebrae for an OVX rat.

• The Journal of the Korean bone and joint tumor society
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• v.1 no.1
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• pp.52-59
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• 1995

Metastatic cancer is the most common tumor of the skeleton. The prevalence of pathologic fracture may increase as patient survival is prolonged by improved cancer therapy. With recent advances in orthopaedic procedure and medical management of terminal cancer patients, it is generally agreed that aggressive treatment should be undertaken for patient with pathologic fracture secondary to metastatic disease, and a team approach should be utilized. The authors have reviewed twenty cases of pathologic fracture of the long bone due to metastatic tumor treated in the Department of Orthopedic Surgery, Yonsei University College of Medicine, from April 1989 to April 1994 and the following results were obtained. 1. The mean age at surgery was 58.4 years (ranged from 24years to 86years) and among 20 cases, 10 cases were male and the others were female. 2. The most frequent site of pathologic fracture in long bone is femur(15 cases, 75%), and followed by humerus(4 cases, 20%), tibia(1 case). 3. The frequently encountered primary tumors that metastases to long bone are those of the lung(7 cases, 35%), breast(4 cases, 20%), and prostate(2 cases, 10%). 4. The operative procedure was performed by resection of the tumor mass extensively, and we used polymethylmetacrylate for filling the dead space after resection, in all cases. 5. The mean survival period after operation is 9.2 months(ranged from 1 month to 4 years and 9 month). 6. The results of postoperative pain relief status were graded as fair to excellent in 17 cases(85%).

• Journal of Korean Medical classics
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• v.19 no.3
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• pp.47-64
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• 2006

籬위제고화가심대청대정골추나요법적인식화이해(爲提高和加深對淸代正骨推拿寮法的認識和理解), 특선어차방면의의교심차유의사문환가치적(特選於此方面意義較深且有醫史文歡價値的) ${\ulcorner}$의종금감(醫宗金鑑) 정골심법요지(正骨心法要旨)${\lrcorner}$ 중적(中的) ${\ulcorner}$외치법(外治法)${\lrcorner}$ 진행료연구(進行了硏究), 획득여하연구결과(獲得如下硏究結果). 기수법총론부분(其手法總論部分), 파요지규정료정골수법적정의급기중요성(擺要地規定了正骨手法的定義及其重要性), 후유증적예방(後遺症的預防), 안환자원기강약이수요주의적사항(按患者元氣强弱而需要注意的事項), 정골의생적기본공화심이소질등문제(正骨醫生的基本功和心理素質等問題). 기정골수법부분(其正骨手法部分), 포괄모(包括模) 접(接) 단(端) 제(提) 접(按) 나(摩) 추(推) 나등팔법(拿等八法), 각법지적응증용현대용어해석여하(各法之適應症用現代用語解釋如下): 모법용어촉진(模法用於觸診), 접법용어골절치료(接法用於骨折治療), 단법용어탈위치료(端法用於脫位治療), 제법용어견인법(提法用於牽引法), 안마법용어연조직손상화골착건적치료(按摩法用於軟組織損傷和骨錯鍵的治療), 추나법용어절적운동(推拿法用於節的運動) 부리화관절적부완전결합적치료(不利和關節的不完全結合的治療). 기기구총론부분(其器具總論部分), 개소료십종정골치료용기구(介紹了十種正骨治療用器具), 각종기구적적응증급기효능용현대용어해석여하(各種器具的適應症及其效能用現代用語解釋如下): 이렴구유보호환부적효과(裏簾具有保護患部的效果), 진정용어동통(振挺用於疼痛) 부종(浮鍾) 경결적치료(硬結的治療), 피견용어견관절탈구적고정료법(被肩用於肩關節脫臼的固定療法), 격색속어리용자아체중적견인료법(擊索屬於利用自我體重的牽引療法), 루관속어분부동계단이용자아체중진행견인적료법(壘觀屬於分不同階段利用自我體重進行牽引的療法), 통목속어포추지압축성골절적래목치료용구(通木屬於胞推之壓縮性骨折的來木治療用具), 요주구유대요추골급기근육이상적부가보호대효과(腰柱具有對腰推骨及其筋肉異常的附加保護帶效果), 죽렴용어골절적고정치료(竹簾用於骨折的固定治療), 삼리구유대골절적쌍중고정효과(杉籬具有對骨折的雙重固定效果), 포슬구유대슬관절적고정효과(抱膝具有對膝關節的固定效果).

• The Journal of the Korean bone and joint tumor society
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• v.4 no.2
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• pp.81-87
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• 1998

Although autoclaved autogenous bone reconstruction is one of the established procedures, it may have some problems in bone regeneration and mechanical property. The purpose of this study is to evaluate the efficacy of more biologic and anatomical reconstruction where allograft is not readily available. From Aug.1991 to Feb. 1996 the authors analyzed 32 cases of reconstruction with autogenous low heat treated bone. Autogenous graft sites were humerus 4, tibia 4, pelvis 9, and 15 femur. Average follow-up period was 23(range;12-51) months. There were 49 graft-host junctional sites. Diaphysis was 22, metaphysis 10, and flat bone 17. Average duration of healing for the 38 united sites was 7 months. Average union time for each anatomical area 8 months in 19 diaphysis, 12 months in 7 metaphysis, and 12.7 months in 12 flat bone(pelvis). Eleven nonunion sites consisted of 3 diaphysis(3/22), 3 metaphysis(3/10), and 5 flat bone(5/17). Complications other than nonunion were local recurrence(4), bone resorption(3), graft fracture(2), osteomyelitis(1), metal failure(2), and wound infection(1). Initial bone quality and stable fixation technique was important for union rate. Plate and screw is a good method for diaphyseal lesion. Metaphyseal and flat bone are weak area for rigid fixation and one stage augmentation with iliac bone graft can be a salvage procedure.

• The Journal of Pediatrics of Korean Medicine
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• v.19 no.2
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• pp.165-174
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• 2005

Objectives : The purpose of this study was to suggest a new method for measurement of children's growth development Ultrasound transonic velocity of inferior radiocarpal joint has some advantages that it is harmless to human body and apply a new analysis algorithm, it can be used for the diagnosis of bone age. Methods: This clinical study have been carried out with the 117 case(male 68, female 49) of the children aged 5 to 16 years old who visited in Department of Pediatrics, ${\bigcirc}{\bigcirc}$ university Oriental Hospital. Bone maturity is measured by Ultrasound transonic velocity and X-ray image of growth plate in inferior radiocarpal joint. This study were designed to investigate the relationship of the bone age by Ultrasound transonic velocity and X-ray image. Result & Conclusion : The maturity of growth plate of inferior radiocarpal joint was correlated with age, height, weight, BMI in this study(P<0.001). The Ultrasound transonic velocity of inferior radiocarpal joint are sufficient diagnostic worth as an index to predict bone maturity.