분사처리 후 산부식 표면처리된 교정용 미니 임플랜트의 골유착능에 관한 연구

전미선,강윤구,모성서,이근혜,국윤아,김성훈 대한치과교정학회 2008 대한치과교정학회지 Vol.38 No.5

본 연구에서는 교정 치료 시 골내 고정원으로 사용되는 교정용 임플랜트의 표면처리 여부가 골유착능에 있어서 어떠한 효과를 보이는지 제거회전력의 측정을 통해 알아보고자 하였으며, 그에 따른 교정력 적용의 확장과 임상적 의의를 알아보고자 하였다. 실험군은 분사처리 후 산부식(Sand-blasted Large grit, and Acid etched, SLA) 표면 처리된 교정용 미니 임플랜트인 C-implant (Cimplant, Seoul, Korea)를 사용하였으며 대조군은 같은 디자인이지만 표면 처리를 하지 않은 평활면 C-implant를 사용하였다. 실험군과 대조군을 각각 2개씩 11마리의 가토 경골에 식립하였고 식립 후 6주에 가토를 희생시켜 제거회전력을 측정하여 t-test를 통하여 두 군의 제거회전력 차이의 통계적 유의성을 알아보았으며 조직표본을 만들어 조직소견을 관찰하였다. 실험결과 제거회전력은 SLA 처리한 C-implant 군이 평활면 C-implant 군보다 통계적으로 유의성 있게 높은 결과를 보였다 (p < 0.05). 평활면 C-implant 군의 평균 제거회전력 값은 4.614 Ncm이고, SLA C-implant 군의 평균 제거회전력 값은 6.286 Ncm로, SLA 군이 평활면 군보다 73% 더 높은 제거회전력에 대한 저항성을 나타내었다. 이상의 연구 결과에서 SLA 표면처리가 C-implant의 골유착능을 증가 시켰음을 알 수 있었다. 따라서 표면 처리된 교정용 미니 임플랜트는 기존의 임플랜트에 비해 좀 더 강한 힘에 저항할 수 있으며 탈락률을 낮출 수 있을 것으로 생각된다. Objective: The purpose of this study was to compare the torque resistance to removal of sandblasted large grit and acid etched (SLA) surface treated orthodontic mini-implants and smooth surface orthodontic mini-implants as well as performing histologic observations. Methods: Two groups of custom screw shaped orthodontic mini-implants (C-implant, 1.8 mm outer diameter × 9.5 mm length, Cimplant, Seoul, Korea) were designated. 22 SLA treated C-implants (SLA group) and 22 machined surface C-implants (machined group) were placed in the tibia metaphysis of 11 adult New Zealand white rabbits. Following a 6-week healing period, the rabbits were sacrificed. Subsequently, the C-implants were removed under reverse torque rotation with a digital torque measuring device and independent t-test was performed. Selected tissues were prepared for histologic observation. Results: The SLA group presented a higher mean removal torque value (6.286 Ncm) than the machined group (4.491 Ncm) which was statistically significant (p < 0.005). Histologic observation revealed a trend of more new bone formation in contact with the screw surface in the SLA group than the smooth group. Conclusions: The results of this study suggested that SLA surface treatment can enhance the osseintegration potential for C-orthodontic mini-implants.

척추도수치료에 의해 악화된 결핵성 척추염-증례 보고-

이성훈,조민규,전평식,정한영,곽재륭,김미정,김종철 大韓再活醫學會 2000 Annals of Rehabilitation Medicine Vol.24 No.5

황색포도구균의 coagulase형과 항생제감수성 양상의 상관관계

전창호,서헌석,김상경 대한임상병리학회 1996 대한임상병리학회지 Vol.16 No.6

EVA/MMT 나노복합체의 제조 및 열적, 기계적 성질에 관한 연구

전철환,류승훈 경희대학교 산학협력기술연구원 2001 산학협력기술연구논문집 Vol.7 No.-

Ethylene vinyl acetate copolymer and montmorillonite nanocomposites were prepared by melt intercalation using HAAKE mixer. The influence of substituted alkylamine in MMTs and molecular weight(melt index) of EVA on the intercalation behavior of EVA/MMT composites were investigated. EVA/MMT composites were analyzed by X-ray diffraction in order to study the changes of MMT interlayer distance. The dimethyl dioctadecyl ammonium ion substituted MMT can exist nano-scale in EVA. Thermal stability of composites is improved about 40℃, and the modulus increases twice for pristine EVA for 10 wt% MMT.

韓國體育大學生들의 欲求特性에 關한 硏究

全承勳,劉丙烈,朴相龍,金根友 한국체육대학교 부속 체육연구소 1986 체육연구소논문집 Vol.4 No.-

The purpose of this study is to investigate the need traits of KNCPE (Korean national College of Physical Education) students and to find out the number of students to be required special guidance on counceling services. The instrument used investigation was the SNDT (Standardization Need Diagnostic Test) and this include descriptive and validity scales. The results are as follows: 1. Generally, the need of the KNCPE students belong to norm group. 2. The number of students who have abnormal scores in almost every scales are 9 (2.0%; male-5, female-4). 3. The students has above mentioned problem should join in the special guidance on counceling services.

일차성 Streptococcus pneumoniae 균혈증에 동반된 흉부 하행 대동맥염 1예

전민혁,고옥배,정우진,최영준,이정훈,최상호,김미나,김양수,우준희,류지소 대한감염학회 2005 감염과 화학요법 Vol.37 No.5

페렴구균에 의한 대동맥염은 국내에서 1예만 보고될 정도로 매우 드문 감염증이다. 저자들은 원발성의 폐렴구균혈증에 합병된 페렴구균 대동맥염 환자 1례를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Bacterial aortitis is rare and without surgical intervention, it usually leads to uncontrolled sepsis or catastrophic hemorrhage, ultimately, resulting in death. In the postantibiotic era, the dominant infecting organisms are Staphylococcus aureus and Salmonella spp.. In spite of frequent pneumococcal bacteremia, vascular seeding is rare and there is only one published report in Korea. We describe a 77-year-old female with primary pneumococcal bacteremia followed by aortitis of the descending aorta, which was successfully treated by aneurysmectomy, wide excision of periaortic tissue, aortobiiliac bypass via prosthetic graft, and antibiotic therapy.

Parvovirus B19 감염에 의한 후천성 적혈구 무형성증 1예 : A case report

김상경,전창호,서헌석,최정윤 대한임상병리학회 1996 대한임상병리학회지 Vol.16 No.4

철근 이음형 PC 보-기둥 내부 접합부의 구조적 거동에 관한 실험적 연구

김승훈,하상수,문정호,이리형,이강철,전병갑 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

In this study, new moment-resisting precast concrete beam-column joint is proposed for moderate seismic regions. It has the connection reinforcing bars, penetrated the joint and lap-spliced with the bottom bars of precast U-beam. An experimental study was carried out to investigate the joint behavior subjected to reverse cyclic loading and constant axial compressive load. Three precast beam-column interior were tested. The variables examined were the type of connection reinforcing bars and presence of transverse reinforcement in joint. Joint performance is evaluated on the basis of connection .strength, stiffness, energy dissipation, and drift capacity. Based on the test results, the precast connection is capable of matching or exceeding the performance of the monolithic connection and thereby provides the sufficient moment-resisting behavior to be applicable for moderate seismic regions.

목조건축의 도리결구재의 유형 분류 : 16세기 이전의 건축물을 중심으로 Focused on structures built before the 16th century

주상훈,전봉희 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(계획계)

The purpose of this study is to classify a purlin support type and its materials of Korean wooden structures and Chinese ones and consider it with the times and regions. There are side connecting bace(Takgak), slanting strut(Chasu), connecting beam(Chagyun), curved connecting beam(Charak), purlin-support(Dori-anchogong) and so on besides a basic beam in the type of purlin support forms have several characteristics in accordance with the times and regions. According to this classification. Structures of Koryo have a connection with structures of Song or Won dynasty in China. Periodic and regional characteristics of Korean wooden structure can be found in the use of curved Chasu or decorated Dori-anchogong.

Penicillinase Producing N.gonorrhoeae株와 Nom-Penicillinase Producing N.gonorrhoeae株의 약제 감수성에 관한 비교연구

김승곤,김호훈,김태전 서울保健大學 1990 論文集 Vol.10 No.1

Studies were carried out to evaluate the actual status of the carriers infected with N. gonorrhoeae among the high-risk populations over the country and to determine the drug resistance patterns of β-lactamase producing N. gonorrhocae isolates, in particular attention to the recent increasing discoveries of Penicillinase producing Neisseria gonorrhoeae strains this country. The results could be summerized as follows: 1. The isolation rate of N. gonorrhoeae from the suspicious gonorrhoeal patients (men) were 37.5% on the average, out of a total of 817 examined, but from the prostitutes or bar-girls the isolation rate showed 9.4% on the average out of 3.609 examined, of the isolated 644 gonorrhoeal strains, one hundred and fifty-three strains were detected as β-lactamase producing N. gonorrhoeae. The average detection rate of β-lactamase producing N. gonorrhoeae was 23.8%, but the frequency of PPNG detection was much different depening on the areas where the specimens collected ranging from 3.8%(Chun buk do) to 41.2%(Kyung buk do), except the area Jaeju island where on PPNG was detected. 2. Most non-PPNG strains were able to be inhibited at the concentration of the drugs below 32ug/ml of Penicillin G and 8ug/ml of Ampicillin, but nearly half or more than half of the β-lactamase producing N. gonorrhoeae strains were not inhibited at 32ug/ml of the drugs, In other words, β-lactamase producing N. gonorrhoeae had acquired high resistance to Pehicillin G and Ampicillin. 3. In susceptibility of PPNG and non-PPNG to spectinomycin, Kanamycin, Tetracycline, Erythromycin, Cefuroxin, Cefoperazone, it seemed to be no significant diffevence, but some exceptions showing a peculiar drug resistance to 16ug/ml of Cefuroxin, 64ug/ml of Kanamycin, 512ug/ml of Spectinomycin or 32ug/ml of Tetracycline. And also a few multi-resistance like PPNG strains could rarely be detected showing resistance to the concentration of Tetracycline 32ug/ml, Cefuroxin 16ug/ml, Kanamycin 64ug/ml. 4. In the correlation of inhibitory Zone size dise diffusion method on the MICS by agar plate dilution method to 89 N. gonorrhoeae strains with Pencillin G, Ampicillin, Erythromycin, Tetracycline, and chlorampenicol, Ampicillin showed the highest correlation coefficient as an absolute value showing r=-0.7598, which had negative correlation. Through these studies β-lactamase producing N. gonorrhoeae strains were able to be found from the specimens collected through all over the provinces of the country except the Island of Jaejudo hopsitols.