교정용 미니스크류의 디자인에 따른 임상적 안정성

Dept. of Dental Science/석사Stability of orthodontic miniscrews according to screw designThis study was to evaluate the clinical efficiency of tapered and cylindrical miniscrews by estimating their success rate and long-term stability. There were 105 tapered and 122 cylindrical self-drilling miniscrews placed into the maxillary and mandibular buccal alveolar areas of 132 patients (43 males, 89 female) who were over 16 years old. The insertion torque (IT) and removal torque (RT) were measured using a torque sensor during implantation and removal of miniscrews and Periotest values (PTV) were recorded. And the miniscrews were checked after implantation to determine success or failure. The results of this study were as follows.1)The success rates of the tapered and cylindrical miniscrews examined were similar between two types of design. 2)In the buccal side of maxilla, the insertion torque of tapered miniscrews (8.3 Ncm) was significantly higher than that of cylindrical miniscrews (6.3 Ncm) (P 0.05).5)The distal area of the first molar had significantly lower success rates than other sites of insertion (P <0.01). But there was no significant difference in success rates according to gender, jaw and side of insertion. Tapered type miniscrews had higher initial stability compared to cylindrical type miniscrews, whereas the clinical success rates and removal torques were similar between the two designs. The long term stability and success rate can be affected by various factors, such as insertion torque, individual anatomical variation and insertion site.ope

3차원 출력 방식 트레이를 이용하여 클리닉에서 제작 가능한 교정 간접 부착 시스템의 정확성

이 연구는 tray-printing method (TP) 및 marker-model printing method (MP)를 사용하여 클리닉에서 제작된 IDB 트레이의 브라켓 위치 정확도를 평가하고 비교하는 것을 목표로 하였다. TP group 은 3D 소프트웨어를 사용하여 제작된 트레이의 분할 여부에 따라 두 그룹 [single-tray printing (STP) 및 multiple-tray printing (MTP)]으로 나누었다. 세 그룹의 실험군 각각에 대해 5 개의 복제된 상악 석고모델을 사용하였고, 제 2 대구치를 제외한 총 180 개의 인공 치아를 평가하였으며, 모델 스캐너(E3; 3Shape Dental Systems, Copenhagen, Denmark)를 이용하여 치아 모델을 스캔하였다. 삼차원 소프트웨어를 이용 하여 치아의 FA point 에 가상 브라켓을 위치시키고 IDB 트레이를 디자인하였으며, 3D 프린터(VIDA; EnvisionTEC, MI, USA)를 사용하여 트레이를 출력하였다. 브라켓의 위치 정확성은 3D 분석을 사용하여 소프트웨어 상에서 계획된 브라켓 위치와 실제 브라켓 위치를 비교하여 평가하였다. ANOVA 를 이용하여 main effects 와 first-order interaction effect 를 분석하였다. 평균 거리 오차는 STP 그룹에서 0.06 mm, MP 및 MTP 그룹에서 0.09 mm 를 보였다. 평균 높이 오차는 STP 그룹에서 0.10 mm, MP 및 MTP 그룹에서 각각 0.15 mm 및 0.18 mm 이였다. 평균 거리 및 높이 오차는 MP 및 MTP 그룹보다 STP 그룹에서 유의성 있게 낮은 결과를 보였다 (p 0.05). CAD(computer-aided design)과 3D 프린터를 이용한 in-office IDB 시스템은 선형 및 각도 오류를 고려하였을 때, 임상적으로 적용이 가능하다. 본 연구 결과, 브라켓 위치 오류 빈도가 낮고 제작이 용이한 STP 방법을 사용하여 제작된 IDB 트레이를 임상에 적용하는 것을 권장한다. In this study, we aimed to evaluate and compare the bracket-positioning accuracy of the indirect bracket bonding (IDB) transfer tray fabricated in-clinic using the tray-printing (TP) and marker-model printing (MP) methods. The TP group was further divided into two groups [single-tray printing (STP) and multiple-tray printing (MTP)] depending on the presence of a tray split created using the 3D software. Five duplicated plaster maxillary models were used for each of the three experimental groups, and a total of 180 artificial teeth, except the second molar, were evaluated in the experiment. Dental model was scanned using a model scanner (E3; 3Shape Dental Systems, Copenhagen, Denmark). Virtual brackets were placed on FA points, and the IDB trays were designed and fabricated using a 3D printer (VIDA; EnvisionTEC, MI, USA). The accuracy of bracket positioning was evaluated by comparing the planned bracket positions and the actual bracket positions using 3D analysis on an inspection software. The main effects and first-order interaction effects were analyzed together by ANOVA. The mean distance error was 0.06 mm in STP group and 0.09 mm in the MP and MTP groups. The mean height error was 0.10 mm in STP group and 0.15 mm and 0.18 mm in MP and MTP groups, respectively. The mean distance and height errors were significantly lower in the STP group than those in the MP and MTP groups (p 0.05). The in-office-fabricated IDB system with computer-aided design and 3D printer is clinically applicable considering the linear and angular errors. We recommend IDB trays fabricated using the STP method owing to the lower distance and height error of bracket-positioning errors and ease of fabrication.open박

(A) Study on High-Integration to fabricate High-Voltage Lithium Ion Thin-film Battery

학위논문(석사) --서울대학교 대학원 :재료공학부, 2009.2.Maste

High performance sensor based on maximization of surface roughness of organic semiconductor thin film using control of surface energy of buffer layer

본 발명은 완충층의 표면에너지 제어를 이용한 유기반도체 박막의 표면거칠기 극대화에 기반한 고성능 센서에 관한 것으로, 위해, 기판; 기판 상부에 형성되고, 소수성 유기반도체로 구성되는 활성층; 및 기판과 활성층 사이에 형성되고, 소수성 유기반도체의 분자들간 응집에너지보다 작은 활성층-기판간 접착에너지를 유도할 수 있도록, 소수성 유기반도체의 분자들간 응집에너지보다 작은 표면에너지를 갖는 소재로 구성되는 완충층을 포함하는 센서를 제공한다

충청남도 4대수계 주요하천 모니터링 결과보고서(2016년)

충청남도 주요하천 수질현황 및 변화추세 분석을 통한 도민, 공무원, 관련 전문가들에게 유용한 정보를 제공하기 위한 자료집 제작1. 충청남도 수계 및 하천 현황 2. 주요하천 수질 현황 3. 공간자료 분

Consumption of Han-Sik and its association with socioeconomic status among Filipino immigrant women: The Filipino women&apos;s diet and health study (FiLWHEL)

Objectives: This study examined the consumption of Han-sik and its association with the years of residencein Korea and the socioeconomic status among Filipino immigrant women of the Filipino Women&apos;s Diet andHealth Study (FiLWHEL). Methods: A total of 474 Filipino women married to Korean men were included in the analysis. Their dietaryintake was assessed using a single-day 24-hour recall. The participants provided information on thedemographics, socioeconomic, and health-related factors through face-to-face interviews. The generalized linearmodel and logistic regression model were used to examine the association between the socioeconomic statusand consumption of Han-sik. Results: The mean age of the participants was 34.3 years old, and the average duration of residence in Koreawas 8.2 years. Among 474 Filipino women, a total of 467 consumed Han-sik, with an average of 6.8 fooditems per day. The Han-sik foods that the participants consumed most frequently were rice, cabbage kimchi,mixed-grain rice, and fried eggs. The average ratio of Han-sik was 58.57%. The ratio of Han-sik showed nosignificant associations with the years of residence, years of living together with their husband, educationlevels, total annual family income, or linguistic competence of Korean. However, the ratio of Han-sik use wasassociated with cohabitation with parents-in-law; the odds ratio (95% confidence interval) was 2.41 (1.18-4.92,p-trend = 0.002) comparing the fourth quartile with the first quartile of the Han-sik ratio. Conclusions: Filipino immigrant women in the FiLWHEL study consumed a larger number of Han-sik thanPhilippine foods. In addition, cohabitation with their parents-in-law was associated with the consumption ofHan-sik. Further epidemiologic studies will be needed to determine how the diet affects the health andwellbeing of immigrant women in Korea.N

A Position Statement of the Utilization and Support Status of Continuous Glucose Monitoring in Korea

Survey on continuous glucose monitoring system in Korea. Various supports such as compensation, insurance coverage expansion, and reimbursement are required to increase the effectiveness of CGM while considering the scale of benefit recipients, policy priorities, and financial requirements