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초등학생의 Molar Incisor Hypomineralization 유병률과 제1대구치 치아우식증 및 수복상태 조사
신종현,안울진,김신,정태성 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.2
Molar Incisor Hypomineralization(MIH) have recently gained intensive research interests and various clinical trials. Most prevalence, etiology, treatment studies in MIH were carried out in the European countries, and data from the Korean were seldom. This study aimed to investigate the prevalence of MIH and the status of dental caries and treatment on the first permanent molars in primary school children. For this study, 1.344 primary school students in Busan and Ulsan cities were examined directly the permanent incisors and first molars. The results of the survey were as follows: 81 MIH cases were identified among 1.344 cases. The prevalence of MIH in this group of children was 6.0%. Children with MIH showed a significantly higher DMFT value for permanent teeth than children without MIH. The mean number of decayed, missed, and filled in 1st permanent molars(DMFT index) was 1.17. The rate of children with restoration on 1st permanent molar was 13.6% and the sequence of restoration materials was as follows: composite resin, amalgam, gold inlay. Molar Incisor Hypomineralization(MIH)에 관하여 최근 많은 연구적 관심이 집중되고 여러 임상적 대처방법들이 제시되고 있다. 이미 세계적으로는 MIH의 빈도, 병인, 치료 등에 관한 많은 연구보고가 있었으나, 우리나라에서는 이에 대한 관심이 아직 미미한 것으로 사료된다. 본 연구는 초등학생의 MIH 유병률과 제1대구치 우식 및 치료 실태에 대하여 조사할 목적으로 시도되었다. 부산 및 울산광역시에 거주하는 1,344명의 초등학생을 대상으로, 상하 제1대구치와 전치부를 직접 시진하여, MIH 유병률, 제1대구치 우식경험지수와 치료 상태를 조사하여 다음과 같은 결과를 얻었다. 총 1,344명 의 조사 대상 중 81명에서 MIH가 나타나, 유병률은 6.0%를 보였으며, MIH에 이환왼 어린이의 제1대구치 우식경험지수는 비이환군에 비해 통계적으로 유의하게 높았다(P<0.05) 한편, 제1대구치 우식경험지수는 1.17개로 나타났다. 조사 대상 제1대구치의 13.6%가 수복되어 있었고, 수복재 별로는 복합 레진, 아말감, gold inlay의 순이었다.
전치부의 발육 결함 및 교정 후 탈회 병소의 심미적 개선을 위한 resin infiItration
김은영,안울진,김신,정태성 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.2
어린이 영구전치의 법랑칠 발육 결함이나 고정성 장치에 의한 교정치료 후 탈회 병소는 흔히 심미적 문제를 유발한다. 본 연구는 상악 전치부에 위 원인에 의한 탈회로 인하여 백반양 병소를 보이는 21명 어린이의 38개 치아를 대상으로, 최근 비침습적인 방법으로 소개된 resin infiltration 기법을 적용하고, 병소의 색조의 임상적 개선 효과를 비교, 분석하여 다음과 같은 결과를 얻었다. 1. 1주 후 색조가 개선된 병소는 발육 결함 병소의 25%, 교정 탈회 병소의 61%로 나타났다. 2. 발육 결함 병소의 40%, 교정치료 후 탈회 병소의 6%에서는 시술 전후의 색조변화를 관찰할 수 없었다. 3. 법랑질 발육결함 병소에서는 시술 직후 보다 1주 후에 더 많은 색조 변화를 관찰할 수 있었다. 결과적으로 일부 증례에서는 색조의 극적인 개선이 관찰되었으나, 또 일부 증례에서는 변화가 거의 나타나지 않았는데, 이는 병소 깊이의 차이에 기인한 것으로 사료되었다. The prevalence of developmental defects of enamel and lesios by post-orthodontic decalcification has been reported with increasing frequency. Even though there have been increasing interests and clinical challenges in esthetic improvement of these lesions, few of studies were reported for using non-invasive approach which is a very significant matter for child and young adults. This study was conducted to assess clinical effect on the improvement in color of these lesions via resin infiltration method developed as minimum invasive technique for white spot. For the 38 maxillary anterior teeth with calcification problem. the changes in color between before- and after- infiltration treatment, were evaluated and summarized as following. 1. A week after infiltration, 25% of developmental defects and 61% of decalcification lesions were improved in color as the value of ΔE below 3.7. 2. 40% of the developmental defects and 6% of decalcification lesions showed no significant change. 3. The developmental defects showed more remarkable changes in color 1 week after infiltration rather than immediately after the treatment. From our study results, it is considered that the amount of color improvement depended on the depth of lesion. In other words, for the lesion having more depth than the depth infiltrant resin can penetrate into, infiltration treatment showed no significant effect. Therefore, for clinical indication of resin infiltration treatment, further research on precise measurement technique of lesion depth is strongly required.
Shin, Sung Ui,Chang, Jung Min,Bae, Min Sun,Lee, Su Hyun,Cho, Nariya,Seo, Mirinae,Kim, Won Hwa,Moon, Woo Kyung Springer International 2015 EUROPEAN RADIOLOGY Vol.25 No.1
<P>To compare the average glandular dose (AGD) and diagnostic performance of mediolateral oblique (MLO) digital breast tomosynthesis (DBT) plus cranio-caudal (CC) digital mammography (DM) with two-view DM, and to evaluate the correlation of AGD with breast thickness and density.</P>
Measurement of Fractional Exhaled Nitric Oxide in Adults: Comparison of Two Different Analyzers
( Sung-yoon Kang ),( Sang Pyo Lee ),( Taehyun Nam ),( Ui Won Ko ),( Sang Min Lee ),( Sun Young Kyung ),( Shin Myung Kang ),( Jeong-woong Park ),( Sung Hwan Jeong ) 대한결핵 및 호흡기학회 2020 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.128 No.-
Background Fractional exhaled nitric oxide (FeNO) is a recognized marker for eosinophilic airway inflammation and treatment decisions for responses to corticosteroids. Our study evaluated the differences between two FeNO analyzers and derived a correction equation for adults. Methods A total of 99 participants with the chief complaint of cough and dyspnea, who attended the outpatient clinics, were selected. They underwent concurrent FeNO measurement in a random order using NIOX VERO<sup>®</sup> (Circassia AB, Solna, Sweden) and NObreath<sup>®</sup> (Bedfont, Kent, UK). Agreement between the devices was evaluated by Wilcoxon tests, Spearman’s tests, and Bland-Altman plots. Results: Of the recruited 99 participants, they had a middle-aged female predominant feature (mean age: 51.2 ± 17.1 years and female 58.6%). Patients with asthma were found in 58.6 % of all participants. The median FENO level measured with the NIOX VERO<sup>®</sup> (27, interquartile range, 15-45) was significantly lower than that measured with NObreath<sup>®</sup> (38, 22-58, p < 0.001 ). There was a strong positive correlation in the measurement of FENO level between the devices (r= 0.787, p < 0.001). Bland- Altman plots confirmed this agreement. The following conversion equation was derived using linear regression: Ln (NObreath<sup>®</sup>) = 0.728 × Ln (NIOX VERO<sup>®</sup>) + 1.244. Conclusions The present study demonstrated that the values of two FeNO analyzers were in good agreement and had positive correlations. The correction equation that we provided could help assess the data obtained by these two analyzers.
RF Generator Design for High-quality Power at Light Load
Hee Sung Shin,Shin Ui Lee,Kyung Hyun Lim,Euihoon Chung The Korean Society Of SemiconductorDisplay Technol 2024 반도체디스플레이기술학회지 Vol.23 No.2
To generate the plasma required in dry cleaning processes, the plasma chamber must be supplied with a high-quality AC voltage with a voltage of more than 1 kV and a frequency of 400 kHz. In the existing research, many methods to supply high power have been studied, but how to improve the quality of the power for high-quality plasma has been relatively little studied. In this paper, we propose a study to improve the quality of RF power circuit for high-quality plasma generation in dry cleaning method. Existing methods in the environment of full-bridge-based RF power circuits must perform PWM duty control in the light load region. This causes distortions in the waveform, resulting in poor power quality, which directly leads to poor plasma quality. To solve these problems, a half-bridge switching method is proposed and the improvement in waveform quality is verified. To verify the feasibility of the design and control algorithm proposed in this paper, an RF power circuit prototype is fabricated and the proposed design and control method is verified through simulation and actual experiments under dummy load.
( Sang Hyun Park ),( Jin Kyung Chae ),( Sun Yong Kwon ),( Ui Kyung Kim ),( Shin Moo Kim ),( Kun Park ),( Seok Don Park ) 대한피부과학회 2013 대한피부과학회 학술발표대회집 Vol.65 No.2
Background: In vitro activities of retapamulin against mupirocin- and fusidic acid- resistant, methicillin-resistant Staphylococcus aureus isolates from Korea are not well known. Objectives: The aims of the study were to determine the acitivities of retapamulin and fusidic acid against mupirocin-resistant (MUP-R) MRSA isolates from clinical specimens. Methods: MRSA isolates were collected from three university hospitals in 2009-2010. Antimicrobial susceptibility was determined by the CLSI agar dilution method. femA, mecA and mupA genes were detected by PCR. Results: 1. The MIC range of fusidic acid for the low-level MUP-R MRSA isolates were ≥128 ug/mL, but the MIC range and MIC90 for the high-level MUP-R isolates were ≤ 0.5-≥32 ug/mL, and ≥32 ug/mL, respectively. 2. The MIC ranges and MIC90s of retapamulin for both the low-level and high-level MUP-R MRSA isolates were 0.5-1 ug/mL and l ug/mL, respectively. 3. Among the 21 MUP-R MRSA isolates tested, all 13 low level-resistant isolates were resistant to fusidic acid, but susceptible to retapamulin. Among the eight high-level MUP-R isolates 63% were resistant to fusidic acid, but all were susceptible to retapamulin. Conclusion: Retapamulin is highly active against MRSA isolates resistant to mupirocin and fusidic acid.