성견에서 사다리꼴형 디자인과 미세나사선을 가진 단폭경임플란트의 골유착 평가

장윤영(Yun-Young Chang),윤정호(Jeong-Ho Yun) 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.7

Objective: The objective of this study was to evaluate the osseointegration of narrow-diameter implant with trapezoid-shape and to evaluate the effect of coronal microthreads on trapezoid-shape narrow-diameter implant. Materials and Methods: The experimental narrow-diameter implants were classified into two groups according to absence or presence of coronal microthreads: trapezoid-shape narrow diameter implant (TN group) and trapezoid-shape narrow-diameter implant with microthreads (TNM group). They were installed alternately in bilateral mandible in three dogs. After 8 weeks, the animals were sacrificed. Resonance frequency analysis, removal torque test, and histometric analysis were performed. Results: Statistically higher implant stability quotient (ISQ) values were observed in TNM group than in TN group at the time of implant installation. However, significant ISQ values difference was not observed between groups at 8 weeks. Both groups showed significantly increased ISQ values at 8 weeks, compared to the time of implant installation. There was no significant difference between groups in removal torque test. Bone-implant contact ratio also showed no significant difference between groups in total and coronal part. Conclusion: Within the limitation of this study, it could be concluded that the trapezoid-shape design on narrow-diameter implant showed successful ossointegration, and the microthreads on coronal part did not result in significant bone-implant contact and biomechanical stability at 8 weeks.

중등도 치주질환에 대한 Vitamin C, Vitamin E, lysozyme, carbazochrome (이가탄<SUP>®</SUP>) 복합제제의 임상 효과

장윤영(Yun-Young Chang),장용주(Yong-Ju Jang),정임희(Im-Hee Jung),엄유정(Yoo-Jung Um),정의원(Ui-Won Jung),김창성(Chang-Sung Kim),김백일(Baek-Il Kim),최성호(Seong-Ho Choi) 대한치과의사협회 2009 대한치과의사협회지 Vol.47 No.12

Purpose : The purpose of this study was to evaluate the clinical effect of Vitamin C, Vitamin E, lysozyme, carbazochrome complex medicine(IGATAN<SUP>®</SUP>) for periodontal disease Material and Methods: The study was performed by double blinded, ramdomized method. Forty two subjects diagnosed as chronic incipient or moderate periodontitis at department of periodontology, Yonsei Dental Hospital were included in the study. This study was approved by Institutional Review Board, Yonsei Universtiy Hospital. All subjects received scaling at their first examination and second examination was scheduled after 2 weeks. At second examination, periodontal parameters such as plaque index(PI), gingival index(GI), probing depth(PD), bleeding on probing(BOP), gingival recession(GR) and clinical attachment level(CAL) were recorded(Baseline) with prescription of Vitamin C, Vitamin E, lysozyme, carbazochrome complex(IGATAN<SUP>®</SUP>) (Experimental group 23 subjects) or placebo medicine(Control group; 19 subjects). The subjects were recalled after 4 weeks for periodontal parameters measurement. Results: In the experimental groups, PI, GI, CAL and BOP scores were significantly reduced at 4 weeks compared to baseline. A statistically significant decrease in GI and BOP scores were observed in the experimental group compared to the control group. Conclusion: It can be concluded that Vitamin C, Vitamin E, lysozyme, carbazochrome complex medicine(IGATAN<SUP>®</SUP>) have an effect in reducing gingival bleeding and improving periodontal inflammatory condition inchronic incipient- moderate periodontitis.

중환자실 간호사의 간호행위 전 ․ 후 손씻기 수행율 비교

김영중(Kim, Young-Jung),김희승(Kim, Hee-Seung),장윤영(Chang, Yun-Young) 기본간호학회 2011 기본간호학회지 Vol.18 No.2

Purpose: The purpose of this study was to assess rates for handwashing adherence before and after nursing contact in intensive care units (ICU). Methods: The participants included 90 nurses working in intensive care units of an 800-bed university-affiliated hospital in Gyeonggi Province and 2000-bed university-affiliated hospital in Seoul. Time for handwashing was calculated using the average number of handwashings during an 8-hour day shift. Nursing contact was based on indications as defined by the Centers for Disease Control and Prevention (CDC, 2002). Data were analyzed using frequency, percent, t-test and χ<SUP>2</SUP>-test. Results: During an 8-hour day shift, the average number of times that hands were washed was 25.0. The rates were significantly lower before the nursing contact than after the nursing contact when it involved sectioning, observation or contact with a wound, cleaning enteric feeding bag, physical exam, use of gloves, or contact with contaminants. Conclusions: The results indicate that as handwashing rates were significantly lower before nursing contacts than after nursing contacts, there is need to develop strategies to address this deficiency in handwashing.

발치후 즉시 임플란트의 8년 누적 생존율에 대한 후향적 연구

고승희(Seung-Hee Ko),장윤영(Yun-Young Chang),엄유정(Yoo-Jung Um),정의원(Ui-Won Jung),김창성(Chang-Sung Kim),조규성(Kyoo-Sung Cho),최성호(Seong-Ho Choi) 대한치과의사협회 2009 대한치과의사협회지 Vol.47 No.11

Purpose : Schulte introduced immediate implant cases in 1970s, since then many patients have been treated by immediate implants. The aim of this study was to evaluate the cumulative survival rate of immediate implant and to analyze various factors associated with survival of immediate implant in a 8-year period retrospectively. Materials and methods: From May, 2000 to October, 2007, 77 implants were placed in 63 patients immediately after tooth extraction at Department of Periodontology, Yonsei University Hospital. The implant survival rate was analyzed using a life-table analysis. After delivery of prosthesis, along I year of observation period, all implants were evaluated clinically and radiographically. Results: Among 77 implants, 59 were placed in maxilla and 18 in mandible. The most common site of the implantation was Mx anterior (65%). The overall survival rate was 94.8% over a mean follow-up period of 44.2±21 months and the 8-year cumulative survival rate was 94.6%. Failure occurred in 4 implants, all of which were due to early failures. None of the following factors were significantly associated with the survival of immediate implants: advanced surgical technique including bone graft and guided bone regeneration, the types of implants, causes of tooth loss, and types of prosthesis. Conclusion: On the basis of 8-year life time analysis, immediate implant placement can be considered a safe and predictable treatment mordality.

수학 수업 발문유형 분석 및 대안 탐색 -신임 교사 사례 연구-

강완 ( Wan Kang ),장윤영 ( Yun Young Chang ),정선혜 ( Seon Hye Jeong ) 한국수학교육학회 2011 初等 數學敎育 Vol.14 No.3

이 연구는 2년차 신임 교사의 사례 연구를 통해 수학 수업에 대한 신임교사의 발문 유형의 특성을 분석하고 그에 따른 대안을 탐색하기 위한 것이다. 연구 결과, 확인을 위한 발문이 가장 많았으며(69%), 이해를 위한 발문(25%), 성찰을 위한 발문(6%) 순이었고, 창의성 신장을 위한 발문은 하지 않는 것을 알 수 있었다. 더불어 기존 연구를 바탕으로 신임교사의 발문과 관련된 대안적인 창의성 신장을 위한 발문을 제안해 보았다. The objective of this study is to search the recognition of teacher on the pattern and characteristics of the questioning sentence of the newly appointed teachers for the mathematics class through the case study for the 2ndyear teachers. The study participants` class was recorded in video and individual interview was made for 4 times. The pattern of the questioning sentence in the observed class was analyzed using the classification frame with addition of creativity related items to the classification frame suggested by Mogan & Saxton(2006). The questioning sentence and recognition on the mathematics class for the newly appointed teachers were analyzed based on the individual meeting and class materials. In result, the questioning sentence for confirmation was most frequent (69%) and questioning sentence of understanding (25%) and the questioning sentence for introspection (6%) in its priority. It was known that the questioning sentence for extending the creativity didn`t make it at all. It was revealed that the participant teachers in this study used the questioning sentence pattern for fact confirmation of the student most frequently and the use of the questioning sentence for accelerating the creative thinking of the student was lacked. In addition, the teachers recognized that they manage the class oriented to questioning sentence for obtaining the concept. It was known that the education for the questioning sentence which accelerates the creativity and other thinking as well as the fact confirmation pattern is necessary through the training for the new teachers in the future.

임플란트 주위 각화 조직 폭경의 증대를 위한 유리치은 이식술과 세포외 기질 이식술의 임상적 평가

정휘성(Hwi-Seong Jeong),강준호(Jun-Ho Kang),장윤영(Yun-Young Chang),윤정호(Jeong-Ho Yun) 대한치과의사협회 2017 대한치과의사협회지 Vol.55 No.1

Inadequate keratinized mucosa around dental implants can lead to more plaque accumulation, tissue inflammation, marginal recession and attachment loss. We evaluated the effects of free gingival and extracellular matrix membrane grafts performed to increase the insufficient width of keratinized tissue around dental implants in the posterior mandible. A 47-year-old female patient presented with discomfort due to swelling of the lower right second premolar area. Due to severe destruction of alveolar bone, the tooth was extracted. After 3 months, a guided bone regeneration (GBR) procedure was performed and then a dental implant was placed 6 months later. During the second-stage implant surgery, free gingival grafting was performed to increase the width of the keratinized tissue. After 12 months, a clinical evaluation was performed. A 64-year-old female patient had a missing tooth area of bilateral lower molar region with narrow zone of keratinized gingiva and horizontal alveolar bone loss. Simultaneous implant placement and GBR were performed. Five months after the first-stage implant surgery, a gingival augmentation procedure was performed with an extracellular matrix membrane graft to improve the width of the keratinized tissue in the second-stage implant surgery. After 12 months, a clinical evaluation was performed. In these two clinical cases, 12 months of follow-up, revealed that the increased width of the keratinized tissue and the deepened oral vestibule was well maintained. A patient showed a good oral hygiene status. In conclusion, increased width of keratinized tissue around dental implants could improve oral hygiene and could have positive effects on the long-term stability and survival rate of dental implants. When planning a keratinized tissue augmentation procedure, clinicians should consider patient-reported outcomes.

가압생물반응기에서 유기물 및 암모니아성 질소의 제거특성

황병호(Byung Ho Hwang),최정열(Zhen Lie Cui),장윤영(Yun Young Chang),최대기(Dae Ki Choi),황경엽(Kyung Yub Hwang) 大韓環境工學會 1999 대한환경공학회지 Vol.21 No.5

군기지 오염토양의 정화 방법에 대한 연구

양혁수 ( Hyuk Soo Yang ),김임순 ( Im Soon Kim ),강선홍 ( Seon Hong Kang ),장윤영 ( Yoon Young Chang ),박세규 ( Seh Kyu Park ),고재욱 ( Jae Wook Ko ),김연정 ( Yun Jung Kim ),박철환 ( Chul Hwan Park ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.5

대량의 유류 취급과 사격, 폭파훈련으로 인한 피탄지에 중금속 물질의 발생, 많은 인원이 사용 후 발생되는 폐기물,노후화된 시설물(구조물 포함) 등으로 인해 군부대는 환경오염사고를 야기할 수 있는 가능성을 지니고 있다. 경기도의정부시에 위치한 5개의 반환미군기지를 대상으로 오염도를 분석하였으며, 그 결과 TPH (Total PetroleumHydrocarbons), BTEX (Benzene, Toluene, Ethylbenzene, Xylene), 중금속에 의한 토양오염과 지하수 오염을 확인할 수있었다. 군기지 오염토양의 정화를 위하여 토양증기추출법, 슬러핑공법, 토양경작법 및 토양세척법이 적용되었으며, 적용된 5개의 부지 모두 법적 기준에 적합하도록 정화되었다. Handling of the large quantity of oil, generation of heavy metals at the military blasting range and outwornfacilities could cause the environmental accidents. Pollution levels of the former five U.S military bases located inUijeongbu, Gyeonggi-do were measured. Soil contamination by TPH (Total Petroleum Hydrocarbons), BTEX (Benzene,Toluene, Ethylbenzene, Xylene), and heavy metals and groundwater contamination were detected. In order to purifycontaminated soil, a variety of technologies including soil vapor extraction, slurping, landfarming and soil washing wereapplied. Contaminated soils of five target bases were purified and the results were suitable for the legal standards.