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변색 실활치에 대한 carbamide peroxide gel의 표백효과
박선아,김선호,황윤찬,오병주,윤창,박영준,정선와,황인남,오원만 大韓齒科保存學會 2002 Restorative Dentistry & Endodontics Vol.27 No.4
The bleaching of discolored nonvital teeth is conservative treatement that satisfy the cosmetic desire. The most common method for this treatement, walking bleaching, is using 30% hydrogen peroxide and sodium perborate. Many alternatives are suggested for preventing the external cervical root resorption that is the common complication of the nonvital teeth bleaching with 30% hydrogen peroxide. The same extent of oxidation reactions as that resulted by the bleaching with the application of 30% hydrogen peroxide and sodium perborate can also be acquired more safely by materials that contain 10% carbamide peroxide, used primarily for the bleaching of vital teeth. Therefore, this study was performed to evaluate the efficacy of 10% and 15% carbamide peroxide bleaching gel in nonvatal teeth bleaching. The internal bleaching of intentionally discolored teeth was performed in vitro with 10% carbamide peroxide (Group 1), 15% carbamide peroxide (Group 2), mixture of distilled water and sodium perborate (Group 3), and mixture of 30% hydrogen peroxide and sodium perborate (Group 4). The bleaching materials were refreshed following 3, 6, 9 and 12 days. To evaluate the bleaching effect, the color change of the crowns was measured at 1, 2, 3, 4, 7 and 15 days of bleaching using the colorimeter. The results were as follows : 1. L^* and ΔE^* values were increased with time in all bleaching agents(p<0.01). 2. There was no significant difference in L^* and ΔE^* value among bleaching agents. 3. Δ^* value higher than 3 was shown after 3 days of bleaching with 10% carbamide peroxide gel, 1 day with 15% carbamide peroxide gel, 4 days with mixture sodium perborate and distilled water and 4 days with mixture sodium perborate and 30% hydrogen peroxide, respectively. These results revealed that the use of 10% and 15% carbamide peroxide bleaching gel in non-vital teeth bleaching is as effective as mixture of distilled water and sodium perborate and mixture of 30% hydrogen peroxide and sodium perborate. Accordingly, carbamide peroxide could be used clinically to bleach discolored non-vital teeth.
Quantitative Estimation of Fruit Crops Water Stress using Infrared Imaging
( Ah-yeong Lee ),( Suk-ju Hong ),( Yun-hyeok Han ),( Seok Kyu Yun ),( Minyoung Kim ),( Ghiseok Kim ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
In order to enhance the competitiveness of agriculture and develop into future growth industries, researches are being conducted to spread smart farm universally that combines ICT. Among them, research on Phenomics, which is a technology for developing plant phenotype that combines ICT, bio, and optical technology, is essential. Among the various phenotypes of crops, leaf temperature of crops provides important physiological information for crop management such as moisture content, water stress, and disease. By measuring changes in plant temperature due to the opening and closing of crop pores, the response of crops to various stresses can be analyzed. Infrared thermal imaging technique is non-destructive unlike conventional contact sensors because it does not contact with objects. It makes it possible to measure the temperature of the entire range of the leaves, thus enabling accurate and precise temperature measurement. In this study, leaf temperature information of crops is extracted by thermal images. Using the extracted temperature, we confirmed the changes of the leaf temperature with time and the relationship between the leaf temperature and the soil water potential. Peach crops are used. After different soil water potential treatments, the temperature, humidity, water tension, thermal imaging data were obtained. After obtaining the spatial information of the leaves using thermal images, the temperature information of the leaves of each tree was extracted through image processing. The relationship between water stress and leaf temperature was analyzed by checking the relationship between the leaf temperature and soil water potential.
Jun Yeong Song(Jun Yeong Song),Eui Kyu Chie(Eui Kyu Chie),Seong-Hee Kang(Seong-Hee Kang),Yeon-Jun Jeon(Yeon-Jun Jeon),Yoon-Ah Ko(Yoon-Ah Ko),Dong-Yun Kim(Dong-Yun Kim),Hyun-Cheol Kang(Hyun-Cheol Kang) 대한방사선종양학회 2022 Radiation Oncology Journal Vol.40 No.4
Purpose: The safety of online contouring and planning for adaptive radiotherapy is unknown. This study aimed to evaluate the dosimetric difference of the organ-at-risk (OAR) according to the extent of contouring in stereotactic magnetic resonance image-guided adaptive RT (SMART) for pancreatic cancer. Materials and Methods: We reviewed the treatment plan data used for SMART in patients with pancreatic cancer. For the online contouring and planning, OARs within 2 cm from the planning target volume (PTV) in the craniocaudal direction were re-controlled daily at the attending physician's discretion. The entire OARs were re-contoured retrospectively for data analysis. We termed the two contouring methods the Rough OAR and the Full OAR, respectively. The proportion of dose constraint violation and other dosimetric parameters was analyzed. Results: Nineteen patients with 94 fractions of SMART were included in the analysis. The dose constraint was violated in 10.6% and 43.6% of the fractions in Rough OAR and Full OAR methods, respectively (p = 0.075). Patients with a large tumor, a short distance from gross tumor volume (GTV) to OAR, and a tumor in the body or tail were associated with more occult dose constraint violations—large tumor (p = 0.027), short distance from GTV to OAR (p = 0.061), tumor in body or tail (p = 0.054). No dose constraint violation occurred outside 2 cm from the PTV. Conclusion: More occult dose constraint violations can be found by the Full OAR method in patients with pancreatic cancer with some clinical factors in the online re-planning for SMART. Re-contouring all the OARs would be helpful to detect occult dose constraint violations in SMART planning. Since the dosimetric profile of SMART cannot be represented by a single fraction, patient selection for the Full OAR method should be weighted between the clinical usefulness and the time and workforce required.
간호학 전공 대학생의 임상 실습 관련 교육 어플리케이션에 대한 사용의도의 영향요인에 대한 연구
조윤정,김영순,박계영,김혜림,최일향,강보영,백진아,정수진,전영지,정연주 이화여자대학교 간호과학대학 2015 이화간호학회지 Vol.- No.49
Purpose: This study examined perceptions and intentions of nursing undergraduates to use educational mobile applications for clinical nursing-practice training. Methods: Participants were 189 junior and senior nursing undergraduates from 14 Korean universities, experienced in clinical practice and educational nursing mobile applications. Using a convenience sampling method, the questionnaire was Sim’s Perceptions and Intentions tool. Statistical analyses were conducted by t-test, one-way ANOVA, correlation, and multiple regression analysis with SPSS 22.0 Windows software. Results: Statistically significant differences emerged between those who used smartphones for more than 4 hours (18.56 ± 4.58) and less than 2 hours (15.84 ± 4.35) per day (F = 3.25, p = .041). Perception and intention of educational-applications use correlated positively (r = .723, p < .001). Performance expectancy (β = .225, p = .002), attitude toward technology (β = .446, p < .001), facilitating condition (β = .132, p = .022), and self-efficacy (β = .168, p = .008) were statistically significant predictors of intention to use educational mobile applications (Adjusted R2 =.616, p < .001). Conclusion: Attitude toward using technology, performance expectancy, and self-efficacy will improve use of nursing educational mobile applications for clinical nursing-practice training. Developers should consider students’ experience in clinical-nursing practice and readiness to use mobile technology.
Effect of a coconut oil intervention on the periodontal health of smokers
Yun-Jeong Kim,Jin-Ju Yang,Seon Yeong Kim,Ah-Young Choi,Woo-Jung Noh 한국치위생학회 2023 한국치위생학회지 Vol.23 No.1
Objectives: This study performed a comparative evaluation of the effects of oil pulling on the periodontal health of smokers. Methods: The experimental (15 subjects) and control (15 subjects) were provided coconut oil and distilled water, respectively. We evaluated the pocket depth (≥4 mm), bleeding on exploration, and Patient Hygiene Performance (PHP) index in both groups following the interventions. Clinical parameters were assessed at baseline, after 4 weeks, and after 8 weeks. Dry mouth and oral health-related quality of life were evaluated at baseline and after 8 weeks. Results: Bleeding on exploring in the control group decreased from 26.17 to 18.33 and from 26.07 to 12.53 in the experimental group (p=0.030), with significant differences in measurement time (p<0.001), and the interaction between group and measurement time (p=0.002). The PHP index in the control group decreased from 24.50 to 16.17 and from 24.00 to 9.83 in the experimental group (p=0.027), with significant differences in measurement time (p<0.001), and the interaction between group and measurement time (p=0.001). Furthermore, the experimental group showed a significant decrease in dry mouth (p<0.001) and a significant increase in oral health-related quality of life (p=0.025). Conclusions: The coconut oil intervention positively affected the periodontal health of smokers.
Osteoblastic behavior to zirconium coating on Ti-6Al-4V alloy
Yeong-Joon Park,Hyun-Ju Chung,Young-Joon Kim,Yun-Ze Xuan,Hae-Jin Kima,Bo-Ah Leea 대한치과보철학회 2014 The Journal of Advanced Prosthodontics Vol.6 No.6
PURPOSE The purpose of this study was to assess the surface characteristics and the biocompatibility of zirconium (Zr) coating on Ti-6Al-4V alloy surface by radio frequency (RF) magnetron sputtering method. MATERIALS AND METHODS The zirconium films were developed on Ti-6Al-4V discs using RF magnetron sputtering method. Surface profile, surface composition, surface roughness and surface energy were evaluated. Electrochemical test was performed to evaluate the corrosion behavior. Cell proliferation, alkaline phosphatase (ALP) activity and gene expression of mineralized matrix markers were measured. RESULTS SEM and EDS analysis showed that zirconium deposition was performed successfully on Ti-6Al-4V alloy substrate. Ti-6Al-4V group and Zr-coating group showed no significant difference in surface roughness (P>.05). Surface energy was significantly higher in Zr-coating group than in Ti-6Al-4V group (P<.05). No difference in cell morphology was observed between Ti-6Al-4V group and Zr-coating group. Cell proliferation was higher in Zr-coating group than Ti-6Al-4V group at 1, 3 and 5 days (P<.05). Zr-coating group showed higher ALP activity level than Ti-6Al-4V group (P<.05). The mRNA expressions of bone sialoprotein (BSP) and osteocalcin (OCN) on Zr-coating group increased approximately 1.2-fold and 2.1-fold respectively, compared to that of Ti-6Al-4V group. CONCLUSION These results suggest that zirconium coating on Ti-6Al-4V alloy could enhance the early osteoblast responses. This property could make non-toxic metal coatings on Ti-6Al-4V alloy suitable for orthopedic and dental implants.