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Kinds of Students Terms modified by Students Selected AbstractsLIFE IN THE 813: ONE DAY A MIGRANT STUDENT, THE NEXT A GANGSTERANNALS OF ANTHROPOLOGICAL PRACTICE, Issue 1 2009Alayne Unterberger In this article, I summarize, through the use of two case studies, the anthropological contributions when working with farmworker,migrant youth who have become "gang-involved." The Florida Institute for Community Studies (FICS) worked with a total of 65 youth and their families in a federal antigang initiative, with one session being held in a Presbyterian-based farmworker mission and another at a middle school. Both groups of youth live in rural Hillsborough County, Florida, with a lack of afterschool or other prosocial opportunities outside of school. I share my personal experiences and reflections on how I got involved in working with gangs, which had not been a priority for me in the past. One area of concern was our finding that youth were recruited into gangs and risky behaviors through friendship and familial networks. The school-based youth did not fare as well as the mission-based group, principally because of labeling by the school and the lack of autonomy of youth in a school setting to take ownership of the program. I provide recommendations for anthropologists working with youth who live "la vida loca" or the crazy life. [source] THE IMPACT OF PRICES AND CONTROL POLICIES ON CIGARETTE SMOKING AMONG COLLEGE STUDENTSCONTEMPORARY ECONOMIC POLICY, Issue 2 2001C Czart Smoking among youths and young adults rose throughout the 1990s. Numerous policies were enacted to try to reverse this trend. However, little is known about the impact these policies have on the smoking behavior of young adults. This article uses a dichotomous indicator of daily smoking participation in the past 30 days, an ordered measure representing the frequency of cigarette consumption, and a quasi-continuous measure of the number of cigarettes smoked per day on average to examine the impact of cigarette prices, clean indoor air laws, and campus-level smoking policies on the smoking behaviors of a 1997 cross section of college students. The results of the analysis indicate that higher cigarette prices are associated with lower smoking participation and lower levels of use among college student smokers. Local- and state-level clean indoor air restrictions have a cumulative impact on the level of smoking by current smokers. Complete smoking bans on college campuses are associated with lower levels of smoking among current smokers but have no significant impact on smoking participation. Bans on cigarette advertising on campus as well as bans on the sale of cigarettes on campus have no significant effect on the smoking behavior of college students. [source] GLOBAL HEALTH ETHICS FOR STUDENTSDEVELOPING WORLD BIOETHICS, Issue 1 2009ANDREW D. PINTO ABSTRACT As a result of increased interest in global health, more and more medical students and trainees from the ,developed world' are working and studying in the ,developing world'. However, while opportunities to do this important work increase, there has been insufficient development of ethical guidelines for students. It is often assumed that ethics training in developed world situations is applicable to health experiences globally. However, fundamental differences in both clinical and research settings necessitate an alternative paradigm of analysis. This article is intended for teachers who are responsible for preparing students prior to such experiences. A review of major ethical issues is presented, how they pertain to students, and a framework is outlined to help guide students in their work. [source] STUDENTS, PERCEPTIONS OF WORKSHOP BASED INTRODUCTORY MACROECONOMICS TUTORIALS: A SURVEYECONOMIC PAPERS: A JOURNAL OF APPLIED ECONOMICS AND POLICY, Issue 3 2006AMEETA JAIN The declining popularity of Economics courses, evident in the last decade, has fuelled a debate on the nature of Economics units and the way in which they are taught in tertiary institutions. The effectiveness of traditional teaching methods has been questioned as ,lecturers search for alternative ways of presenting material and engaging students. In recent times, workshop-based/cooperative tutorials have become more popular in promoting deeper learning. This paper assesses the application of such an approach at a large tertiary institution. It evaluates student perceptions of this tutorial method in an Introductory Macroeconomics first-year unit. An anonymous questionnaire was used. Whilst the sample size is small (n = 56), the results are important in that this is the first such study in Macroeconomics. Students found workshop-based tutorials useful, preferred them over lecture style tutorials, and found that they fostered inclusivity. The importance of tutorials per se, is reiterated. Students state that tutorials are an important adjunct to lectures. This study also looks at students' study habits: finding that on average they spend less than one hour per week studying Economics and most prepare only occasionally for tutorials. The sample studied indicates that there are notable differences in the perceptions of tutorials and teaching methods between the genders and between local and international students. This may impact on the way in which tutorials are conducted effectively. [source] WHAT BUSINESS STUDENTS THINK OF ECONOMICS: RESULTS FROM A SURVEY OF SECOND YEAR STUDENTSECONOMIC PAPERS: A JOURNAL OF APPLIED ECONOMICS AND POLICY, Issue 1 2002PAUL AZZALINI First page of article [source] RESOURCE FOR STUDENTS OF PROHIBITION AND THE AMERICAN TEMPERANCE MOVEMENTADDICTION, Issue 5 2005Article first published online: 22 APR 200 No abstract is available for this article. [source] MAKING EVOLUTION RELEVANT AND EXCITING TO BIOLOGY STUDENTSEVOLUTION, Issue 6 2007David M. Hillis First page of article [source] PERCEPTION OF IRRADIATED FOODS AMONG STUDENTS (SECONDARY, UNIVERSITY [FOOD SCIENCE AND NONFOOD SCIENCE]) AND ADULTS IN ARGENTINAJOURNAL OF FOOD PROCESSING AND PRESERVATION, Issue 3 2008ALEJANDRA FLORES ABSTRACT A survey on beliefs and purchase intent of irradiated foods was conducted among 300 Argentine students, covering secondary/high school, food science and nonfood science university, and 100 nonstudent adults. Other factors considered were the type of information provided (introductory, process description and benefits) and the city of residence (small agricultural city and big city). The most important benefits were considered to be microorganism reduction and improved sanitation. On the other hand, insecurity and doubts were the main reasons why respondents would not buy these foods. Only 14% said they would definitely buy irradiated foods. Considering their doubts and insecurities, it is probable that if these respondents see a food labeled as "irradiated," they would not choose to buy it. Within developing countries such as Argentina, the promotion of this technology by government agencies would be very costly, and at present, these costs would not seem to be justified. PRACTICAL APPLICATIONS The negative perceptions of consumers would hinder the successful implementation of food irradiation. The doubts or insecurities that consumers of developing countries have are similar to those that consumers of developed countries have. Most respondents answered that irradiated foods should be labeled as such. If food irradiation was to be pursued further, the place to start would be in food science curricula as this is the basis of future professionals in charge of researching its use and/or implementing the process. [source] A DISMANTLING TRIAL OF MOTIVATIONAL INTERVIEWING AND FEEDBACK AMONG HEAVY DRINKING COLLEGE STUDENTSALCOHOLISM, Issue 2008ST Walters Motivational Interviewing (MI) is a brief intervention that has been shown to reduce heavy drinking among college students. To date, all college studies of MI (and most adult studies) have used an intervention format that includes a feedback profile delivered in an MI style. This presentation will discuss the results of a dismantling trial of motivational interviewing, and feedback among heavy drinking college students. After an initial screen, 350 heavy drinking students were randomized to: (1) MI with feedback, (2) MI without feedback, (3) Web feedback only, (4) Assessment only, or (5) Delayed assessment only. At 6 months, only MI with feedback showed an effect over control in reducing drinks per week, peak BAC, and drinking related consequences. Neither MI nor feedback alone had an effect over assessment. Drinking severity moderated the effect of the interventions. [source] DISABILITY LESSONS IN HIGHER EDUCATION: ACCOMMODATING LEARNING-DISABLED STUDENTS AND STUDENT-ATHLETES UNDER THE REHABILITATION ACT AND THE AMERICANS WITH DISABILITIES ACTAMERICAN BUSINESS LAW JOURNAL, Issue 1 2003Susan M. Denbo [source] ACADEMIC ACHIEVEMENT OF STUDENTS IN FOSTER CARE: IMPEDED OR IMPROVED?PSYCHOLOGY IN THE SCHOOLS, Issue 5 2004Larry D. Evans Foster care's impact on academic development was investigated for 392 students reentering foster care. Psychoeducational evaluation was performed at initial and return placements. Average achievement increased .22 points between placements. Students reentering care did not show differences in achievement or IQ compared to control students with a single placement. Although average achievement showed a small increase between placements, some students showed large changes. Declining achievement was directly related to above-average initial achievement ( p < .001), and indirectly related to not being in special education ( p < .001) and nonminority race ( p < .02). Results provide evidence that overall academic development appears neither enhanced nor hindered by foster care placement, but specific groups may be at risk for poor gains. © 2004 Wiley Periodicals, Inc. Psychol Schs 41: 527,535, 2004. [source] CLINICAL ANATOMY: APPLIED ANATOMY FOR STUDENTS AND JUNIOR DOCTORS.ANZ JOURNAL OF SURGERY, Issue 10 200711th EDITION - BY HAROLD ELLIS No abstract is available for this article. [source] THE PROMOTION OF HEALTH CAREERS TO HIGH SCHOOL STUDENTS IN THE NEW ENGLAND HEALTH AREA: THE VIEWS OF HIGH SCHOOL CAREERS ADVISERSAUSTRALIAN JOURNAL OF RURAL HEALTH, Issue 4 2001Christian Alexander ABSTRACT: One way to impact positively on the shortage of health professionals in rural areas is to effectively promote health careers to rural high school students. Rural high school careers advisers play a pivotal role in this. In order to assess how rural health careers advisers working in the north-west of New South Wales currently promote health careers to their students, the New England Area Rural Training Unit carried out a survey of the area's high school careers advisers. Of the 47 high school careers advisers, 38 returned completed questionnaires, yielding a response rate of 81%. While only about one-third of careers advisers use visits by undergraduate students enrolled in tertiary health courses (42%), visits by locally practising health professionals (39%) and/or health careers site visits (27%), all careers advisers consider such promotional activities to be most effective. Improved exposure to such effective health career promotional activities for the area's high school, increasing collaboration between careers advisers and health professionals, as well as renewed efforts to identify and to foster interested students prior to Year 10, should lead to an increasing number of rural high school students enrolling in tertiary health courses. [source] EFFECT OF A SOYBEAN PRODUCT ON SERUM LIPID LEVELS IN FEMALE UNIVERSITY STUDENTSCLINICAL AND EXPERIMENTAL PHARMACOLOGY AND PHYSIOLOGY, Issue 2004Kyoko Takahashi SUMMARY 1.,A dietary intervention study targeting female students by using cake containing soybean protein and isoflavone was conducted. Female students (n = 120) were divided into three Groups (A, 6.26 g of soybean protein and isoflavone at 50 mg/day; B, 1.36 g soybean protein and isoflavone 50 mg; and C, a wheat puff as placebo). Intervention period was 4 weeks. The ratio of hypercholesterol in each group indicated a high value; A: 25%, B: 17.9% and C: 24.4%. 2.,Total cholesterol as well as the rate of hypercholesterolemia decreased in Group A. The average total cholesterol significantly reduced (P < 0.001) from 242 ± 17 to 220 ± 25 mg/dL in Group A. 3.,Dietary intake of soy protein for 4 weeks could be effective in reducing CHD risk among Japanese female students with a high plasma cholesterol level. [source] Enhancing Knowledge Transfer in Classroom Versus Online Settings: The Interplay Among Instructor, Student, Content, and ContextDECISION SCIENCES JOURNAL OF INNOVATIVE EDUCATION, Issue 1 2009Louise Nemanich ABSTRACT This article integrates management education and organizational learning theories to identify the factors that drive the differences in student outcomes between the online and classroom settings. We draw upon theory on knowledge transfer barriers in organizations to understand the interlinking relationships among presage conditions, deep learning process, and product in the 3P model of student learning. We test our model in the context of undergraduate education and find that confidence in the instructor's expertise, perceived content relevance, and the social richness of the classroom learning environment enhance student enjoyment of the course. Confidence in instructor's expertise and perceived content relevance also contribute to greater understanding of causal relationships among course concepts. Enjoyment is positively associated with learning performance in the classroom, but not online, and student ability is positively associated with learning performance in the online context, but not in the classroom. Our results have implications for course designs in the traditional classroom context and the more innovative online environment. [source] Learner, Student, Speaker: Why it matters how we call those we teachEDUCATIONAL PHILOSOPHY AND THEORY, Issue 5-6 2010Gert Biesta Abstract In this paper I discuss three different ways in which we can refer to those we teach: as learner, as student or as speaker. My interest is not in any aspect of teaching but in the question whether there can be such a thing as emancipatory education. Working with ideas from Jacques Rancière I offer the suggestion that emancipatory education can be characterised as education which starts from the assumption that all students can speak. It starts from the assumption, in other words, that students neither lack a capacity for speech, nor that they are producing noise. The idea of the student as a speaker is not offered as an empirical fact but as a different starting point for emancipatory education, one that positions equality at the beginning of education, not at its end. [source] From Good Student to Outcast: The Emergence of a Classroom IdentityETHOS, Issue 2 2004Stanton Wortham The process of social identification draws on heterogeneous resources from several levels of explanation. This article illustrates how, by describing the identity development of one student across an academic year in a ninth-grade classroom. Analyses of transcribed classroom conversations show teachers and students drawing on multiple resources as this student goes from being identified as one of many good students to being identified as a disruptive outcast. This case provides a counterexample to simple theories of identity development that do not recognize the multiple, heterogeneous resources involved in social identification. [source] Dentin surface treatment using a non-thermal argon plasma brush for interfacial bonding improvement in composite restorationEUROPEAN JOURNAL OF ORAL SCIENCES, Issue 5 2010Andy C. Ritts Ritts AC, Li H, Yu Q, Xu C, Yao X, Hong L, Wang Y. Dentin surface treatment using a non-thermal argon plasma brush for interfacial bonding improvement in composite restoration. Eur J Oral Sci 2010; 118: 510,516. © 2010 Eur J Oral Sci The objective of this study was to investigate the treatment effects of non-thermal atmospheric gas plasmas on dentin surfaces used for composite restoration. Extracted unerupted human third molars were prepared by removing the crowns and etching the exposed dentin surfaces with 35% phosphoric acid gel. The dentin surfaces were treated using a non-thermal atmospheric argon plasma brush for various periods of time. The molecular changes of the dentin surfaces were analyzed using Fourier transform infrared spectrophotometry/attenuated total reflectance (FTIR/ATR), and an increase in the amount of carbonyl groups was detected on plasma-treated dentin surfaces. Adper Single Bond Plus adhesive and Filtek Z250 dental composite were applied as directed. To evaluate the dentin/composite interfacial bonding, the teeth thus prepared were sectioned into micro-bars and analyzed using tensile testing. Student,Newman,Keuls tests showed that the bonding strength of the composite restoration to peripheral dentin was significantly increased (by 64%) after 30 s of plasma treatment. However, the bonding strength to plasma-treated inner dentin did not show any improvement. It was found that plasma treatment of the peripheral dentin surface for up to 100 s resulted in an increase in the interfacial bonding strength, while prolonged plasma treatment of dentin surfaces (e.g. 5 min) resulted in a decrease in the interfacial bonding strength. [source] Building Community and Posting Projects: Creating "Student Pages" in Web-Based and Web-Enhanced CoursesFOREIGN LANGUAGE ANNALS, Issue 6 2001Laura G. McGee PhD She shows how web-based student pages used for community-building activities and the presentation of culture projects contribute to meeting the five C's , Communication, Cultures, Connections, Comparisons, and Communities , as they are outlined in the 1996 ACTFL Standards for Foreign Language Learning. Based on the author's experience with web-based student pages in an online German course, this article offers models that can be applied in both web-based and web-enhanced foreign language courses. [source] A Personal Perspective from Being a Student of the Quantitative RevolutionGEOGRAPHICAL ANALYSIS, Issue 3 2008Robert J. Stimson First page of article [source] Rapid Determination of Gallamine Triethiodide (Flaxedil®) and Pancuronium Bromide (Pavulon®) in Pharmaceutical and Urine Matrices by Means of Modified-Carbon-Paste Ion-Selective ElectrodesHELVETICA CHIMICA ACTA, Issue 4 2005A new analytical method for the determination of gallamine triethiodide (Flaxedil®; 1) and pancuronium bromide (Pavulon®; 2), two muscle relaxants used in surgical operations and in pain relief, has been developed. Our approach relies on rapid, precise, and sensitive potentiometric sensors based on modified-carbon-paste ion-selective electrodes (CP-ISEs). Linear calibration graphs in the working ranges of ca. 4.5,892 and 7.3,733,,g/ml (in H2O, pH,7.0, T=25°) were established for 1 and 2, respectively; and Nernst slopes corresponding to three- or two-electrons transfers, respectively, were obtained. The method works best in a pH range of 7,9. Average relative errors of 2.12 and 2.14%, with average standard deviations of 1.98,2.47 and 2.64,3.45, respectively, were obtained for urine samples of 1 and 2. The corresponding relative errors for the pharmaceutical samples were 1.59 and 1.64%, with standard deviations of 0.54,1.34 and 0.52,1.67, respectively. Statistical Student and F tests were applied to the data, and satisfactory results were obtained. [source] The Plight of the "Able Student": Ruth Wright Hayre and the Struggle for Equality in Philadelphia's Black High Schools, 1955,1965HISTORY OF EDUCATION QUARTERLY, Issue 2 2010Matthew Delmont First page of article [source] The Making of the Victorian Campus: Teacher and Student at Amherst College, 1850,1880HISTORY OF EDUCATION QUARTERLY, Issue 3 2002J.M. Opal First page of article [source] Further examination of the convergent and discriminant validity of the student,teacher relationship scaleINFANT AND CHILD DEVELOPMENT, Issue 6 2009Sarah Doumen Abstract Two studies extended psychometric research on the Student,Teacher Relationship Scale (STRS) with kindergarten and preschool children (N1 = 60,71; N2 = 35) and their teachers. These studies used a multi-method approach to replicate and extend previous findings concerning the convergent validity of the STRS Closeness, Conflict, and Dependency scale and to further examine the discriminant validity of the STRS. Study 1 investigated convergence between the STRS scales and child- and peer-reports of the same constructs based on a multi-trait multi-method approach. Study 2 examined the pattern of associations between the STRS and indicators of teacher,child relationship quality rated by external observers. Support was found for the convergent validity and to a lesser extent the discriminant validity of the STRS Closeness and Conflict scale. For the STRS Dependency scale, additional research remains necessary. Copyright © 2009 John Wiley & Sons, Ltd. [source] Solubility of root-canal sealers in water and artificial salivaINTERNATIONAL ENDODONTIC JOURNAL, Issue 10 2003E. Schäfer Abstract Aim, To compare the weight loss of eight different root-canal sealers in water and in artificial saliva with different pH values. Methodology, For standardized samples (n = 12 per group), ring moulds were filled with epoxy resin (AH 26, AH Plus)-, silicone (RSA RoekoSeal)-, calcium hydroxide (Apexit, Sealapex)-, zinc oxide,eugenol (Aptal-Harz)-, glass-ionomer (Ketac Endo)- and polyketone (Diaket)-based sealers. These samples were immersed in double-distilled water or artificial saliva with different pH values (7.0, 5.7 and 4.5) for 30 s, 1 min, 2 min, 5 min, 10 min, 20 min, 1 h, 2 h, 10 h, 24 h, 48 h, 72 h, 14 days and 28 days. Mean loss of weight was determined and analysed statistically using a one-way anova and Student,Newman,Keuls test for all pairwise comparisons. Results, Most sealers were of low solubility, although Sealapex, Aptal-Harz and Ketac Endo showed a marked weight loss in all liquids. Even after 28 days of storage in water, AH 26, AH Plus, RSA RoekoSeal, and Diaket showed less than 3% weight loss. At exposure times greater than 14 days, Sealapex showed the significantly greatest weight loss of all sealers tested (P < 0.05). Aptal-Harz and Ketac Endo were significantly more soluble in saliva (pH 4.5) than in water (P < 0.05). Conclusions, Under the conditions of the present study, AH Plus showed the least weight loss of all sealers tested, independent of the solubility medium used. Sealapex, Aptal-Harz and Ketac Endo had a marked weight loss in all liquids. [source] Diagnosis of peripheral arterial disease in general practice: can the ankle,brachial index be measured either by pulse palpation or an automatic blood pressure device?,INTERNATIONAL JOURNAL OF CLINICAL PRACTICE, Issue 7 2008V. Aboyans Summary Background:, Despite its validity as a screening test for peripheral arterial disease (PAD), and its prognostic value, the ankle,brachial index (ABI) is infrequently used in primary care, probably because a Doppler device is required, along with the requisite skill for its use. We hypothesized that ABI could be accurately measured either by pulse palpation (pABI) or automatic blood pressure devices (autoABI) instead of Doppler method (dABI). Design and methods:, In 54 subjects, we compared the results and the intra-observer reproducibility of pABI to dABI, as well as the inter-observer reproducibility of both pABI and autoABI to dABI. Arm and ankle systolic pressures were measured by the three methods by two observers. The first observer repeated pABI and dABI measurements. The results were compared by the Student paired t -test. Reproducibility was assessed by the intra-class correlation coefficient of agreement (R) and the Bland and Altman method. Results:, The mean dABI obtained by the first observers was 1.03 ± 0.26 vs. a pABI of 0.85 ± 0.44 (p < 0.0001) and an autoABI of 1.09 ± 0.31 (p < 0.05). The intra-observer R -coefficient was at 0.89 for dABI vs. 0.60 for pABI (p < 0.05). The inter-observer R -coefficients were 0.79 for dABI vs. 0.40 for pABI (p < 0.05) and 0.44 for autoABI (p < 0.05). Conclusion:, Neither pulse palpation nor automatic oscillometric devices can be recommended as reliable methods for ABI measurement. [source] Forecasting financial volatility of the Athens stock exchange daily returns: an application of the asymmetric normal mixture GARCH modelINTERNATIONAL JOURNAL OF FINANCE & ECONOMICS, Issue 4 2010Anastassios A. Drakos Abstract In this paper we model the return volatility of stocks traded in the Athens Stock Exchange using alternative GARCH models. We employ daily data for the period January 1998 to November 2008 allowing us to capture possible positive and negative effects that may be due to either contagion or idiosyncratic sources. The econometric analysis is based on the estimation of a class of five GARCH models under alternative assumptions with respect to the error distribution. The main findings of our analysis are: first, based on a battery of diagnostic tests it is shown that the normal mixture asymmetric GARCH (NM-AGARCH) models perform better in modeling the volatility of stock returns. Second, it is shown that with the use of the Kupiec's tests for in-sample and out-of-sample forecasting performance the evidence is mixed as the choice of the appropriate volatility model depends on the trading position under consideration. Third, at the 99% confidence interval the NM-AGARCH model with skewed Student-distribution outperforms all other competing models both for in-sample and out-of-sample forecasting performance. This increase in predictive performance for higher confidence intervals of the NM-AGARCH model with skewed Student-distribution makes this specification consistent with the requirements of the Basel II agreement. Copyright © 2010 John Wiley & Sons, Ltd. [source] Visuospatial impairment in dementia with Lewy bodies and Alzheimer's disease: a process analysis approachINTERNATIONAL JOURNAL OF GERIATRIC PSYCHIATRY, Issue 5 2003Martine Simard Abstract Background Reports of differential impairments on visual-construction tasks in dementia with Lewy bodies (DLB) and Alzheimer's disease (AD) are sometimes controversial, whereas visual-perceptual data are lacking. The existence of different clinical sub-groups of DLB has been hypothesized to explain the discrepancies among the cognitive results. The goal of this study was to compare the visual-perceptual performance of subjects with DLB with predominant psychosis, DLB with predominant parkinsonian features and AD. Methods This is a cross-sectional neuropsychological study with between diagnostic group comparisons. The Benton Judgement Line Orientation (BJLO) test was administered to four DLB patients with predominant psychosis (DLB-psy), four DLB subjects with predominant parkinsonian features (DLB-PD), and 13 patients with AD. An analysis of error types was applied to the results of the BJLO with QO1, QO2, QO3, QO4 (visual attention) errors, as well as VH, IQO, IQOV, and IQOH (visual-spatial perception) errors. Results A MANOVA showed significant differences between the DLB, and AD groups on the number of VH (F,=,6.049, df,=,1,19, p,=,0.024), IQOH (F,=,4.645, df,=,1,19, p,=,0.044) and QO1 (F,=,4.491, df,=,1,19, p,=,0.047) errors, but no difference on the total score of the BJLO. Another MANOVA and post hoc Student,Newman,Keuls analyses demonstrated that the DLB-psy sub-group made significantly more VH and IQOH errors than AD and the DLB-PD subjects. Conclusions Subjects with DLB and psychosis have more severe visual-perception (VH errors) impairments than subjects with DLB and predominant parkinsonian features, and AD subjects. Copyright © 2003 John Wiley & Sons, Ltd. [source] Effect of disinfection by microwave irradiation on the strength of intact and relined denture bases and the water sorption and solubility of denture base and reline materialsJOURNAL OF APPLIED POLYMER SCIENCE, Issue 1 2008Rosangela Seiko Seó Abstract This study evaluated the influence of microwave disinfection on the strength of intact and relined denture bases. Water sorption and solubility were also evaluated. A heat-polymerized acrylic resin (Lucitone 550) was used to construct 4-mm-thick (n = 40) and 2-mm-thick (n = 160) denture bases. Denture bases (2-mm) were relined with an autopolymerizing resin (Tokuso Rebase Fast, Ufi Gel Hard, Kooliner, or New Truliner). Specimens were divided into four groups (n = 10): without treatment, one or seven cycles of microwave disinfection (650 W for 6 min), and water storage at 37°C for 7 days. Specimens were vertically loaded (5 mm/min) until failure. Disc-shaped specimens (50 mm × 0.5 mm) were fabricated (n = 10) to evaluate water sorption and solubility. Data on maximum fracture load (N), deflection at fracture (mm), fracture energy (N mm), water sorption (%), and solubility (%) were analyzed by two-way analysis of variance and Student,Newman,Keuls tests (, = 0.05). One cycle of microwave disinfection decreased the deflection at fracture and fracture energy of Tokuso Rebase Fast and New Truliner specimens. The strength of denture bases microwaved daily for 7 days was similar to the strength of those immersed in water for 7 days. Microwave disinfection increased the water sorption of all materials and affected the solubility of the reline materials. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 [source] Biocompatibility of various formula root filling materials for primary teethJOURNAL OF BIOMEDICAL MATERIALS RESEARCH, Issue 2 2007Tsui-Hsien Huang Abstract The aim of this study was to compare the effects of different materials used in primary root canal fillings on the cell viability of human osteosarcoma cell lines. The experimental group contained six different types of root canal filling materials, including zinc oxide (ZnO) + eugenol + formocresol (FC), Ca(OH)2 + FC, Ca(OH)2 + Iodoform, Ca(OH)2 + Iodoform + camphorated parachlorophenol (CPC), Ca(OH)2 + CPC, and Vitapex. Cell viability tests were performed using tetrazolium bromide colorimetric (MTT) assay on human osteosacorma cell lines (U2OS). The results were analyzed using one-way analysis of variance (ANOVA) and Student,Newman,Keul's test with p < 0.05 showed statistical differences. The ZnO + eugenol + FC group and Ca(OH)2 + FC group showed the lowest survival rates (p < 0.05). The Ca(OH)2 + Iodoform + CPC group and Ca(OH)2 + CPC group showed significantly lower survival rates at concentrations above 6 ,L/mL (p < 0.05). The Ca(OH)2 + Iodoform group and Vitapex group showed the highest survival rates (p < 0.05). We concluded that the use of calcium hydroxide with iodoform as a root filling base material is a better option than other medications. © 2006 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2007 [source] | ||||||||||||||||||||||||||||||||||||||||||||||