955 resultados para SCIENTIFIC JOURNAL
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Ciência da Informação - FFC
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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The intense valuation of an esthetic pleasant smile guided the dentistry to bleached tooth due the popularity of whitening treatments. The consequence of it is an increasing interest in searching the effect of peroxides in hard dental tissues. The aim of this work was to analyze qualitatively in vitro the human enamel after three different bleaching treatments: Opalescence PF 10%, White Class 7.5% and Opalescence Xtra Boost 38%, correlating the structural changes in the surface of the enamel with its respective pH. A total of 40 sound human pre-molars were randomly divided into four groups of 10 elements, which had been immersed in artificial saliva during all the experiment. Bleaching protocols followed the recommendations of the respective manufacturers. Each bleached sample and control group were submitted to a scanning electronic microscopy analysis and compared with one another. Bleaching agents used in this experiment had modified the morphologic aspect of the surface of the dental enamel; however, it did not have correlation between the degrees of severity of the alterations and pH. There is a correlation between hydrogen peroxide concentration and changes in the enamel, where G4 showed more severe alterations, followed for G3 and G2.
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Patients are seeking increasingly the expertise of dental surgeons for esthetic dental improvement. The dental surgeons should know the restorative materials and techniques in order to optimize the clinical practice and to obtain satisfactory results. Also the dentist should know the average heights and widths of the anterior teeth to detect the esthetic disharmony and to eliminate it for reproducing the correct dental anatomy. Thus, this study aimed to describe a clinical case report of direct restoration using the palatal barrier technique.
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Hidden caries is a type of lesion visualized in dentin, mainly by means of bitewing radiographs, in which, clinically, the occlusal enamel appears healthy or minimally demineralized and radiographically presents progressive demineralization in dentin, which may progress and compromise the pulp-dentin complex. Although the etiology of hidden caries is unknown, many theories have been studied, including structural and anatomical defects of enamel, their specific microbiota and the use of fluoride, which is most accepted theory. Considering the clinical concern, since these lesions have a silent progression and often are not detected on routine clinical examinations, this study aims to conduct a critical discussion of the etiology, prevalence, diagnostic methods and treatment decision for lesions of hidden caries, alerting professionals about the importance of routine use of bitewing radiographs even in patients considered “cariesfree” or low risk of caries, for more effective diagnosis.
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Objective: The purpose of this study was to evaluate the influence of the addition of 2% chlorhexidine digluconate (CHX) associated with 5% calcium chloride (CaCl2 ) on antimicrobial activity, setting time, pH and calcium release of gray mineral trioxide aggregate (GMTA). Materials and Methods: GMTA powder was mixed with water, 2% CHX alone or 2% CHX combined with 5% CaCl2 . Antimicrobial activity was determined against Enterococcus faecalis (ATCC 29212) strains by agar diffusion test. Data obtained were submitted to kruskal wallis tests. Analysis of the setting time was evaluated by American society for testing and materials C266-03 requirements. The pH and calcium release analysis were evaluated, in 24 h, 7, 14 and 28 days using pH meter equipment and atomic absorption spectrophotometer, respectively. Data obtained were analyzed by ANOVA, in 5% significance level. Results: Significant differences were seen (P < 0.01) among the zones of bacterial growth inhibition produced by 5% CaCl2 + 2% CHX combination against E. faecalis when compared with water (P < 0.05). Regarding the setting time, that combination had the shortest setting time (P < 0.05). All associations were alkaline and released calcium. No statistical difference was observed between the experimental groups at the different periods of analysis (P > 0.05). Conclusion: Combination of 5% CaCl2 + 2% CHX reduced the setting time and enhanced the antimicrobial activity of GMTA without changing the pH and calcium release.
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This case report presents an apical radicular perforation management using new calcium silicate-based cement (Biodentine) in a combined endodontic-periodontal lesion. The presence of apical radicular perforation may interfere in the endodontic treatment prognosis. Radicular perforation filling with bioactive cement through endodontic surgery is a possible treatment. This study presents an apical radicular perforation with periodontal involvement, due to alveolar bone loss on the buccal radicular surface from an incorrect intracanal preparation for the fiber post placing. The chosen alternative was a periapical surgery, the perforation was filled with a silicate and calcium chloride bioactive cement (Biodentine; Septodont, Saint-Maur-des-Fosses Cedex, France), and the radicular surface was etched with citric acid, because the access from root canal was impossible. The follow-up was for 8 months, through clinical and radiographic analysis. At the end of the follow-up, radiographic analyses showed the bone healing, and no clinical changes in periodontal probing depth, gingival recession, and the height of the interproximal mesial and distal papillae were observed. The root perforation treatment has a difficult management, especially when the dental root has a simultaneous periodontal commitment. The Biodentine proves to be a promising material for use in these situations.
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This is a reflection upon 17 years of experience in the production of an interdisciplinary scientific journal, the publication “Interface: Communication, Health, Education,” whose scope is in the fields of Collective (Public) Health, Education and Communication. It also examines retrospectively the themes published by the journal, seeking to identify them in different sections of this publication. Finally, the evolution of the journal is analyzed.
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Psicologia: Ciência e Profissão (PCP), publicada pelo Conselho Federal de Psicologia ao longo de 30 anos, registra o avanço da Psicologia, como ciência e profissão. O objetivo deste trabalho é relatar alguns aspectos que merecem destaque, a partir de 2005, quando PCP se consolida como uma revista científica, ganha a versão digital e se insere no movimento do acesso aberto. É feita também uma breve análise dos indicadores de citações da revista. As análises foram efetuadas a partir da leitura dos editoriais dos fascículos publicados do ano 2005 até o momento. Com base nos módulos de bibliometria do PePSIC e SciELO, além dos dados das referências da revista, foram levantados indicadores de citações recebidas e fornecidas por PCP. Os dados permitem afirmar que PCP vem aumentando o número de citações recebidas. A rede de revistas que mais citam PCP está publicada no PePSIC, demonstrando que publicações eletrônicas ganham maior visibilidade na comunidade científica. Ao completar 30 anos, a proposta da revista é o comprometimento com a Psicologia voltada para aliviar o sofrimento humano, mas também dedicada ao avanço da ciência psicológica. O conhecimento documentado em revistas científicas e o impacto que tais publicações representam para o saber universal é algo que deve ser abordado, discutido e entendido, assim, estudos dessa natureza devem ser incentivados.
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The aim of the present work is a historical survey on Gestalt trends in psychological research between late 19th and the first half of 20th century with privileged reference to sound and musical perception by means of a reconsideration of experimental and theoretical literature. Ernst Mach and Christian von Ehrenfels gave rise to the debate about Gestaltqualität which notably grew thanks to the ‘Graz School’ (Alexius Meinong, Stephan Witasek, Anton Faist, Vittorio Benussi), where the object theory and the production theory of perception were worked out. Stumpf’s research on Tonpsychologie and Franz Brentano’s tradition of ‘act psychology’ were directly involved in this debate, opposing to Wilhelm Wundt’s conception of the discipline; this clearly came to light in Stumpf’s controversy with Carl Lorenz and Wundt on Tondistanzen. Stumpf’s concept of Verschmelzung and his views about consonance and concordance led him to some disputes with Theodor Lipps and Felix Krueger, lasting more than two decades. Carl Stumpf was responsible for education of a new generation of scholars during his teaching at the Berlin University: his pupils Wolfgang Köhler, Kurt Koffka and Max Wertheimer established the so-called ‘Berlin School’ and promoted the official Gestalt theory since the 1910s. After 1922 until 1938 they gave life and led together with other distinguished scientists the «Psychologische Forschung», a scientific journal in which ‘Gestalt laws’ and many other acoustical studies on different themes (such as sound localization, successive comparison, phonetic phenomena) were exposed. During the 1920s Erich Moritz von Hornbostel gave important contributions towards the definition of an organic Tonsystem in which sound phenomena could find adequate arrangement. Last section of the work contains descriptions of Albert Wellek’s studies, Kurt Huber’s vowel researches and aspects of melody perception, apparent movement and phi-phenomenon in acoustical field. The work contains also some considerations on the relationships among tone psychology, musical psychology, Gestalt psychology, musical aesthetics and musical theory. Finally, the way Gestalt psychology changed earlier interpretations is exemplified by the decisive renewal of perception theory, the abandon of Konstanzannahme, some repercussions on theory of meaning as organization and on feelings in musical experience.
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The purpose of this work is to provide a methodological tool for literature searching in geography, tourism and environmental conservation. Knowledge of bibliographic and documentary resources and learning research strategies form an essential part of training for students and researchers. Literature searching is also a critical element of communication and scientific output. This work aims to analyze the characteristics, and critical issues in geography literature searching in order to provide a critical mass of useful information to correctly prepare a search. Having addressed the issue of information literacy for the study of geography and related disciplines, including a comparison of various approaches, this work describes the physical locations of the research: libraries and archives. It outlines the issues related to the cataloging and digitization of cartographic materials. The particular characteristics of scientific communication and its primary means of dissemination, the scientific journal, are then outlined. This is followed by a description of information sources and types of documents used within the realm of geography. Tools, strategies and resources are then illustrated for conducting an effective literature search both on the web and in the library.
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En este ensayo reflexionamos sobre los desafíos tecnológicos, económicos, académicos y políticos que implica la edición científica en formato digital para los investigadores argentinos en Ciencias Sociales y Humanas. Basándonos en la trayectoria de la Facultad de Humanidades y Ciencias de la Educación de la Universidad Nacional de La Plata en la materia, proponemos que el trabajo interdisciplinario, el acceso abierto y la revisión por pares son los pilares fundamentales para llevar adelante una revista científica publicada en la web desde una unidad académica, es decir, desarrollada por el trabajo ad honorem de docentes-investigadores y sostenida económicamente con el presupuesto universitario
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En este ensayo reflexionamos sobre los desafíos tecnológicos, económicos, académicos y políticos que implica la edición científica en formato digital para los investigadores argentinos en Ciencias Sociales y Humanas. Basándonos en la trayectoria de la Facultad de Humanidades y Ciencias de la Educación de la Universidad Nacional de La Plata en la materia, proponemos que el trabajo interdisciplinario, el acceso abierto y la revisión por pares son los pilares fundamentales para llevar adelante una revista científica publicada en la web desde una unidad académica, es decir, desarrollada por el trabajo ad honorem de docentes-investigadores y sostenida económicamente con el presupuesto universitario
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En este ensayo reflexionamos sobre los desafíos tecnológicos, económicos, académicos y políticos que implica la edición científica en formato digital para los investigadores argentinos en Ciencias Sociales y Humanas. Basándonos en la trayectoria de la Facultad de Humanidades y Ciencias de la Educación de la Universidad Nacional de La Plata en la materia, proponemos que el trabajo interdisciplinario, el acceso abierto y la revisión por pares son los pilares fundamentales para llevar adelante una revista científica publicada en la web desde una unidad académica, es decir, desarrollada por el trabajo ad honorem de docentes-investigadores y sostenida económicamente con el presupuesto universitario
