1,720,970 research outputs found
Influence of coffee and red wine on tooth color during and after bleaching
No full textMade available in DSpace on 2019-09-12T16:57:01Z (GMT). No. of bitstreams: 0
Previous issue date: 2013Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Objective. The aim of this study was to evaluate the influence of coffee and red wine staining on tooth color during and after bleaching. Materials and methods. Blocks obtained from human molars were divided into 11 groups (n = 5) in accordance with the bleaching treatment-peroxide carbamide 10%, 15% or 20%-and in accordance with the stain therapy-coffee, wine or without staining (control). Color change analysis was performed by photo-reflectance using a spectrophotometer, during (3-times/week) and after (7, 15 and 30 days) the bleaching treatment. During the experiment, the samples were stored in artificial saliva. The results were submitted to statistical analysis with the Dunnet and Tukey tests (p 0.05) or without storage in pigment solution. After the bleaching, there were statistically significant differences between the groups treated with coffee (30th day) and wine (7th and 30th days) relative to the control, which was treated with whitening agents. Conclusion. During bleaching, remineralization of the enamel with artificial saliva and the subsequent bleaching session were effective in preventing enamel staining. After the whitening procedures, both stain therapies-coffee and wine-caused enamel color changes; however, the wine led to greater staining than did coffee.[Pini, Nubia Pavesi; Baggio Aguiar, Flavio Henrique; Lovadino, Jose Roberto] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Piracicaba, SP, Brazil[Susy Liporoni, Priscila Christiane] Universidade de Taubaté (Unitau), Dept Restorat Dent[Munin, Egberto] Univ Camilo Castelo Branco, Unicastelo, Sao Jose Dos Campos, SP, Brazil[Bovi Ambrosano, Glaucia Maria] Univ Estadual Campinas, Piracicaba Dent Sch, Dept Social Dent Stat, Piracicaba, SP, Brazi
Fourier Transform-Raman and Reflectance Studies on Dental Enamel Bleached with Hydrogen Peroxide Activated Using a Light-Emitting Diode-Laser System
No full textMade available in DSpace on 2019-09-12T16:53:48Z (GMT). No. of bitstreams: 0
Previous issue date: 2009Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Objective: To evaluate the effects of 35% hydrogen peroxide bleaching on bovine teeth using reflectance and Fourier transform (FT)-Raman spectroscopy. Background Data: Previous investigations have shown that hydrogen peroxide can modify dental components, but more studies are necessary to comprehend its effects. Materials and Methods: Forty bovine enamel fragments (4.0 x 4.0 x 4.0 mm) were divided into four experimental groups according to the hydrogen peroxide gel manufacturer's application: G1-Whiteness HP Maxx, G2-Whiteness HP, G3-Whiteform-Perox Red Form, G4-Opalescence Xtra. All groups were activated using a light-emitting diode-laser system. The bleaching treatments were performed in two sessions with a 72-h interval between sessions. The reflectance and Raman analyses of the enamel samples were performed before and after bleaching. The analyses before treatments were used as control. Results: Enamel reflectance was significantly greater after the bleaching in group G3 than in groups G1, G2, and G4 (p 0.05). Hydrogen peroxide gel caused significant reduction of the dental organics associated with type I collagen vibration only in group G3 (p < 0.05). Conclusion: Under the conditions of this study, 35% hydrogen peroxide Whiteform-Perox Red Form gel, exhibited great bleaching potential. This highly concentrated hydrogen peroxide gel significantly changed the reflectance of enamel and dental organics without significant chemical changes in enamel phosphate and carbonate content.[Rosia Cesar, Ilene Cristine] UNIVAP, Lab Biomed & Nonlinear Opt, Res & Dev Inst IP&D, BR-12244000 Sao Jose Dos Campos, SP, Brazil[Silva Soares, Luis Eduardo; Martin, Airton Abrahao] UNIVAP, Lab Biomed Vibrat Spect, Inst Res & Dev, BR-12244000 Sao Jose Dos Campos, SP, Brazil[Rosia Cesar, Ilene Cristine; Silva Soares, Luis Eduardo; Suzy Liporoni, Priscila Christiane] UNIVAP, Dept Dent, BR-12244000 Sao Jose Dos Campos, SP, Brazil[Suzy Liporoni, Priscila Christiane] Universidade de Taubaté (Unitau), Dept Restorat Dent, Sao Paulo, Brazi
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
