Avaliação da resistência à fratura e tensões em diferentes implantes e conexões protéticas: Análise in vitro e MEF-3D

Pós-graduação em Odontologia - FOA

Avaliação das características geométricas, dimensionais, de flexibilidade e resistência torcional dos instrumentos de NiTi do Sistema Pro Taper Universal para retratamento

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Estudo comparativo in vivo e in vitro da resistência ao cisalhamento de braquetes metálicos colador com resina polimerizada com luz halógena e LEd

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Caracterização parcial e desenvolvimento de oligonucleotídeos específicos para detecção de sequivírus infectando alface

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Estudos sobre a relação entre disfunção temporomandibular e cefaléia primária: avaliações populacional e clínica

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

O racismo como questão epistemológica: uma interpretação do discurso religioso evolucionista da Igreja Universal do Reino de Deus

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Fontes para o estudo do Neopentecostalismo brasileiro: O caso da Igreja Universal do Reino de Deus

Denomina-se Neopentecostalismo o movimento religioso que se configurou no Brasil, na década de 1970, como uma ramificação do chamado Pentecostalismo clássico, surgido nos Estados Unidos da América, no início do século XX. Para a pesquisa do tema proposto, adotam-se como principais fontes as literaturas neopentecostais, matérias jornalísticas da mídia impressa, depoimentos de líderes e fiéis, observações presenciais e programas veiculados pela mídia. Utilizam-se como referencial teórico-metodológico, parâmetros da Nova História Cultural, priorizando-se os conceitos de apropriação, circulação cultural, habitus, imaginário e longa duração. Da análise aqui empreendida, constata-se que a leitura da Bíblia exerce um papel preponderante nas práticas deste segmento religioso ao orientar o comportamento coletivo e configurar um fertilíssimo passado cultural. Na magia dos ritos e na riqueza símbólica ali adotados, percebe-se um substrato cultural legado das crenças afro e da religiosidade popular católica, o qual é sincreticamente re-significado a partir de elementos da tradição evangélica.

Piaget e a predicação universal

O estudo apresentado neste livro trata da relação entre Lógica e Psicologia e parte da questão apresentada na obra Ensaio de Lógica Operatória de Jean Piaget (1896-1980): [...] como se constituem as estruturas elementares de classes, de relações, de números, de proposições, etc., formalizadas com toda independência e autonomia pelo lógico e [...] quais são suas relações com as 'operações' do pensamento 'natural', muito mais pobre e não formalizado.. Os autores Rafael dos Reis Ferreira e Ricardo Pereira Tassinari observam que nessa questão, Piaget pressupõe que as operações lógico-formais estão vinculadas a um sujeito. O que interessa ao pensador francês é a compreensão de como se formam as estruturas necessárias ao conhecimento lógico-matemático e como isso é possível a partir do desenvolvimento psicológico. Eles mostram que, apesar de recorrer à Psicologia, trata-se no contexto dessa investigação de Piaget, fundamentalmente, de um interesse filosófico, relacionado à Teoria do Conhecimento e à Epistemologia, particularmente ao que o francês chama de Epistemologia Genética, e não propriamente uma investigação de pura Psicologia. A questão da relação entre Lógica e Psicologia estudada nesse livro é basicamente de como o sujeito epistêmico usa e se torna capaz de usar funções proposicionais para estruturar a realidade e produzir conhecimento sobre ela. A obra inicia-se com a contextualização do pensamento de Piaget no âmbito das discussões filosóficas e os pressupostos gerais da Epistemologia Genética e suas relações com a Psicologia Genética. O segundo capítulo é dedicado a algumas das discussões de princípios realizadas por Piaget no Ensaio, acerca do objeto e da definição da Lógica Operatória. No capítulo seguinte, os autores procuram responder à questão central do estudo, focando a análise sobre o conceito de função proposicional para Piaget e a relação desta com o ...

Comparison of Physicochemical Surface Conditioning Methods for Adhesion of bis-GMA Resin Cement to Particulate Filler Composite and Surface Characterization

This study compared the effect of physicochemical surface conditioning methods on the adhesion of bis-GMA-based resin cement to particulate filler composite (PFC) used for indirect dental restorations. PFC blocks (N (block)=54, n (block)=9 per group) were polymerized and randomly subjected to one of the following surface conditioning methods: a) No conditioning (Control-C), b) Hydrofluoric acid (HF)etching for 60s (AE60), c) HF for 90s (AE90), d) HF for 120s (AE120), e) HF for 180s (AE180), and f) air-abrasion with 30 mu m silica-coated alumina particles (AB). The conditioned surfaces were silanized with an MPS silane, and an adhesive resin was applied. Resin composite blocks were bonded to PFC using resin cement and photo-polymerized. PFC-cement-resin composite blocks were cut under coolant water to obtain bar specimens (1mmx0.8mm). Microtensile bond strength test (mu TBS)was performed in a universal testing machine (1mm/min). After debonding, failure modes were classified using stereomicroscopy. Surface characterization was performed on a set of separate specimen surfaces using Scanning Electron Microscopy (SEM), X-Ray Dispersive Spectroscopy (XDS), X-Ray Photoelectron Spectroscopy (XPS), and Fourier Transform-Raman Spectroscopy (FT-RS). Mean mu TBS (MPa) of C (35.6 +/- 4.9) was significantly lower than those of other groups (40.2 +/- 5.6-47.4 +/- 6.1) (p<0.05). The highest mu TBS was obtained in Group AB (47.4 +/- 6.1). Prolonged duration of HF etching increased the results (AE180: 41.9 +/- 7), but was not significantly different than that of AB (p>0.05). Failure types were predominantly cohesive in PFC (34 out of 54) followed by cohesive failure in the cement (16 out of 54). Degree of conversion (DC) of the PFC was 63 +/- 10%. SEM analysis showed increased irregularities on PFC surfaces with the increased etching time. Chemical surface analyses with XPS and FT-RS indicated 11-70% silane on the PFC surfaces that contributed to improved bond strength compared to Group C that presented 5% silane, which seemed to be a threshold. Group AB displayed 83% SiO2 and 17% silane on the surfaces.

Using Universal Line Model (ULM) for Representing Electromagnetic Transients in Three-Phase Transmission Lines

The second-order differential equations that describe the polyphase transmission line are difficult to solve due to the mutual coupling among them and the fact that the parameters are distributed along their length. A method for the analysis of polyphase systems is the technique that decouples their phases. Thus, a system that has n phases coupled can be represented by n decoupled single-phase systems which are mathematically identical to the original system. Once obtained the n-phase circuit, it's possible to calculate the voltages and currents at any point on the line using computational methods. The Universal Line Model (ULM) transforms the differential equations in the time domain to algebraic equations in the frequency domain, solve them and obtain the solution in the frequency domain using the inverse Laplace transform. This work will analyze the method of modal decomposition in a three-phase transmission line for the evaluation of voltages and currents of the line during the energizing process.

Wizard CD Plus and ProTaper Universal: analysis of apical transportation using new software

Objective: This study has two aims: 1) to evaluate the apical transportation of the Wizard CD Plus and ProTaper Universal after preparation of simulated root canals; 2) to compare, with Adobe Photoshop, the ability of a new software (Regeemy) in superposing and subtracting images. Material and Methods: Twenty five simulated root canals in acrylic-resin blocks (with 20 degrees curvature) underwent cone beam computed tomography before and after preparation with the rotary systems (70 kVp, 4 mA, 10 s and with the 8x8 cm FoV selection). Canals were prepared up to F2 (ProTaper) and 24.04 (Wizard CD Plus) instruments and the working length was established to 15 mm. The tomographic images were imported into iCAT Vision software and CorelDraw for standardization. The superposition of pre- and post-instrumentation images from both systems was performed using Regeemy and Adobe Photoshop. The apical transportation was measured in millimetres using Image J. Five acrylic resin blocks were used to validate the superposition achieved by the software. Student's t-test for independent samples was used to evaluate the apical transportation achieved by the rotary systems using each software individually. Student's t-test for paired samples was used to compare the ability of each software in superposing and subtracting images from one rotary system per time. Results: The values obtained with Regeemy and Adobe Photoshop were similar to rotary systems (P>0.05). ProTaper Universal and Wizard CD Plus promoted similar apical transportation regardless of the software used for image's superposition and subtraction (P>0.05). Conclusion: Wizard CD Plus and ProTaper Universal promoted little apical transportation. Regeemy consists in a feasible software to superpose and subtract images and appears to be an alternative to Adobe Photoshop.

The potential of novel primers and universal adhesives to bond to zirconia

Objectives: To investigate the adhesive potential of novel zirconia primers and universal adhesives to surface-treated zirconia substrates.Methods: Zirconia bars were manufactured (3.0 mm x 3.0 mm x 9.0 mm) and treated as follows: no treatment (C); air abrasion with 35 mu m alumina particles (S); air abrasion with 30 mu m silica particles using one of two systems (Rocatec or SilJet) and; glazing (G). Groups C and S were subsequentially treated with one of the following primers or adhesives: ZP (Z-Prime Plus), AZ (AZ Primer); MP (Monobond Plus); SU (ScotchBond Universal) and; EA (an Experimental Adhesive). Groups Rocatec and SilJet were silanized prior to cementation. Samples form group G were further etched and silanized. Bars were cemented (Multilink) onto bars of a silicate-based ceramic (3.0 mm x 3.0 mm x 9.0 mm) at 90 degrees angle, thermocycled (2.500 cycles, 5-55 degrees C, 30 s dwell time), and tested in tensile strength test. Failure analysis was performed on fractured specimens to measure the bonding area and crack origin.Results: Specimens from group C did not survive thermocycling, while CMP, CSU and CEA groups survived thermocycling but rendered low values of bond strength. All primers presented a better bond performance after air abrasion with Al2O3 particles. SilJet was similar to Rocatec, both presenting the best bond strength results, along with SMP, SSU and CEA. G promoted intermediate bond strength values. Failure mode was predominately adhesive on zirconia surface combined to cohesive of the luting agent.Conclusions: Universal adhesives (MP, SU, EA) may be a considerable alternative for bonding to zirconia, but air abrasion is still previously required. Air abrasion with silica particles followed by silane application also presented high bond strength values. (C) 2013 Elsevier Ltd. All rights reserved.