Efeito de agentes clareadores caseiros sobre o conteudo mineral dos tecidos dentais

Orientador : Monica Campos SerraDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de PiracicabaResumo: O clareamento dental caseiro vem sendo cada vez mais empregado no tratamento estético de dentes com alteração de cor, por ser considerado uma alternativa conservativa e, na maioria das vezes, efetiva. Contudo, ainda existem dúvidas quanto aos efeitos dos agentes clareadores sobre a estrutura dental. Desta forma, o presente trabalho teve como objetivos: (1) avaliar a microdureza da dentina humana hígida e desmineralizada submetida ao tratamento clareador com agentes contendo peróxido de carbamida, pelo período de 42 dias e 7 e 14 dias após o término do clareamento e (2) apresentar e discutir os possíveis fatores relacionados às alterações no conteúdo mineral da estrutura dental ocorridos durante e após o tratamento clareador. Nos estudos in vitro foram utilizadas amostras de dentina radicular humana para analisar o efeito de seis agentes clareadores (Nite White Excel 2Z 10% e 22%, Opalescence 10% e 20%, Rembrandt 10% e 22%) sobre a microdureza da dentina ao longo do clareamento e no período pós-tratamento. Concluiu-se que, na dependência do agente clareador utilizado, a dentina hígida ou desmineralizada pode apresentar um aumento ou redução transitória nos valores de microdureza. Foi elaborado um artigo de revisão com o intuito de discutir o efeito da saliva, do flúor e da composição e subprodutos dos géis clareadores nas alterações do conteúdo mineral do esmalte e dentina ocorridos durante e após o clareamento caseiroAbstract: Nightguard vital bleaching has beco me the most indicated treatment for improving the esthetic appearance of discolored teeth, as it is considered conservative and effective. However, there is still some concem about the effects of these bleaching agents on dental structure. Therefore, the present study aimed to: (1) evaluate the microhardness of sound and demineralized dentin throughout the 42 days of whitening treatment and 7 and 14 days after concluding the bleaching period and (2) elucidate the possible factors related to alterations of tooth mineral content occurring during and after bleaching procedures. The in vitro studies were conducted using samples of human root dentin to analyze the effect of six whitening agents (Nite White Excel 2Z 10% and 22%, Opalescence 10% and 20%, Rembrandt 10% and 22%) on dentin microhardness during the bleaching treatment and at a post-treatment period. It was concluded that, depending on the bleaching agent applied, the sound or demineralized dentin might show an increase or transitory decrease in microhardness values. A review article was written describing the possible factors related to alterations of tooth mineral content occurring during and after bleaching proceduresMestradoDentísticaMestre em Clínica Odontológic

A tecitura intertextual em The Penelopiad, de Margaret Atwood

Dissertação (mestrado)—Universidade de Brasília, Instituto de Letras, Departamento de Teoria Literária e Literaturas, Programa de Pós-Graduação em Literatura, 2013.Margaret Atwood, ao (re)escrever A Odisséia a partir da perspectiva de Penélope na tentativa de responder à inquietação que a assombrava; “o que levou ao enforcamento das aias, e o que Penélope estava realmente tramando?”, nos faz repensar e questionar o lugar que a mulher ocupa nas grandes narrativas, sempre como objeto e nunca como sujeito. Ela também coloca sob suspeita certas hierarquias aceitas como universais. Levando em consideração o fato de a autora se apropriar de um texto clássico, para tanto, o aporte teórico utilizado se centra no conceito de dialogismo de Bakhtin, e suas reflexões sobre o gênero paródico, bem como no conceito de intertextualidade de Kristeva. Além disso, o viés de gênero que caracteriza a obra da autora demanda um aporte teórico específico, o dos estudos de gênero. ______________________________________________________________________________ ABSTRACTMargaret Atwood, when (re)writing the Odyssey from Penelope's perspective in an attempt to answer the restlessness that haunted her; "what led to the hanging of the maids, and what was Penelope really up to?" makes us rethink and question the place of women in the big narratives, always as an object and never as a subject. She also puts under suspicion certain hierarchies accepted as universal. Taking into consideration the fact that the author is appropriating a classical text, the theoretical approach focuses on the concept of dialogism by Bakhtin, and his reflections on the parody genre, as well as Kristeva’s concept of intertextuality. Moreover, the gender perspective that characterizes the work of the author demands a specific theoretical approach; gender studies

Distribución espacial de los anélidos poliquetos de fondos blandos en la ensenada de baiona (Ría de Vigo, Galicia, Noroeste de España)

The spatial distribution of the polychaete fauna in the subtidal soft-bottoms of the Ensenada de Baiona (Galicia, NW Spain) was studied by means of quantitative sampling and multivariate analyses. Several faunistic assemblages were determined, which were closely related to the sediment distribution pattern in the inlet. The coarse-medium sand fauna was mainly dominated by syllids and pisionids. Finer sediments (fine sand to mud) showed a greater abundance of deposit-feeding species, mostly spionids, cirratulids and capitellids. The greatest number of species and diversity were found in mixed sediments with medium and fine sand. Organically enriched muds around Baiona harbour have an impoverished fauna, with a high dominance of Cossura pygodactylata Jones, 1956.La distribución espacial de la fauna de poliquetos de fondos blandos submareales de la ensenada de Baiona (Galicia, NW España) ha sido estudiada mediante técnicas de muestreo cuantitativo. Los análisis multivariantes diferenciaron varias asociaciones faunísticas, que coinciden en gran medida con los patrones de distribución sedimentaria en el área estudiada. La fauna de arenas gruesas y medias está dominada principalmente por sílidos y pisiónidos, mientras que los sedimentos más finos (arenas finas a fangos) muestran una mayor abundancia de organismos depositívoros como espiónidos, cirratúlidos y capitélidos. Se han observado los mayores valores de riqueza específica y diversidad en sedimentos mixtos de arena fina y media. Los fangos orgánicamente enriquecidos del puerto de Baiona muestran una fauna empobrecida con una gran dominancia de Cossura pygodactylata. &nbsp

Patrones de distribución de la familia Syllidae (Annelida: Polychaeta) en praderas de las fanerógamas marinas Zostera marina y Zostera noltei en la ensenada de O Grove (Galicia, NO España)

This paper describes the distribution and composition of the syllid fauna inhabiting seagrass meadows in the Ensenada de O Grove (NW Spain). Samples were collected on muddy sediments colonized by either Zostera marina L., Zostera noltei Hornemann or by a mixed meadow with both species. Syllids were dominant (13340 individuals; 37% of total polychaete abundance), including 22 species (12 genera). The mixed meadows housed the highest number of species and the Z. noltei meadow had practically no syllids. The dominant species were Exogone naidina, Parapionosyllis elegans, Parexogone hebes and Prosphaerosyllis campoyi ( > 80% of total abundance). Carnivores (mainly species of Parapionosyllis, Amblyosyllis, and Streptosyllis) were dominant, especially in muddy sand with either Z. marina or Z. noltei and sandy mud with a mixed meadow. The most important abiotic variables for explaining the composition and distribution of the syllid fauna were bottom water salinity, sorting coefficient and carbonate content. The highest number of species was recorded at sites with a high salinity and carbonate content and the lowest at sites with a high sorting coefficient.El presente trabajo describe la distribución y composición de los sílidos encontrados en las praderas de fanerógamas de la Ensenada de O Grove (NO España). Los fondos fangosos estudiados están colonizados por Zostera marina L., Zostera noltei Hornemann o por ambas especies de fanerógamas. Los sílidos fueron la familia de poliquetos dominante numéricamente (13340 individuos, 37% total de la abundancia total de poliquetos) representados por 22 especies (12 géneros). Los fangos arenosos con pradera mixta albergaron el mayor número de especies de sílidos mientras que en los fondos de fango con Z. noltei estuvieron prácticamente ausentes. Las especies más abundantes fueron Exogone naidina, Parapionosyllis elegans, Parexogone hebes y Prosphaerosyllis campoyi ( > 80% abundancia total). Los carnívoros (principalmente especies de Parapionosyllis, Amblyosyllis y Streptosyllis) fueron dominantes especialmente en arenas fangosas con Z. marina o Z. noltei y en fangos arenosos con una pradera mixta. Las variables abióticas más importantes a la hora de explicar la composición y distribución de los sílidos fueron la salinidad del agua de fondo, el coeficiente de selección y el contenido en carbonatos; así, se ha encontrado un elevado número de especies en estaciones con salinidad y contenido en carbonatos más elevados, en comparación con estaciones con un mayor coeficiente de selección

Leptostracans (Crustacea: Phyllocarida) from mud volcanoes at the Gulf of Cadiz (NE Atlantic) with description of a new species of Sarsinebalia Dahl, 1985

Three leptostracan species (Crustacea: Phyllocarida) are reported from mud volcanoes at the Moroccan margin of the Gulf of Cadiz (NE Atlantic). Nebalia strausi Risso, 1826 and N. abyssicola Fage, 1929 were found in experimentally deployed organic substrates in Mercator, Meknès and Darwin mud volcanoes; N. abyssicola was also found among bathymodiolin bivalves and is recorded for the first time in the Atlantic Ocean. The third species was collected from the Gemini mud volcanoes and is described herein as Sarsinebalia ledoyeri sp. nov. The new species is characterised by having the eyes provided with ommatidia and lacking pigment, the ventral margin of the eye is concave along distal half, the antennular scale is more than twice as long as wide, the second article of the mandibular palp bears one seta on lateral surface about 0.5 times as long as the article and one subterminal seta longer than the third article, the distal article of the maxilla II endopod is about 1.8 times as long as the proximal article, the maxilla II exopod is clearly longer than the endopod proximal article, the lateral margin of the pleopod I exopod lacks setae and the posterodorsal border of pleonites VI–VII is provided with rounded to pointed denticles

Insights for the endorsement of a holistic approach for public sculpture research: the BIONANOSCULP project

This article reflects on the holistic approach for public sculpture research within the BIONANOSCULP project, focusing on the reasons behind the project development, its objectives, selected achievements and future outcomes. Focusing on one of the seven selected sculptures that were studied within the project, “Afonso de Albuquerque”, the reasons behind the selection of these public art works, their historical study, a critical assessment of their significance and conservation status are discussed. A brief description of the most significant analytical innovations of the project and insight on the future of sustainable conservation is presented.info:eu-repo/semantics/publishedVersio

fase la necesidad del encuentro

Este texto da cuenta de la relación arte, tecnología e investigación en los países latinoamericanos y cómo Fase se constituyó en un espacio de encuentro