Avaliação da biocompatibilidade de vidro e vitrocerâmica do sistema SNCP (SiO2-Na2O-CaO-P2O5)

Mundstock, Karoline Bastos; Oliveira, Antônio Pedro Novaes de; Hotza, Dachamir; Rogero, Sizue Ota

doi:10.1590/s0100-40422012000400002

Cited by 4 publications

(5 citation statements)

References 21 publications

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“…The results found in this study met the initial expectations based on the literature (Wang et al, 2011) (Daguano et al, 2013) (Mundstock et al, 2012). Daguano et al showed that the bioactive glass-ceramic used on this project, V775-4 from the 3CaO.P 2 O 5 -SiO 2 -MgO system, possesses whitlockite as its main crystalline phase, which favors the biocompability of the material, and is consistent with the results achieved in that study (Daguano et al, 2013).…”

Section: Discussionsupporting

confidence: 91%

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In vitro study of dentin hypersensitivity treated by whitlockite glass-ceramics

2017

Preprint

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Section: Discussionsupporting

confidence: 91%

“…The heterogeneity of the hydroxyapatite is also visible through the SEM images presented on this article. The typical morphological "cauliflower" pattern of hydroxyapatite forming on the surface of bioactive samples, as reported in the literature (Mundstock et al, 2012)was also obtained in all bioactive glasses studied in this project.…”

Section: Discussionsupporting

confidence: 80%

In vitro study of dentin hypersensitivity treated by whitlockite glass-ceramics

2017

Preprint

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“…Nestes casos, cerâmicas porosas são utilizadas devido às suas propriedades funcionais, como o baixo coeficiente de expansão térmica e condutividade térmica, bem como elevada permeabilidade e inércia química [6]. Considerando-se as particularidades específicas de cada aplicação, cerâmicas porosas são consolidadas através da utilização de diversos tipos de materiais, incluindo cordierita, mulita, carbeto de silício, alumina, zircônia parcialmente estabilizada, materiais de base de argila, alguns sistemas compósitos, bem como resíduos sólidos [7][8][9][10][11][12][13][14].…”

Section: Introductionunclassified

Resíduo industrial como matéria-prima alternativa para a produção de filtros cerâmicos refratários

et al. 2015

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ResumoO desenvolvimento de atividades de valorização de resíduos sólidos pode viabilizar a produção de produtos industriais com elevado potencial de reaproveitamento como fonte alternativa mineral. Atualmente, os resíduos sólidos industriais tornaram-se uma importante linha de pesquisa na área de Engenharia. Apesar disso, poucos estudos têm sido realizados com interação efetiva de parâmetros ambientais, econômicos e sociais que demonstram aplicações destas matérias-primas pela indústria de transformação. Neste trabalho são apresentados e discutidos os resultados de investigação relacionados à valorização de um resíduo sólido industrial (casca cerâmica) gerado no processo de fundição de precisão por cera perdida. Este material apresenta características muito interessantes e adequadas à produção de filtros cerâmicos refratários. Desta forma, cerâmicos porosos foram obtidos através do processo da réplica poliméricae o seu desempenho testado industrialmente na filtragem de ferro fundido no estado líquido (1,76 kg/s). Os componentes metálicos produzidos apresentaram excelente acabamento superficial.

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“…Como controle negativo foi utilizado uma solução de 0,1 g mL -1 de MEM em óxido de alumínio. O controle positivo foi uma solução 0,02 %v/v de fenol(MUNDSTOCK et al, 2012). Os extratos foram diluídos com o meio de cultura utilizado nas porcentagens de 100, 50, 25, 12,5, e 6,25% respectivamente.…”

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“…Em seguida, o corante foi removido, e as células foram lavadas com tampão PBS, do inglês, Phosphate-Buffered Saline solution, tampão fosfato com pH em 7,4. A lavagem foi realizada por duas vezes, para garantir a remoção do corante(MUNDSTOCK et al, 2012).…”

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Correlações entre as propriedades de transportes, térmica e a morfologia de filmes de blendas de pectina de maçã/hidrocoloide da semente da chia

Silva¹

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In this work, different formulations of polymeric blends were studied with variations of apple pectin and hydrocolloid percentages obtained from chia seeds (Salvia hispanica L.), together with additives (glycerol and glutaraldehyde). For the compositions of these formulations, a multivariate design was used, which allows the contents of both matrices and additives to vary concurrently. The samples of polymeric blends were obtained from the casting methodology, and submitted to the tensile test for identification based on the mechanical properties of the most suitable formulations studied, in relation to pure matrices. Then, based on the choice of the best formulations, a second plan was prepared, in which there was a progressive decrease in the glutaraldehyde contents. The procedure was similar to that carried out for the first planning. From the point of view of compatibility, all formulations were compatible, since there was an improvement in the results of the investigated property. The additives significantly altered the mechanical properties, resulting in a decrease in stiffness, and an increase in terms of deformation, but also especially in relation to glutaraldehyde there were changes in the extension about the crosslinking process, more evident in formulations with higher content of this additive, because, in these formulations there was an increase in the swelling content, a decrease in the gel content (insoluble content) after aqueous extraction, a decrease in the polar component of the surface energy, an increase in relation to the glass transition temperature values. From the morphological point of view, the volumetric fraction of apple pectin contributed to changes in the transport properties of water vapor, minimizing them, which becomes interesting with a view to applicability as food packaging. The formulations did not show cytotoxicity, even with high levels of glutaraldehyde. In addition, blends formulations have an antioxidant potential, estimated at approximately 60%, mainly attributed to the contribution of the chia hydrocolloid matrix. The sorption isotherms provided answers about the high sensitivity of the samples, regardless of the formulation analyzed, in relation to the water activity (aw) of the medium. Within the conditions of analysis, the formation of clusters of water molecules was maximized above aw 0.7. The data of permeation to water vapors allowed making correlations on the miscibility of the system, in lower values of volumetric fraction of apple pectin, and immiscibility for higher values, with good fit for the Maxwell model, considering the spherical geometry of this matrix. The XRD diffractograms revealed that all samples have a characteristic profile of semicrystalline materials. The formation of clusters altered the thermal properties of the samples, narrowing the endotherm profile and displacement of the thermal event to very high temperatures, whose changes were attributed to the removal of free water molecules (clusters), already when in a favorable environment the fo...

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Avaliação da biocompatibilidade de vidro e vitrocerâmica do sistema SNCP (SiO2-Na2O-CaO-P2O5)

Cited by 4 publications

References 21 publications

In vitro study of dentin hypersensitivity treated by whitlockite glass-ceramics

In vitro study of dentin hypersensitivity treated by whitlockite glass-ceramics

Resíduo industrial como matéria-prima alternativa para a produção de filtros cerâmicos refratários

Correlações entre as propriedades de transportes, térmica e a morfologia de filmes de blendas de pectina de maçã/hidrocoloide da semente da chia

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