Influência do uso do silano na resistência de união e no padrão de fratura nos reparos da resina indireta Ceramage com a resina direta Filtek Z350 / Influence of silane on bond strength and fracture pattern for indirect resin Ceramage repair with direct resin Filtek Z350

Pouca informação encontra-se disponível sobre a influência dos diferentes tratamentos de superfície das restaurações de resina indireta na resistência de união com as resinas diretas usadas para reparo. O objetivo deste estudo foi avaliar a influência de diferentes técnicas com uso do silano no reparo da resina indireta Ceramage na resistência ao cisalhamento e no padrão de fratura com a resina composta direta Filtek Z350. Blocos de resina composta indireta Ceramage (SHOFU) foram confeccionados e envelhecidos por 3 semanas em água destilada à 37°C. Posteriormente, foram jateados com óxido de alumínio e distribuídos aleatoriamente em 4 grupos de 10. No grupo 1, a superfície da resina Ceramage recebeu o adesivo convencional Adper Single Bond 2 (3M ESPE). No grupo 2 foi aplicado adesivo universal Adper Single Bond Universal (3M ESPE). Nos grupos 3 e 4, foi feita a aplicação do silano Silano Mais (Dentsply Sirona) e dos adesivos convencional e universal respectivamente. Foram confeccionados cilindros de resina composta direta Filtek Z350 (3M ESPE) na superfície da resina indireta Ceramage em todos os espécimes. Em seguida foi feito o teste de cisalhamento na máquina de teste universal (EMIC) após o armazenamento dos espécimes em água destilada à 37°C por 24 horas. O estereomicroscópio foi utilizado para analisar as falhas. A análise estatística foi feita pelo teste estatístico de Kruskal-Wallis. Não houve uma diferença estatisticamente significativa (p>0,05) na resistência de união e no padrão de fratura entre as diferentes técnicas de aplicação do silano no tratamento de superfície. Concluiu-se que o uso do silano pode não ser imprescindível para aumentar a resistência de união do reparo da resina indireta Ceramage com a resina direta Filtek Z350. No entanto, clinicamente é provável que se tenha uma maior chance de sucesso no reparo com a aplicação do silano. (AU)

Just few information is available about the influence of different surface treatments of indirect resin restorations on bond strength to direct resins used for repair. The objective of this study was to evaluate the influence of different techniques with the use of silane on the shear bond strength and fracture pattern of indirect resin Ceramage to Filtek Z350 direct composite resin. Ceramage indirect composite blocks (SHOFU) were made and aged in distilled water at 37 ° C for 3 weeks. Subsequently, they were sandblasted with aluminum oxide and randomly divided into 4 groups of 10. In group 1, the surface of the Ceramage resin received the conventional adhesive Adper Single Bond 2 (3M ESPE). In group 2, Adper Universal Bond universal adhesive (3M ESPE) was applied. In groups 3 and 4, the Silano Mais silane (Dentsply Sirona) and the conventional and universal adhesives were applied respectively. Composite resins cylinder of Filtek Z350 (3M ESPE) were made on the surface of the indirect resin Ceramage in all specimens. The shear test was then performed on the universal test machine (EMIC) after their storage in destilled water at 37°C for 24 hours. The stereomicroscope was used to analyze the fractures. Statistical analysis was done by Kruskal-Wallis test. There were no statistically significant differences (p>0,05) in bond strength values and in fracture pattern between the different techniques of application of silane in surface treatment. It was concluded that the silane coupling agent would not be necessary for repairing indirect resin Ceramage with composte resin Filtek Z350. However, clinically it is likely to have a better chance of successful repair with silane application. (AU)

Medical-purpose elastic materials based on siloxane rubbers and items made from them.

Vulcanization of the unsaturated siloxane rubbers with silicon hydrides of various structure (organohydrosiloxanes, organohydrosilazanes, organohydrosilanes) was investigated for the purpose of creating biologically-compatible materials with a high complex of medical and engineering properties. The effect of the silicon hydride structure on the vulcanization process and properties of the produced rubbers was identified. The basis sanitary and hygienic indices of rubbers were studied. A wide range of medical-purpose items was manufactured using the developed compounds.

Biological evaluation of biomaterials for cardiovascular applications: some current results.

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