Fracture strength of aged monolithic and bilayer zirconia-based crowns

The purpose of this study was to evaluate the effect of design and surface finishing on fracture strength of yttria-tetragonal zirconia polycrystal (Y-TZP) crowns in monolithic (1.5 mm thickness) and bilayer (0.8 mm zirconia coping and 0.7 mm porcelain veneer) configuration after artificial aging. Bovine incisors received crown preparation and Y-TZP crowns were manufactured using CAD/CAM technique, according to the following groups (n = 10): Polished monolithic zirconia crowns (PM); Glazed monolithic zirconia crowns (GM); Bi-layer crowns (BL). Crowns were cemented with resin cement, submitted to artificial aging in a chewing simulator (2.5 million cycles/80 N/artificial saliva/37 degrees C), and tested for fracture strength. Two remaining crowns referring to PM and GM groups were submitted to a chemical composition analysis to measure the level of yttrium after aging. One-way ANOVA and Tukey's test (P = .05) indicated that monolithic zirconia crowns presented similar fracture strength (PM = 3476.2 N +/- 791.7; GM = 3561.5 N +/- 991.6), which was higher than bilayer crowns (2060.4 N +/- 810.6). There was no difference in the yttrium content among the three surfaces evaluated in the monolithic crowns. Thus, monolithic zirconia crowns present higher fracture strength than bilayer veneered zirconia after artificial aging and surface finishing does not affect their fracture strength2015COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESBEX 17246/12-1University of Toront

Synthesis and characterization of LaNixCo1-xO3 Perovskites via complex precursor methods

This work presents a study on the synthesis of LaNixCo1-xO3 perovskites via complex precursor methods. Perovskite oxides with the composition LaNixCo1-xO3 were synthesized by chelating precursor and polymeric precursor methods using nickel and/or cobalt nitrates, lanthanum nitrate, ethylene glycol, citric acid, and EDTA as starting source. The obtained perovskite were characterized by thermogravimetric analysis, infrared spectroscopy, X-ray diffraction and the morphology of the samples were investigated by N2 adsorption experiments and average medium particle size. TG curves and FTIR spectra were particularly useful in establishing of the optimal calcination temperature of the precursor powders. X-ray diffraction patterns revealed the formation of the perovskite structure in all samples prepared by both synthesis method and after calcinations at 700℃. The results showed that the preparation method resulted in oxides with the intended structure. The specific surface area values were influenced by preparation method

Neighbourhood-level income and Zika virus infection during pregnancy in Recife, Pernambuco, Brazil: an ecological perspective, 2015-2017.

Zika virus (ZIKV) infections during pregnancy can lead to adverse neurodevelopmental and clinical outcomes in congenitally infected offspring. As the city of Recife in Pernambuco State, Brazil-the epicentre of the Brazilian microcephaly epidemic-has considerable disparities in living conditions, this study used an ecological approach to investigate the association between income at the neighbourhood level and the risk of ZIKV infections in pregnant individuals between December 2015 and April 2017. The spatial distribution of pregnant individuals with ZIKV infection was plotted on a map of Recife stratified into four categories based on mean monthly income of household heads. Additionally, a Poisson regression model with robust variance was fitted to compare proportions of ZIKV infections among pregnant individuals in relation to the mean monthly income of household heads, based on the 2010 census data, across 94 neighbourhoods in Recife. The results provide evidence that the risk of ZIKV infection to pregnant individuals was higher among those residing in lower-income neighbourhoods: relative to neighbourhoods that had a mean monthly income of ≥5 times minimum wage, neighbourhoods with <1 and 1 to <2 times minimum wage had more than four times the risk (incidence rate ratio, 95% CI 4.08, 1.88 to 8.85 and 4.30, 2.00 to 9.20, respectively). This study provides evidence of a strong association between neighbourhood-level income and ZIKV infection risks in the pregnant population of Recife. In settings prone to arboviral outbreaks, locally targeted interventions to improve living conditions, sanitation, and mosquito control should be a key focus of governmental interventions to reduce risks associated with ZIKV infections during pregnancy

A One-Dimensional (1-D) Three-Region Model for a Bubbling Fluidized-Bed Adsorber

A general one-dimensional (1-D), three-region model for a bubbling fluidized-bed adsorber with internal heat exchangers has been developed. The model can predict the hydrodynamics of the bed and provides axial profiles for all temperatures, concentrations, and velocities. The model is computationally fast and flexible and allows for any system of adsorption and desorption reactions to be modeled, making the model applicable to any adsorption process. The model has been implemented in both gPROMS and Aspen Custom Modeler, and the behavior of the model has been verified

PESQUISAS DESENVOLVIDAS NO PROGRAMA DE PÓS-GRADUAÇÃO EM GERONTOLOGIA DA UNIVERSIDADE FEDERAL DE SÃO CARLOS E SUA IMPORTÂNCIA NO CONTEXTO DO ENVELHECIMENTO

Esta revisão narrativa tem como objetivo apresentar e discutir a relevância dos estudos desenvolvidos no Programa de Pós-Graduação em Gerontologia da Universidade Federal de São Carlos (PPGGero/UFSCar). Os dados foram coletados na disciplina “Seminários Avançados em Gerontologia”, em que os docentes autores apresentaram suas linhas de pesquisa, as quais foram compiladas pelos discentes autores. Os resultados desta revisão apresentam os estudos realizados em um programa interdisciplinar de mestrado acadêmico que possui duas linhas de pesquisa denominadas: 1) Saúde, Biologia e Envelhecimento; e 2) Gestão, Tecnologia e Inovação em Gerontologia. Os estudos se inserem em diversas temáticas da área do envelhecimento, que se articulam entre ambas as linhas de pesquisa do programa. Na linha 1 destacam-se estudos relacionados à cognição, à demência e suas consequências aos pacientes e cuidadores, bem como a pesquisas relacionadas ao seu diagnóstico e cuidado. Destacam-se também pesquisas epidemiológicas e aquelas relacionadas a condições ou doenças comuns no envelhecimento, como dor crônica, osteoartrite e, mais recentemente, a infecções em idosos, incluindo a COVID-19. Na linha 2 destacam-se pesquisas relacionadas a tecnologias assistivas voltadas aos idosos, bem como estratégias de marketing e políticas de atenção para esse público. É notório que a multidimensionalidade de abordagens das questões do envelhecimento exige enfoque multidisciplinar sobre um contexto de excelência acadêmica. Assim, conclui-se que as pesquisas do PPGGero/UFSCar, ao abrangerem várias áreas do conhecimento – as quais permeiam as ciências humanas, biológicas, sociais e exatas no contexto de tecnologia e inovação –, promovem a formação de mestres e pesquisadores que contribuem para a produção de conhecimento em Gerontologia no país