Resumo Objetivos: avaliar a influência de fatores socioeconômicos sobre a concentração de alfa-tocoferol no soro materno. Métodos: estudo transversal observacional retrospectivo, com participação de 103 parturientes voluntárias adultas atendidas no Hospital Universitário Ana Bezerra em Santa Cruz - Rio Grande do Norte. Foram coletados 5,0 mL de sangue em jejum antes do parto para extração de alfa-tocoferol no soro. As informações socioeconômicas e demográficas foram obtidas por um questionário previamente estruturado. A determinação do alfa-tocoferol sérico foi por Cromatografia Líquida de Alta Eficiência (CLAE). Resultados: a concentração média de alfa-tocoferol no soro foi de 1281,4 (594,8) µg/dL, e 6% das mulheres apresentaram deficiência de vitamina E (DVE). A maioria das parturientes tinha idade entre 18 e 24 anos (59%), estado civil casada ou união estável (77%), com ensino fundamental completo (34%), baixa renda (74%) e moradia localizada na zona urbana (73%). Não foram encontradas diferenças significativas na concentração de alfa-tocoferol segundo característica socioeconômica, e nenhum dos fatores estudados foi associado a presença da DVE (p>0,05). Conclusões: as características sociais maternas não foram determinantes para o alfa-tocoferol sérico e DVE. Maiores investigações devem ser realizadas durante a lactação para avaliar quais fatores podem estar envolvidos na presença dessa deficiência.

Abstract Objectives: To evaluate the influence of the socioeconomic factors on the alpha-tocopherol concentration in maternal serum. Methods: a retrospective, observational, cross-sectional study with the participation of 103 adult parturient volunteers attended at Hospital Universitário Ana Bezerra (Ana Bezerra University Hospital) in Santa Cruz - Rio Grande do Norte. 5.0 mL of blood was collected from each participant in fasting before the delivery to extract alpha-tocopherol of the serum. Socioeconomic and demographic information were obtained by a previously structured questionnaire. Alpha-tocopherol serum was determined by a High-Performance Chromatography Liquid (Cromatografia Líquida de Alta Eficiência (CLAE). Results: The average concentration of alpha-tocopherol in the serum was 1281.4 (594.8) µg/dL, and 6% of the women presented vitamin E deficiency (DVE). Most pregnant women aged between 18 and 24 years (59%), marital status was married or consensual marriage (77%), elementary schooling complete (34%), low family income (74%) and living in the urban area (73%). No significant differences were found in the alpha-tocopherol concentration according to socioeconomic characteristics and none of the studied factors were associated to the presence of DVE ( p >0.05). Conclusions: The maternal social characteristics were not determinants for the alpha-tocopherol serum and DVE. Further investigations should be carried out during lactation to assess which factors may be involved in the presence of this deficiency.

Recent studies involving the use of calcium aluminate cement (CAC) as a biomaterial are based on commercial products. Improvements can be attained by investigating the properties of their crystalline phases in order to better design the material's composition. Therefore, calcium aluminate phase samples immersed in simulated body fluid (SBF) solutions prepared according to Kokubo’s (KSBF) and Rigo’s (RSBF) methodology had their pH evaluated. The surfaces of these samples were analyzed by SEM, EDX and XRD techniques. The treatment with KSBF did not favor the precipitation of calcium phosphate phases on the surface of CAC phases. On the other hand, in RSBF solution, the pH value attained was higher than for the KSBF one and magnesium phosphate was identified on the surface of CA, C3A and C12A7 samples. Only for CA2, the optimal precipitation condition was attained in RSBF and a surface layer of the hydroxyapatite was detected. Based on its ability of stimulating hydroxyapatite deposition in SBF and other properties, CA2 can be eligible as the most suitable composition for biomedical purposes.

The aim of this study was to determine the best radiopaque additive to be incorporated to calcium aluminate cement (CAC) to promote radiopacity. Measurements of optical density were carried out on white MTA and CAC with and without additives such as: polymeric dispersant, plasticizer and various radiopacifiers. The effects of the radiopacifying addition on some properties of CAC were also evaluated. The radiopacity value for CAC-Bi2O3 (25%) was higher than the other radiopacifying agents tested. The addition of ZnO (25%) and 15%ZnO:10%Bi2O3 increased the compressive strength of CAC, whereas for Bi2O3 (25%) containing samples the strength was lower than for the CAC. The ZnO (25%) and 15%ZnO:10%Bi2O3 additions also reduced the apparent porosity. CAC does not have sufficient radiopacity to be distinguished from adjacent anatomic structures, such as dental tissues and bone. The addition of 15%ZnO:10%Bi2O3 can be suggested as the most suitable one to obtain the best compromise between good physical and mechanical properties and ideal radiopacity for clinical purposes.