4 research outputs found

    La mondialisation au Sud : espaces et populations

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    Diabetes and infections are associated with a high risk of implant failure. However, the effects of such conditions on the electrochemical stability of titanium materials remain unclear. This study evaluated the corrosion behavior of a Ti-6Al-4V alloy, with a smooth surface or conditioned by double-acid-etching, in simulated body fluid with different concentrations of dextrose and lipopolysaccharide. For the electrochemical assay, the open-circuit-potential, electrochemical impedance spectroscopy, and potentiodynamic test were used. The disc surfaces were characterized by scanning electron microscopy and atomic force microscopy. Their surface roughness and Vickers microhardness were also tested. The quantitative data were analyzed by Pearson's correlation and independent t-tests (alpha = 0.05). In the corrosion parameters, there was a strong lipopolysaccharide correlation with the I-pass (passivation current density), C-dl (double-layer capacitance), and R-p (polarization resistance) values (p<0.05) for the Ti-6Al-4V alloy with surface treatment by double-acid-etching. The combination of dextrose and lipopolysaccharide was correlated with the I-corr (corrosion current density) and I-pass (p<0.05). The acid-treated groups showed a significant increase in C-dl values and reduced R-p values (p<0.05, t-test). According to the topography, there was an increase in surface roughness (R-2 = 0.726, p<0.0001 for the smooth surface; R-2 = 0.405, p = 0.036 for the double-acid-etching-treated surface). The microhardness of the smooth Ti-6Al-4V alloy decreased (p<0.05) and that of the treated Ti-6Al-4V alloy increased (p<0.0001). Atomic force microscopy showed changes in the microstructure of the Ti-6Al-4V alloy by increasing the surface thickness mainly in the group associated with dextrose and lipopolysaccharide. The combination of dextrose and lipopolysaccharide affected the corrosion behavior of the Ti-6Al-4V alloy surface treated with double-acid-etching. However, no dose-response corrosion behavior could be observed. These results suggest a greater susceptibility to corrosion of titanium implants in diabetic patients with associated infections

    Randomized controlled clinical trial on two perineal trauma suture techniques in normal delivery Ensayo aleatorio clínico controlado para dos técnicas de sutura perineal en parto normal Ensaio clínico controlado aleatório sobre duas técnicas de sutura do trauma perineal no parto normal

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    The aim was to compare healing and perineal pain with the use of continuous and interrupted suture techniques in women after normal delivery. A randomized controlled trial was carried out at a hospital birth center in Itapecirica da Serra, Sao Paulo, Brazil. A total of 61 women participated with episiotomy or second degree perineal tear, allocated in two groups according to the continuous (n=31) or interrupted (n=30) suture techniques. The main outcomes evaluated were edema, ecchymosis, hyperemia, secretion, dehiscence, fibrosis, frequency and degree of pain (evaluated by numerical scale from 1 to 10). Data were collected during hospitalization and after discharge (four and 41 days after birth). Healing occurred by first intention in 100% of cases in both suture techniques. There were no statistically significant differences for the occurrence of morbidities, except for perineal pain due to palpation at four days after delivery, which was more frequent among women with interrupted suture.<br>El objetivo fue comparar la cicatrización y el dolor perineal utilizando técnicas de sutura continua y separada, en mujeres que realizaron parto normal. El estudio fue controlado aleatorio, realizado en un centro para parto normal en Itapecerica de la Sierra, Sao Paulo. Participaron 61 mujeres con episiotomía o desgarro perineal de segundo grado, distribuidas en dos grupos (sutura continua n=31 y sutura separada n=30). Las principales medidas evaluadas fueron edema, equimosis, hiperemia, secreción, dehiscencia de herida, fibrosis, frecuencia y magnitud del dolor (evaluada por escala numérica de 1 a 10). Los datos fueron recolectados durante la hospitalización y después del alta (de 4 a 41 días post-parto). La cicatrización fue por primera intención en 100% de los casos, para las dos técnicas de sutura. No se encontró diferencia estadísticamente significativa en los casos de morbilidad, con excepción del dolor perineal a la palpación al cuarto día post-parto, el que fue más frecuente en mujeres con sutura separada.<br>O objetivo foi comparar a cicatrização e a dor perineal com a utilização das técnicas de sutura contínua e separada em mulheres com parto normal. Realizou-se estudo controlado aleatório, em centro de parto normal, em Itapecerica da Serra, São Paulo. Participaram 61 mulheres com episiotomia ou rotura perineal de segundo grau, alocadas em dois grupos, segundo a técnica de sutura contínua (n=31) ou separada (n=30). Os principais desfechos avaliados foram edema, equimose, hiperemia, secreção, deiscência, fibrose, freqüência e magnitude da dor (avaliada pela escala numérica de 1 a 10). Os dados foram coletados na internação e após a alta (quatro e 41 dias pós-parto). A cicatrização foi por primeira intenção em 100% dos casos, nas duas técnicas de sutura. Não houve diferença estatisticamente significante para a ocorrência de morbidades, exceto na dor perineal à palpação, com quatro dias de pós-parto, que foi mais freqüente entre as mulheres com sutura separada
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