Energia livre de superfície do esmalte dentário tratado com hexametafosfato de sódio, cálcio e fosfato
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2016-07-04
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Universidade Estadual Paulista (Unesp)
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Objetivo: Esse estudou avaliou a capacidade de adsorção do hexametafosfato de sódio (HMP) em diferentes concentrações no esmalte dentário. Desenho: Blocos de esmalte bovino (4 mm x 4 mm, n=144, 12/grupo) foram selecionados e divididos em 12 grupos: 0%; 0,25%; 0,5%; e 1% HMP, e essas concentrações de HMP seguida da aplicação em solução contendo Ca ou Ca-PO4 Os tratamentos foram realizados por 1 min (1 mL/bloco), e a seguir expostos ao ar para que houvesse a formação de película. A energia livre de superfície (mN/m) foi calculada pela medida dos ângulos de contato de três líquidos sondas: água deionizada, diiodometano e etileno glicol; determinando os componentes polar e apolar da superfície do esmalte. Analisaram-se as concentrações de cálcio (Ca), fosfato (PO4) e HMP nas soluções, antes e após os tratamentos. Os dados apresentaram distribuição normal (Kolmogorov-Smirnov) e homogênea (Cochran) e a seguir foram submetidos a ANOVA seguido pelo teste Student-Newman Keuls (p<0,05). Resultado: Quanto maior a % de HMP nas soluções maior a adsorção de HMP e a eletronegatividade na superfície do esmalte (p<0,05). A adsorção de Ca foi maior com o aumento da % de HMP na solução (p<0,05) reduzindo a eletronegatividade na superfície do esmalte. Maior adsorção de Ca e PO4 ocorreu com 0,5% HMP e 1% HMP após o tratamento com solução Ca-PO4, deixando a superfície menos eletronegativa quando comparado aos demais tratamentos (p<0,05). Conclusão: Conclui-se que o HMP promove uma superfície de esmalte mais eletronegativa favorecendo uma maior adsorção dos íons Ca e PO4.
Objective: This study evaluated the sodium hexametaphosphate (HMP) capacity adsorption at different concentrations in the dental enamel. Design: Bovine enamel blocks (4 mm x 4 mm, n = 144, 12 group) were selected and divided into 12 groups: 0%; 0.25%; 0.5%; and 1% HMP, and these HMP concentrations followed by the application solution containing Ca or Ca-PO4. The treatments were performed for 1 min (1 ml /block), and then exposed to air so that there was the formation of a pelicle. The surface free energy (mN/m) was calculated by measuring the contact angles of liquids three probes: deionized water, diiodomethane and ethylene glycol; determining the polar and nonpolar components of the enamel surface. It was analyzed the calcium (Ca), phosphate (PO4) and HMP in the solutions, before and after treatment. The data were normally distributed (Kolmogorov-Smirnov) and homogeneous (Cochran) and then were subjected to ANOVA followed by Student-Newman Keuls test (p <0.05). Results: The greater HMP % in solutions, the greater adsorption of HMP and electronegative surface enamel (p<0.05). The Ca adsorption was higher with HMP % increasin in the solution (p<0.05) reducing enamel surface electronegativity. Increased adsorption of Ca and PO4 occurred in 0.5% and 1% HMP and HMP after treatment with Ca-PO4 solution, leaving the less electronegative surface when compared to the other treatments (P<0.05). Results: The higher HMP% solutions was greater HMP adsorption and electronegative surface enamel (p<0.05). The Ca adsorption was higher with increasing HMP % in the solution (p<0.05) in reducing electronegativity enamel surface. Increased adsorption of Ca and PO4 occurred in 0.5% and 1% HMP HMP after treatment with Ca-PO4 solution, leaving the less electronegative surface when compared to the other treatments (P <0.05). Conclusion: The HMP promotes more electronegative in enamel surface, achieving greater adsorption of Ca and PO4 ions.
Objective: This study evaluated the sodium hexametaphosphate (HMP) capacity adsorption at different concentrations in the dental enamel. Design: Bovine enamel blocks (4 mm x 4 mm, n = 144, 12 group) were selected and divided into 12 groups: 0%; 0.25%; 0.5%; and 1% HMP, and these HMP concentrations followed by the application solution containing Ca or Ca-PO4. The treatments were performed for 1 min (1 ml /block), and then exposed to air so that there was the formation of a pelicle. The surface free energy (mN/m) was calculated by measuring the contact angles of liquids three probes: deionized water, diiodomethane and ethylene glycol; determining the polar and nonpolar components of the enamel surface. It was analyzed the calcium (Ca), phosphate (PO4) and HMP in the solutions, before and after treatment. The data were normally distributed (Kolmogorov-Smirnov) and homogeneous (Cochran) and then were subjected to ANOVA followed by Student-Newman Keuls test (p <0.05). Results: The greater HMP % in solutions, the greater adsorption of HMP and electronegative surface enamel (p<0.05). The Ca adsorption was higher with HMP % increasin in the solution (p<0.05) reducing enamel surface electronegativity. Increased adsorption of Ca and PO4 occurred in 0.5% and 1% HMP and HMP after treatment with Ca-PO4 solution, leaving the less electronegative surface when compared to the other treatments (P<0.05). Results: The higher HMP% solutions was greater HMP adsorption and electronegative surface enamel (p<0.05). The Ca adsorption was higher with increasing HMP % in the solution (p<0.05) in reducing electronegativity enamel surface. Increased adsorption of Ca and PO4 occurred in 0.5% and 1% HMP HMP after treatment with Ca-PO4 solution, leaving the less electronegative surface when compared to the other treatments (P <0.05). Conclusion: The HMP promotes more electronegative in enamel surface, achieving greater adsorption of Ca and PO4 ions.
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Palavras-chave
Fosfatos, Esmalte dentário, Energia, Phosphates, Dental enamel, Energy