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In vitro Evaluation of Surface Free Energy of Dentin after Treatment with Sodium Trimetaphosphate Associated or Not with Fluoride, Exposed or Not to Calcium

2021; Karger Publishers; Volume: 56; Issue: 1 Linguagem: Inglês

10.1159/000520162

1421-976X

Lenara Queiroz Chaves Oliveira, Alberto Carlos Botazzo Delbem, Leonardo Antônio de Morais, Silvio César Gonçalves, José Antônio Santos Souza, Denise Pedrini,

Dental Health and Care Utilization

It has been stated that sodium trimetaphosphate (TMP) promotes a more anionic dentin surface inducing greater calcium (Ca) and phosphate precipitation. The aim of the present study was to evaluate in vitro the surface free energy (γ_<i>s</i>) of dentin after treatment with TMP associated or not with fluoride (F), exposed or not to Ca, as well as the adsorption of TMP, F, and Ca by dentin. Bovine dentin blocks (<i>n</i> = 12 blocks/group) were treated with solutions containing TMP at 0, 1, 3, or 9 (w/v) followed or not by the application of Ca. These solutions were or were not associated to 1,100 ppm F. F, Ca, and TMP were determined in the solutions before and after the treatment to calculate the adsorption by dentin. To analyze the γ_<i>s</i> of dentin, the apolar (γ_<i>s</i>^LW), and polar (γ_<i>s</i>^AB), components were determined by contact angle measurement. Data were submitted to 2-way ANOVA followed by the Student-Newman-Keuls test (<i>p</i> &#x3c; 0.05). TMP reduces γ_<i>s</i> of dentin and increases electron donor sites (γ_<i>s</i>⁻). Higher values of γ_<i>s</i>⁻ led to higher adsorption of Ca (<i>p</i> &#x3c; 0.001). The F/TMP association did not change γ_<i>s</i> or γ_<i>s</i>^LW and reduced the values of γ_<i>s</i>⁻, but the adsorption of Ca was higher. There was correlation between the adsorption of TMP and γ_<i>s</i>⁻ (Pearson’s <i>r</i> = 0.801; <i>p</i> &#x3c; 0.001) and F (Pearson’s <i>r</i> = 0.871, <i>p</i> &#x3c; 0.001). It is possible to conclude that TMP increased γ_<i>s</i>⁻ and Ca adsorption, and reduced γ_<i>s</i>. The association with F increased the adsorption of TMP without rising γ_<i>s</i>⁻; however, there was higher adsorption of Ca.