Efeito anticárie e propriedades de infiltrantes resinosos incorporados com nano-hidroxiapatita de cálcio e de estrôncio
| Autor: | Cavalcante, Salma Ivanna Araújo |
|---|---|
| Přispěvatelé: | Gerage, Lidiany Karla Azevedo Rodrigues, Feitosa, Victor Pinheiro |
| Jazyk: | portugalština |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Repositório Institucional da Universidade Federal do Ceará (UFC) Universidade Federal do Ceará (UFC) instacron:UFC |
| Popis: | Aiming to improve the performance of resinous infiltrants in the control of initial caries lesions, by introducing remineralizing capacity to the material, the incorporation of hydroxyapatite nanoparticles has been proposed. Among them, strontium hydroxyapatite (NSrHAp) and calcium (NHAp) nanoparticles have stood out due to potential improvements in the mechanical, biological and remineralizing properties of the materials. The objective of this study was to evaluate the effect of the incorporation of NHAp and NSrHAp, synthesized by the hydrothermal method for 2 h and 5 h, on the roughness and degree of conversion of an experimental infiltrant, as well as on the inhibition of caries lesion adjacent to the infiltrated enamel, constituting the experimental groups: NSrHAp2h, NHAp2h, NSrHAp5h and NHAp5h. Enamel treated with base infiltrant (C) and a demineralized group with phosphoric acid were used as controls. The nanoparticles were then incorporated at a concentration of 5% by weight in C. The degree of conversion (GC- in triplicate) and roughness (n = 10) were evaluated, respectively, by Raman spectrophotometry and by mechanical profilometry, for each infiltrant. Sixty blocks of human enamel were artificially demineralized through pH cycling, treated with experimental infiltrants, and having an adjacent area preserved without any treatment. After carrying out the treatments, the blocks were cut in half and half of each block was submitted again to the pH cycling model. Analysis of microhardness in longitudinal section of the enamel was performed after treatments and after pH cycling in the area adjacent to the infiltrated artificial lesion. Microhardness data were compared by two-way ANOVA and Tukey's test (p 0.05). The infiltrating CG did not show statistically different values (p = 0.212). After pH cycling, the NSrHAp2h infiltrant increased the enamel hardness in the region adjacent to the infiltrated area, while the other groups showed a reduction in microhardness (p 0,05). O GC dos infiltrantes não apresentou valores estatisticamente diferentes entre si (p = 0,212). Após a ciclagem de pH, o infiltrante NSrHAp2h aumentou a dureza do esmalte na região adjacente à área infiltrada, enquanto os demais grupos apresentaram redução na microdureza (p |
| Databáze: | OpenAIRE |
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