Análise da composição química dos cimentos Biodentine ®, MTA Angelus® branco, cinza e MTA Repair HP através de microscopia eletrônica de varredura (MEV) acoplada a espectrômetro de energia dispersiva (EDS)

Abstract

The objective of this work was to analyze the chemical composition of Biodentine cements, MTA Angelus white, gray and MTA Repair HP. For this purpose, 5 specimens of each type of cement studied were made, with a diameter of 4 mm and a height of 1 mm, in Stubs using conductive double-sided carbon tape. This set was taken to the metallizer bell, in which a thin layer of carbon was deposited on the surface so that the electrons could be conducted. Then, the samples were analyzed with the aid of a scanning electron microscope coupled to a dispersive energy spectrometry device. The collected data were submitted to the Kolmogorov-Smirnov statistical test to define data normality. The chemical elements that presented normal distribution (mean of 5%) were submitted to the ANOVA test and the Kruskal-Wallis test was applied to those that presented asymmetric distribution. After analyzing the chemical elements, the following were observed for Biodentine: O, Na, Si, Ca, C, Au and Cl; for white MTA: O, Na, Al, Mg, Si, K, Ca, Bi; for gray MTA: O, Al, Mg, Si, S, K, Ca, Fe and Bi; and for Repair: O, Al, Mg, Si, Ca, Fe, Sr, C, Rb and W. Thus, 16 chemical elements were identified in the analyzed samples: O, Na, Al, Mg, Si, S, K, Ca, Fe, Sr, Bi, C, Rb, W, Au and Cl. Of these elements, 3 were found in all cements studied: O, Ca, Si. The Fe element was not found in Biodentione, but was found in MTA gray and Repair cements. Bismuth was identified in white and gray cements. The elements Rb, W and C were found only in Angelus' new MTA formulation, Repair HP. In the analyzed samples, Ca and O were the ones that presented the most graphically high peaks. The chemical composition of hydraulic cements is the most important factor for understanding the physical, chemical and biological properties of these materials.