Análise da composição química dos cimentos MTA Ângelus cinza, branco repair HP e Bio-c Repair através de microscopia eletrônica de varredura (MEV) acoplada a espectrômetro de energia dispersiva (EDS)

Abstract

This essay aimed to analyze the chemical composition of the cements MTA Angelus® white, gray, Repair HP® and Bio-C Repair®. In order to accomplish that, 5 proof bodies out of every type of cement that was studied were made, with a diameter of 4mm and height of 1mm, then fixed in Stubs utilizing carbon double-sided conductive tape. This set was taken to the metallizer campanula, on which a thin coating of gold was deposited on the surface in order to conduct the electrons. Next, the samples were analyzed with help from a scanning electron microscope attached to the dispersive energy spectrometer device. The data collected was subjected to the statistic test Kolmogorov-Smirnov to define the normality of the data. The chemical elements that presented normal distribution (average of 5%) were subjected to the ANOVA test and the Kruskal-Wallis test was applied on those that showed asymmetrical distribution. After the analysis of the chemical elements, it was observed for the white MTA: O, Na, K, Mg, Al, Si, Ca and Bi; for the gray MTA: O, Mg, Al, Si, Ca, Bi, Fe and S; Repair HP: O, Al, Mg, Si, Ca, Fe, Sr, C, Rb and W and Bio-C Repair: O, C, Ca, Si, Zr, Na and Al. Thus, 14 chemical elements were identified in the analyzed samples: O, Na, Al, Mg, Si, S, K, Ca, Fe, Sr, Bi, C, Rb, W and Zr. Out of all these elements, 5 were found on all of the fomulas studied: O, Al, C, Si e Ca. The elemento Fe was found only on the Gray MTA and MTA Repair HP. Bismuth was found only on White and Gray MTA. Rb and W were found only on the MTA Repair H®P. Zr was presente only on the specimens of Bio-C Repair®