Avaliação da radiopacidade dos cimentos MTA angelus® branco, MTA HP repair e Bio C repair através de imagem digital

Abstract

The aim of this study was to evaluate the radiopacity of the bioceramic material BIO C, in order to compare it with MTA B, MTA HP cements and with human dental structures. For this, five specimens were made for each studied cement, with 4 mm in diameter and 2 mm in height, in elastomer matrices. Each sample was radiographed by the digital method together with a central 2 mm thick slice of a healthy lower human molar tooth and an aluminum density scale, this thickness ranging from 2 to 16 mm, in increments of 2 mm. The exposure time as well as the focus-film distance, once determined, were kept constant in all exposures. For each set, five images were evaluated for optical densities using the histogram tool of the ImageJ software. In each evaluated structure (enamel, dentin, MTA B, MTA HP, BIO C and the steps of the density scale) a pre-defined ROI was used and the densities were presented using means and standard deviations. To compare the radiopacities of the three cements, the Kruskal-Wallis non-parametric test and the SPSS program were used, with a significance level of 5% (p ≤ 0.05). The test carried out indicated that the BIO C cement had a radiopacity higher than MTA B (p = 0.001) and MTA HP (p = 0.034). When compared to dental structures, the three cements exhibited greater radiopacity than enamel and dentin. Thus, it could be concluded that BIO C exhibited high radiopacity, being in accordance with ISO 6876 and can be a substitute for materials based on MTA.