Antimicrobial and physical-chemical properties of portland cement associated with different concentrations of calcium oxide
Autor(es): Siqueira PC, Borges KGT, Santos RG, Renovato SR, Decurcio DA
Palabras clave: Tratamento do canal radicular; Óxido de cálcio; Materiais dentários.
Objective: To evaluate radiopacity, antimicrobial activity, surface structure and chemical composition of the Portland cement (PC) associated with different concentrations of calcium oxide. Material and Methods: The materials tested were: Mineral Trioxide Aggregate (MTA), gray PC and PC with calcium oxide at concentrations of 1%, 2%, 5%, and 10%. To analyze the radiopacity, the materials were introduced in acrylic plates positioned next to an aluminum penetrometer. The evaluation of the antimicrobial action was carried out through the diffusion test in Agar, with microorganisms: S. aureus, E. faecalis, P. aeruginosa, B. subtilis and C. albicans. The evaluation of the surface structure was carried out using a scanning electron microscope (SEM) and identification of the chemical elements was performed with the dispersive energy spectroscopy. Results: The MTA presented values of radiopacity above step 3 of the aluminum ladder, while CP with different concentrations of calcium oxide showed radiopacity below this value. No group tested showed antimicrobial efficacy by agar diffusion test, with the absence of inhibition halos. The materials presented different regularities in images by SEM, with particles of similar sizes and variable shapes. The same chemical elements were found in all groups studied. Conclusions: Only the MTA cement presented radiopacity with a value above the minimum recommendation; None of the cements tested showed antimicrobial efficacy; The presented materials have similarity both in the analysis of the surface and in the analysis of the chemical elements.
