Caracterização e estabilidade de resina ortodôntica associada a nanomateriais e enriquecida com própolis

Abstract

Pathological involvement of oral tissues, enamel and gingiva, during the orthodontic treatment period is frequent, due to the favoring of accumulation of food residues and changes in pH in them. The present work aimed to propose an orthodontic resin with bactericidal and bacteriostatic potential. The resin was characterized by spectroscopy techniques like UV-VIS region, FTIR, BET, as well as impedance and microcospic analyzes (MET), with which it was possible to observe the behavior of the nanoparticulate Othocem orthodontic resin, post-polymerization and after, separately, immersion in H2O, in NaCl solution pH 7.0, in hydrochloric acid solution pH 2.0 and in sodium hydroxide solution pH 10, simulating pH changes in the buccal environment for up to 30 days. These tests were performed with the pure resin and later enriched with propolis extract. Commercial and lyophilized alcoholic extracts of the yellow, green and red propolis were used, which were added to the Orthocen resin. In the two steps relevant results were obtained. In the second stage, the tests by UV-VIS, FTIR, BET and a test of evaluation of the adhesiveness with electronic equipment for shearing were repeated. The most evident and significant results occurred with both the pure resin and the resin with propolis, immersed in solutions of pH 7 and pH 10. The release of monomers not achieved by polymerization, mainly in saline and basic media, was observed as a factor unfavorable. Good yellow and green propolis homogenization was observed with the commercial resin according to FTIR and BET results. The shear test showed that propolis additions did not compromise the adhesive performance of the commercial resin used, through Statistical Analysis of Variance, applied the Tukey test, making it perfectly possible to synthesize an orthodontic adhesive resin with action on the causative pathogens of caries and gingivitis during orthodontic treatment.