Abstract

RODRIGUES, Stéfani Becker et al. Addition of bismuth subnitrate in denture base MMA polymer. RFO UPF [online]. 2014, vol.19, n.2, pp. 166-171. ISSN 1413-4012.

Objective: The aim of this study was evaluate the effect of adding different concentrations of bismuth subnitrate (SN) on the properties of denture base materials. Materials and method: Was added 0%, 1%, 2%, 5%, 10% and 20% weight of SN in acrylic resin (Classico) and subjected to the tests of flexural strength, Knoop hardness, radiopacity, antibacterial analysis, roughness and characterization of micro-Raman spectroscopy. The statistical test chosen was one-way ANOVA and Tukey. The significance level was 5% for all tests. Results: The results of flexural strength values were above the recommended by ISO 1567, the higher the concentration load greater the Knoop hardness value, was statistically significant at 10 and 20%, p <0.001; results showed roughness values below threshold roughness 0.2 μm. The addition of bismuth subnitrate did not receive an antimicrobial potential, but showed greater radiopacity, p <0.001. Conclusion: Thus, the addition of this load significantly influences the mechanical properties and radiopacity of this material which facilitates their removal when ingested or aspirated.

Keywords : Bismuto.; Polimetil metacrilato.; Radiopacidade.; Bismuth.; Polymethyl methacrylate.; Radiopacity..