Influência da adição de difeniliodônio em propriedades físicas e biológicas de um cimento de hidróxido de cálcio modificado por resina

Abstract

Objective: To evaluate the influence of the addition of a polymerization catalyst (diphenyliodonium hexafluorphosphate - DFI) at concentrations of 0%, 2%, 4% and 8% in a resin modified calcium hydroxide cement on the conversion grade properties. (GC), polymerization depth (PP), flexural strength (RF), elastic modulus (ME), sorption / solubility (SS), hydroxyl release (LH) and cytotoxicity (CT). Materials and methods: Ultra-Blend plus calcium hydroxide cement was used. For DFI inclusion, four groups were created according to different concentrations: control group (G0) without DFI inclusion; addition of 2% DFI (G2); addition of 4% DFI (G4) and 8% DFI (G8). For data analysis of GC, PP, RF, ME, SS tests we used the one-way ANOVA tests and for the LH test the two-way ANOVA and post Tukey test (p <0.05). Results: For CG, G (2) and G (8) presented the highest values, in contrast G (4) showed intermediate result and G (0) lower outcome among all. However, for PP, there was significant difference between 0% and 8% concentrations. In RF, G (2) showed higher values among all groups, while G (4) and G (8) showed similar statistical effects. In the ME, G (2) and G (8) obtained their values statistically higher than G (4) and G (0) was lower among all. In Sorção, G (8) was better than the other groups, whereas in Solubility G (0) was significantly higher than the other groups. In LH, G (0) and G (2) had their maximum release peaks at time 72h. However, G (4) and G (8) had a maximum release peak at 72h and 7 days; however, all groups were statistically similar at 14 days, showing values lower than all studied times. For TC, there was a statistically significant difference between the percentages in 24h time in contact with the environment (p <0.05). Conclusion: The groups with diphenyliodonium addition presented the mechanical and biological properties superior to the control group, having better results in the concentration of 2%.