Análise longitudinal do efeito de soluções desinfetantes sobre a rugosidade de superfície e estabilidade de cor de materiais reembasadores

Abstract

This in vitro study evaluated the effects caused by disinfectant solutions on the color stability and roughness of resilient reliners at different time periods. For such study, 60 circular specimens (3x15mm) were prepared for each material used, TDV and Soft Confort, which were randomly distributed in 4 groups/reliner (n=15): AC: Undiluted acetic acid (vinegar); SH0.25% / SH0.5% / SH1%: Sodium hypochlorite at 0.25%, 0.5% and 1%, respectively. The disinfection protocol considered 20 minutes of immersion in the disinfectant solutions. For the readings of the response variables, the surface roughness was measured by a rugosimeter and the color change by a spectrophotometer. The periods of analysis were after 7, 14, 21, 30, 60, 90, 180 and 270 days of immersion. Data processing was realized by the Anova (Three-way) and Tukey Test, since the data distribution was normal (Shapiro-Wilks Test). For the specimens of both materials, SH0.5% (1.34 ± 0.40) caused the greatest changes in surface roughness, while vinegar (1.2 ± 0.40) and SH0.25% (1.24 ± 0.46), the lowest, with equivalence between them, and SH1% (1.34 ± 0.40) was intermediate between the other solutions. There was a difference between the times only for the group of SH0.5%, which caused changes only with 21 days of immersion, reaching the highest values, which was equal to the final time of 270 days. As for the color change, there was a significant difference between the materials (p = 0.000), in which the Soft Confort resilient reliner (4.20 ± 2.90; NBS System: significant) obtained the best results compared to TDV (6.40 ± 3.10; NBS system: large). The specimens of the two resilient reliners obtained greater color change after immersion in SH0.5% and lower in vinegar. Intermediates between SH0.25% and SH1% which obtained values different from each other, but were equal, according to the NBS classification, including with vinegar. In conclusion, the most suitable disinfectant solution to control color change is vinegar and surface roughness of the resilient reliners analyzed is 0.25% sodium hypochlorite.