info:eu-repo/semantics/article
Effect of Polishing on the Surface Microhardness of Nanohybrid Composite Resins Subjected to 35% Hydrogen Peroxide: An In vitro Study
Fecha
2021Autor
Cayo-Rojas, César Félix,2
Ramírez-Vargas, Giovanna Gisella
Medina y Mendoza, Julia Elbia
Aliaga-Mariñas, Ana Sixtina
Ladera-Castañeda, Marysela Irene, 2
Luis Adolfo, Cervantes-Ganoza,3
Institución
Resumen
The use of bleaching agents, despite being a conservative treatment, can
cause a decrease in the surface microhardness of dental resins, affecting their
aesthetics and performance. The aim of this study was to evaluate the in vitro
effect of polishing on the surface microhardness of nanohybrid composite
resins that were subjected to bleaching with 35% hydrogen peroxide. Materials
and Methods: This cross-sectional, in vitro experimental study consisted of 30
composite resin samples made according to ISO 4049-2019 and divided equally
into two groups (A and B) which were subjected to 35% hydrogen peroxide
bleaching. Group A was subjected to polishing procedure, whereas group B was
the control group. The samples were stored in distilled water at 37°C for 24 h.
The Vickers microhardness was determined with a load of 100 g-f for 10 s. The
data were analyzed with Student’s t-test for independent samples at a confidence
level of 95%. Results: The surface microhardness of the group that was subjected
to polishing (A) obtained a mean of 78.07 ± 7.96 HV, whereas for the group that
was not subjected to polishing (B) the mean was 65.67 ± 5.22 HV. The difference
between groups (A and B) was statistically significant (P < 0.001). Conclusion:
Nanohybrid composite resins previously subjected to 35% hydrogen peroxide gel
significantly increased their surface microhardness when subjected to polishing
when compared with unpolished nanohybrid composite resins