In vitro effects of erosive challenge on the surface properties of sealants|
Medeiros, Isabella Cavalcante; Costa, Bruna Palmeira; Gondim, Brenna Louise Cavalcanti; Carlo, Hugo Lemes; Santos, Rogério Lacerda dos & Carvalho, Fabíola Galbiatti de
Aim: To assess in vitro the surface roughness (Ra), Vickers hardness (VHN) and surface
morphology of resin and glass ionomer materials used for sealants after dynamic erosive challenge.
Methods: Twenty specimens of each material were prepared and divided into experimental
(erosive challenge) and control groups (n=10): Protect Riva (SDI), Opallis Flow (3M ESPE),
Fluroshield (Dentsply), Filtek Z350 XT Flow (3M ESPE). The erosive challenge was performed
4 times per day (90 s) in cola drink and for 2 h in artificial saliva for 7 days. The control specimens
were maintained in artificial saliva. Ra and VHN readings were performed before and after
erosion. The percentage of hardness loss (%VHN) was obtained after erosion. The surface
morphology was evaluated by scanning electron microscopy (SEM). The data were analyzed by
ANOVA, Tukey and paired t tests (α=0.05).
Results: After erosion and saliva immersion, there was
an increase in Ra values for all groups and Riva group showed the highest Ra values. After erosive
challenge, Riva and Filtek groups showed significant decrease in VHN values, but Filtek group
showed the greatest %VHN. For all groups there was inorganic particle protrusion and matrix
degradation after erosion visualized by SEM images.
Conclusions: Erosive challenge affected
the surface properties of all materials used as sealants, particularly in the Riva and Filtek groups.
tooth erosion; composite resins; glass ionomer cements; hardness tests