Pit and fissure sealant application updating the technique
In the past, a few efforts had been made in order to shield pits and fissures against caries.
88 specimens with the original flat enamel surface were assigned to group F and were used for interface observation and the shear bond strength (SBS) test; 40 specimens with the original flat enamel surface and 40 specimens with round cavities of 2 mm in diameter and 1 mm in depth prepared with a dental handpiece were assigned to group A and group B, respectively.
And the specimens of group A and group B were used for microleakage evaluation.
Two types of sealants were evaluated in this study, and they were sealant 3M ESPE Concise (3M ESPE Dental Products, Mc Gaw, USA; Code E) and sealant Helioseal F (Ivoclar Vivadent AG, USA; Code H).
The enamel of 168 specimens was grounded to a flat surface. Sealants were applied to enamel surface (88 specimens, group F) either subjected or not to subpressure.
The bonding interfaces were observed using scanning electron microscopy (SEM) and the SBS was examined using a universal testing machine before and after thermocycling. For the microleakage test, 80 specimens were grouped as group A (original enamel flat surface) and group B (a round cavity of 1 mm in depth) (40 per group).