Effect of rinsing direction of etched enamel surfaces on fissure sealant retention

Numerous Clinical studies have reported the effectiveness of fissure sealants in prevention of dental caries. However, the retention and longevity of sealants are highly dependent on clinical methods. The purpose of this study was to examine the effect of different rinsing direction (45º, 90º angles) of etched enamel surfaces on sealant-enamel bond strength. This experimental study was conducted on 31 premolar teeth, with two bonding surfaces located on the buccal and lingual sides. The selected smooth and vertical enamel surfaces that were prepared using a high-speed hand-piece that was mounted on a surveyor. After etching the enamel, the buccal surfaces were rinsed at 90º and the lingual surfaces were rinsed at 45º angles. After drying and application of sealant, the specimens were stored in distilled water at 37◦C for 24 hours prior to testing with Instron testing machine. Data were analyzed using Pearson correlation and paired T-tests. The statistical analysis revealed that the bond strength in 90º angle group was higher than the 45º angle group. However, the group difference was not statistically significant. (P=0.221) This experimental study showed that there was no significant difference in sealant bonding strength with different rinsing angles (90º, 45º).