WEAR RESISTANCE OF GLASS IONOMER SEALANTS MODIFIED WITH NANO-HYDROXYAPATITE AFTER CHEWING SIMULATION

Abstract

This study aimed to evaluate wear resistance of conventional glass ionomer sealants (Fuji VII) compared to glass ionomer sealants modified with nano-hydroxyapatite at concentrations of 5%, 8%, and 10% by weight. Wear resistance was assessed by measuring volume loss and surface roughness after chewing simulation at 120 000 and 240 000 strokes. The results revealed that the incorporation of nano-hydroxyapatite at all tested concentrations did not significantly affect volume loss and surface roughness compared to the control group (p>0.05). After 120 000 and 240 000 strokes, surface roughness of all material groups increased significantly compared with baseline values (p<0.05). However, no significant differences were observed among the material groups within the same cycle or between groups. In conclusion, modifying glass ionomer sealants with 5%, 8% and 10% nano-hydroxyapatite did not significantly enhance their wear resistance.

Keywords: Wear Resistance, Glass Ionomer Sealant, Nano-Hydroxyapatite, Surface Roughness