| Abstrak/Abstract |
Bis-GMA as resin matrix of FRC is widely used in dentistry is reported as cytotoxic. The resin matrix studied, 1,6 hexanediol dimethacrylate (HDDMA) has similar reactive groups than bis-GMA is not known as carcinogens. Clinically, resin matrix absorbs water and lower the material's strength. This study investigated the water sorption of FRC based on HDDMA monomer compared to bis-GMA. Fifteen specimens (2.0 mmx 2.0×25.0 mm) were divided into (Group-1): 78.4 wt-% HDDMA+19.6 wt-% MMA+1.0 wt-% CQ+1.0 wt-?MA, (group-2): 49.0 wt-% HDDMA+49.0 wt-% MMA+1.0 w-% CQ+1.0 wt-?MA and (group-3): 78.4 wt% bis-GMA+19.6 wt-% MMA+1.0 wt-% CQ+1.0 wt-?MA. Each specimen contained two E-glass fiber rovings. The specimens were light-cured and immersed in distilled water for 21 days. The differences in weights, beforeafter immersion were recorded. Group-1 proved the lowest average (0.004%), followed by group-3 (0.003%) and group-2 (0.01%). There was a significant difference among all groups (p < 0.05) while LSD showed a significant difference between groups 1 and 2 (p < 0.05) but no significant difference between groups 1 and 3 (p > 0.05). It is concluded that FRC based on HDDMA matrix (group-1) is comparable to bis-GMA (group-3) for its water sorption. |
