Biomechanical Effects of New Resin Matrix System on Dental Fiber-Reinforced Composites

摘要

There are concerns that dental materials based on bis-phenol-A-glycidylmethacrylate (bis-GMA) may be hazardous. Alternative monomers such as 1,6-hexanediol dimethacrylate (HDDMA) is under research. This research aimed to determine the effect of resin matrix compositions on the biomechanical properties of E-glass fiber-reinforced composite (FRC) using bis-phenol-A-glycidylmethacrylate (bis-GMA), methylmethacrylate (MMA), 1.6-hexanediol dimethacrylate (HDDMA), camphorquinone (CQ) and N,N-cyanoethyl methylaniline (CEMA). The ratios of the resin matrices (weight %) were 78.4 % bis-GMA + 19.6 % MMA + 1 % CQ + 1 % CEMA (control-group), 78.4 % HDDMA + 19.6 % MMA + 1 % CQ + 1 % CEMA (EXP1-group) and 49 % HDDMA + 49 % MMA + 1 % CQ + 1 % CEMA (EXP2-group). E-glass fibers were embedded in matrix and light-cured for 3 x 40 s. Three-point bending (2 x 2 x 25) mm and Vicker's hardness (2 x 2 x 5) mm were examined (n = 6) by a universal testing machine (Torsee's UTM, Japan) and a micro-hardness tester (MTX70 Matsuzawa, Japan). The data were analyzed by ANOVA. Bending measurement revealed the mean value of control-group (674.1 + 9.9) MPa was higher than EXPl-group (638.1 ± 8.6) MPa and EXP2-group (448.3 + 7.8) MPa. The ANOVA showed significant difference in bending values among the groups (p < 0.05). Hardness measurement proved EXP1-group mean value (179.1 ± 2.5) VHN was higher than control-group (181.5 + 11.5) VHN and EXP2-group (168.2 + 7.9) VHN. The ANOVA proved there was significant difference (p < 0.05) in hardness values. In conclusion, a resin matrix system based on HDDMA-MMA (EXPl-group) showed comparable flexural strength and hardness properties to bis-GMA-MMA (control-group) system.