Method: The prototype MMA resin which contain S-PRG filler at 0, 5, 10, 20 or 30w/w% was tested in the present study. For mechanical properties, Vickers hardness number was measured and the three point bending strength was also evaluated with rectangular parallelepiped specimens, 2.0 × 2.0 × 25mm used by the universal testing machine at 1.0mm/min of crosshead speed. For the amounts of ionic release, disk shaped specimens, 10mm in diameter and 2mm thickness, were prepared and measured ionic release from the specimens with an inductively coupled plasma to quantify Al3+, Sr2+, SiO32-, BO33-, and Na+ and a fluoride ion electrode for F-at 1, 2, 3, 30 and 60days.The data were statistically analyzed by One-way ANOVA and Tukey test (P<0.05).
Result: For mechanical propertices, VHNs were gradually decreased when increasing the content of S-PRG filler. And the VHN was statistically lowered at 30% of S-PRG filler. Three point bending strength were statistically decreased at 10, 20 and 30% of S-PRG filler.The maximum ionic release from specimen was Sr2+ and the minimum was Al3+in all period tested. All ionic release from the specimens showed similar patterns, that most release occurred in 24hrs and then those amounts gradually decreased in the test period.
Conclusion: The results in this study suggested that the amount of S-PRG filler at 5-10% showed better mechanical properties for MMA resin. And S-PRG filler released metallic ions at various concentrations.