目的以实验方法比较银粉玻璃离子(GISRR)可塑性核桩和铸造核桩的固位力。
Objective to compare the retention of the plastic core with GISRR (Glass Ionomer Silver Reinforced Restorative) with that of the easting core.
第三，银粉玻璃离子具有缓慢释放氟离子的特性，而银汞合金没有。
The third , Hi-dense can release fluoride slowly, but silver amalgam alloy can't.
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