The investment for dental titanium casting should possess chemical stability, ventilate properties and dilatability, so MgO and Al_2O_3 with adhesive, NH_4H_2PO_4, have been taken as the investment in our research because of their excellent properties.

• 牙科铸钛用包埋料需要有较好的化学稳定性、透气性、膨胀性等特性。 本研究采用的包埋料骨料为具有高耐火度的MgO和Al_2O_3,NH_4H_2PO_4为粘结剂。