In order to help choose the effective clinical materials of the repair furcal perforation. 2%methylene blue has been used to test the effusion of four kinds of tooth filling materials in the repair furcal perforation. The results showed the effusion of light cure glass ionomer cement was the least. Amalgam came second. The effusion of hydroxylapatite was most heavy and the staining solution leaked to the whole cavity, but the technique on the layers of splint with hydroxylapatite and light cure ionome...
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