21.當根管發生穿孔時,下列何者較不適合當止血劑的材料?
(A)Ca(OH)2
(B)calcium sulfate
(C)ferric sulfate
(D)collagen(Colla-Cote)
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統計: A(401), B(86), C(602), D(107), E(0) #2626096
統計: A(401), B(86), C(602), D(107), E(0) #2626096