A.0.5mm B.0.8mm C.2.0mm D.1.2mm E.2.5mm
A.通過根管從齲洞排膿 B.向鼻腔排膿 C.穿通唇頰側(cè)骨壁排膿 D.穿通舌腭側(cè)骨壁排膿 E.由齦溝或者牙周袋排膿
A.20% B.3%~5% C.1% D.10%~12% E.0.1%