A.氟牙癥 B.融合牙 C.特奈牙 D.四環(huán)素牙 E.先天梅毒牙
A.1/2 B.2/3 C.1/3 D.3/4 E.4/5
A.20%~30% B.30%~40% C.40%~50% D.50%~60% E.60%~70%