A.乳牙早失 B.乳牙滯留 C.口腔不良習(xí)慣 D.唇系帶異常 E.長(zhǎng)期食用精細(xì)柔軟的食物
A.遺傳性和后天性擁擠 B.單純擁擠和復(fù)雜擁擠 C.替牙列擁擠和恒牙列擁擠 D.前牙擁擠和后牙擁擠 E.青少年擁擠和成人擁擠
A.91%~98% B.85%~90% C.80%~93% D.60%~70% E.20%~50%