墊厚度將上下前牙離開多少最為適宜()
A.3.0mm B.5.0mm C.0.5~1.0mm D.0.3~0.5mm E.1.5~2.0mm
牙量骨量不調(diào)而產(chǎn)生的牙列擁擠約占錯的()
A.52% B.25% C.92% D.76% E.29%