A.小管周牙本質(zhì) B.小管間牙本質(zhì) C.小球間牙本質(zhì) D.修復(fù)性牙本質(zhì) E.繼發(fā)性牙本質(zhì)
A.45% B.55% C.65% D.75% E.85%
A.上皮根鞘 B.牙乳頭 C.上皮隔 D.成釉器 E.牙囊