primary acellular extrinsic fiber cementum 礦化最高
rimary acellular intrinsic fiber cementum 最早形成
acellular afibrillar cementum 齒頸部 overlapping CEJ (65%)
2.有關牙骨質(cementum)的敘述,下列何者正確? (A)牙骨質的硬度..-阿摩線上測驗