n.牙骨質
The root is covered with a hard material called cementum. 牙根上覆蓋著的堅硬材料叫作牙骨質。
These findings may contribute to the development of a periodontal treatment that includes cementum regeneration. 這些結果可以有助于牙周治療的發(fā)展，包括牙骨質的再生。
