With the loss of the alveolar height, the maximum equivalent stress and the principle stress of the upper central incisor periodontium increased. 隨著(zhù)牙槽骨高度的降低，上中切牙牙周膜最大等效應力和主應力逐漸增大。
There is no significant stress difference in the dentin for glass ionomer restoration when compared with that of an opening incisor. 凡以玻璃水門(mén)汀為補綴材料之門(mén)齒，在應力分布的表現上皆與根管治療后尚未補綴之門(mén)齒相同沒(méi)有差異。
Cusp-like structure projects from the cingulum area or cementoenamel junction on the palatal surfaces of the maxillary anterior teeth. 這如牙阜般的結構是出現在上顎正中門(mén)齒顎側，由舌面隆凸向牙骨質(zhì)牙釉質(zhì)交接處延伸。
