...entral incisor)位于切牙组：体积最大牙冠最宽位置最靠前 上颌中切牙的组成部分1、牙冠(crown of tooth) 2、牙颈(neck of tooth) 3、牙根(root of tooth)La 一、外部形态： 4个轴面、 1个切嵴唇面舌面近中邻面远中邻面 牙冠的唇面形态特点（labial surface）颈...
双语例句
1
Mehods In the neckoftooth odontotolomy and resinfying therapy were applied to treat secondary pulpitis of bicuspid with neck lesion .
方法牙颈部开髓塑化治疗双尖牙颈部损伤并发牙髓炎。
2
Conclusion The main supporting force position is on abutments of the bridge supported by tooth-implant; The implant neck is the most possible area for fracture.
结论：天然牙—种植体联合桥主要支撑力的部位是颈缘处，该处为种植体折断机率最大的区域；
3
Result:Stress concentration was markedly found on the neck and apex of bone-implant and bone-tooth interface;