俗称门牙。位于口腔前部的上、下颌骨，呈弧形排列，分为上颌中切牙，上颌侧切牙，下颌中切牙和下颌侧切牙，共八颗切牙，唇面牙冠呈楔形，牙根单一，切缘较薄，故其主要功能为咬断食物，以利臼齿的咀嚼。乳牙于6岁左、右更换恒齿。
n. incisor
misc. incisor teeth
结果得到切牙乳突与腭皱形态的测量方法和基础数据。
Results We gained the basic data and find a measuring method of incisive papilla and palatal wrinkle.
但有资料表明下颌切牙的根管解剖形态较为复杂，变异较多。
However, some research data show that mandibular incisors' root canal anatomy is comparatively complex, and root canal system has many variations.
目的：推导切牙合功能时，髁状突向前下方运行的距离及生理意义。
Objective: How distant the condyle moved to protrusive and its function importance for incisors occlusion.
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