Serious tooth defect which involved cuspid, incisal Angle, marginal ridge and occlusal surface can't be filled and need occlusal reconstruction.
各种严重的牙体缺损已涉及牙尖、切角、边缘嵴以及合面，需要咬合重建而不能使用一般充填修复者。
2
The vertical shifts of brackets could change the preadjusted torque value and the design of cuspid bracket should have the distinction between mesial and distal shape.
托槽垂直向移位可引起既定转矩值的改变，尖牙托槽底板弧度应有近远中之分。
3
Objective: To study the tooth size correlation between permanent cuspid and bicuspid group and other teeth groups in malocclusion.