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。
Objective: To study the tooth size correlation between permanent cuspid and bicuspid group and other teeth groups in malocclusion.
目的：研究错牙合、正常牙合的尖牙、双尖牙组与其它组牙的相关性，为尖牙、双尖牙组的预测提供科学依据。
Conclusion: Predicting the tooth size of cuspid and bicuspid group in malocclusion can't simply follow the law of normal occlusion.
结论：临床上对错尖牙、双尖牙组的预测不能简单等同于正常。
Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .
较常见的是尖牙和上颌切牙的埋伏阻生（第三磨牙除外）。
Impacted tooth frequently appears in upper cuspid and upper central incisors(except of the third molar) .
较常见的是尖牙和上颌切牙的埋伏阻生（第三磨牙除外）。
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