Objective To evaluate age-related changes in expression of HSP70 in odontoblasts of bicuspid teeth.

目的观察热休克蛋白（HSP）70在前磨牙成牙本质细胞表达的增龄变化特点。

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Objective: to observe the restoration and healing effects of implantation of natural non organic bone (NNB) in chronic periapical bone destruction of anterior teeth or bicuspid teeth.

目的：观察前牙、双尖牙慢性根尖周病变骨质破坏时，植入天然型无机骨(NNB)的修复与愈合效果。

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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。

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