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 bicuspidteeth.
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。
2
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。
3
Objective To evaluate age-related changes in expression of HSP70 in odontoblasts of bicuspidteeth.