For the model of upper first molar, the RFDR with bony defects at buccal side, palatal side, mesial side and distal side were 5.5%, 2.3%, 17.2% and 23.1%, respectively.

• 上颚第一大臼齿在模拟颊侧、颚侧、近心侧与远心侧单侧齿槽骨缺损时，共振频率减少的比率分别为5.；5%25、2