Objetctive: To study and compare the effect of the surgical time and complications of extracting lower-third-molar by high speed air turbing handpiece and by hammer &chisel.

• 目的研究比较高速涡轮牙钻磨牙去骨法与锤凿劈牙去骨法拔除下颌阻生智齿对手术时间和并发症的影响。