Most food impaction happened in the interproximal of molars. The impaction types were mainly hybrid and vertical impaction, and only 9.7% was horizontalimpaction.
嵌塞部位以磨牙间隙为主，嵌塞类型以混合型和垂直型嵌塞为主，水平型所占比例为9.7%。
2
Objective:To investigate the superiority by using high speed air turbine drill in extraction of impacted mandibular teeth, especially in low mesioangular impaction and horizontalimpaction.