Abstract: Objective To compare the clinical effects of traditional chisel method and high-speed air turbine drill method of extracting impacted mandibular wisdom teeth,and to evaluate the clinical feasibility and superiority of the high-speed air turbine drill method.Methods 500 patients with impacted mandibular third molars were randomly divided into 2 groups:test group and control group.260 cases (test group) used the highspeed air turbine drill and new instruments to extract the impacted mandibular third molars while other 240 cases (control group) used the bone chiseling and dental crown hacking method to extract the impacted mandibular third molars.The operation time and postoperative complications were observed and recorded to evaluate the effects of the two methods.Results The data showed that the operation time of the test group was obviously shorter than the control group (P＜0.05) .There was significant difference in the degree of pain and limitation of mouth opening degree(P＜0.05) after the operation between two groups.The incidence of alveolalgia of the test group was apparently lower than that of the control group.Conclusions The highspeed air turbine drill and new instruments method of extracting impacted mandibular wisdom teeth can efficiently shorten the operation time,reduce the incidence of complications,so it is worthy to be promoted and widely used.

Key words: Tooth extraction, Impacted mandibular third malor, Turbine drill , Dental chisel