Objective: To compare effects of planter turbine drill and traditional chisel technique on removal of impacted mandibular third molars. Methords:Three hundred and thirey cases with impacted third molars of middle or low site were randomly assigned to two groups:test group including 160 cases received treatment of planter turbine drill; control group including 170 cases received treatment of traditional chisel technique. The duration of extraction and discomfort of the patients, and post-operational complications were determined and analyzed. Results:The test group had shorter duration of extraction, less discomfort, and less post-operational complications such as ache,swelling, limited opening of mouth, than those of the control group. Occurrences of dry socket and fracture of lingual alveolar bone were lower than the control(P < 0.01). Conclusion:The planter turbine drill has a superiority for application on extraction of impacted third molars compared with traditional chisel technique.