Objective:To investigate the efficacy of Transverse T-shaped crown amputation truncated crown extraction ver-sus bone chisel split crown extraction in the treatment of horizontal mandibular impaction.Methods:A retrospective analysis was conducted on the clinical data of 134 patients with horizontally impacted mandibular teeth.Grouped according to the actual treatment used,divided into the control group and the observation group,with 67 cases in each group.The control group was treated with bone chisel split crown extraction and the observation group was treated with Transverse T-shaped crown amputa-tion truncated crown extraction.The duration of surgery,degree of facial swelling,intraoperative bleeding,intraoperative open-ing,visual pain analog scale(VAS),interleukin 6(IL-6),tumor necrosis factor(TNF-α),malondialdehyde(MDA),superoxide dismutase(SOD),postoperative healing,and the occurrence of complications were recorded and compared between the two groups.Results:The observation group showed lower levels than the control group in surgical time,facial swelling,intraopera-tive blood loss,and intraoperative mouth opening(P<0.05).The observation group's VAS scores at 1,3,and 7 days postoper-atively were lower than the control group's(P<0.05).At 3 days postoperatively,the observation group had lower levels of IL-6,TNF-α,and MDA compared to the control group(P<0.05),and higher SOD levels(P<0.05).The observation group had a higher excellent healing rate than the control group(P<0.05).The observation group also had a lower complication rate than the control group(P<0.05).Conclusion:Compared with the bone chisel split crown extraction,the use of Transverse T-shaped crown amputation crown extraction for mandibular horizontal impaction can shorten the operation time,reduce the postoperative inflammation and stress reaction,and help reduce the patient's postoperative pain,which can help promote the postoperative wound healing,and the safety is better.