Objective To explore the effect of pure titanium post core in the restoration of tooth defect and its inffuence on dental aesthetics. Methods A total of 90 patients with tooth defect admitted to our hospital from January 2023 to December 2024 were selected, and they were divided into the control group and the observation group according to the order of admission, with 45 patients in each group. The control group was treated with conventional cobalt-chromium alloy post core for tooth defect restoration, and the observation group was treated with pure titanium post core for tooth defect restoration. The restoration success rate, dental aesthetics, restoration time, tooth adhesive strength, complication rate and treatment satisfaction were compared between the two groups. Results The restoration success rate of the observation group (97.78%) was higher than that of the control group (84.44%) (P<0.05). The dental aesthetics score of the observation group after treatment was higher than that of the control group (P<0.05). The restoration time of the observation group was shorter than that of the control group, and the tooth adhesive strength was higher than that of the control group (P<0.05). The incidence of complications in the observation group (2.22%) was lower than that in the control group (15.56%) (P<0.05). The treatment satisfaction of the observation group (95.56%) was higher than that of the control group (80.00%) (P<0.05). Conclusion Pure titanium post core has high application value in the restoration of tooth defect, which can improve the restoration success rate, enhance dental aesthetics, shorten restoration time, increase tooth adhesive strength, with a low incidence of postoperative complications and high patient satisfaction with treatment effect.