To explore the clinical therapeutic effect of additive manufacturing Ti-6Al-4V titanium alloy implants in dental implant restoration.

Retrospective analysis was conducted on 86 patients with posterior tooth loss treated in the Department of Stomatology, the Fifth Affiliated Hospital, Sun Yat-sen University, and the Department of Dental Implantation, the Affiliated Hospital of Guangxi Medical University from November 2020 to June 2022, with a total of 87 missing teeth. Among them, there were 43 cases in the test group, with 44 missing teeth, which were restored with Ti-6Al-4V titanium alloy implants made of self-developed additives. In contrast, another 43 cases in the control group, with 43 missing teeth, were restored with B & B implants (Italy) . The implant success rate, changes in bone tissue around the implant, gingival status, and chewing efficiency within six months after implantation were compared between the two groups with SPSS 23.0 at a significance level of 0.05.

In the test group, there was no implant loss, no redness or swelling of the gingiva, and the chewing function was normal after restoration. Two cases showed marginal bone loss, with a success rate of 95.5%. In the control group, two implants failed, and one case had a repeated loose of the abutment screw. The implant success rate was 93%, and there was no statistically significant difference in the success rate between the two groups (χ² = 0.237, P>0.05) ; The test group had no occlusal interference and food impaction after implant denture restoration, with good chewing function and a total effective rate of 100%. In the control group, one case had poor chewing function due to loose screw, with a total effective rate of 97.7%. There was no statistically significant difference in chewing function (χ² = 0.181, P>0.05) . The bone resorption around the implant was less than 0.6 mm at each follow-up time point in both the two groups, with no significant difference between them (t = 1.974, P>0.05) . Patient satisfaction with the restoration was 93.2% in the test group and 95.3% in the control group, which was not statistically different (χ² = 0.236, P>0.05) .

Additive manufacturing Ti-6Al-4V titanium alloy implant has achieved satisfactory short-term clinical outcomes in terms of success rate, chewing function and aesthetic effect in the restoration of missing posterior teeth, which can be applied clinically. However, its long-term clinical effect needs to be further observed.