Objective:To investigate the clinical effect of ICam4D photogrammetric in the final impression of full arch implant restoration.Methods:A total of 30 patients with full arch implant restoration were selected for final restoration.In the control group and the experimental group,15 patients in each group were treated with traditional splint impression technology to obtain silicone rubber window impression and ICam4D photogrammetry technology to obtain digital impression to complete the final fixed denture restoration.The patients filled in the visual analog scale(VAS)for impression making comfort and prosthesis satisfaction.The differences in impression making time,patient comfort,prosthesis placement and edge fitness,prosthesis satisfaction and follow-up were compared between the two groups,and the clinical effects of ICam4D photogrammetry in full arch implantation and fixation were evaluated.Results:All the final prostheses were placed accurately and passively,and the edge fit was grade I.The time of impression making in the experimental group(15.67±2.77)min was significantly lower than that in the control group(51.47±5.88)min,and the difference was statistically significant(P<0.05).The impression comfort(VAS)score of the experimental group(94.60±13.64)was significantly higher than that of the control group(55.13±13.64),and the difference was statistically significant(P<0.01).There were no significant differences between the two groups in the prosthesis chewing,aesthetic and pronunciation satisfaction(VAS)scores(P>0.05).In the follow-up of the two groups,screw loosening and fracture rate and stent fracture rate were 0%,and the success rate of implant was 100%.Conclusion:The application of ICam4D photogrammetry technology in the final impression of full arch implant restoration can save the chair-side operation time,improve patient comfort,and meet clinical needs with accurate performance,with good clinical prognosis.