Objective To analyze the effect of digital intraoral scanning impression technology on implant success rate and restoration adaptability in patients with severe periodontitis. Methods A total of 70 patients with severe periodontitis admitted to our hospital from December 2022 to December 2024 were selected, and they were divided into the reference group and the experimental group by the random number table method, with 35 patients in each group. The reference group adopted traditional silicone rubber impression technology, and the experimental group adopted digital intraoral scanning impression technology. The impression taking time, number of restoration adjustments, pain intensity, implant success rate, restoration adaptability, patient satisfaction and postoperative complication rate were compared between the two groups. Results The impression taking time, number of restoration adjustments and pain intensity score of the experimental group were better than those of the reference group (P<0.05). The implant success rate of the experimental group was 100.00%, which was higher than 88.57% of the reference group (P<0.05). The marginal adaptation, occlusal relationship and adjacent relationship adaptability of the experimental group were higher than those of the reference group (P<0.05). The patient satisfaction of the experimental group (97.14%) was higher than that of the reference group (82.86%) (P<0.05). The incidence of postoperative complications in the experimental group (2.86%) was lower than that in the reference group (20.00%) (P<0.05). Conclusion The application of digital intraoral scanning impression technology in oral implant restoration of patients with severe periodontitis can shorten the impression taking time, reduce pain, lower the incidence of postoperative complications, decrease the number of restoration adjustments, and simultaneously improve the implant success rate, restoration adaptability and patient satisfaction.