To investigate the clinical effect of Nobel implant system and Straumann implant system (soft tissue level implants) in repairing single mandibular posterior teeth after 5 years.

From January 2013 to December 2013, 60 patients with single mandibular posterior tooth loss in Department of Implant Repair of the First Affiliated Hospital of Zhengzhou University were selected as the study subjects, including 30 patients in group A (Nobel implant system) and 30 patients in group B (ITI Soft Tissue Level of Stroman System). All patients were followed up by non-embedding method for an average of 5 years. The alveolar bone loss was calculated by digital panoramic radiography 5 years after implant restoration in both groups. The number of cases of base loosening was counted and the implant effect of the two systems was evaluated.

In group A, 17 cases got some effects, and 11 cases had great effects, the total effective rate was 93.33%. In group B, 13 cases got some effrcts, and 16 cases had great effects, and the total effective rate was 96.43%. There was no significant difference in the total effective rate between the two groups (P>0.05). The average bone resorption at implant margin was (1.47±0.17) mm in group A, while that was (0.57±0.13)mm in group B, and there significant difference between the two groups (P<0.05). In group A, there were 2 cases of base loosening 5 years after implantation, the incidence was 6.67%; while in group B, 1 case had base loosening, and the incidence was 3.33%; there was no significant difference between the two groups in the incidence of base loosening (P>0.05).

There are some differences in bone resorption between the two implant systems, but the two implant systems can achieve good clinical efficacy. The appropriate implant system should be selected according to the actual situation of patients in order to ensure that patients get the best therapeutic effect.

Dental implant; Nobel implant system; Straumann implant system