The survival rate for 93 implants in 45 patients with no RFs was 94.8%. Moraschini et al. [44] have exhibited in their systematic review, based on 7711 implants, similar SRs with cumulative mean values of 94.6%. Moreover, in the subcohort of our study, by 44 of the above 93, implants were performed immediate procedures (25 immediate implantations, 35 immediate restorations, 16 both of them) so the survival rate could be also correlated with studies tasking with immediate procedures as well [45,46,47].

Very encouraging results came out by a secondary implant placement in areas of previous removed implants. Only one implant was lost out of a total of 31, which translates to a survival rate of 96.8%. According to studies by Grossmann and Levin [12] and Greenstein and Cavallaro [48], survival rates ranged between 50 and 100%.

The timing of implant placement and prosthetic restoration showed no statistically significant influence in our study. A meta-analysis of Hartog et al. [41] showed a survival rate of 95.5% and no difference between immediate, immediate-delayed, and delayed implant placement in the esthetic zone. Schropp et al. [49] used CBCT technology to test the remaining vestibular bone in conventional implant placements and immediate procedures and came to no statistically significant differences regarding bone preservation. Esposito et al. [46] demonstrated an increased risk of implant failure in patients after immediate implant placement (9%) when compared to delayed implant placement (2%). In our study, we found no significant difference between delayed implant placement (n = 153, 91.9%) and immediate implant placement (n = 54, 90%) (p = 0.603). Finally, Rocci et al. [47] presented the results of a study looking at a 9-year follow-up of Brånemark implants with a survival rate of immediately loaded implants of 92.2% that was very similar to the results of this study.

We found no difference of survival rate between implants with and without augmentation procedures. The relative lower implant survival rate of implants with augmentation procedures (n = 113, 88.1%) compared to those without (n = 94, 95.7%) can be explained from the fact that the sites needed augmentation showed a significant bone loss that maybe cannot be compensated from the augmentation procedure.