Table 1 Publications providing medium- and long-term data on the IMZ Implant System
Authors | Design | Mean observation time (years) | Patient selection | Type of restoration | Number of patients/implants | Drop-out (%patients/%implants) | Mean marginal bone loss (mm) | Peri-implantitis rate | Survival rate (implants) |
|---|---|---|---|---|---|---|---|---|---|
Kirsch & Ackermann 1989 | Retrospective | Not specified (1–10 years) | Patients with sufficient horizontal and vertical residual bone | SC, FDP, RDP | 1401/3088 | ?/334 (?/10.8%) | Not specified | Not specified | 97.8% (excluding drop out) |
Spiekermann et al. 1995 | Prospective | 5.7 | No special features | RDP | 125/264 | Not specified | 2–6 (depending on IMZ-implant type) | Not specified | > 90% (cumulative after 5 years) |
Noack et al. 1999 | Retrospective | Not specified (1–13 years) | Treatment between 1984 and 1997 | SC, FDP, RDP | 527/1250 | Not specified | Not specified | Not specified | 81% (cumulative, after 10 years) |
Willer et al. 2003 | Prospective | Not specified (1–13 years) | No special features | SC, FDP, RDP | 541/1250 | 89/136 (16.5%/10.9%) | Not specified | Not specified | 82.4% (cumulative, after 10 years) |
Meijer et al. 2003 | Prospective | 10 | - Edentulousness for at least one year - Problems with retention and stability of the lower denture | RDP | 29/58 | 1/2 (3.4%) | No mean values reported | Not specified | 93% (percentage implants lost) |
Meijer et al. 2009 | Prospective | 10 | - Severely reduced mandible -Edentulousness - Problems with retention and stability of the lower denture | RDP | 30/60 | 1/2 (3.3%) | 1.4 ± 1.1 | Not specified | 93% (percentage implants lost) |
Visser et al. (2016) | Prospective | 15 | - Treated between 1996 and 1999 -Edentulousness for at least 2 years - Functional problems | RDP | 40/160 | 20/80 (50%) | Not specified | Not specified | 88.7%-98.7% (percentage implants lost, range between subgroups) |
Our Findings | Retrospective | 28.3 | - Treated between 1981–1995 - Availability of baseline radiographs | SC, FDP, RDP | 94/199 | 79/167 (84%/83.9%) | 2.5 ± 1.8 | 9.4% | 79.5% |