Abstract
To evaluate the long-term survival of short implants and to investigate the association of the Implant Disease Risk Assessment (IDRA) with the occurrence of biological complications. This study was designed as a cohort study with a median follow-up of 10.0years. Patients who had received 6-mm implants were reviewed and assigned into low-, moderate-, and high-risk groups (Group L, M, and H) based on the IDRA tool. The implant survival, biological complications, soft tissue condition, hardware complications, and marginal bone loss (MBL) were evaluated. Kaplan-Meier curves and Cox regression were performed for survival analysis. A hundred and ten patients were included. The overall cumulative survival rate was 90.9% (L:100.0%, M: 93.3%, and H: 80.6%). A higher risk profile was significantly associated with a decreased implant survival (hazard ratio: 4.11, 95% CI: 1.17-14.36, p<.05). Higher risk profile (hazard ratio: 2.63, 95% CI: 1.32-5.25, p<.05) was a potential risk factor for biological complications. At follow-up, significant differences in bleeding index, modified plaque index, and peri-implant probing depth were found among groups (p<.01). No significant difference was found in MBL. Acceptable long-term clinical outcomes could be achieved after 10years for short implants. Despite a statistically nonsignificant difference in MBL, patients with a high-risk profile of IDRA seem to be at greater risk of implant loss and biological complications.
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