Abstract
Objective: To report the 1-year implant survival and peri-implant outcomes of mandibular overdentures retained by four titanium-zirconium mini implants (Straumann® Mini Implant System), and to assess the influence of surgery and loading protocols on peri-implant outcomes.
Materials and Methods: A 2×2 factorial randomized clinical trial (RCT) tested the combined effects of two loading protocols (immediate or delayed) and two surgical approaches (flapless or flapped) on the success / survival of the mini implants, and peri-implant parameters (plaque, bleeding, sulcus depth, gingival position, and marginal bone loss). Outcomes were assessed up to 1-year after loading, and Generalized Linear Models were used to analyze longitudinal and within-patient clustered data.
Results: 296 implants were placed in 74 patients, with 73 patients completing 1-year follow-up. No implant failure or major biological complications were observed. After 1-year, there were no noticeable changes in plaque scores, and a reduction in bleeding scores were observed at the 6 month and 1-year follow-ups compared to baseline. Good stability was observed for the probing depth and gingival margin height measures. Overall mean marginal bone loss was 0.68 (±0.68) mm after three months and 0.89 (±0.75) mm after 1-year. The flapless protocol showed better results on soft tissue stability and health but a slightly higher risk for marginal bone loss.
Conclusion: The results of this RCT suggest that mandibular overdentures retained by this novel mini implant system is a safe and predictable treatment option in terms of implant survival and peri-implant outcomes, including when flapless surgery and immediate loading protocols are adopted.
Materials and Methods: A 2×2 factorial randomized clinical trial (RCT) tested the combined effects of two loading protocols (immediate or delayed) and two surgical approaches (flapless or flapped) on the success / survival of the mini implants, and peri-implant parameters (plaque, bleeding, sulcus depth, gingival position, and marginal bone loss). Outcomes were assessed up to 1-year after loading, and Generalized Linear Models were used to analyze longitudinal and within-patient clustered data.
Results: 296 implants were placed in 74 patients, with 73 patients completing 1-year follow-up. No implant failure or major biological complications were observed. After 1-year, there were no noticeable changes in plaque scores, and a reduction in bleeding scores were observed at the 6 month and 1-year follow-ups compared to baseline. Good stability was observed for the probing depth and gingival margin height measures. Overall mean marginal bone loss was 0.68 (±0.68) mm after three months and 0.89 (±0.75) mm after 1-year. The flapless protocol showed better results on soft tissue stability and health but a slightly higher risk for marginal bone loss.
Conclusion: The results of this RCT suggest that mandibular overdentures retained by this novel mini implant system is a safe and predictable treatment option in terms of implant survival and peri-implant outcomes, including when flapless surgery and immediate loading protocols are adopted.
Original language | English |
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Pages (from-to) | 769-782 |
Number of pages | 14 |
Journal | Clinical Oral Implants Research |
Volume | 34 |
Issue number | 8 |
Early online date | 31 May 2023 |
DOIs | |
Publication status | Published - Aug 2023 |
Keywords
- diagnosis
- clinical assessment
- clinical research
- dental implant
- clinical trials
- edentulous patient