IADR Abstract Archives
Clinical and Radiographic Changes at Short Implants in Atrophic Maxilla
Objectives: To evaluate the long-term clinical and radiographic changes of short implants placed in atrophic posterior maxilla supporting single crowns (SCs) and fixed dental prostheses (FDPs)
Methods: Seventy-six generally health patients with Straumann® Standard Plus SLA short implants (＜8.5mm ) placed in posterior maxilla were recruited after an observation period of 5-10 years. Thirty-five of the subjects with 39 implant-supported SCs and 41 subjects with 41 implant-supported FDPs were included in this study. All the FDPs were 2-3 units’ bridges supported by one short implant and a longer implant. Implant survival rate, clinical and radiographic parameters were evaluated and compared between implants supporting SCs and that of FDPs.
Results: The mean observation period was 7.8±3.2 years for SCs and 8.2±2.1 years for FDPs. A cumulative survival rate of 97.4% at implant level and 97.1% at subject level were achieved for the SC group. No implant loss occurred in the FDPs group, yielding a 100% survival rate. The mean radiographic bone levels at baseline were 1.92±0.23mm for short implants in the SC group, 1.98±0.12mm for short implants in the FDP group and 2.03±0.32mm for longer implants in the FDP group. At the follow-up visit, the bone level values increased to 2.34±0.62mm, 2.15±0.72mm and 2.20±0.56mm, correspondingly. No significant differences could be found at baseline and at the follow-up examination between the three groups. In addition, mean changes in modified plaque index, pocket probing depth, and modified bleeding index were not statistically significant between the groups.
Conclusions: Short implants are a viable alternative option in atrophic maxilla. Splinting to longer implants does not appear to be a prerequisite for preventing excessive marginal bone resorption or even failure of short implants.
Methods: Seventy-six generally health patients with Straumann® Standard Plus SLA short implants (＜8.5mm ) placed in posterior maxilla were recruited after an observation period of 5-10 years. Thirty-five of the subjects with 39 implant-supported SCs and 41 subjects with 41 implant-supported FDPs were included in this study. All the FDPs were 2-3 units’ bridges supported by one short implant and a longer implant. Implant survival rate, clinical and radiographic parameters were evaluated and compared between implants supporting SCs and that of FDPs.
Results: The mean observation period was 7.8±3.2 years for SCs and 8.2±2.1 years for FDPs. A cumulative survival rate of 97.4% at implant level and 97.1% at subject level were achieved for the SC group. No implant loss occurred in the FDPs group, yielding a 100% survival rate. The mean radiographic bone levels at baseline were 1.92±0.23mm for short implants in the SC group, 1.98±0.12mm for short implants in the FDP group and 2.03±0.32mm for longer implants in the FDP group. At the follow-up visit, the bone level values increased to 2.34±0.62mm, 2.15±0.72mm and 2.20±0.56mm, correspondingly. No significant differences could be found at baseline and at the follow-up examination between the three groups. In addition, mean changes in modified plaque index, pocket probing depth, and modified bleeding index were not statistically significant between the groups.
Conclusions: Short implants are a viable alternative option in atrophic maxilla. Splinting to longer implants does not appear to be a prerequisite for preventing excessive marginal bone resorption or even failure of short implants.