RESULTS

The study cohort of 2,060 patients and 4,591 implants was followed for up to 133 months, with a mean of 32.2 ± 26.8 months. The number of implants for each time period was; n = 2,372 at 2 to 3 years, n = 1,178 at 4 to 5 years, and n = 560 at 6 to 10 years. There were 32 implant failures resulting in cumulative survival rates of 99.3%, 99.0%, and 98.4% at 3, 5, and 7 years, respectively, as previously reported. Of 32 failures recorded, 22 occurred before loading. Of the 10 failures that occurred after loading, four implants were related to peri‐implantitis and six implants failed in relationship to biomechanical load. For the current analysis the 32 failing implants were excluded; therefore, the analyzed cohort included 4,559 implants. Bone measurements were performed at 3 months then at years 1, 2 to 3, 4 to 5, 6 to 7, and up to 8 to 10 years after installation. Over the study period, the mean CBL increased from 0.06 ± 0.22 mm at stage 2 to 0.44 ± 0.81 mm at 8 to 10 years. Throughout the study period, the median CBL was 0 mm. At 8 to 10 years, 15% of implants exhibited a CBL >1.02 mm and 5% exhibited a CBL >2.28 mm. The number of sites evaluated for each recall period (n, mean CBL ± SD) were: at stage 2, n = 4,524, CBL = 0.06±0.22; at 1‐year, n = 3,532, CBL = 0.13±0.31; at 2 to 3 years, n = 2,372, CBL = 0.16±0.37; at 4 to 5 years, n = 1,178, CBL = 0.21±0.45; at 6 to 7 years, n = 389, CBL = 0.34±0.62, and at 8 to 10 years, n = 171, CBL = 0.44±0.81.