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Table 4 Comparison of mean bone levels (means ± SD) at different follow-up intervals in different implants diameters groups (2.75 and 3.25 mm)

From: Narrow implants (2.75 and 3.25 mm diameter) supporting a fixed splinted prostheses in posterior regions of mandible: one-year results from a prospective cohort study

Diameter 2.75 mm  
 Follow-up Mean bone level changes (mm) (n = 69) 0–6 months (95% CI) (n = 67) 0–12 months (95% CI) (n = 67) p inter-groups
 Baseline 0.02 ± 0.07 −0.18 (−0.09; −0.27) −0.47 (−0.27; −0.67) p = 0.786
 6 months 0.20 ± 0.12 p intra-group
 12 months 0.49 ± 0.30 p < 0.0001 p < 0.0001
Diameter 3.25 mm
 Follow-up Mean bone level changes (mm) (n = 55) 0–6 months (95% CI) (n = 54) 0–12 months (95% CI) (n = 54)
 Baseline 0.00 ± 0.11 −0.22 (−0.10; −0.34) −0.48 (−0.25; −0.71)
 6 months 0.22 ± 0.14 p intra-group
 12 months 0.48 ± 0.33 p = 0.001 p < 0.0001