Comparison 5. Metal‐free abutments compared to metal abutments supporting single crowns.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Abutment failure, 1 year	2	47	Odds Ratio (M‐H, Fixed, 95% CI)	7.63 [0.33, 177.14]
2 PPD implant, 1 year	2	47	Mean Difference (IV, Fixed, 95% CI)	‐0.22 [‐0.60, 0.16]
3 REC implant, 1 year	2	47	Mean Difference (IV, Fixed, 95% CI)	0.0 [‐0.22, 0.22]
4 Marginal bone level change mesial, 1 year	2	47	Mean Difference (IV, Fixed, 95% CI)	‐0.39 [‐0.43, ‐0.35]
5 Marginal bone level change distal, 1 year	2	47	Mean Difference (IV, Fixed, 95% CI)	‐0.05 [‐0.15, 0.04]