Comparison 5. Upper retainer versus no retention after treatment of maxillary impacted canines .

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
5.1 Stability: upper irregularity index	1	63	Mean Difference (IV, Fixed, 95% CI)	‐0.90 [‐1.33, ‐0.47]
5.2 Stability: upper intercanine width	1	63	Mean Difference (IV, Fixed, 95% CI)	‐0.30 [‐0.73, 0.13]
5.3 Stability: upper intermolar width	1	63	Mean Difference (IV, Fixed, 95% CI)	‐0.10 [‐0.53, 0.33]
5.4 Stability: upper arch length	1	63	Mean Difference (IV, Fixed, 95% CI)	0.30 [0.03, 0.57]
5.5 Stability: upper maximum rotation	1	63	Mean Difference (IV, Fixed, 95% CI)	‐1.70 [‐3.20, ‐0.20]