Post hoc removal of the single study on the forest plot’s left side, which was responsible for the heterogeneity, led to somewhat larger difference (4 studies; SMD = 0.70; 95% CI = 0.13 to 1.27; P = 0.03), which was now marginally statistically significant.
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Influence of elastomeric and steel ligatures on periodontal health during fixed appliance orthodontic treatment: a systematic review and meta-analysis.
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