Fig. 4From: The efficacy of analgesics in controlling orthodontic pain: a systematic review and meta-analysisResults of the meta-analysis. Pooled estimate of VAS scores of acetaminophen vs. placebo at 2 h(a), 6 h(b) and at 24 h(c) respectively after orthodontic treatment. The effect of pain relief is depicted as MD and its 95% CI. I 2 represents the amount of heterogeneityBack to article page