Effectiveness of lip repositioning surgeries in the treatment of excessive gingival display: A systematic review and meta‐analysis

To synthesize the available evidence regarding lip repositioning surgery (LRS) and quantify the short‐ and long‐term reduction in excessive gingival display (EGD) with the procedure. Additionally, evaluate the effect of myotomy on the results. Seven electronic databases were searched up to May 2020 by two independent reviewers. Studies evaluating the exclusive use of LRS to treat EGD were included. After risk of bias assessment, the data were quantitatively evaluated with random‐effects meta‐analysis. The initial database search yielded 368 studies, of which 16 were selected for full‐text review. Finally, eight studies were included. The random effects model exhibited an EGD reduction of 2.87 mm (95% CI: 1.91–3.82) after 3 months of LRS. These results decreased after 6 months (2.71 mm; 95% CI: 1.95–3.47) and 12 months (2.10 mm; 95% CI: 1.48–2.72). Meta‐analysis comparing the performance of myotomy showed greater EGD reduction at 6 months than without myotomy (P