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Clinical efficacy of lip repositioning technique and its modifications for the treatment of gummy smile: systematic review and meta-analysis

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Abstract

Objective

To systematically review the literature regarding the clinical efficacy of reducing excessive gingival display (EGD) using the surgical lip repositioning technique (LRT) and its modifications. The question to address was: “What is the clinical efficacy of the surgical LRT and its modifications in patients with EGD?”

Material and methods

Four databases (MEDLINE-PubMed, Scopus, EMBASE, and CENTRAL) were searched up to December 2021 (PROSPERO-CRD42020205987). Randomized, non-randomized controlled and prospective case series with a minimum of 6-month follow-up were eligible for inclusion. Two meta-analyses were performed using the mean difference (MD) between baseline and different follow-up periods (6 and 12 months). Subgroup analyses were performed using the different modifications of LRT.

Results

The electronic research retrieved 783 studies. Only 13 met the inclusion criteria and were included in the statistical analysis. Six modifications of the original LRT were identified. An overall EGD reduction of −3.06 mm (95%CI: −3.71–2.40), −2.91 mm; (95%CI: −3.66–2.15) and −2.76 mm; (95%CI: −3.83–−1.70) was achieved after 6, 12, and 36 months, respectively, compared to baseline (P < 0.01). Meta-analysis revealed that the use of LRT with periosteal suturing showed the greatest decrease in EGD with 5.22 mm (95% CI: 4.23–6.21; P < 0.01) at 6 months and 4.94 mm (95% CI: 3.86–6.02; P < 0.01) at 12 months.

Conclusions

Both the original LRT and its different modifications reduce EGD and provide good results and overall patient satisfaction at 6, 12, and 36 months of follow-up.

Clinical relevance

Evaluating the different modifications of the LRT can be a guiding aspect for the clinical and surgical approach to be used in patients with EGD.

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Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. All other funding was self-supported by the authors.

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Authors and Affiliations

  1. Department of Periodontology, School of Dentistry, Universidad Cientifica del Sur, Panamericana Sur Km 19, Villa, Lima, Peru

    Andrea Mendoza-Geng, Kelly Gonzales-Medina, Jonathan Meza-Mauricio & Andrea Vergara-Buenaventura

  2. Department of Periodontology, Graduate Program in Dentistry, Federal University of Pelotas, Pelotas, Brazil

    Francisco Wilker Mustafa Gomes Muniz

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  1. Andrea Mendoza-Geng
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  2. Kelly Gonzales-Medina
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Correspondence to Andrea Vergara-Buenaventura.

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Mendoza-Geng, A., Gonzales-Medina, K., Meza-Mauricio, J. et al. Clinical efficacy of lip repositioning technique and its modifications for the treatment of gummy smile: systematic review and meta-analysis. Clin Oral Invest 26, 4243–4261 (2022). https://doi.org/10.1007/s00784-022-04467-0

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