CoDAS
https://codas.org.br/article/doi/10.1590/2317-1782/e20250033en
CoDAS
Original Article

Effectiveness of a myofunctional therapy program in the treatment of mouth breathing in patients with dental malocclusion: a pilot clinical trial

Letícia Korb da Silva; Giovana Miranda de Brito; Asenate Soares de Matos Pereira; Licia Coceani Paskay; Giédre Berretin-Felix

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Abstract

ABSTRACT: Purpose: To verify the effectiveness of an orofacial myofunctional program aimed at treating respiratory function in adults with dental malocclusion.

Methods: Thirteen adults with Class II malocclusion undergoing orthodontic treatment participated in this pilot study, randomly divided into an experimental group (EG; n=9) and a control group (CG; n=4). Protocols for oral health-related quality of life (OHIP-14) and respiratory symptoms were applied. Respiratory function was assessed using the MBGR protocol. Additionally, maximum phonation time (MPT) of /s/, nasal peak inspiratory flow, and nasal airflow analysis using a metallic plate were measured.

Results: After the intervention, the EG showed statistically significant improvement in respiratory symptoms (p<0.001), MBGR score (p<0.001), respiratory type (p=0.041), respiratory mode (p=0.029), MPT (p=0.002), and nasal peak inspiratory flow (p=0.002). There were no changes in oral health-related quality of life for either group (p>0.05). Three months later, the EG maintained the results, while the CG showed worsening of respiratory symptoms (p=0.003) and MPT (p=0.013).

Conclusion: The orofacial myofunctional therapy program improved respiratory parameters in oral-breathing adults with malocclusion, with no impact on oral health-related quality of life.

Keywords

Mouth Breathing, Myofunctional Therapy, American Speech-language-hearing Association, Malocclusion, Angle Class II, Respiration

Referências

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Submetido em:
30/01/2025

Aceito em:
24/07/2025

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