Mouth Closing to Improve the Efficacy of Mandibular Advancement Devices in Sleep Apnea.

Mouth breathing increases upper airway collapsibility, leading to decreased efficacy of obstructive sleep apnea (OSA) treatments. We hypothesized that the use of mandibular advancement devices (MAD) increases mouth breathing, and thus, using an adhesive mouthpiece (AMT) to prevent mouth breathing in combination with MAD can improve the treatment efficacy. To evaluate the efficacy of MAD + AMT in comparison with MAD alone.