Snoring and obstructive sleep apnea syndrome (OSAS) are common disorders related with the narrowing of the upper airway. Several treatment have been proposed to treat obstructive sleep apnea (OSA) namely, nasal continuous positive airway pressure (nCPAP), surgical techniques, and use of intraoral appliances (OAs).  Oral appliances are basically mandibular repositioners (MRs) that advance the mandible and tongue base, increasing the space between the base of the tongue and the posterior pharyngeal wall.