Comparison of Two Reeducation Methods in Children With Persistent Sleep Apnea, a Randomized Controlled Trial

Inclusion Criteria: participants must: * present signs of obstructive sleep apnea: snoring, apnea / respiratory pauses audible by the entourage (objectivized by a score, to the Pediatric Sleep Questionnaire (PSQ) , greater than or equal to 0.33- This questionnaire comprises twenty-two Questions and has a good sensitivity (83%) and specificity (87%) in screening for pediatric sleep apnea. * be programmed for adenoidectomy, tonsillectomy or adeno-tonsillectomy within 3 months (or more). Exclusion Criteria: participants should not: * present with a craniofacial syndrome nor a severe medical condition with complex medical management, * present with an abnormality of the neuromuscular tone (such as Duchenne myopathy or cerebral palsy) * receive orthodontic therapy during the study * have a class III malocclusion (mandibular prognathy type), for which a propulsion oral appliance is contraindicated because it may aggravate mandibular prominence. Maxillary deficiency is not a exclusion criterion. * A non-nutritive oral habit such as digital sucking (or pacifier) that persists because it interferes with oral reeducation and is a contraindication to orthodontic treatments. Children who have recently stopped such a habit may be included in the study.