Anatomical Factors

     and SAS
  a.1. Indications
         Oral Appliance
   a.3.1. AHI
   a.3.2. Sleep Quality 
   a.3.4. Snoring
   a.3.5. Blood Pressure
   a.3.6. Upper Airway 
             Resistance Syndrome
   a.3.7. Side Effects
   a.4.1. Anatomical Factors
   a.4.2. Functional Factors
   a.4.3. Sleep Position 
         Periodontal Disease
         Heart Disease
         Metabolic Syndrome
The most common sites of airway obstruction are thought to be behind the base of the tongue (retroglossal) and behind the soft palate (retropalatal). The appliance is significantly effective for patients who exhibit a tendency toward micrognathia and a short soft palate (Figures 14, 15) [19]. Since the appliance prevents the mandible from collapsing by advancing it, if other factors influence airway obstruction, the sleep apnea will not improve. Narrowing or obstruction are influenced by functional and anatomic factors. Anatomic factors include abnormally narrow airways, thick and long velum palatinum, tonsillar and adenoid hypertrophy, micrognathia and retrognathia, nasal insufficiency, fat infiltration of the oropharynx, open mandibular angle, hypertrophy and thickness of the tongue, and lowered hyoid bone [8].