The rhinometer test is performed first, in order to check the nasal passages. This tool helps rule out any obstruction or enlargement in the turbinates as the cause of your sleep disordered breathing problem. If an obstruction or enlargement is discovered, your dentist will refer you to an Ear, Nose and Throat specialist right away.
The pharyngometer is used to map the cross sectional diameter of the oral airway and measure its stability. This allows the dentist to discover existing points of obstruction as well as your optimal breathing position.
In addition, the pharyngometer is instrumental in determining your eligibility regarding successful oral appliance therapy.