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From Dental Appliances to Airway Orthotics...
¨In September 1995 the American Academy of Sleep Medicine announced that Oral Appliance Therapy is one of 3 currently accepted treatment modalities. ¨Since 1995 research has further solidified the effectiveness of this treatment alternative. A 256 patient study conducted by Yoshida demonstrated a 90% patient compliance after 2 ½ years of wear. All patients had a Pre and Post Polysomnogram. Yoshida et al CRANIO 2000:18:2
In 1995 the American Academy of Sleep Medicine stated;
¨In supine position the tongue tends to fall back to partially obstruct the airway resulting in snoring. Total Airway Obstruction leads to Sleep Apnea and snoring
Oral Appliance Therapy
An oral appliance repositions and retains the mandible in a forward position. It is believed that this forward repositioning pulls the tongue forward and out of the airway and also causes dilation and splinting of the pharynx.
Airway Orthotics—The Evolution of a Name Airway Orthotics. What are they, where did the name originate and what does it mean? First, there was the name, Dental Appliance; since these appliances are fabricated by a Dentist, this name seemed appropriate. However, the common consensus was, how can a Dental Appliance treat a Sleep Problem? Then came the name, Oral Appliance; this eliminated the misleading Dental term; however, it still did little to explain the function of the appliance. Next in the evolutionary chain was the name, Airway Dilator; this name was introduced with much excitement. Finally, a name that accurately described the function of the appliance. But even this name fell short. To accurately describe the function of these appliances, we must first agree on what this function is. Dilation of the airway is undoubtedly one of their functions, this has been demonstrated with MRI’s in the literature. However, to be successful, they must also fulfill another function, that of airway splinting. The name Airway Dilator provides no indication that it works by splinting the airway thus preventing it from collapsing. Although the mechanism by which these appliances work clearly involves both dilation and splinting of the airway. We still do not know what other mechanisms may underlie successful therapy with an appliance. Clearly then, the best name should not be tied to a particular mechanism. If we put aside specific mechanisms, these appliances work by making a pathological airway behave like a healthy airway. Thus the name Airway Orthotic. This name is not tied to a particular mechanism that may only partially describe how the appliance works, but rather, it concisely describes exactly what the appliance does; It makes the airway behave “Ortho” or correctly. Through the use of Acoustic Pharyngometry, we can access exactly how an airway behaves in the awake patient. The most current thinking in this area, involves determining if manipulating mandibular posture with an Airway Orthotic can make a pathological airway behave like a healthy airway, and how success in the awake state relates to successful Orthotic therapy in the sleep state. Research in this area has demonstrated a link between behavior of the awake orthotic manipulated airway and ultimate orthotic success. Currently, we are continuing to conduct research to further validate this relationship. Airway Orthotic most accurately represents what these appliances actually do. No matter what we learn about the mechanism by which they work, they will most certainly still be making the airway behave “Ortho”
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