Figure 1 | Scientific Reports

Figure 1

From: Mandibular advancement impairs swallowing ability more than head extension but less than mouth opening in the supine position

Figure 1

The four head and mandibular positions. (A) Neutral position: the ala-tragus line is perpendicular to the floor and the operating table. (B) Head extension position: 20-degree head extension from the neutral position. (C) Mouth-open position: 30 mm of interincisal distance in the neutral head position. (D) Mandibular advancement position: maximum mandibular advancement using a custom-made mandibular advancement appliance in the neutral head position.

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