What effect does mandibular setback have on airway as described by Santagata?

What effect does mandibular setback have on airway as described by Santagata?

• A. It relaxes the tongue muscles
• B. It stretches suprahyoid muscles
• C. It increases airway diameter significantly
• D. It elevates the hyoid bone

Answer: (B)

The airway changes are driven by the tongue–hyoid complex, which is anchored to the mandible by the suprahyoid muscles. When the mandible is moved backward (setback), the distance between the mandible and the hyoid increases, lengthening and stretching the suprahyoid muscles (geniohyoid, mylohyoid, and related fibers). That stretching alters the tension and position of the hyoid bone and tongue, which can reduce the posterior airway space. Santagata described this effect as the mandible setback stretching the suprahyoid muscles, a direct mechanical change that helps explain how airway dimensions can be affected. It’s not about the hyoid being lifted or the tongue relaxing as the primary mechanism, and the notion of a substantial increase in airway diameter contradicts the typical effect of setback.

The airway changes are driven by the tongue–hyoid complex, which is anchored to the mandible by the suprahyoid muscles. When the mandible is moved backward (setback), the distance between the mandible and the hyoid increases, lengthening and stretching the suprahyoid muscles (geniohyoid, mylohyoid, and related fibers). That stretching alters the tension and position of the hyoid bone and tongue, which can reduce the posterior airway space. Santagata described this effect as the mandible setback stretching the suprahyoid muscles, a direct mechanical change that helps explain how airway dimensions can be affected. It’s not about the hyoid being lifted or the tongue relaxing as the primary mechanism, and the notion of a substantial increase in airway diameter contradicts the typical effect of setback.