Center of resistance of maxilla is at:

 # Center of resistance of maxilla is at:

A. Point A

B. Palatal suture

C. Above the roots of premolar

D. Maxillary tuberosity

The correct answer is C. Above the roots of  premolar.

In theory, the movement of the maxilla can be controlled in the same way as a single tooth is controlled: by managing forces and moments relative to the center of resistance of the jaw. In practice, it is difficult to analyze exactly where the center of resistance and center of rotation of the maxilla might be, but they are above the teeth and most likely above the premolar teeth. Directing the line of force closer to the center of resistance is another major reason for including an upward direction of pull for most children who have headgear force to the maxilla.

Reference: Contemporary Orthodontics, Proffit