Bilateral posterior crossbites are usually the result of an underdeveloped maxilla. Causal factors can included abnormal tongue posture, irregular swallowing pattern, and an obstructed airway due to allergies. The Standard Schwarz with Occlusal Coverage is ideal for addressing this condition. It is designed with a smooth posterior bite plane to allow the posterior teeth to move free of any occlusal interference.

Turning the expansion screw one-quarter turn a week exerts a slow, constant pressure on the teeth and bone. This develops the arch and moves both posterior segments buccally out of crossbite -- and drops a high vaulted palate, opening the nasal airway. As the palate drops, it will be necessary to adjust the palatal acrylic throughout treatment. Important: Recognition and treatment of a posterior crossbite early in a child’s development is essential. When left untreated, it can lead to numerous serious medical complications, e.g. Class II skeletal deformity, TMJ dysfunction, airway obstruction.