Maxillary transversal deficiency is characterized by unilateral or bilateral posterior cross-bite, crammed and rotated teeth, and narrow palate. Classically, surgically assisted maxillary expansion is the indicated treatment for adult patients, affecting not only the skeleton, but also the teeth (especially the post of the expansion device), nasal cavity and air space, lips, and surrounding soft tissues. The aim of the present study was evaluate, using CBCT, dento-skeletal alterations of patients presenting atrophic maxilla who underwent surgically assisted maxillary expansion. The patients will be submitted to CBCT before and after the surgically assisted maxillary expansion using subtotal Le Fort I osteotomy technique and Hass expander appliance. Measurements of the buccal and palatal cortical bone width will be performed, along with the angulation of the long axis of the upper posterior teeth. Data will be tabulated for statistical treatment. The results showed that, even using Le fort I subtotal osteotomy, the teeth were displaced to a more buccal position and there were resorption of the buccal cortical around the teeth.

Conclusions: Even using Le Fort I subtotal osteotomy effects on the teeth and alveolar bone can occur.

Conflict of interest: None declared.