ABSTRACT
The expansion of the maxilla is an old method used in orthodontics to correct the atrophic maxilla with posterior bilateral cross bite [1-8]. The expansion is obtained when a force applied to the dentoalveolar structures, by an orthodontic appliance, exceeds the limit for expansion, anticipating the cellular reaction of the periodontal ligament and favoring the dissipation of forces to the dentoalveolar structures and median palatine suture [9-16].
