Abstract
Objective: To present a clinical case of early loss (PP) of anterior deciduos tooth associated with a right functional unilateral posterior crossbite (MCPUFD), whose planning was to uncross the bite with a modified “W” arch concomitant with space maintenance. Case Details: A four-year-old patient, accompained by his mother, seeks emergency care at a municipal emergency room, with trauma to the face, presents the lesions of element 51 after the fall of a height bunk of approximately 1,5m, and when being examined, MCPUFD was also found. For the treatment, the modified “W” arch was chosen to uncross the MCPUFD and aesthetic maintenance of the anterior space. After ninety days of treatment, a corrected midline was found, with a good ratio of canines and posterior batteries and satisfaction with aesthetic aspect by the patient and responsible. Final considerations: It is concluded that the maintenance of space is of great importance for future occlusion, ins addiction to contributing to the improvement in self-esteem and that uncrossing the bite will always be procedure to be performed as early as possible.