The osteogenesis distraction is an alternative that today corrects transverse deficiencies in upper and lower jaw, though its major use has been spread in the sagital and vertical dimension in the craniofacial area. The aim is to present the case of a patient, who is 11/8 years old, who had severe bimaxillary transversal and dento-alveolar discrepancy.

Method: After the clinical and radiological studies it is decided to do simultaneously surgery of medial mandibular osteotomy and positioning of medial distractor, also a Le Fort I and medial palatal osteotomy, and positioning of device with Hyrax screw to achieve the movement of expansion.

Results: The bimaxillary activation was done at the 6th postoperative day, by means of the activation of 1 mm per day of each distractor. The bimaxillary retention began at the 21st postoperative day. The orthodontic treatment began at the 3rd month after the removal of the mandibular distractor. The maxillary distractor remains in a minimal period of retention of 6 months for major stability.

Conclusion: In severe cases of transversal bimaxillary and dento-alveolar discrepancy, the osteogenesis distraction is an option which is necessary to consider as part of a treatment to achieve simultaneously good coordination of arches and dental alignment, within the traditional orthodontics methods like dental extractions, stripping and dental tipping. The specific planning is important for every case and together surgical and orthodontical work as well, in order to obtain better results for the patient.

Conflict of interest: None declared.