Abstract
ObjectiveDistraction osteogenesis is an alternative treatment method for the correction of mandibular hypoplasia. In this case report, distraction with a multidirectional extraoral device was performed to gradually lengthen the corpus and ramus of a patient who had a severe hypoplastic mandible.Materials and methodsThe patient underwent bilateral extraoral ramus and corpus distraction osteogenesis. After seven days of latency period, distraction was performed 0.5 mm twice a day. Subsequent consolidation period was 12 weeks.ResultsThe patient's mandible was elongated successfully. Cephalometric analysis revealed that ANB angle decreased from 13° to 6°, overjet of 15 mm decreased to 4 mm, corpus length increased from 49 mm to 67 mm, and ramus length increased from 41 mm to 43 mm. Posterior airway space (PAS) also increased due to advancement of the mandible. In stereolithographic model evaluation it was determined that the distances from condylion to gonion and from gonion to pogonion increased.ConclusionSatisfactory results from both aesthetic and functional standpoints were obtained by distraction osteogenesis of the ramus and corpus.
Highlights
Satisfactory results from both aesthetic and functional standpoints were obtained by distraction osteogenesis of the ramus and corpus
Distraction osteogenesis (DO) is a biologic process of new bone formation between the surfaces of bone segments that are gradually separated by incremental traction [1]
DO was first introduced by Codivilla at the beginning of twentieth century and during 1950s, the studies of Ilizarov made a contribution in the development of the technique by elucidating the biological and mechanical principals in the formation of new bone [3,4,5]
Summary
No significant complications associated with the surgical procedure were encountered postoperatively. Pairs of pins to be secured; one pair to the ramus, the other to the angulus and the last one to the corpus region inferior to the mandibular canal During this procedure extraoral incisions and trochar were used. Inclination of the mandibular plane, and Y-axis decreased revealing the anterior rotation of the mandible. Elongation of the ramus length increased the posterior face height and anterior rotation of the mandible decreased the anterior face height. These alterations changed the profile of the patient and provided more symmetric and aesthetic appearance.
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