Abstract
Objectives
We evaluated the clinical utility of a three-dimensional computed tomography (3D-CT) system to assess changes in the symmetry of patients undergoing sagittal split ramus osteotomy (SSRO) for mandibular prognathism.
Methods
Nine patients who underwent SSRO for mandibular prognathism were analyzed before and after their treatment using a 3D-CT system that we developed for evaluating maxillofacial skeletal asymmetry. Asymmetry indices for selected landmarks were calculated before and after treatment and compared with those of normal controls. Three regions were assessed: the maxillary, mandibular body, and mandibular ramus regions. Based on these regional assessments before and after treatment, changes in asymmetry types were determined for each patient.
Results
The asymmetry index was frequently improved for tooth-related landmarks, whereas no changes were observed in the anterior nasal spine, orbitale, or porion. In the maxillary and mandibular body regions, all nine patients showed improvement or no change in asymmetry. Deterioration was observed only in the mandibular ramus region of three patients who had preoperative asymmetry in the maxillary region.
Conclusion
Our 3D-CT system is effective for postoperative evaluation of facial asymmetry in patients with mandibular prognathism.
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Maeda, M., Katsumata, A., Ariji, Y. et al. Changes in skeletal asymmetry after sagittal split ramus osteotomy for patients with mandibular prognathism: three-dimensional computed tomographic assessment. Oral Radiol 23, 10–15 (2007). https://doi.org/10.1007/s11282-007-0058-y
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DOI: https://doi.org/10.1007/s11282-007-0058-y