Evaluation of Mandibular Hypoplasia in Patients With Hemifacial Microsomia: A Comparison Between Panoramic Radiography and Three-Dimensional Computed Tomography

Objective: To compare the accuracy of three-dimensional computed tomography (3D-CT) and panoramic radiography in the evaluation of mandibular hypoplasia in patients with hemifacial microsomia (HFM). Design: Retrospective study of imaging data. Setting: Images selected from the archives of the University of Tokyo Hospital. Subjects: Twenty patients with unilateral HFM who had undergone both panoramic radiography and 3D-CT in the same period. Method: Mandibular deformities were classified according to the Pruzansky classification; eight patients had Grade I deformity and 12 patients had Grade II deformity. Ramus heights were measured on both panoramic radiographs and 3D-CT. Main outcome measures: Magnification in panoramic radiographs and extent of mandibular asymmetry as estimated by the affected/unaffected side ratio based on two methods were examined. The Pearson product-moment correlation coefficient was used to estimate correlations between parameters. Results: The magnification of ramus heights on pan...