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In order to identify trends among orthognathic surgery patients who visited the Department of Orthodontics at Aichi-Gakuin University Hospital for the 10 years from January 1999 to December 2008, we performed a statistical survey. We examined differences in the maxillofacial morphology of patients with anterior crossbite and maxillary protrusion who had orthognathic surgery or orthodontic treatment.The results were as follows:1. Among a total of 3,065 patients, the number of patients with jaw deformities was 295 (9.6%), comprising 127 (43.1%) male and 168 (56.9%) female patients.2. The average number of patients per year was 29.5.3. Anterior crossbite (147 cases, 49.9%) was the most prevalent condition, followed by anterior crossbite+ open bite (65 cases, 22.0%).4. The average age at diagnosis was 23y5m±7y1m. For males, it was 22y10m±7y0m, and for females, 23y10m±7y0m (mean±S.D.).5. The average ANB for jaw-deformity patients was −3.3±3.1° mandibular protrusion and +7.7±2.7° maxillary protrusion.6. The average overjet for jaw deformity patients was −2.7mm±3.0mm mandibular protrusion and 8.3mm ±3.7mm maxillary protrusion.

Investigation of Jaw-Deformity Patients over 10 Years in the Department of Orthodontics, Aichi-gakuin University Hospital