Clinical Analysis of Treatment for Jaw Deformities at the Showa University Dental Hospital Over the Past Decade

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This retrospective study analyzed the treatment of jaw deformities in 651 cases who underwent surgical orthodontic treatment at the Showa University from 2002 to 2011.Our analysis found: More females (n = 402) than males (n = 249) were treated, with a male: female ratio of 1:1.6.The mean age of all patients (n = 651) at time of surgery was 26.6 years, and this mean has tended to increase in recent years.The most common presenting conditions were mandibular prognathism without other deformities of the jaw (64.1%), mandibular prognathism with asymmetry (18.9%), and maxillary protrusion (6.1%).Cases of maxillary protrusion, mandibular prognathism with open bite, and mandibular prognathism with asymmetry have increased in recent years.A combination of Le Fort I and horseshoe osteotomies were performed for two-jaw surgeries from 2008, and three-segment maxillary osteotomies were performed for arch reductions from 2009. These procedures tended to increase.The improvement in surgical orthodontic treatment and diagnostic imaging seems to have resulted in a diversification of operative procedures.