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

Abstract

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.