Clinical ArticlesCondylar and temporomandibular joint disc positions after mandibular osteotomy for prognathism☆
Section snippets
Patients
The 43 Japanese patients in this study presented with jaw deformities diagnosed as mandibular prognathism (n = 22), mandibular prognathism with mandibular asymmetry (n = 7), and mandibular prognathism with bimaxillary asymmetry (n = 14). At the time of orthognathic surgery, the patients ranged in age from 15 to 37 years, with a mean age of 23.0 years.
Surgery
Of the 43 patients in this study, 23 underwent bilateral SSRO (by the Obwegeser Dal-Pont method) for correction of their mandibular deformities.
Condyle position
Postoperatively, the highest point of the condyle was more anteroinferior than it was preoperatively in 52.5% of the joints that underwent IVRO and in 23.9% of the joints that underwent SSRO. However, no statistically significant difference was found between the 2 procedures (Fig 3).Similarly, no significant difference in the angle of the condylar long axis was
Discussion
The functional rehabilitation of patients is one of the treatment goals of orthognathic surgery. Therefore, the purpose of orthognathic surgery is not only to produce ideal occlusion, but to also possibly reduce TMJ symptoms.
Signs and symptoms of TMJ dysfunction were previously studied in patients with dentofacial deformities. Laskin et al8 reported that 14% (range, 0% to 75%) of patients had TMJ symptoms before orthognathic surgery. Kerstens et al9 reported that 16.2% of 480 patients with
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Address correspondence and reprint requests to Dr Ueki: Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Kanazawa University, 13-1 Takaramachi, Kanazawa 920-8641, Japan; e-mail: [email protected]