Assessment of ramus, condyle, masseter muscle, and occlusal force before and after sagittal split ramus osteotomy in patients with mandibular prognathism

Purpose The purpose of this study was to examine the relationship between the morphologies of the masseter muscle and the ramus and occlusal force before and after sagittal split ramus osteotomy (SSRO) in patients with mandibular prognathism. Patients and methods The study group consisted of 26 pati...

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Published in:Oral surgery, oral medicine, oral pathology, oral radiology and endodontics oral medicine, oral pathology, oral radiology and endodontics, 2009-11, Vol.108 (5), p.679-686
Main Authors: Ueki, Koichiro, DDS, PhD, Okabe, Katsuhiko, DDS, Mukozawa, Aya, DDS, Miyazaki, Mao, DDS, Marukawa, Kohei, DDS, PhD, Hashiba, Yukari, DDS, PhD, Nakagawa, Kiyomasa, DDS, PhD, Yamamoto, Etsuhide, DDS, PhD
Format: Article
Language:English
Subjects:
Adolescent
Adult
Biological and medical sciences
Bite Force
Cephalometry
Dental Stress Analysis
Dentistry
Female
Humans
Mandible - anatomy & histology
Mandible - diagnostic imaging
Mandible - pathology
Mandible - surgery
Mandibular Condyle - anatomy & histology
Mandibular Condyle - diagnostic imaging
Mandibular Condyle - pathology
Masseter Muscle - anatomy & histology
Masseter Muscle - diagnostic imaging
Masseter Muscle - pathology
Medical sciences
Orthognathic Surgical Procedures
Orthopedic surgery
Osteotomy
Otorhinolaryngology. Stomatology
Postoperative Period
Preoperative Period
Prognathism - diagnostic imaging
Prognathism - pathology
Prognathism - surgery
Surgery
Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases
Tomography, X-Ray Computed
Young Adult
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Summary:Purpose The purpose of this study was to examine the relationship between the morphologies of the masseter muscle and the ramus and occlusal force before and after sagittal split ramus osteotomy (SSRO) in patients with mandibular prognathism. Patients and methods The study group consisted of 26 patients with mandibular prognathism. All patients underwent bilateral SSRO as well as 3-dimensional computed tomography on which the masseter muscle, ramus, and condyle were measured preoperatively and at 1 year postoperation. Occlusal force and contact area were also recorded with pressure-sensitive sheets. Results In the cross-sectional area of the masseter muscle, there were no significant differences between the pre- and postoperative status. However, postoperative ramus width and area were significantly larger than preoperative values ( P < .0001). Postoperative right condylar area was significantly larger than the preoperative value ( P = .0120). Occlusal force and contact area 1 year after surgery were significantly larger than the preoperative values ( P = .0016, P = .0190). Conclusion This study suggested that the masseter muscle area did not significantly differ from preoperative status 1 year after SSRO, although occlusal force, contact area, and ramus area and width increased significantly 1 year after SSRO.
ISSN:1079-2104
1528-395X
DOI:10.1016/j.tripleo.2009.05.042