1. Effects of the changes in the condylar long axis angle and condylar position on temporomandibular symptoms after intraoral vertical ramus osteotomy: a preliminary study
- Author
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Hiromi Rokutanda, Haruka Kohara, Yukiko Morita, Emi Moriuchi, Airi Ino-Kondo, Satoshi Rokutanda, Takuya Nakamura, Souichi Yanamoto, Tomoko Yoshimi, Masako Yoshimatsu, Masahiro Umeda, Shin-ichi Yamada, and Hiroshi Sakamoto
- Subjects
Cephalometry ,medicine.medical_treatment ,Osteotomy, Sagittal Split Ramus ,Computed tomography ,Mandible ,Axial rotation ,Condyle ,Pathology and Forensic Medicine ,03 medical and health sciences ,0302 clinical medicine ,stomatognathic system ,medicine ,Humans ,Internal fixation ,Radiology, Nuclear Medicine and imaging ,Dentistry (miscellaneous) ,skin and connective tissue diseases ,Orthodontics ,Long axis ,medicine.diagnostic_test ,business.industry ,Mandibular Condyle ,Vertical ramus osteotomy ,030206 dentistry ,Position (obstetrics) ,030220 oncology & carcinogenesis ,JAW DEFORMITY ,Prognathism ,Surgery ,sense organs ,Oral Surgery ,business - Abstract
Objective This study was conducted to characterize the effects of the changes in the condylar long axis and position on temporomandibular symptoms with respect proximal segment position after intraoral vertical ramus osteotomy (IVRO). Study Design Twenty Japanese patients with diagnosed jaw deformity underwent IVRO without internal fixation. Long-term changes in condylar long axis and position were assessed during postoperative follow-up examinations by using computed tomography, and t tests were performed for comparison. In addition, changes in temporomandibular symptoms were examined. Results The degree of axial rotation of the proximal segment changed significantly when the proximal segment was located laterally. Downward changes in condylar position significantly differed when the proximal segment was located posterolaterally. Forward changes in condylar position significantly differed when the proximal segment was located laterally; moreover, when the proximal segment was located laterally, temporomandibular symptoms disappeared. Conclusions Lateral location of the proximal segment may be an important factor in the positive effects of IVRO, with respect to temporomandibular symptoms.
- Published
- 2019