- 作者：Koichiro Ueki ; kueki@yamanashi.ac.jp" class="auth_mail" title="E-mail the corresponding author ; Kunio Yoshizawa ; Akinori Moroi ; Ran Iguchi ; Akihiko Kosaka ; Hiroumi Ikawa ; Takamitsu Tsutsui ; Yuriko Saida ; Asami Hotta
- 关键词：Sagittal split ramus osteotomy ; Mandibular body height ; Computed tomography
- 刊名：Journal of Cranio-Maxillofacial Surgery
- 出版年：2016
- 出版时间：March 2016
- 年：2016
- 卷：44
- 期：3
- 页码：279-284
- 全文大小：613 K
Subjects and methods
The subjects were 49 patients (98 sides) who underwent bilateral SSRO surgery. The subjects were divided into 4 groups as follows, setback (shortening) sides in mandibular prognathism (Prog S group; n = 42), advancement (lengthening) sides in mandibular retrognathism (Retro L group; n = 24), setback (shortening) sides in mandibular asymmetry (Asym S group; n = 16) and advancement (lengthening) sides in mandibular asymmetry (Asym L group; n = 16). Postoperative computed tomography (CT) was analyzed for all patients pre-operatively, and at 1 week and 1 year postoperative. Mandibular body height at the site of the fixation plate, mandibular upper height above the plate and mandibular lower height under the plate were measured by 3-dimensional (3D) CT.
Results
There were no significant differences in mandibular height between the lengthening and shortening sides in mandibular prognathism, retrognathism and asymmetry in the time-course change. Upper mandibular height at the mid-point of the fixation plate after 1 year was significantly smaller than that after 1 week in all sides (P < 0.05).
Conclusion
This study suggested that slight bone resorption could occur at the upper site of a fixation plate after set back and advancement SSRO.