Changes in the masseter muscle after curved osteotomy of the prominent mandibular angle

被引:15
作者
Li, Min
Gui, Lai
Liu, Jian Feng
Lin, Xin
机构
[1] Chinese Acad Med Sci, Plast Surg Hosp, Cranial Maxilla Facial Surg Ctr, Beijing 100041, Peoples R China
[2] HuangShi Aesthet Surg Hosp, Dept Traumat Aesthet Surg, Beijing 100011, Peoples R China
[3] Chinese Peoples Liberat Army Gen Hosp, Dept Neurosurg, Beijing 100853, Peoples R China
关键词
curved osteotomy; masseter muscle; prominent mandibular angle; ultrasonography;
D O I
10.1007/s00266-007-0084-5
中图分类号
R61 [外科手术学];
学科分类号
摘要
Background: This study aimed to explore the changes in the masseter muscle after curved osteotomy of the prominent mandibular angle and to supply guidance for resection of the mandibular angle. Methods: Ultrasonography was used to assess changes in the thickness of the masseter muscle after curved osteotomy for 10 patients (20 hemimandibles) at the 6-month following-up assessment. The measurements were performed under both relaxing and maximal clenching positions through three cross sections of the masseter muscle (planes A, B, and C). Plane A contains the line from the mouth angle to the ipsilateral ear lobe. Planes B and C are parallel planes above and below plane A with a distance of 1 cm between them. Results: No significant difference between the preoperative and postoperative thicknesses of the masseter muscle for planes A and B (p > 0.05) was found, but there was a significant difference (p < 0.05) for plane C. The postoperative thickness of the masseter muscle in plane C was reduced by 0.244 +/- 0.121 cm in the relaxing position and by 0.244 +/- 0.142 cm in the clenching position, which were respectively 19.22% +/- 7.785% and 15.404% +/- 7.648% of its original thickness. There was no significant difference in the contraction amplitude of the masseter muscle under maximal clenching (p > 0.05) for any of the three cross sections postoperatively. Conclusions: The masseter muscle around the mandibular angle becomes atrophied but without functional defect after curved osteotomy. Patients with prominent mandibular angles can be treated simply with curved osteotomy instead of masseter excision.
引用
收藏
页码:732 / 738
页数:7
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