评价女性骨骼 III 类错牙合畸形患者术前正畸治疗后面部形态变化与咬肌形态变化的相关因素。
Evaluation of factors related to morphological masseter muscle changes after preoperative orthodontic treatment in female patients with skeletal class III dentofacial deformities.
机构信息
Department of Oral and Maxillofacial Surgery, Graduate School of Medical Science, Kanazawa University, 13-1 Takaramachi, Kanazawa, Ishikawa, 920-8641, Japan.
Department of Physical Medicine and Rehabilitation, Kanazawa University Hospital, 13-1 Takaramachi, Kanazawa, Ishikawa, 920-8641, Japan.
出版信息
BMC Oral Health. 2022 Jul 17;22(1):292. doi: 10.1186/s12903-022-02319-7.
BACKGROUND
The purpose of the current study was to investigate factors related to morphological changes in the masseter muscle after preoperative orthodontic treatment in patients with skeletal class III dentofacial deformities for analysis of muscle changes and malocclusions.
METHODS
Twenty female patients with dentofacial deformities were included in the study. Computed tomography was performed before and after preoperative orthodontic treatment, and the lengths, widths, and cross-sectional areas of the masseter muscles were measured. Changes in these parameters were evaluated, and factors related to changes in masseter muscle area after preoperative orthodontic treatment were analyzed.
RESULTS
The lengths, widths, and areas of masseter muscles were significantly smaller after preoperative orthodontic treatment. Smaller masseter muscle area was significantly associated with changes in overbite and pretreatment values of SNA angle.
CONCLUSIONS
Atrophy of the masseter muscle during preoperative orthodontic treatment was greater in patients with increased open bite due to improved dental compensation in patients with skeletal class III dentofacial deformities with maxillary retraction.
背景
本研究旨在探讨术前正畸治疗后咀嚼肌形态变化的相关因素，分析咀嚼肌变化与错牙合畸形的关系。
方法
选取 20 例女性骨性 III 类错牙合畸形患者，进行术前正畸治疗前后的 CT 检查，测量咀嚼肌的长度、宽度和横截面积。评价这些参数的变化，并分析与术前正畸治疗后咀嚼肌面积变化相关的因素。
结果
术前正畸治疗后咀嚼肌的长度、宽度和面积均显著减小。较小的咀嚼肌面积与覆盖的变化和 SNA 角的治疗前值显著相关。
结论
上颌后缩的骨性 III 类错牙合畸形患者，由于牙齿代偿性的开牙合增加，术前正畸治疗中咀嚼肌萎缩更为明显。
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