Kohara Riku, Gomi Karen, Shin Young-Min, Moroi Akinori, Yoshizawa Kunio, Ueki Koichiro
Department of Oral and Maxillofacial Surgery, Division of Medicine, Interdisciplinary Graduate School, University of Yamanashi, Yamanashi, Japan.
Director of Dept. of Dentistry (Oral & Maxillofacial surgery), Dongsan medical center, Keimyung university, School of medicine, Dalgubeoldaero 1035, Dalseogu, Daegu, Korea.
Maxillofac Plast Reconstr Surg. 2025 May 21;47(1):10. doi: 10.1186/s40902-025-00466-9.
This study evaluated the zygomaticus major muscle and lip-closing force before and after orthognathic surgery. Sixty female patients with jaw deformities who underwent orthognathic surgery were included. Lip-closing force and computed tomography (CT) assessments were conducted preoperatively and 1 year postoperatively. Lip pressure was measured using the Lip De Cum LDC-110R® (Cosmos Instruments Co., Ltd., Tokyo, Japan). CT images were reconstructed using ProPlan CMF (Materialize, Belgium), and zygomaticus major muscle width and CT values were analyzed. To the best of our knowledge, no previous studies have employed CT values to assess muscles in the oral and maxillofacial area.
In both class II and class III females, postoperative zygomaticus major muscle width was significantly higher than preoperative values. In class II females, postoperative zygomaticus major muscle CT values were also significantly higher than preoperative values. Simple linear regression analysis with age as the dependent variable revealed significant associations between pre- and postoperative zygomaticus major muscle widths in both groups. Additionally, simple linear regression analysis with CT values as the dependent variable demonstrated significant associations with postoperative lip-closing force in both class II and class III females.
This study suggests that orthognathic surgery significantly modifies the zygomaticus major muscle morphology and function, impacting CT values.
本研究评估了正颌手术前后的颧大肌和闭唇力。纳入了60例接受正颌手术的女性颌骨畸形患者。在术前和术后1年进行闭唇力和计算机断层扫描（CT）评估。使用Lip De Cum LDC - 110R®（日本东京宇宙仪器有限公司）测量唇部压力。使用ProPlan CMF（比利时Materialize公司）重建CT图像，并分析颧大肌宽度和CT值。据我们所知，以前没有研究使用CT值来评估口腔颌面区域的肌肉。
在II类和III类女性中，术后颧大肌宽度均显著高于术前值。在II类女性中，术后颧大肌CT值也显著高于术前值。以年龄为因变量的简单线性回归分析显示，两组术前和术后颧大肌宽度之间存在显著关联。此外，以CT值为因变量的简单线性回归分析表明，II类和III类女性术后闭唇力与CT值之间存在显著关联。
本研究表明，正颌手术显著改变了颧大肌的形态和功能，影响CT值。
