State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases & Dept. of Cleft Lip and Palate Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.
Dept. of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2024 Oct 1;42(5):636-643. doi: 10.7518/hxkq.2024.2024063.
This study aims to obtain a three-dimensional reconstruction model based on magnetic resonance imaging (MRI) data of patients with different degrees of unilateral cleft lip and analyze the anatomy and changes in multiple groups of nasolabial muscles under dynamic and static conditions.
One normal person and four adult patients with unilateral cleft lip were included, and MRI was performed under static (upper and lower lips closed naturally) and dynamic (pout and grin) conditions. 3D Slicer software was used to reconstruct the model and draw the anatomic morphology of nasolabial muscles. The distance between the junction (where the muscle merges into the orbicularis oris) of the levator muscle, zygomaticminor muscle, and zygomatic major muscle to the median sagittal plane, the starting point to the junction point, the dynamic and static junction points, and the angle between the connection of dynamic and static junctions and the horizontal plane were measured under three kinds of movements, and the ratio was calculated.
In all patients, under dynamic and static conditions, the distance from the muscle junction to the median sagittal plane, their ratios of the cleft side to the non-cleft side were all greater than 1. While the ratio of the distance from the starting point of the muscle to the junction point is less than 1. At static conditions, the two ratios of the same muscle increased gradiently with the severity of the cleft, and the ratio of the zygomatic minor muscle was prominent in the same patient. The ratio of the cleft side to the non-cleft side was greater than 1, and the value for comparison was the angle of the line from the static to the dynamic junction and the horizontal plane.
The symmetry of the insertion site of the orbicularis oris and the linear distance of both sides of the muscle are related to muscle and cleft types. The angle of muscle contraction on the cleft side is greater than that on the non-cleft side.
本研究旨在基于患者磁共振成像（MRI）数据获得三维重建模型，并分析不同程度单侧唇裂患者在动态和静态条件下多组鼻唇肌肉的解剖结构和变化。
纳入 1 名正常人及 4 名单侧唇裂成年患者，分别于静态（上下唇自然闭合）和动态（撅嘴和微笑）条件下进行 MRI 检查。使用 3D Slicer 软件对模型进行重建并绘制鼻唇肌肉的解剖形态。测量 3 种运动状态下提肌、颧小肌和颧大肌的肌起点至肌止点、肌止点至正中矢状面的距离，以及动态和静态止点间的距离和夹角，并计算比值。
所有患者在静态和动态条件下，肌止点至正中矢状面的距离、裂侧与非裂侧的比值均大于 1，而肌起点至肌止点的距离比值均小于 1。在静态条件下，同一肌肉的两个比值随着裂隙严重程度的增加呈梯度增加，且同一患者中颧小肌的比值更为显著。裂侧与非裂侧的比值大于 1，且比较值为从静态到动态止点的连线与水平面的夹角。
口轮匝肌止点的位置对称性和两侧肌的线性距离与肌肉和裂隙类型有关。裂隙侧肌肉收缩的角度大于非裂隙侧。
