Contribution of each masticatory muscle to the bite force determined by MRI using a novel metal-free bite force gauge and an index of total muscle activity.
Contribution of each masticatory muscle to the bite force determined by MRI using a novel metal-free bite force gauge and an index of total muscle activity.
复制标题
使用新型无金属咬合力计和总肌肉活动指数，通过 MRI 确定每块咀嚼肌对咬合力的贡献。
DOI：
10.1002/jmri.25223
复制
发表时间：
2016
影响因子：
4.4
通讯作者：
Hattori Y
中科院分区：
文献类型：
--
作者：
Takahashi M;Yamaguchi S;Fujii T;Watanabe M;Hattori Y
目的研制一种能在强磁场中监测咬合力的无金属咬合力测量仪，并分析咬合力与咀嚼肌总T2位移的相关性。10名受试者在各种咬合支持条件下（牙列完整、右磨牙缺失或左磨牙缺失）以40%的最大紧咬进行60 s等长咬合任务。在任务之前和之后立即用1.5特斯拉扫描仪拍摄自旋回波图像，以将咬合力与平均体素计数、横向松弛时间（ΔT2）的平均偏移和每个咀嚼肌的总T2偏移相关联。无论咬合情况如何（完整牙列：左侧，P= 0.007，右侧，P< 0.001;右侧磨牙缺失：左侧，P= 0.02，右侧，P= 0.021;左侧磨牙缺失：左侧，P= 0.022，右侧，P= 0.049）。相反，咬合力和平均ΔT2之间未检测到显著相关性（完整牙列：左侧，P= 0.102，右侧，P= 0.053;右侧磨牙缺失：左侧，P= 0.393，右侧，P= 0.868;左侧磨牙缺失：结论在咬合任务期间，使用无金属咬合力计测量总T2偏移是比平均ΔT2更敏感的个体肌肉活动指标。 J.磁共振《影像学》2016;44：804-813。
PurposeTo develop a metal‐free bite force gauge that can monitor the bite force in a strong magnetic field and to analyze the correlations between bite‐force and total T2 shift of the mastication muscles.Materials and MethodsThe gauge used a micro‐pressure sensor made of optical fiber. Ten subjects performed a 60‐s isometric bite task at 40% of maximum clenching in various occlusal support conditions (intact dentition, right molar loss, or left molar loss). Spin‐echo images were taken with a 1.5 Tesla scanner before and immediately after the task to correlate the bite force with the mean voxel count, mean shift in transverse relaxation time (ΔT2), and total T2 shift of each masticatory muscle.ResultsMeasurements of total T2 shift identified significant correlations between the bite force and activities of the superficial layer of the bilateral masseter muscle, regardless of the occlusion condition (intact dentition: left,P= 0.007 and right,P< 0.001; right molar loss: left,P= 0.02 and right,P= 0.021; and left molar loss: left,P= 0.022 and right,P= 0.049). In contrast, significant correlations were not detected between the bite force and mean ΔT2 (intact dentition: left,P= 0.102 and right,P= 0.053; right molar loss: left,P= 0.393 and right,P= 0.868; and left molar loss: left,P= 0.531 and right,P= 0.92).ConclusionMeasurement of total T2 shift using a metal‐free bite force gauge is a more sensitive index of individual muscle activity than mean ΔT2 during a bite task. J. MAGN. RESON. IMAGING 2016;44:804–813.