Evaluation of masticatory activity during unilateral single tooth clenching using muscle functional magnetic resonance imaging.
Evaluation of masticatory activity during unilateral single tooth clenching using muscle functional magnetic resonance imaging.
复制标题
使用肌肉功能磁共振成像评估单侧单牙咬紧过程中的咀嚼活动。
DOI：
10.1111/joor.12404
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Hattori Y.
中科院分区：
文献类型：
--
作者：
Okada C;Yamaguchi S;Watanabe Y;Watanabe M;Hattori Y.
咬紧牙过程中的咀嚼肌活动受到咬合模式的影响。然而，很少有研究对各种咬合条件下咬紧牙过程中的所有咀嚼活动进行同时评估。本研究的目的是利用肌肉功能磁共振成像（mfMRI）来评估咬合点的变化对单牙咬紧过程中咀嚼活动的影响。对 9 名健康志愿者进行了左侧单侧第一磨牙或第一前磨牙咬紧 1 分钟期间所有咀嚼肌活动指数的平均质子横向弛豫时间 (ΔT2) 的变化。咬合力保持在最大自愿咬紧力的40%。分别分析浅层和深层以及上头和下头的咬肌和翼外肌的 ΔT2 值。与左第一磨牙咬紧后相比，左第一前磨牙咬紧后，同侧深咬肌的 ΔT2 值显着较低，同侧翼外肌上头的 ΔT2 值显着较高。这些结果定量地表明，在单侧咬牙过程中，随着咬合接触点向前移位，同侧翼外肌上头的活动显着增加，同侧深层咬肌的活动显着减少。
Masticatory muscle activity during teeth clenching is affected by occlusal pattern. However, few studies have performed simultaneous evaluation of all masticatory activities during teeth clenching under various occlusal conditions. The aim of this study was to use muscle functional magnetic resonance imaging (mfMRI) to evaluate the effects of changes in occlusal point on masticatory activity during single tooth clenching. Changes in mean proton transverse relaxation time (∆T2) as an index of activity in all masticatory muscles during left unilateral clenching at the first molar or first premolar for 1 min were examined in nine healthy volunteers. Bite force was maintained at 40% of the maximum voluntary clenching force. The ∆T2 values of the masseter and lateral pterygoid muscles were analysed separately for superficial and deep layers, and for superior and inferior heads. The ∆T2 values for the ipsilateral deep masseter were significantly lower, and for the superior head of the ipsilateral lateral pterygoid muscles were significantly higher, after left first premolar clenching compared to left first molar clenching. These results quantitatively demonstrate a significant increase in activity of the superior head of the ipsilateral lateral pterygoid muscle and a significant decrease in activity of the ipsilateral deep masseter muscle with forward displacement of the occlusal contact point during unilateral tooth clenching.