The evaluation of the effect of the occlusion on the masticatory muscle using H-MRI and P-MRS.

使用 H-MRI 和 P-MRS 评估咬合对咀嚼肌的影响。

• 批准号: 21592389
• 负责人: CHIKUI Toru
• 金额: $ 2.66万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2009
• 资助国家: 日本
• 起止时间: 2009 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-21592389/
• 关键词: 咬筋; 拡散テンソル; T2値; 拡散; 異方性; 筋線; 拡散異方性; 開閉口; 深層; 浅層; 咬合; T1時間; T2時間; 筋線維; 血流量

We evaluated the effects of various task like jaw opening, jaw closure and tooth contact on the masseter muscle by using both MRI and MRS. The eigenvalues of the diffusion tenser were affected by the jaw position. Moreover, recruitment of the specific muscle fibers within the masseter muscle was reflected in differing changes at the different position. The T 2 of the masseter muscle was expected to decrease with contraction because the increased intramuscular pressure caused the decrease of per fusion and to increase rapidly after the contraction, because of the reactive hyperemia. After the rapid increase, it decreased gradually. Finally, we evaluated the Pi/PCr ratio, which was indicative of the concentration of ADP by using 31P-MRS. It increase during tooth contact, however, it decrease immediately after tooth contact, and after 5 minutes, it declined to the same level as at rest.

我们使用 MRI 和 MRS 评估了各种任务（如下颌张开、下颌闭合和牙齿接触）对咬肌的影响。扩散张量的特征值受颌位置的影响。此外，咬肌内特定肌纤维的募集反映在不同位置的不同变化。咬肌的 T 2 预计会随着收缩而降低，因为肌内压力增加导致灌注量减少，并且由于反应性充血，在收缩后会迅速增加。急剧增加后又逐渐减少。最后，我们使用 31P-MRS 评估了 Pi/PCr 比率，该比率表示 ADP 的浓度。在牙齿接触期间它会增加，但在牙齿接触后它会立即下降，5分钟后，它会下降到与静止时相同的水平。

项目成果

Assessment of the sequential change of the masseter muscle by clenching: A quantitative analysis of T1, T2, and the signal intensity of the balanced steady-state free precession

评估咬紧牙肌的顺序变化：T1、T2 和平衡稳态自由进动信号强度的定量分析

• DOI: 10.3109/02841851003702180
• 发表时间: 2010-06-09
• 期刊: Acta Radiologica
• 影响因子: 1.3
• 作者: T. Chikui;T. Shiraishi;K. Tokumori;Daisuke Inatomi;M. Hatakenaka;K. Yuasa;K. Yoshiura
• 通讯作者: K. Yoshiura

Assessment of masseter muscle bydiffusion tensor Imaging

咬肌弥散张量成像评估

• 发表时间: 2011
• 作者: Shiraishi T; Chikui T; et al
• 通讯作者: et al

咬合による咬筋のT_1値、T2_値、balanced SSFPの信号強度の変化の検討

检查由于遮挡引起的咬肌T_1值、T2_值和平衡SSFP信号强度的变化

• 发表时间: 2010
• 作者: 筑井徹

Effect of clenching on T2 and diffusion parameters of the masseter muscle

紧握对咬肌 T2 和扩散参数的影响

• 发表时间: 2010
• 作者: Toru Chikui; et al.
• 通讯作者: et al.

Evaluation of diffusion parameters of the masseter muscle at rest, opening and during clenching

评估咬肌在休息、张开和咬紧时的扩散参数

• 发表时间: 2010
• 作者: Shiraishi T; Chikui T; Yoshiura K; Yuasa K.
• 通讯作者: Yuasa K.