Effect of clenching on t<sub>2</sub> and diffusion parameters of the masseter muscle

Chikui, Toru; Shiraishi, T; Ichihara, Takahiro; Kawazu, Toshiyuki; Hatakenaka, Masamitsu; Kami, Yukiko; Yuasa, Kenji; Yoshiura, Kazunori

doi:10.3109/02841850903280508

Cited by 11 publications

(13 citation statements)

References 23 publications

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“…Chikui et al 21 showed that the variation of bite force had no influence on the diffusion parameters of the masseter muscle. In this study, there is no method for conducting the chewing and for monitoring the bite force during MRI examination; therefore, this study focused on the effect of the distribution of the bite force by static clenching in the intercuspal position on the diffusion parameters.…”

Section: Discussionmentioning

confidence: 99%

“…Owing to intolerability of some volunteers to the discomfort caused by the opening aid device, only 23 volunteers underwent the 3D BRAVO sequences with their mouth opened. The 15 min of jaw rest before the entire MR examination and the 15 min of jaw rest between the second and third DTI acquisitions was determined by the previous study performed by Chikui et al 21 …”

Section: Methodsmentioning

confidence: 99%

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In vivomorphological and functional evaluation of the lateral pterygoid muscle: a diffusion tensor imaging study

Liu¹,

Wang²,

Ai³

et al. 2016

BJR

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Objective: To explore the feasibility of morphological and functional evaluation of the lateral pterygoid muscle (LPM) by diffusion tensor imaging (DTI) in vivo. Methods: 30 healthy volunteers underwent DTI with the jaw in the rest position, opening and clenching. Diffusion parameters of the superior head of the LPM (SHLP) and the inferior head of the LPM (IHLP) at different jaw positions were calculated. Results: When the jaw was in the rest position, l 3 of the SHLP was significantly lower than that of the IHLP; fractional anisotropy (FA) value of the SHLP was significant higher than that of the IHLP. There was no significant difference in l 1 , l 2 and apparent diffusion coefficient (ADC) value. During jaw opening, there was significant increase of all three eigenvalues and ADC value, and significant decrease of FA value both at the SHLP and IHLP. Clenching caused a significant increase in the ADC and all three eigenvalues, and caused a significant decrease of FA at the SHLP. However, at the IHLP, the variations of all diffusion parameters by clenching in the intercuspal position showed no significance when compared with those at rest. Conclusion: The morphological and functional changes of LPM fibres caused by jaw movements could be sensitively detected by DTI which may serve as a new and noninvasive method for simultaneously investigating the functional and morphological features of the LPM during jaw movement. Advances in knowledge: A new application of DTI is proposed for the morphological and functional evaluation of the LPMs. The results show that the significant change of three eigenvalues indicates the activity of the LPM in a specific jaw movement, a finding that shows the potential value of DTI serving as a new and non-invasive method for investigation of the LPM.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

In vivomorphological and functional evaluation of the lateral pterygoid muscle: a diffusion tensor imaging study

Liu¹,

Wang²,

Ai³

et al. 2016

BJR

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“…The authors previously demonstrated that an MTC imaging technique strongly reflects the masticatory muscle edematous changes, possibly leading to masseter muscle pain, but not TMJ pain [27]. MRS and diffusion tensor imaging provide information on muscle metabolism associated with masticatory muscle pain and fatigue [28,29].…”

Section: Discussionmentioning

confidence: 98%

“…Recently, MR sequences such as magnetization transfer contrast (MTC) imaging [27], magnetic resonance spectroscopy (MRS) [28], diffusion tensor imaging [29], and ultrasonography [30] have been applied to evaluate associated masticatory muscular pathological changes such as edema and fibrosis.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the relationships between contrast-enhanced magnetic resonance characteristics and joint pain in patients with temporomandibular disorders

et al. 2015

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Objectives To evaluate the correlations between temporomandibular joint (TMJ) pain and both conventional and gadolinium-enhanced magnetic resonance (MR) imaging characteristics in patients with temporomandibular disorders (TMDs). Methods T1-weighted, T2-weighted, and fat-suppressed contrast-enhanced T1-weighted MR imaging were performed in 80 TMD patients with the main complaint of TMJ pain. A kappa statistical analysis was performed to calculate the interobserver agreement between two of three radiologists. The relationships between TMJ pain and various MR findings were analyzed by multiple comparison test, Spearman's rank correlation test, Chi-square test, Student's t test, and multivariate logistic regression analysis. Results Significant correlations were observed between anterior disk displacement without reduction, joint effusion, and TMJ pain (p \ 0.01). The degree of contrast enhancement of the posterior disk attachment was correlated with the severity of TMJ pain, especially spontaneous pain (r = 0.725, p \ 0.01), while no correlation was observed in the masticatory muscle pain group. The correlation tended to be higher in the latero-central portions than in the medial portion of the mandibular condyle, although no significant difference was seen. Conclusions It has been suggested that fat-suppressed contrast-enhanced MR imaging techniques facilitate better understanding of the sources of TMJ pain, but not masticatory muscle pain, and could reflect TMJ synovial inflammation. The severity of TMJ pain was closely correlated with the degree of contrast enhancement. The above-mentioned correlation had a tendency to be higher in the latero-central portions of the mandibular condyle.

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“…The coefficients for diffusion of the masseter muscles are sensitive to change by clenching—one possible cause of TMDs [120]. In the future, the relationship between the diffusion coefficients and pain symptoms in the masticatory muscles should be elucidated.…”

Section: Myositis and Muscle Edema/contracture-related Myofascial Paimentioning

confidence: 99%

The usefulness of diagnostic imaging for the assessment of pain symptoms in temporomandibular disorders

Suenaga

Nagayama

Nagasawa

et al. 2016

Japanese Dental Science Review

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SummaryThe causes of pain symptoms in the temporomandibular joint (TMJ) and masticatory muscle (MM) regions may not be determined by clinical examination alone. In this review, we document that pain symptoms of the TMJ and MM regions in patients with temporomandibular disorders (TMDs) are associated with computed tomography and magnetic resonance (MR) findings of internal derangement, joint effusion, osteoarthritis, and bone marrow edema. However, it is emphasized that these imaging findings must not be regarded as the unique and dominant factors in defining TMJ pain. High signal intensity and prominent enhancement of the posterior disk attachment on fat saturation T2-weighted imaging and dynamic MR imaging with contrast material are closely correlated with the severity of TMJ pain. Magnetic transfer contrast, MR spectroscopy, diffusion tensor imaging, and ultrasonography findings have helped identify intramuscular edema and contracture as one of the causes of MM pain and fatigue. Recently, changes in brain as detected by functional MR neuroimaging have been associated with changes in the TMJ and MM regions. The thalamus, the primary somatosensory cortex, the insula, and the anterior and mid-cinglate cortices are most frequently associated with TMD pain.

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Effect of clenching on t₂ and diffusion parameters of the masseter muscle

Abstract: The coefficients for diffusion of the MM were sensitive to change by clenching, and lambda(2) was the most sensitive. Moreover, the relative distribution of the bite forces had no effect on any of the indices.

Cited by 11 publications

References 23 publications

In vivomorphological and functional evaluation of the lateral pterygoid muscle: a diffusion tensor imaging study

In vivomorphological and functional evaluation of the lateral pterygoid muscle: a diffusion tensor imaging study

Evaluation of the relationships between contrast-enhanced magnetic resonance characteristics and joint pain in patients with temporomandibular disorders

The usefulness of diagnostic imaging for the assessment of pain symptoms in temporomandibular disorders

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Effect of clenching on t2 and diffusion parameters of the masseter muscle

Abstract: The coefficients for diffusion of the MM were sensitive to change by clenching, and lambda(2) was the most sensitive. Moreover, the relative distribution of the bite forces had no effect on any of the indices.

Cited by 11 publications

References 23 publications

In vivomorphological and functional evaluation of the lateral pterygoid muscle: a diffusion tensor imaging study

In vivomorphological and functional evaluation of the lateral pterygoid muscle: a diffusion tensor imaging study

Evaluation of the relationships between contrast-enhanced magnetic resonance characteristics and joint pain in patients with temporomandibular disorders

The usefulness of diagnostic imaging for the assessment of pain symptoms in temporomandibular disorders

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Product

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Effect of clenching on t₂ and diffusion parameters of the masseter muscle