AI Article Synopsis
- The study assessed T2 values and apparent diffusion coefficient (ADC) changes in the masseter muscle during clenching in healthy volunteers.
- A total of 37 volunteers participated, and measurements were taken before, during, and after clenching to analyze changes in muscle behavior related to bite force.
- Results indicated a significant increase in ADC values after clenching, especially in the right-to-left direction, while changes in T2 were less pronounced, suggesting that muscle contraction primarily affects ADC.
Article Abstract
Objective: The aim of this study was to evaluate the changes in T2 values and apparent diffusion coefficient (ADC) in the masseter muscle by clenching in healthy volunteers.
Methods: 37 volunteers were enrolled in the study. We measured bite force using pressure-sensitive paper and a T2 map. The ADC map was obtained at rest, during clenching, immediately after and 5 min after clenching. The spin-echo sequence was used to calculate T2, and single-shot spin-echo echo planar imaging was used to calculate the ADC. The motion-probing gradients (MPGs) were applied separately along the posterior-to-anterior (PA), right-to-left (RL) and superior-to-inferior (SI) directions, with b values of 0, 300 and 600 s mm(-2) in each direction. ADC-PA, ADC-RL, and ADC-SI values were obtained, and we calculated the ADC-iso for the mean diffusivity.
Results: There were no significant differences between the stronger and weaker sides of bite force before, during or 5 min after clenching for T2 and ADC. The bite force had little effect on these parameters; thus, we used the average of the two sides for the following analyses. Time course analysis of ADC-iso, ADC-PA, ADC-RL and ADC-SI demonstrated a marked increase after clenching and a rapid decrease immediately after clenching, although they did not completely return to the initial values; however, the change in ADC-RL was significantly greater than those in ADC-PA or ADC-SI (P<0.001 each). The changes in T2 were similar to those of ADC, although not as marked.
Conclusions: ADC (especially ADC-RL) was altered by contraction of the masseter muscle.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3611464 | PMC |
| http://dx.doi.org/10.1259/dmfr/15607259 | DOI Listing |
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