Coronal fat-suppressed T2-weighted MR image. In order to locate the same plane every week, the axial (pulp floor of molar teeth), sagittal (midline of face), and coronal (first molar including two roots) planes were adjusted. The location of the region of interest (ROI) was used to measure the signal intensity in the mandibular first molar area. The ROIs included the alveolar bone marrow between the first molar and the incisor, and the adjacent muscles.