Change of hyoid bone position in patients treated for and resolved of myofascial pain.
The purpose of this study was to investigate change in hyoid bone position for patients suffering from myofascial pain and to evaluate the modified hyoid triangle as a three-dimensional cephalometric modality for measuring hyoid position. Pre- and post-treatment CBCT scans for 30 female patients resolved of myofascial pain were reviewed by a blinded investigator using the modified hyoid triangle. Changes in dimensions of the hyoid triangle were analyzed with the t-test for paired comparisons. Statistical analysis showed a drawing nearer of the chin to the third cervical vertebra (-2.0 mm, p = 0.026) and a release of the hyoid bone away from the floor of the mouth (1.5 mm, p = 0.011). These findings suggest resolution of myofascial pain may correlate with decreased forward head posture and relaxation of suprahyoid musculature. The potential for change in oropharyngeal dimension and airway is evident.