Change of hyoid bone position in patients treated for and resolved of myofascial pain.

OBJECTIVE: 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.

METHODS: 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.

RESULTS: 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).

DISCUSSION: 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.