Cone-beam computed tomographic evaluation of hyoid bone positioning in temporomandibular joint management – A pilot study

Background: Hyoid bone plays an important role in craniomandibular functions through its unique interaction with other structures. The effects of temporomandibular disorder (TMD) on the craniocervical posture and position of hyoid bone were considered, although the results endure inconclusive. Objective: The objective is the comparison of the position of the hyoid bone in patients with the temporomandibular joint disorder of pre- and post-neuromuscular orthotics utilizing cone-beam computed tomography (CBCT). Treatment using ultra-low-frequency transcutaneous electric nerve stimulation was administered, and a myocentric bite was registered, with which an orthotic was fabricated and delivered to the patient for full-time wear. Materials and Methods: The hyoid bone position of 14 TMD patients of pre- and post-treatment was observed using CBCT, and symptom severity score, joint pain, joint sounds, and limited mouth opening were studied pre- and post-treatment clinically. Results: All patients had relief of symptom severity score post treatment and no significant improvement in the anteroposterior direction of hyoid bone with no statistical significance with P value < 0.001. The majority of the patients had an inferiorly positioned hyoid bone post intervention with a P value less than 0.001. Conclusion: Neuromuscular orthotics resulted in a decrease in the symptom severity score of the patients along with an anteriorly and inferiorly positioned hyoid bone.