An observational study in Temporomandibular Disorder, sponsored by Stomatological Hospital Affiliated with Fujian Medical University. Completed at 1 site in China. Open to participants aged 20 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2024-04-18.
Sponsored by Stomatological Hospital Affiliated with Fujian Medical University · Observational
This study aimed to provide normal reference values of surface electromyography (sEMG) and mandibular kinematics in Chinese young adults, compare the sex differences and assess the diagnosis value of these indices.
Temporomandibular disorders (TMD) are one of the leading causes of craniofacial pain, and a high incidence of TMD in young adults has been reported. Previous studies have used sEMG and mandibular kinematic analysis to diagnose TMD. This was an observational study that healthy young adults with individual normal occlusion were strictly selected by diagnosis standard, and TMD patients with disc displacement were recruited. The sEMG signals of the anterior temporalis (TA), masseter (MM), and sternocleidomastoid and digastric were recorded in the mandibular postural positions (MPP) and during maximal voluntary clenching (MVC) with K7 electromyograph. Mandibular kinematics, including maximum opening and opening/closing velocities, were assessed by K7 kinesiograph.
609 studies on the registry are indexed under Temporomandibular Joint Disorders; 160 are open to participants now.
This study's enrollment of 120 is above the median of 90 across 165 observational studies indexed under Temporomandibular Joint Disorders.
Browse Temporomandibular Joint Disorders studies →Stomatological Hospital Affiliated with Fujian Medical University is the lead sponsor of 4 studies on the registry; 3 are open to participants now.
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Healthy volunteers were recruited from college students of Fujian Medical University, while the temporomandibular disorder participants were recruited through public invitations, via recruitment posters and personal contacts.
Exclusion Criteria:
Healthy subjects who fulfilled the following criteria: centred midline and no marked restriction and deviation of mouth opening and closing; overjet and overbite of 1-3 mm, bilateral molar support with molar and cusp relation of Angle's class I, and presence of complete permanent dentition, except third molars.
Diagnostic Test: electromyograph and kinesiograph
Patients with unilateral or bilateral temporomandibular joint (TMJ) disc displacement symptoms, such as TMJ clicking, TMJ locking, and limitation in opening mouth were included in the study. The study did not cover the patients with muscle disorders (myofascial pain), with arthralgia, osteoarthritis, and osteoarthrosis, with TMJ fracture, with dentofacial deformity, with systemic disease affecting TMJ, and undergone TMD treatments.
Diagnostic Test: electromyograph and kinesiograph
The sEMG of the anterior temporalis (TA), masseter (MM), sternocleidomastoid (cervical group, CG), and digastric (DA) were recorded simultaneously with an sEMG device (K7/EMG, USA) using disposable silver/silver chloride bipolar surface electrodes. First, sEMG was conducted on four pairs of muscles (TA, MM, CG, and DA) in the MPP, and subjects were guided to maintain the face and jaw as relaxed as possible. To determine the relative efficiency of muscle function, the second test was performed to measure the sEMG of TA and MM during the maximal biting force against natural dentition. In the third test, subjects were guided to clench three times to monitor early motor unit recruitment as they closed from rest through freeway space to initial tooth contact. Kinesiographic recordings were performed using a kinesiograph (K7/Computerized Mandibular Scanning (CMS), USA) that measured the maximum mouth opening (MMO) and opening and closing velocities.
Surface electromyography (μV)
The sEMG of the anterior temporalis (TA), masseter (MM), sternocleidomastoid (cervical group, CG), and digastric (DA) during mandibular postural position and maximal clench were recorded.
Time frame: 3 days
Mandibular kinematics (mm, mm/s)
Kinesiographic recordings were performed using a kinesiograph, the maximum mouth Maximal opening, maximal and average opening and closing velocities were measured.
Time frame: 3 days
Plan to share: Undecided
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This study is completed, as verified in Apr 2024. You cannot join it, but the record below documents what was studied.
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Temporomandibular Joint Disorders→
Stomatological Hospital Affiliated with Fujian Medical University