Temporomandibular Disorder
Conditions
Keywords
Temporomandibular joint disorder;, Surface electromyography;, Mandibular kinematics;, Sex difference;, Diagnosis.
Brief summary
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.
Detailed description
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.
Interventions
DIAGNOSTIC_TESTelectromyograph 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.
Sponsors
Stomatological Hospital Affiliated with Fujian Medical University
Study design
Observational model
COHORT
Time perspective
CROSS_SECTIONAL
Eligibility
Sex/Gender
ALL
Age
20 Years to 35 Years
Healthy volunteers
Yes
Inclusion 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; * Presence of complete permanent dentition, except third molars.
Exclusion criteria
* History of local or general trauma; * Presence of systemic diseases, neurological or psychiatric disorders, muscular diseases, cervical pain, or TMD based on the Research Diagnostic Criteria (RDC); * Pregnancy; * Consumption of anti-inflammatory, analgesic, antidepressant, or myorelaxant drugs; * Presence of parafunctional facets and anamnesis of parafunctional tooth clenching, bruxism, or unilateral chewing; * Presence of obvious dentition crowding or spacing, malposed, supernumerary or fractured tooth, visible caries, tooth abrasion/hypersensitivity, toothache, periodontal disease, or occlusal discomfort; * Fixed or removable restorations, tooth filling, or occlusal adjustment that affected the occlusal surfaces; * Previous or concurrent orthodontic, orthognathic, or TMJ treatment.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Surface electromyography (μV) | 3 days | 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. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Mandibular kinematics (mm, mm/s) | 3 days | Kinesiographic recordings were performed using a kinesiograph, the maximum mouth Maximal opening, maximal and average opening and closing velocities were measured. |
Countries
China
Outcome results
None listed