Mastication Disorder, Temporomandibular Joint Disorders
Conditions
Keywords
occlusion, pain
Brief summary
The cause of temporomandibular joint disorders remains unknown. It is considered multifactorial and includes physical (peripheral) and psychosocial (central) factors. It has been showed an association: a steeper condylar path, flatter lateral anterior guidance, and habitual chewing on the symptomatic side. This finding argues the possibility of causation of some of these characteristics. This double blind longitudinal study aims to assess if the presence of one habitual chewing side could contribute to temporomandibular joint disorders over time. Method. Young adults with no signs or symptoms of TMD will be assessed. Participants with one chewing side (observed and interview); with steeper condylar path and lower lateral guidance angles will be considered consistent one side chewers, and this side will be considered more susceptible to suffer TMD. Mouth opening, hemispheric dominance and hemimandibular retrognathia will be considered as secondary pre-specified outcomes. Four years later, both TMJs of each participant presenting signs and/or symptoms will be evaluated according to DC/TMD.
Interventions
OTHERDiagnostic
OBSERVATIONAL, DIAGNOSTIC PROCEDURES. Young adults with no signs or symptoms of TMD will be assessed. The chewing function, condylar path angles and lateral guidance angles will be recorded. Maximum comfortable and unassisted jaw opening, hemispheric dominance and hemimandibular retrognathia will be considered as secondary pre-specified outcomes. Three-Four years later, both TMJs of each participant presenting signs and/or symptoms will be evaluated according to DC/TMD. Same recordings as baseline will be carried out.
Sponsors
University of Santiago de Compostela
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to 30 Years
Healthy volunteers
Yes
Inclusion criteria
* healthies * full dentates * normal occlusion * One habitual chewing side
Exclusion criteria
* Severe malocclusion, dental decay, severe periodontal disease. Pains from other origins or Orthodontics are not criteria for exclusion
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change of maximal unassited jaw opening | Baseline and 3 years follow-up | Maximum unassisted jaw opening or interincisal distance (from edge to edge) measured by a Boley gauge. Up 38 in females and up 40 mm in males are considered limited. |
| Presence or not of symptoms of temporomandibular joint disorders according to DC/TMD | At 3 years follow-up | Pain-intensity (0-10 VAS scale, Von Korf) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Alteration of lateral dental guidance angles | Baseline and 4-years follow-up (end of the study) | Angle between Frankfort plane and lateral dental anterior guidance |
| Change of maximal comfortable jaw opening | Baseline and 4-years follow-up (end of the study) | Maximum jaw opening or interincisal distance (from edge to edge) measured by a Boley gauge. Up 38 in females and up 40 mm in males are considered limited. |
| Change of condylar paths angles inclination | Baseline and 3-4-years follow-up (end of the study) | Alteration of parasagittal plane Axiography of condyle motion in respect Frankfort horizontal plane |
| Change of the habitual chewing side | Baseline and 3-4-years follow-up (end of the study) | Determining the habitual chewing side by direct observation using chewing gum, First cicle, and subsequent cicles (7 or over of 10 cicles), interview (used one habitual chewing side?: 1, no, alternate; 2, yes, right; 3, yes, left; 4, I don't know) and kinesiography. |
| Change of lateral deviation during maximal unassisted jaw opening | Baseline, 3 years follow-up | Kiesiography K7 |
Other
| Measure | Time frame | Description |
|---|---|---|
| Hemispheric dominance, asuming oposite side to handedness preference | Baseline | Edinburg inventory (Oldfield) |
| Hemimandibular retrognathia | Baseline | Interincisal median midline and Angle Class on each side |
| Change of Life quality | Baseline, 3 years follow-up | SCL-90-R self-administered questionaire |
Countries
Spain
Outcome results
None listed