The objective of this study is to perform an evaluation of the effect of LLLT on the prevention of fatigue in the masseter and anterior temporal muscles in young individuals with and without TMD.
Male and female individuals aged 18 to 23 years will be evaluated. The Research Diagnostic Criteria for Temporomandibular Disorders will be applied for the determination of the presence or absence of temporomandibular disorder. Each group (with and without temporomandibular disorder) will then be randomly allocated into a control group and experimental group submitted to pre-fatigue low-level laser therapy. Before and after the induction of fatigue, all volunteers will be evaluated with regard to the range of mandibular movement, bite force, sensitivity to palpation of the muscles evaluated and muscle fatigue. Low-level laser therapy will be administered to the masseter and anterior temporal muscles prior to the induction of fatigue, which will be induced with the use of chewing gum. The data will be submitted to descriptive statistical analysis. The chi-square test and Fisher's exact test will be used to establish the associations of the categorical variables. Pearson correlation coefficients will be calculated for the analysis of the correlation of the continuous variables.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
SINGLE
Enrollment
90
Three points will be irradiated over the masseter muscle (upper, middle and lower bundles) and one point will be irradiated over the anterior temporal muscle of each side of the face in the groups submitted to pre-fatigue laser. The following parameters will be employed: wavelength: 780 nm; energy density: 25 J/cm2; output power: 50 mW; power density: 1.25 W/cm2; and exposure time: 20 seconds per points, resulting in a total energy of 1 J per point. The laser will be applied punctually with a conventional tip in contact with the skin considering an area of 0.04 cm2.
The same equipment will be used in the placebo group, but with a pen that emits a red guide light and a warning sound, but without the emission of a laser beam.
Universidade Nove de Julho
São Paulo, São Paulo, Brazil
RECRUITINGChange on Bite Force
A digital dynamometer will be used for the determination of bite force. The measurements will be taken in the region of the 1st molars.
Time frame: 6 minutes
Change on range of mandibular movements
The individuals will be instructed to open their mouths as wide as possible and maximum active vertical mandibular movement (distance between maxillary and mandibular central incisors) will be recorded with the aid of digital calipers. The individuals will then be instructed to repeat the motion with pressure applied to the maxillary and mandibular teeth to obtain maximum passive vertical mandibular movement with the aid of the calipers. These measurements will be made before and after LLLT.
Time frame: 6 minutes
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.