Difference between revisions of "Bilateral Trigeminal neuromotor organic symmetry"

According to this stability, the R-MEPs may be considered as a normalization organic factor. In this work we studied the muscular evoked potentials on the masseters muscles after the direct bilateral stimulation of the motor roots of the trigeminal motor system called bilateral Root Motor Evoked Potentials (_bR-MEPs) by transcranial in the electrical stimulation. The <math>_mANEE</math>, symmetry and synchrony properties of the resulting _bR-MEPs were studied using measures like latency, amplitude and integrated area of the signal. This technique could allow us, from the neurphysiopathological point of view, a better assessment of masticatory function and to verify the possibility to consider the _bR- MEPs as a normalization landmark. This technique will implement the already widely used electrophysiological standardized methods, like conventional EMG techniques (''I''_EMG or RMS_EMG) and unconventional trigeminal reflexes.

Twenty-five people including 15 males (mean age 30 ± 5 years) and 10 females (mean age 27 ± 4 years) with normal occlusion and no history of OP and TMDs underwent to _bR-MEPs of the trigeminal motor system. As exclusion criteria we used to include only those subjects that are not entered in the classification RDC/TMD. The RDC/ TMD is a biaxial diagnostic tool composed of a clinical exam based on a detailed physical evaluation of the mouth opening pattern, vertical extension of mandibular movement, noises in the TMJ upon palpation during vertical movement, excursive mandibular movements and noises in the Temporomandibular Joint (TMJ) upon palpation during lateral excursion and protrusion. The RDC/TMD questionnaire is made up of 31 items addressing general health, oral health, history of facial pain, mouth opening limitation, joint noises, habits, bite, ringing in the ears, health conditions in general, joint problems, headache, current behaviour and social and economic profile.<ref>Dworkin SF, LeResche L (1992) Research diagnostic criteria for temporomandibular disorders: review, criteria, examinations and specifications, critique. J Craniomandib Disord 6: 301-355.</ref>

Where, <math>CC_{i,e}</math> is the ''i''th estimated value, <math>CC_{i,t}</math> is the ''<math>i^{th}</math>'' true value, and ''<math>\bar{CC}_{e}</math>'' is the mean of the estimated values.<br />

==Results==

The table 1 show the list of row EMG value which were subsequently normalized and weighed in order to train – as input – the ANN. In Table 2 we report the descriptive and comparative statistical results. With regard to the descriptive statistical aspect we can consider the mean and SD values for onset latency (1.96 msec ± 0.18 msec vs. 2.01 msec ± 0.21 msec), amplitude (5.76 mV ± 2.01 mV vs''.'' 5.89 mV ± 2.51 mV) and integral area (11.09 mV/msec ± 4.45 mV/msec vs''.'' 11.27 mV/msec ± 4.34 mV/msec) for right and left masseter, respectively.[[File:Symmetry 2.jpg|thumb|'''Table 2:''' In the table are reported statistically descriptive data and ''p''-values between sides for onset latency, amplitude and integral area of the bR-MEPs.