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Trabalhos publicados e em desenvolvimento
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Masticatory muscle activity during maximum voluntary clench in
different research diagnostic criteria for temporomandibular
disorders (RDC/TMD) groups |
Autores:
Gianluca M. Tartaglia, Marco Antonio Moreira Rodrigues da Silva,
Stefano Bottini, Chiarella Sforza, Virgilio F. Ferrario
Abstract:
The research diagnostic criteria for temporomandibular disorders (RDC/TMD)
are used for the classification of patients with temporomandibular
disorders (TMD). Surface electromyography of the right and left
masseter and temporalis muscles was performed during maximum teeth
clenching in 103 TMD patients subdivided according to the RDC/TMD
into 3 non-overlapping groups: (a) 25 myogenous; (b) 61
arthrogenous; and (c) 17 psycogenous patients. Thirty-two control
subjects matched for sex and age were also measured. During
clenching, standardized total muscle activities (electromyographic
potentials over time) significantly differed: 131.7 mV/mVs % in
the normal subjects, 117.6 mV/mVs % in the myogenous patients,
105.3 mV/mVs % in the arthrogenous patients, 88.7 mV/mVs % in the
psycogenous patients (po0.001, analysis of covariance). Symmetry
in the temporalis muscles was larger in normal subjects (86.3%)
and in myogenous patients (84.9%) than in arthrogenous (82.7%),
and psycogenous patients (80.5%) (p ¼ 0.041). No differences were
found for masseter muscle symmetry and torque coefficient
(p40.05). Surface electromyography of the masticatory muscles
allowed an objective discrimination among different RDC/TMD
subgroups. This evaluation could assist conventional clinical
assessments.
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Asymmetry index
of masticatory muscle as a parameter for analysis of the TMD
treatment outcomes |
Autores:
Cláudia Maria de Felício, Melissa de Oliveira Melchior, Cláudia
Lúcia Pimenta Ferreira, Marco Antonio Moreira Rodrigues da Silva
Introduction: The therapy most frequently employed for the
treatment of Temporomandibular disorder (TMD) is the occlusion
splint (OS). Orofacial exercises have also been applied, with work
directed at stomatognathic functions, i.e., orofacial
myofunctional therapy (OMT), being included in certain approaches.
The literature indicates that evidence is weak and further studies
are needed (Michelotti et al, 2005). Analysis of the asymmetry of
muscle pairs on the right and on the left by surface
electromyography (EMG) has been performed in order to identify the
effects of the use of the OS, but we did not detect any studies
using it in order to analyze the effects of the OMT. The objective
of the study was to assess the TMD treatment outcomes based on the
asymmetry index (AI) of the mandible elevating muscles.
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Neuromuscular
evaluation by means of electromyographic parameters |
Autores:
Rodrigues da Silva, M.A., Felício, C.M.; Vieira e Silva, C.A.;
Melchior, M.O.; Rodrigues da Silva, A.M.B.
Introduction: Experimental studies,
conducted using electromyography (EMG) on masticatory muscles have
produced favorable results. This has endorsed the use of EMG in
clinical settings, as well as the use of routine as an instrument
for the preliminary diagnosis of craniomandibular pathologies9,
and in managing patient therapy and follow-up 2;6;7. Ferrario and
colleagues6 proposed and developed the POC (percentage
overlapping coefficent; %), a parameter indicative of the
symmetric distribution of muscle activity6. Calculating the
torsion index (TORS, %) makes it possible to identify the presence
of a force with a potential lateral displacement component.3
Similarly to the POC, the asymmetry index (ASIM, %) evaluates
muscle contraction symmetry or asymmetry.
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An electromyographic evaluation of muscle simmetry in
normo-occlusion subjects |
Autores:
André Luís Botelho, Ana Maria Bettoni
Rodrigues da Silva e Marco Antonio Moreira Rodrigues da Silva
Introduction: Assessments of
morphological symmetry craniofacial have become a part of the
usual characterization of both healthy subjects and in patients (Ferrario
et al., 1994). The evaluation of functional symmetry of the
complex craniofacial usually involves the patterns of movements in
the jaw and the activities of the masticatory muscles (Naeije,
McCarroll & Weijs, 1989; Ferrario, Sforza & Serrão, 2000).
Patterns of contraction of pairs of muscles can be investigated
using surface electromyography (EMG), which enables the monitoring
of some of the major masticatory muscles (masseter and temporalis).
The aim of this study was to analyze the possible existence of
asymmetries between the muscles masseters and temporalis anterior
on both sides in subjects with normal occlusion and relate the EMG
findings of asymmetry with data from the clinical evaluation of
the stomatognathic system.
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Applications of
protocol of TMD treatment with occlusal splint and
electromyographic evaluation |
Autores:
Marco Antonio Moreira Rodrigues da Silva, Caroline Vieira e Silva,
André Luís Botelho, Cláudia Maria de Felício e Ana Maria Bettoni
Rodrigues da Silva
Introdução:
Surface electromyography (EMG) can currently be considered a
very useful instrument which allows a quantitative assessment of
masticatory muscles in patients with temporomandibular dysfunction
(TMD) (FERRARIO et al. 2000). The purposes of this study were: to
correlate the clinical assessment data before and after the
treatment with an occlusal splint for a group patients with TMD,
classified according to the RDC / TMD; to compare the results
obtained with EMG, before and after treatment with an occlusal
splint; to compare the EMG results for this group suffering from
TMD and an asymptomatic control group.
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