The chronicity of myogenous temporomandibular disorder changes the skin temperature over the anterior temporalis muscle

Healthy subjects have a prevalent side on which they display higher-muscle activity during clenching. The relationship between symmetry of masseter muscle (MM) and anterior temporalis (TA) muscle activities and occlusion has been evaluated on the basis of physiological parameters. The aim of the present study was to investigate whether the symmetry of surface EMG (sEMG) activity in asymptomatic young adults is related to symmetry of occlusal contacts.Material. The study population consisted of seventy-two 18-year-old subjects with no temporomandibular disorder (TMD) symptoms.Method. All the participants underwent an sEMG recording with an 8-channel electromyograph (BioEMG III). A T-Scan III evolution 7.01 device was used to analyze the occlusal contact points.Results. The correlation between the activity of right (R) and left (L) TA and the percentage of occlusal contacts was assessed, but no significant differences were found between the RMM and LMM muscles. The differences in the medium values of sEMG between males and females were not statistically significant. Equilibrated muscular activity between RTA and LTA occurred when occlusal contacts reached the percentage of 65% on the left side.Conclusion. The symmetry of sEMG activity in asymptomatic young adults is not related to symmetry of occlusal contacts.

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Postural and dynamic masseter and anterior temporalis muscle EMG repeatability in serial assessments

Journal of Oral Rehabilitation ◽

10.1111/j.1365-2842.2009.01999.x ◽

2009 ◽

Vol 36 (11) ◽

pp. 814-820 ◽

Cited By ~ 26

Author(s):

T. I. SUVINEN ◽

J. MALMBERG ◽

C. FORSTER ◽

P. KEMPPAINEN

Keyword(s):

Temporalis Muscle ◽

Serial Assessments ◽

Anterior Temporalis

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Reliability and Validity of a Pressure Threshold Meter in Recording Tenderness in the Masseter Muscle and the Anterior Temporalis Muscle

CRANIO® ◽

10.1080/08869634.1989.11678288 ◽

1989 ◽

Vol 7 (3) ◽

pp. 223-229 ◽

Cited By ~ 24

Author(s):

Thomas List ◽

Martti Helkimo ◽

Gunnar Falk

Keyword(s):

Masseter Muscle ◽

Reliability And Validity ◽

Temporalis Muscle ◽

Pressure Threshold ◽

Anterior Temporalis

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Time-course of analgesic effects of botulinum neurotoxin type A (BoNTA) on human experimental model of pain induced by injection of glutamate into temporalis muscle

Scandinavian Journal of Pain ◽

10.1016/j.sjpain.2012.05.037 ◽

2012 ◽

Vol 3 (3) ◽

pp. 187-187

Author(s):

L. Bittencourt da Silva ◽

D. Kulas ◽

A. Karshenas ◽

B.E. Cairns ◽

F.W. Bach ◽

...

Keyword(s):

Pain Intensity ◽

Skin Temperature ◽

Animal Studies ◽

Time Course ◽

Pressure Pain Threshold ◽

Tissue Perfusion ◽

Temporalis Muscle ◽

Doppler Flowmetry ◽

Analgesic Effects ◽

Left And Right

Abstract Background/aims Analgesic effects of BoNTA develop within few hours in animal studies and within days in human studies. We have previously shown that BoNTA can block glutamate-induced mechanical sensitization and neurogenic vasodilation in rat temporalis muscle within 3 h. The present translational study was designed to explore the time-course of analgesic effects of BoNTA on pain, sensitization and vasomotor responses in a glutamateevoked human pain model. Methods BoNTA (5U) and saline were injected (30 min interval) into the left and right temporalis muscles of 12 healthy males (24.2° 2 years). Pressure pain threshold (PPT), skin temperature (thermo camera) and tissue perfusion (laser Doppler flowmetry) were measured every hour for 3 h. Afterwards, subjects received an intramuscular injection of glutamate (1M– 0.2 mL) into the left and right temporalis muscles. Pain intensity (VAS) was recorded for 10 min after injection and pain distribution was then mapped. PPT was measured at 15 and 30 min following the glutamate injections, while skin temperature and tissue perfusion were recorded at 5, 15 and 30 min. Results This preliminary data showed that BoNTA significantly reduced glutamate-evoked peak pain intensity compared with saline (P = 0.042). Expansion of pain area was also smaller in the muscles pretreated with BoNTA (P = 0.045). Glutamate-induced vasomotor reactions (elevated skin temperature and tissue perfusion) showed a tendency to decline in BoNTA-pretreated muscles. A similar pattern was seen in terms ofmuscle sensitivity with higher PPT values in BoNTA-pretreated muscles. Conclusions BoNTA induced a direct analgesic effect withi 3 h of its injection into the temporalis muscle. This phenomenon, at least in part, might be through BoNTA actions on nociceptors. Present data also indicated that BoNTA attenuated glutamateinduced muscle sensitization and vasomotor reactions. This finding may suggest additional effects of BoNTA on the pattern of release of substances which are involved in pain pathways.

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