The effect of two different occlusal concepts on the masseter muscle activity in implant retained mandibular overdentures

The reflex response of the masseter muscle to the rapid unloading of a single maxillary incisor tooth was studied. Unloading of a static force of 2 N in the horizontal direction resulted in a short-latency excitation, inhibition, and long-latency excitation of masseter muscle activity occurring at latencies of approximately 13, 20, and 40 ms, respectively, with a corresponding change in bite force occurring slightly later in each case. Following the blocking of periodontal input by the injection of local anesthetic around the stimulated tooth, inhibitory responses were abolished. Therefore, it is concluded that the observed masseteric inhibition was caused by the unloading of periodontal mechanoreceptors and thus that these receptors may contribute to the jaw unloading reflex.

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Effects of orthodontic archwire changes on masseter muscle activity

American Journal of Orthodontics ◽

10.1016/0002-9416(84)90154-4 ◽

1984 ◽

Vol 86 (4) ◽

pp. 353 ◽

Cited By ~ 1

Author(s):

B.R. Smith ◽

C.M. Flanary ◽

C.L. Hurst ◽

J.D. Rugh

Keyword(s):

Muscle Activity ◽

Masseter Muscle

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The power features of Masseter muscle activity in tension-type and migraine without aura headache during open-close clench cycles

PeerJ ◽

10.7717/peerj.3556 ◽

2017 ◽

Vol 5 ◽

pp. e3556 ◽

Cited By ~ 1

Author(s):

Behrouz Alizadeh Savareh ◽

Ali Ghanjal ◽

Azadeh Bashiri ◽

Monireh Motaqhey ◽

Boshra Hatef

Keyword(s):

Muscle Activity ◽

Masseter Muscle ◽

Migraine Without Aura ◽

Mouth Opening ◽

Tension Type Headache ◽

Emg Activity ◽

Statistical Parameters ◽

Signal Energy ◽

Type Headache ◽

Mean Variance

Introduction Different types of headaches and TMJ click influence the masseter muscle activity. The aim of this study was to assess the trend of energy level of the electromyography (EMG) activity of the masseter muscle during open-close clench cycles in migraine without aura (MOA) and tension-type headache (TTH) with or without TMJ click. Methods Twenty-five women with MOA and twenty four women with TTH participated in the study. They matched with 25 healthy subjects, in terms of class of occlusion and prevalence of temporomandibular joint (TMJ) with click. The EMG of both masseter muscles were recorded during open-close clench cycles at a rate of 80 cycles per minute for 15 seconds. The mouth opening was restricted to two centimeters by mandibular motion frame. Signal processing steps have been done on the EMG as: noise removing, smoothing, feature extraction, and statistical analyzing. The six statistical parameters of energy computed were mean, Variance, Skewness, Kurtosis, and first and second half energy over all signal energy. Results A three-way ANOVA indicated that during all the cycles, the mean of energy was more and there was a delay in showing the peak of energy in the masseter of the left side with clicked TMJ in MOA group compared to the two other groups, while this pattern occurred inversely in the side with no-clicked TMJ (P < 0.009). The variation of energy was significantly less in MOA group compared to the two other groups in the no-clicked TMJ (P < 0.003). However, the proportion of the first or second part of signal energy to all energy showed that TTH group had less energy in the first part and more energy in the second part in comparison to the two other groups (P < 0.05). Conclusion The study showed different changes in the energy distribution of masseter muscle activity during cycles in MOA and TTH. MOA, in contrast to TTH, had lateralization effect on EMG and interacted with TMJ click.

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Effects of intra‐oesophageal acid infusion and a stress task on masseter muscle activity and autonomic nervous activity in wakefulness

Journal of Oral Rehabilitation ◽

10.1111/joor.12947 ◽

2020 ◽

Vol 47 (5) ◽

pp. 567-576

Author(s):

Aya Maeda‐Iino ◽

Mika Fukushima ◽

Yoko Sakoguchi ◽

Haruhito Omure ◽

Akihito Oishi ◽

...

Keyword(s):

Muscle Activity ◽

Masseter Muscle ◽

Nervous Activity ◽

Autonomic Nervous Activity ◽

Acid Infusion ◽

Autonomic Nervous ◽

Stress Task

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Statistical Methods and Artificial Neural Networks Techniques in Electromyography

International Journal of System Dynamics Applications ◽

10.4018/ijsda.2012010103 ◽

2012 ◽

Vol 1 (1) ◽

pp. 39-47 ◽

Cited By ~ 3

Author(s):

Ahmad Taher Azar ◽

Valentina E. Balas

Keyword(s):

Neural Network ◽

Statistical Methods ◽

Muscle Activity ◽

Masseter Muscle ◽

Discrete Wavelet ◽

Neural Network Classifier ◽

Denture Base ◽

Feature Vectors ◽

Significant Difference ◽

Before And After

This work represents a comparative study for the activity of the masseter muscle for patients before trial base denture insertion and the activity of the same muscle after trial denture base insertion for both right and left masseter muscles. The study tried to find if there were significant differences in the activity of the masseter muscle before and after patients wearing their trial denture base using two approaches: parametric statistical methods and a Neural Network Classifier. Statistical analysis was performed on three feature vectors extracted from autoregressive (AR) modeling, Discrete Wavelet Transform (WT), and from Wavelet Packet Transform (WP). The least significant difference test and the student t-test have not proved significant differences in the masseter muscle activity before and after wearing denture. However, using the same feature vectors, a neural network classifier has proved that there are significant differences in the masseter muscle activity before and after patients wearing trial denture base.

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