Cortical control of mastication in cats. 2. Deficits of masticatory movements following a lesion in the motor cortex

Hiraba, Hisao; Sato, Takako

doi:10.1080/08990220500262307

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…In first step data analysis for each participant, we observed an activation pattern in the sensorimotor cortex and primary motor area similar to animal and human studies of the tooth clenching block (18)(19)(20)(21).…”

Section: Discussionsupporting

confidence: 55%

Cerebral Representation of Splint Therapy in Bruxism Patients; An fMRI Experiment

Yılmaz¹,

Mısırlıoğlu²

2019

Akd Med J

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Objective: The aim of this study was to investigate the effects of the novel Nociceptive Trigeminal Inhibition Tension Suppression System (NTI-tss) splint therapy in bruxism patients based on the view that the etiology is derived from central nerveous system. It was also aimed to evaluate the differences in cortical activity between bruxism patients and healthy subjects during the clenching function. Material and Methods: A total of 30 volunteers (15 bruxist and 15 healthy) attending the KırıkkaleUniversity Faculty of Dentistry for various dental reasons were included in the study. For the diagnosis of bruxism, the criteria determined by an international consensus in 2013 were used. Brain activity was examined by functional magnetic resonance imaging during tooth clenching and rest tasks for each participant with the BrainVoyager QX 2.8 statistical data analysis program. This protocol was approved by the ethics committee of the medical faculty of Kırıkkale University, Turkey (02/04). Results: When the average rate of brain activity in healthy subjects and bruxism patients was compared, hypoactivation was observed during the clenching task in the inferior parietal lobe (Brodmann 39 ve 40) and dorsal posterior cingulate area (Brodmann 31). The group analysis between pre-and post-treatment groups revealed one activation cluster in the post-treatment group that may indicate increased activation in the mentioned cortical areas after 11 nights of NTI-tss splint therapy. When control group compared with post-treatment group no differences observed. Conclusion: With the aid of a neuroimaging technique, the decrease in activation in certain areas of the cerebral cortex in patients with bruxism. Our findings indicate that wearing the NTI-tss splint for 11 nights increased BOLD in the mentioned cortical area. These results might improve the understanding and physiological handling of sleep bruxism.

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Section: Discussionsupporting

confidence: 55%

Cerebral Representation of Splint Therapy in Bruxism Patients; An fMRI Experiment

Yılmaz¹,

Mısırlıoğlu²

2019

Akd Med J

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“…20 In first-step data analysis for each participant, we calculated BOLD signal changes between clenching and rest blocks and observed activation pattern in the cortical mastication area as described in previous studies (Figures 2 and 4). [21][22][23][24] Byrd et al 14 compared self-reporting patients with bruxism and the control group using fMRI. They found hypoactivation in the motor cortex (supplementary motor area, sensorymotor area and rolandic operculum) and the subcortical (caudate) areas in patients with bruxism in parafunctional movements.…”

Section: Discussionmentioning

confidence: 99%

To see bruxism: a functional MRI study

Yılmaz

2015

Dentomaxillofacial Radiology

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Objective: Since the pathophysiology of bruxism is not clearly understood, there exists no possible treatment. The aim of this study is to investigate the cerebral activation differences between healthy subjects and patients with bruxism on behalf of possible aetiological factors. Methods: 12 healthy subjects and 12 patients with bruxism, a total of 24 right-handed female subjects (aged 20-27 years) were examined using functional MRI during tooth-clenching and resting tasks. Imaging was performed with 3.0-T MRI scanner with a 32-channel head coil. Differences in regional brain activity between patients with bruxism and healthy subjects (control group) were observed with BrainVoyager QX 2.8 (Brain Innovation, Maastricht, Netherlands) statistical data analysis program. Activation maps were created using the general linear model: single study and multistudy multisubject for statistical group analysis. This protocol was approved by the ethics committee of medical faculty of Kirikkale University, Turkey (02/04), based on the guidelines set forth in the Declaration of Helsinki. Results: The group analysis revealed a statistically significant increase in blood oxygenation level-dependent signal of three clusters in the control group (p , 0.005), which may indicate brain regions related with somatognosis, repetitive passive motion, proprioception and tactile perception. These areas coincide with Brodmann areas 7, 31, 39 and 40. It is conceivable that there are differences between healthy subjects and patients with bruxism. Conclusions: Our findings indicate that there was a decrease of cortical activation pattern in patients with bruxism in clenching tasks. This indicates decreased blood flow and activation in regional neuronal activity. Bruxism, as an oral motor disorder concerns dentistry, neurology and psychiatry. These results might improve the understanding and physiological handling of sleep bruxism.

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“…Detailed descriptions of most of the methods have already been published (Hiraba et al 1997(Hiraba et al , 2000Hiraba 2004;Hiraba and Sato 2004, 2005b, 2005c and so the following descriptions focus on new methodological approaches.…”

Section: Methodsmentioning

confidence: 99%

Organization of cortical processing for facial movements during licking in cats

Hiraba¹,

Sato

Saito³

et al. 2007

Somatosensory & Motor Research

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We proposed that cortical organization for the execution of adequate licking in cats was processed under the control of two kinds of affiliated groups for face and jaw & tongue movements (Hiraba H, Sato T. 2005A. Cerebral control of face, jaw, and tongue movements in awake cats: Changes in regional cerebral blood flow during lateral feeding Somatosens Mot Res 22:307-317). We assumed the cortical organization for face movements from changes in MRN (mastication-related neuron) activities recorded at area M (motor cortex) and orofacial behaviors after the lesion in the facial SI (facial region in the primary somatosensory cortex). Although we showed the relationship between facial SI (area 3b) and area M (area 4delta), the property of area C (area 3a) was not fully described. The aim of this present study is to investigate the functional role of area C (the anterior part of the coronal sulcus) that transfers somatosensory information in facial SI to area M, as shown in a previous paper (Hiraba H. 2004. The function of sensory information from the first somatosensory cortex for facial movements during ingestion in cats Somatosens Mot Res 21:87-97). We examined the properties of MRNs in area C and changes in orofacial behaviors after the area C or area M lesion. MRNs in area C had in common RFs in the lingual, perioral, and mandibular parts, and activity patterns of MRNs showed both post- and pre-movement types. Furthermore, cats with the area C lesion showed similar disorders to cats with the area M lesion, such as the dropping of food from the contralateral mouth, prolongation of the period of ingestion and mastication, and so on. From these results, we believe firmly the organization of unilateral cortical processing in facial SI, area C, and area M for face movements during licking.

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Cortical control of mastication in cats. 2. Deficits of masticatory movements following a lesion in the motor cortex

Cited by 7 publications

References 35 publications

Cerebral Representation of Splint Therapy in Bruxism Patients; An fMRI Experiment

Cerebral Representation of Splint Therapy in Bruxism Patients; An fMRI Experiment

To see bruxism: a functional MRI study

Organization of cortical processing for facial movements during licking in cats

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