Functional Analysis of Rhythmic Jaw Movements Evoked by Electrical Stimulation of the Cortical Masticatory Area During Low Occlusal Loading in Growing Rats

Aung, Phyo Thura; Kato, Chiho; Abe, Yukichi; Ogawa, Takuya; Ishidori, Hideyuki; Fujita, Akiyo; Okihara, Hidemasa; Kokai, Satoshi; Ono, Takashi

doi:10.3389/fphys.2020.00034

Cited by 10 publications

(23 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peak-to-peak amplitude was significantly reduced in the experimental group after soft diet feeding, as in our previous study 19 . Animals feeding with soft diet showed a significant decrease in the cross-sectional area of the type 2 fibers of the jaw-opening muscle 35 , 44 .…”

Section: Discussionsupporting

confidence: 88%

“…The delayed onset latency was observed during soft diet feeding, which alters the oxidative capacity of jaw muscle fibers given less muscle usage, which results in immature peripheral sensory feedback 41 – 43 . The prolongation of the onset latency was supported by our previous study in which we found that the jaw muscle was evoked by stimulation of the P-CMA 19 , and this study also suggests that low occlusal loading not only affects the peripheral system but also alters the central response that is specifically elicited by stimulation of the A-CMA.…”

Section: Discussionsupporting

confidence: 81%

“…We also found that for the A-CMA, the maximum gape size of jaw movement behavior appeared at a current strength of 120 µA. In contrast, in our previous study 19 , the P-CMA induced the maximum gape size of jaw movement at a current strength of 180 µA. While the characteristics of jaw movement elicited by stimulation of the A-CMA and P-CMA did not differ between the studies, the amplitude of the maximum gape size and the lateral excursion varied depending on the stimulation site.…”

Section: Discussioncontrasting

confidence: 64%

“…A midline incision was made along the neck from the mandible on the ventral surface to the rostral portion to expose the right side of masseter (jaw-closer) and anterior digastric (jaw-opener) muscles to record EMG activity from the jaw muscles 19 , 22 , 23 . Bipolar EMG electrodes (40 gauge, single-stranded, Teflon insulated stainless-steel wires, 2 mm inter-electrode distance) were then inserted into the muscles to record EMG activity 19 , 22 , 23 . A part of the left frontal and parietal bones were drilled using a dental bar to expose the outer surface of the masticatory cortex to stimulate the cerebral cortex, and the dura mater was covered with paraffin liquid oil (37 °C).…”

Section: Methodsmentioning

confidence: 99%

“…The observed differences in masticatory behavior may reflect the different projection pathways of these two areas. We have previously shown that an altered occlusal behavior by long-term feeding of soft diet affects the neuromuscular control of the jaw muscles induced by the P-CMA 19 . Anterograde tract-tracing studies of the CMA showed that the cortical projection from the A-CMA is denser in the inter-trigeminal region and reticular and is located ventrally to the trigeminal motor nucleus when compared to the projection from the P-CMA 16 , 20 .…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effects of low occlusal loading on the neuromuscular behavioral development of cortically-elicited jaw movements in growing rats

Aung

Kato

Fujita

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

The effect of altered occlusal force on masticatory-related neuromuscular control, which projects from the anterior part of the cortical masticatory area (A-CMA), during growth remains unclear. This study sought to evaluate the effect of occlusal hypofunction on neuromuscular development of jaw muscle activities and cortically-induced rhythmic jaw movements (RJMs) in growing rats. Sixty-four 2-week-old male albino Wistar rats were divided into the control (fed normal diet) and experimental (fed soft diet) groups soon after weaning. Electromyographic activity was recorded at 5, 7, 9, and 11 weeks from the right masseter and anterior digastric along with RJMs. We found a significantly longer onset latency and smaller peak-to-peak amplitude in the experimental group than that in the control group. The RJMs showed an increase in gape size and lateral excursion until up to 9 weeks in both groups. However, both the average gape size and lateral excursion were significantly smaller in the experimental group than that in the control group after 9 weeks. The jaw movement pattern also showed a significant decrease at the maximum opening period in the experimental group. Our findings indicate that inadequate occlusal function during growth alters neuromuscular control of masticatory behaviors and impairs the pattern of RJMs.

show abstract

Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 81%

Section: Discussioncontrasting

confidence: 64%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of low occlusal loading on the neuromuscular behavioral development of cortically-elicited jaw movements in growing rats

Aung

Kato

Fujita

et al. 2021

Sci Rep

Self Cite

View full text Add to dashboard Cite

show abstract

Brain Mechanisms of Oral Motor Functions

2021

Dental Neuroimaging

View full text Add to dashboard Cite

Evaluation of occlusal bite force distribution by T-Scan in orthodontic patients with different occlusal characteristics: a cross sectional-observational study

Abutayyem,

M Annamma,

Desai

et al. 2023

BMC Oral Health

View full text Add to dashboard Cite

Background The aim of orthodontic treatment, apart from esthetic and functional corrections, is uniform force distribution. Hence Occlusal analysis using a T scan gives scope for a precisely targeted treatment plan. The T-scan evaluation of occlusal force, time, and location of contacts from initial occlusal contact to maximum intercuspation enables the orthodontist to sequentially balance the occlusal forces on the right and left sides through specific treatment plan options. Objective The current study aimed to determine the force distribution in the different individuals by using a T-Scan as well as the net discrepancies of forces generated at a maximum intercuspation position in the first molar region between the left and right sides of the mouth. Methods This is a descriptive-correlational study that was carried out in Ras Al Khaimah College of Dental Sciences clinics and Ajman University clinics from January 2020 to September 2022 by using the convenience sampling technique. The T-scan III Novus was employed in this investigation to record multi-bite scans for several patients. T-scan was utilised to examine various malocclusions. Results The present study consisted of 158 participants. Analysis of Variance (ANOVA) showed that there is a statistically significant difference in the percentage of force between the three types of malocclusions (I, II, and III) on the right molar side (B-16 and B-46) (p < 0.05). Moreover, the overall discrepancy showed a statistically significant difference in the three types of malocclusion classifications (p < 0.05). On the other hand, there was no statistically significant difference in the percentage of force between B-26 and B-36 (p > 0.05). Post hoc analysis showed a statistically significant difference in the percentage of force between malocclusion classes I and III on the right molar, with a mean difference of 4.11190 (p < 0.05). Similarly, there was a statistically significant difference in B-46 between Malocclusion Classes I and II, 4.01806 (p < 0.05). Additionally, post hoc analysis showed a statistically significant difference between malocclusion classes I and III, with a mean difference of -4.79841 (p < 0.05) on the right molar. Conclusion The T-Scan is a useful tool for assessing occlusal discrepancies and can be helpful during treatment planning and follow-up, especially for orthognathic surgery patients. A T-scan could be used in orthodontic therapy in a simple and efficient way. Also, it turned out to be a useful tool for diagnosing problems and gave us new information about how therapies work. In this study, T-Scan showed that it can measure occlusal forces in timing in an objective, accurate, and repeated manner. The current study found that T-Scan was better able to report the difference in the percentage of force on the right molar side than on the left side.

show abstract

Functional Analysis of Rhythmic Jaw Movements Evoked by Electrical Stimulation of the Cortical Masticatory Area During Low Occlusal Loading in Growing Rats

Cited by 10 publications

References 80 publications

Effects of low occlusal loading on the neuromuscular behavioral development of cortically-elicited jaw movements in growing rats

Effects of low occlusal loading on the neuromuscular behavioral development of cortically-elicited jaw movements in growing rats

Brain Mechanisms of Oral Motor Functions

Evaluation of occlusal bite force distribution by T-Scan in orthodontic patients with different occlusal characteristics: a cross sectional-observational study

Contact Info

Product

Resources

About