1
|
Kothari SF, Devendran A, Sørensen AB, Nielsen JF, Svensson P, Kothari M. Occurrence, presence and severity of bruxism and its association with altered state of consciousness in individuals with severe acquired brain injury. J Oral Rehabil 2024; 51:143-149. [PMID: 37325820 DOI: 10.1111/joor.13540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 04/26/2023] [Accepted: 06/13/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Excessive jaw muscle activity is a frequent complication after acquired brain injury (ABI). OBJECTIVE The study aimed to identify the occurrence and severity of jaw muscle activity and its association with altered state of consciousness in patients with ABI. METHODS A total of 14 severe ABI patients with varied altered state of consciousness were recruited. A single-channel electromyographic (EMG) device was used to assess the jaw muscle activity for three consecutive nights during Week 1 and Week 4 following admission. Differences in number of EMG episodes/h between Week 1 and 4 were analysed using non-parametric tests and association between the EMG activity and altered state of consciousness were analysed using Spearman's correlation test. RESULTS Nine of fourteen (64%) patients showed indications of bruxism (cutoff: >15 EMG episodes/h). The average EMG episodes/h at admission were 44.5 ± 13.6 with no significant changes after Week 4 of admission (43 ± 12.9; p = .917). The EMG episodes/h ranged from 2 to 184 during Week 1 and 4-154 during Week 4. There were no significant correlations between the number of EMG episodes/h during the three nights and the individuals altered state of consciousness during Week 1 and Week 4. CONCLUSION Patients with ABI had a conspicuously high but variable level of jaw muscle activity at admission and it tend to remain high after 4 week of hospitalisation which could potentially lead to adverse effects such as excessive tooth wear, headaches and pain in jaw muscles. The lack of associations between individuals altered level of consciousness and EMG activity could be due to low sample size and further studies are clearly warranted in this patient group with special needs. Single-channel EMG devices can record jaw muscle activity early in the hospitalisation period and might be a helpful tools for early detection of bruxism in ABI patients.
Collapse
Affiliation(s)
- Simple F Kothari
- Hammel Neurorehabilitation Centre and University Research Clinic, Department of Clinical Medicine, Aarhus University, Hammel, Denmark
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Hammel, Denmark
- Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
| | - Anupriyadarshini Devendran
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Hammel, Denmark
| | - Astrid B Sørensen
- Hammel Neurorehabilitation Centre and University Research Clinic, Department of Clinical Medicine, Aarhus University, Hammel, Denmark
| | - Jørgen Feldbaek Nielsen
- Hammel Neurorehabilitation Centre and University Research Clinic, Department of Clinical Medicine, Aarhus University, Hammel, Denmark
| | - Peter Svensson
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Hammel, Denmark
- Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
- Faculty of Dentistry, Malmø University, Malmö, Sweden
| | - Mohit Kothari
- Hammel Neurorehabilitation Centre and University Research Clinic, Department of Clinical Medicine, Aarhus University, Hammel, Denmark
| |
Collapse
|
2
|
Conti PCR, Cunha CO, Conti ACDCF, Bonjardim LR, Barbosa JS, Costa YM. Secondary bruxism: A valid diagnosis or just a coincidental finding of additional masticatory muscle activity? A narrative review of literature. J Oral Rehabil 2024; 51:74-86. [PMID: 37688286 DOI: 10.1111/joor.13592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 08/08/2023] [Accepted: 08/24/2023] [Indexed: 09/10/2023]
Abstract
INTRODUCTION Bruxism is defined as a repetitive masticatory muscle activity that can manifest it upon awakening (awake bruxism-AB) or during sleep (sleep bruxism-SB). Some forms of both, AB and SB can be associated to many other coexistent factors, considered of risk for the initiation and maintenance of the bruxism. Although controversial, the term 'secondary bruxism' has frequently been used to label these cases. The absence of an adequate definition of bruxism, the non-distinction between the circadian manifestations and the report of many different measurement techniques, however, are important factors to be considered when judging the literature findings. The use (and abuse) of drugs, caffeine, nicotine, alcohol and psychoactive substances, the presence of respiratory disorders during sleep, gastroesophageal reflux disorders and movement, neurological and psychiatric disorders are among these factors. The scarcity of controlled studies and the complexity and interactions among all aforementioned factors, unfortunately, does not allow to establish any causality or temporal association with SB and AB. The supposition that variables are related depends on different parameters, not clearly demonstrated in the available studies. OBJECTIVES This narrative review aims at providing oral health care professionals with an update on the co-risk factors and disorders possibly associated with bruxism. In addition, the authors discuss the appropriateness of the term 'secondary bruxism' as a valid diagnostic category based on the available evidence. CONCLUSION The absence of an adequate definition of bruxism, the non-distinction between the circadian manifestations and the report of many different measurement techniques found in many studies preclude any solid and convincing conclusion on the existence of the 'secondary' bruxism.
Collapse
Affiliation(s)
- Paulo Cesar R Conti
- Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
- Bauru Orofacial Group, University of São Paulo, Bauru, Brazil
| | - Carolina Ortigosa Cunha
- Department of Prosthodontics and Periodontics, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
- Bauru Orofacial Group, University of São Paulo, Bauru, Brazil
| | - Ana Cláudia de Castro F Conti
- Bauru Orofacial Group, University of São Paulo, Bauru, Brazil
- Department of Orthodontics and Pediatric Dentistry, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | - Leonardo R Bonjardim
- Bauru Orofacial Group, University of São Paulo, Bauru, Brazil
- Department of Biologic Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil
| | | | - Yuri Martins Costa
- Bauru Orofacial Group, University of São Paulo, Bauru, Brazil
- Department of Biosciences, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| |
Collapse
|
3
|
Boscato N, Exposto FG, Costa YM, Svensson P. Effect of standardized training in combination with masseter sensitization on corticomotor excitability in bruxer and control individuals: a proof of concept study. Sci Rep 2022; 12:17469. [PMID: 36261447 PMCID: PMC9581922 DOI: 10.1038/s41598-022-21504-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 09/28/2022] [Indexed: 01/12/2023] Open
Abstract
Recently, it has been proposed that bruxism could represent an overlearned behavior due to the absence of corticomotor plasticity following a relevant tooth-clenching task (TCT). This study assessed the modulatory effects of a nerve growth factor (NGF) injection on masseter muscle corticomotor excitability, jaw motor performance, pain, and limitation in bruxer and control participants following a TCT. Participants characterized as definitive bruxers or controls were randomly assigned to have injected into the right masseter muscle either NGF or isotonic saline (IS), resulting in a study with 4 arms: IS_Control (n = 7), IS_Bruxer (n = 7); NGF_Control (n = 6), and NGF_Bruxer (n = 8). The primary outcome was the masseter motor evoked potential (MEP) amplitude measured at baseline and after a TCT. After the interventions, significantly higher and lower MEP amplitude and corticomotor map area were observed, respectively, in the IS_Control and NGF_Control groups (P < 0.05). Precision and accuracy depended on the series and target force level with significant between-group differences (P < 0.01). NGF-induced masseter muscle sensitization, in combination with a training-induced effect, can significantly impact the corticomotor excitability of the masseter muscle in control participants indicating substantial changes in corticomotor excitability, which are not observed in bruxers. These preliminary findings may have therapeuthic implications for the potential to "detrain" and manage bruxism, but further studies with larger sample sizes will be needed to test this new concept.
Collapse
Affiliation(s)
- Noéli Boscato
- grid.411221.50000 0001 2134 6519Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Rio Grande do Sul Brazil ,grid.7048.b0000 0001 1956 2722Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Fernando G. Exposto
- grid.7048.b0000 0001 1956 2722Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark ,Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
| | - Yuri M. Costa
- grid.7048.b0000 0001 1956 2722Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark ,grid.411087.b0000 0001 0723 2494Department of Biosciences, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Peter Svensson
- grid.7048.b0000 0001 1956 2722Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark ,Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark ,grid.32995.340000 0000 9961 9487Faculty of Odontology, Malmö University, Malmö, Sweden
| |
Collapse
|
4
|
Boscato N, Hayakawa H, Iida T, Costa YM, Kothari SF, Kothari M, Svensson P. Impact of oral motor task training on corticomotor pathways and diadochokinetic rates in young healthy participants. J Oral Rehabil 2022; 49:924-934. [PMID: 35722734 PMCID: PMC9543743 DOI: 10.1111/joor.13349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 05/11/2022] [Accepted: 06/11/2022] [Indexed: 11/27/2022]
Abstract
Background Studies addressing the training‐induced neuroplasticity and interrelationships of the lip, masseter, and tongue motor representations in the human motor cortex using single syllable repetition are lacking. Objective This study investigated the impact of a repeated training in a novel PaTaKa diadochokinetic (DDK) orofacial motor task (OMT) on corticomotor control of the lips, masseter, and tongue muscles in young healthy participants. Methods A total of 22 young healthy volunteers performed 3 consecutive days of training in an OMT. Transcranial magnetic stimulation was applied to elicit motor evoked potentials (MEPs) from the lip, masseter, tongue, and first dorsal interosseous (FDI, internal control) muscles. MEPs were assessed by stimulus–response curves and corticomotor mapping at baseline and after OMT. The DDK rate from PaTaKa single syllable repetition and numeric rating scale (NRS) scores were also obtained at baseline and immediately after each OMT. Repeated‐measures analysis of variance was used to detect differences at a significance level of 5%. Results There was a significant effect of OMT and stimulus intensity on the lips, masseter, and tongue MEPs compared to baseline (p < .001), but not FDI MEPs (p > .05). OMT increased corticomotor topographic maps area (p < .001), and DDK rates (p < .01). Conclusion Our findings suggest that 3 consecutive days of a repeated PaTaKa training in an OMT can induce neuroplastic changes in the corticomotor pathways of orofacial muscles, and it may be related to mechanisms underlying the improvement of orofacial fine motor skills due to short‐term training. The clinical utility should now be investigated.
Collapse
Affiliation(s)
- Noéli Boscato
- Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, Pelotas, Brazil.,Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Hidetoshi Hayakawa
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.,Division of Oral Function and Rehabilitation, Department of Oral Health Science, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - Takashi Iida
- Division of Oral Function and Rehabilitation, Department of Oral Health Science, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - Yuri M Costa
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.,Department of Biosciences, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| | - Simple Futarmal Kothari
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.,Hammel Neurorehabilitation Centre and University Research Clinic, Department of Clinical Medicine, Aarhus University, Hammel, Denmark.,Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
| | - Mohit Kothari
- Hammel Neurorehabilitation Centre and University Research Clinic, Department of Clinical Medicine, Aarhus University, Hammel, Denmark.,Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark.,JSS Dental College and Hospital, JSS Academy of Higher Education and Research, Mysore, India
| | - Peter Svensson
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.,Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark.,Faculty of Odontology, Malmö University, Malmö, Sweden
| |
Collapse
|
5
|
Abe S, Huynh NT, Kato T, Rompré PH, Landry-Schönbeck A, Landry ML, de Grandmont P, Kawano F, Lavigne GJ. Oral appliances reduce masticatory muscle activity-sleep bruxism metrics independently of changes in heart rate variability. Clin Oral Investig 2022; 26:5653-5662. [PMID: 35538329 DOI: 10.1007/s00784-022-04520-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 04/24/2022] [Indexed: 11/03/2022]
Abstract
OBJECTIVES Sleep bruxism (SB) is associated with physiological activities including sympathetic autonomic system dominance and sleep micro-arousal. While oral appliances (OA) are used to prevent SB harmful effects, the influence of OAs physiological mechanisms during sleep is unknown. The aim of this study is to assess whether heart rate variability (HRV) changes, as a marker of autonomic nervous system activity, would be associated with the OA mechanism of action on SB using occlusal splint (OS) and mandibular advancement splint (MAS). MATERIALS AND METHODS A retrospective analysis, from data previously collected in 21 participants with SB (25.6 ± 4.5 years) with polysomnographic recordings, was done. HRV data were compared between a reference night (no-device) and ones during which OS or MAS was used in a crossover study design. Rhythmic masticatory muscle activity (RMMA) index was compared between nights. HRV was evaluated using autoregressive model analysis for three sections: baseline (distance from RMMA), immediately before, and after RMMA period. RESULTS A significant reduction in RMMA index, when wearing OA during sleep, was observed (P < 0.01), but was not associated with HRV parameters change. HRV significantly changed after RMMA onset for nights with OA during non-REM sleep in comparison with baseline (P < 0.02). CONCLUSIONS The usage of OAs for SB participants reduced RMMA, but most likely independently of changes in HRV linked to the mechanism associated with SB genesis. CLINICAL RELEVANCE Wearing OA seems to reduce grinding noise and protect from dental injuries but does not seem to influence SB genesis.
Collapse
Affiliation(s)
- Susumu Abe
- Center for Advanced Research in Sleep Medicine, Research Centre, Hôpital du Sacré-Coeur de Montréal, 5400 boul, Gouin Ouest, Québec, H4J 1C5, Montréal, Canada. .,Faculté de Médecine Dentaire, Université de Montréal, CP 6128, Succursale Centre- ville, Montréal, Québec, H3C 3J7, Canada. .,Department of Comprehensive Dentistry, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima, 770-8504, Japan.
| | - Nelly T Huynh
- Faculté de Médecine Dentaire, Université de Montréal, CP 6128, Succursale Centre- ville, Montréal, Québec, H3C 3J7, Canada
| | - Takafumi Kato
- Department of Oral Physiology, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka, Suita, Osaka, 565-0871, Japan
| | - Pierre H Rompré
- Faculté de Médecine Dentaire, Université de Montréal, CP 6128, Succursale Centre- ville, Montréal, Québec, H3C 3J7, Canada
| | - Anaïs Landry-Schönbeck
- Faculté de Médecine Dentaire, Université de Montréal, CP 6128, Succursale Centre- ville, Montréal, Québec, H3C 3J7, Canada
| | - Marie-Lou Landry
- Faculté de Médecine Dentaire, Université de Montréal, CP 6128, Succursale Centre- ville, Montréal, Québec, H3C 3J7, Canada
| | - Pierre de Grandmont
- Faculté de Médecine Dentaire, Université de Montréal, CP 6128, Succursale Centre- ville, Montréal, Québec, H3C 3J7, Canada
| | - Fumiaki Kawano
- Department of Comprehensive Dentistry, Tokushima University Graduate School of Biomedical Sciences, 3-18-15 Kuramoto-cho, Tokushima, 770-8504, Japan
| | - Gilles J Lavigne
- Center for Advanced Research in Sleep Medicine, Research Centre, Hôpital du Sacré-Coeur de Montréal, 5400 boul, Gouin Ouest, Québec, H4J 1C5, Montréal, Canada.,Faculté de Médecine Dentaire, Université de Montréal, CP 6128, Succursale Centre- ville, Montréal, Québec, H3C 3J7, Canada
| |
Collapse
|
6
|
Boscato N, Exposto F, Nascimento GG, Svensson P, Costa YM. Is bruxism associated with changes in neural pathways? A systematic review and meta-analysis of clinical studies using neurophysiological techniques. Brain Imaging Behav 2022; 16:2268-2280. [PMID: 35088353 DOI: 10.1007/s11682-021-00601-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/03/2021] [Indexed: 12/23/2022]
Abstract
This study aimed to systematically review the literature to identify clinical studies assessing neuroplasticity changes induced by or associated with bruxism or a tooth-clenching task using neurophysiological techniques. Searches were performed in five electronic databases (PubMed, EMBASE, Scopus, Web of Science, and Google Scholar) in April 2020. This review included clinical studies using neurophysiological techniques to assess neuroplasticity changes in healthy participants before and after a tooth-clenching task or comparing bruxers and non-bruxers. The quality assessment was performed with the Joanna Briggs Institute tool and Grading of Recommendations Assessment, Development, and Evaluation. Meta-analyses were conducted with studies reporting similar comparisons regarding masseter motor evoked potential amplitude and signal change outcomes. Of 151 articles identified in the searches, nine were included, and five proceeded to meta-analysis. Included studies presented moderate to very low methodological quality. From these included studies, eight evaluated bruxers and non-bruxers, of which five of them observed brain activity differences between groups, and three found no differences. Even so, all studies have suggested distinct difference in the central excitability between bruxers and non-bruxers, the meta-analysis revealed no statistically significant differences (P > 0.05). It appears that bruxism seems, indeed, to be associated with distinct differences in the neural pathways related to the control of the jaw-closing muscles, but that considerable variability in terms of classification of bruxism and assessment of neuroplasticity hamper a definite conclusion. Future research projects should take these concerns into consideration in order to further the understanding of bruxism physiology and pathophysiology.
Collapse
Affiliation(s)
- Noéli Boscato
- Department of Restorative Dentistry, School of Dentistry, Federal University of Pelotas, Gonçalves Chaves Street 457, CEP 96015-560, Pelotas, RS, Brazil. .,Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.
| | - Fernando Exposto
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.,Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
| | - Gustavo G Nascimento
- Section for Periodontology, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Peter Svensson
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.,Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark.,Faculty of Odontology, Malmö University, Malmö, Sweden
| | - Yuri M Costa
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark.,Department of Biosciences, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil
| |
Collapse
|
7
|
Schimmel M, Aarab G, Baad‐Hansen L, Lobbezoo F, Svensson P. A conceptual model of oro-facial health with an emphasis on function. J Oral Rehabil 2021; 48:1283-1294. [PMID: 34462948 PMCID: PMC9292770 DOI: 10.1111/joor.13250] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 07/14/2021] [Accepted: 08/24/2021] [Indexed: 11/29/2022]
Abstract
The individual inclination to lead an autonomous life until death is associated with requirements that may be of physiological, psychosocial and environmental nature. We aim to describe a conceptual oro-facial health model with an emphasis on oro-facial function, taking the domains of quality of life and patient-centred values into account. In the context of oro-facial function, the requirements of life are met when the oro-facial system is in a fit state. 'Fitness of the oro-facial system, that is oro-facial health, is a state that is characterised by an absence of, or positive coping with physical disease, mental disease, pain and negative environmental and social factors. It will allow natural oro-facial functions such as sensing, tasting, touching, biting, chewing, swallowing, speaking, yawning, kissing and facial expression'. In the presented conceptual model of oro-facial health, it is postulated that each individual has present and future potentials related to biological prerequisites and resources that are developed by an individual through the course of life. These potentials form the oro-facial functional capacity. When the individual potentials together do not meet the requirements of life anymore, dysfunction and disease result. The oro-facial system is subject to physiological ageing processes, which will inevitably lead to a decrease in the oro-facial functional capacity. Furthermore, comorbid medical conditions might hamper oro-facial function and, alongside with the ageing process, may lead to a state of oral hypofunction. Currently, there is a lack of widespread, validated, easy-to-use instruments that help to distinguish between states of oro-facial fitness as opposed to oral hypofunction. Clearly, research is needed to establish adequate, validated instruments alongside with functional rehabilitation procedures.
Collapse
Affiliation(s)
- Martin Schimmel
- Department of Reconstructive Dentistry and GerodontologyUniversity of BernBernSwitzerland
- Division of Gerodontology and Removable ProsthodonticsUniversity of GenevaGenevaSwitzerland
| | - Ghizlane Aarab
- Department of Orofacial Pain and DysfunctionAcademic Centre for Dentistry Amsterdam (ACTA)University of Amsterdam and Vrije Universiteit AmsterdamAmsterdamThe Netherlands
| | - Lene Baad‐Hansen
- Department of Dentistry and Oral HealthSection for Orofacial Pain and Jaw FunctionAarhus UniversityAarhusDenmark
- Scandinavian Center for Orofacial Neurosciences (SCON)AarhusDenmark
| | - Frank Lobbezoo
- Department of Orofacial Pain and DysfunctionAcademic Centre for Dentistry Amsterdam (ACTA)University of Amsterdam and Vrije Universiteit AmsterdamAmsterdamThe Netherlands
| | - Peter Svensson
- Department of Dentistry and Oral HealthSection for Orofacial Pain and Jaw FunctionAarhus UniversityAarhusDenmark
- Scandinavian Center for Orofacial Neurosciences (SCON)AarhusDenmark
- Faculty of OdontologyMalmø UniversitySweden
| |
Collapse
|
8
|
Matsuzaki S, Shimada A, Tanaka J, Kothari M, Castrillon E, Iida T, Svensson P. Effect of mandibular advancement device on plasticity in corticomotor control of tongue and jaw muscles. J Clin Sleep Med 2021; 17:1805-1813. [PMID: 33904391 DOI: 10.5664/jcsm.9284] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES This study aims to investigate if the use of a mandibular advancement device (MAD) is associated with neuroplasticity in corticomotor control of tongue and jaw muscles. METHODS Eighteen healthy individuals participated in a randomized crossover study with 3 conditions for 2 weeks each: baseline, wearing an oral appliance (OA: sham MAD) or MAD during sleep. The custom-made MAD was constructed by positioning the mandible to 50% of its maximal protrusion limit. Transcranial magnetic stimulation (TMS) was applied to elicit motor evoked potentials (MEPs). The MEPs were assessed by constructing stimulus-response curves at four stimulus intensities: 90%, 100%, 120%, and 160% of the motor threshold (MT) from the right tongue and right masseter, and the first dorsal interosseous muscles (FDI, control) at baseline, after the first and the second intervention. RESULTS There was a significant effect of condition and stimulus intensity both on the tongue and as well as on masseter MEPs (P < 0.01). Tongue and masseter MEPs were significantly higher at 120% and 160% following the MAD compared to the OA (P < 0.05). There were no effects of condition on FDI MEPs (P = 0.855). CONCLUSIONS The finding suggests that MAD induces neuroplasticity in the corticomotor pathway of the tongue and jaw muscles associated with the new jaw position. Further investigations are required in patients with obstructive sleep apnea (OSA) to see if this cortical neuroplasticity may contribute or perhaps predict treatment effects with MADs in OSA.
Collapse
Affiliation(s)
- Satoshi Matsuzaki
- Section of Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Faculty of Health, Aarhus University, Denmark.,Scandinavian Center for Orofacial Neurosciences (SCON).,Department of Fixed Prosthodontics and Occlusion, Osaka Dental University, Japan
| | - Akiko Shimada
- Department of Geriatric Dentistry, Osaka Dental University, Japan
| | - Junko Tanaka
- Department of Fixed Prosthodontics and Occlusion, Osaka Dental University, Japan
| | - Mohit Kothari
- Hammel Neurorehabilitation and University Research Clinic, Department of Clinic Medicine, Aarhus University, Hammel, Denmark.,JSS Dental College and Hospital, JSS Academy of Higher Education and Research, Mysore, India
| | - Eduardo Castrillon
- Section of Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Faculty of Health, Aarhus University, Denmark.,Scandinavian Center for Orofacial Neurosciences (SCON)
| | - Takashi Iida
- Division of Oral Function and Rehabilitation, Department of Oral Health Science, Nihon University School of Dentistry at Matsudo
| | - Peter Svensson
- Section of Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Faculty of Health, Aarhus University, Denmark.,Scandinavian Center for Orofacial Neurosciences (SCON).,Faculty of Odontology, Malmø University, Sweden
| |
Collapse
|
9
|
Plasticity in corticomotor pathways linked to a jaw protrusion training task: Potential implications for management of patients with obstructive sleep apnea. Brain Res 2020; 1749:147124. [DOI: 10.1016/j.brainres.2020.147124] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 08/20/2020] [Accepted: 09/08/2020] [Indexed: 12/13/2022]
|
10
|
Prefrontal cortex activity induced by periodontal afferent inputs downregulates occlusal force. Exp Brain Res 2019; 237:2767-2774. [DOI: 10.1007/s00221-019-05630-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 08/14/2019] [Indexed: 10/26/2022]
|
11
|
Combination of jaw and tongue movement training influences neuroplasticity of corticomotor pathways in humans. Exp Brain Res 2019; 237:2559-2571. [PMID: 31346648 DOI: 10.1007/s00221-019-05610-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Accepted: 07/18/2019] [Indexed: 01/30/2023]
Abstract
Since humans in daily life perform multiple motor behaviors that often involve the simultaneous activation of both jaw and tongue muscles, it is essential to understand the effects of combined orofacial sensorimotor tasks on plasticity in corticomotor pathways. Moreover, to establish novel rehabilitation programs for patients, it is important to clarify the possible interrelationships in corticomotor excitability between jaw and tongue motor control. The aim of this study was to examine the effect of a combination of a repetitive tooth bite task (TBT) and a repetitive tongue lift task (TLT) on corticomotor excitability of the tongue and jaw muscles as assessed by transcranial magnetic stimulation (TMS). Sixteen healthy individuals participated in three kinds of training tasks consisting of 41-min TBT, 41-min TLT, and 82-min TBT + TLT. Motor-evoked potentials (MEPs) from the tongue muscle, masseter muscle, and first dorsal interosseous muscle were measured before and after the training tasks. The amplitude of tongue MEPs after training with TLT and TLT + TBT, and masseter MEPs after training with TBT and TLT + TBT, were significantly higher than before training (P < 0.05). Tongue MEPs and masseter MEPs were significantly higher after TLT + TBT than after TBT or TLT (P < 0.05). The present results suggest that a task combining both jaw and tongue movement training is associated with a greater degree of neuroplasticity in the corticomotor control of jaw and tongue muscles than either task alone.
Collapse
|