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Greenbaum T, Kalichman L, Kedem R, Emodi-Perlman A. The mouth-opening muscular performance in adults and elderlies with and without dysphagia: A systematic review and meta-analysis. Arch Gerontol Geriatr 2024; 124:105448. [PMID: 38653018 DOI: 10.1016/j.archger.2024.105448] [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: 02/20/2024] [Revised: 04/07/2024] [Accepted: 04/15/2024] [Indexed: 04/25/2024]
Abstract
OBJECTIVES To characterize mouth-opening muscular performance (MOMP) in adults and elderly individuals with dysphagia and healthy controls. METHODS We searched the PubMed, EMBASE, CINAHL, Cochrane, Scopus, and Web of Science databases from inception to Jan. 26, 2023. Two independent researchers considered the titles, abstracts, and full texts of potentially eligible papers from 1451 search results. Twenty-five studies that evaluated mouth-opening maximal strength (MOMS) in healthy adults, elderly individuals, and patients with dysphagia met the inclusion criteria. RESULTS We found comparable, reliable values with significant sex differences in maximal mouth opening strength (MMOS) in the meta-analysis for healthy elderly patients (females 5.31 ± 0.47 kg vs. males 7.04 ± 0.70 kg; mean difference of 0.84 kg). Age has also emerged as an essential factor in reducing strength. There was a significant reduction in the MMOS score in the only study that compared dysphagic individuals to healthy elderly individuals. In another study, the MMOS score was comparable to the meta-analysis of healthy elderly individuals. CONCLUSIONS Both sex and age play significant roles in the MMOS. There is no reliable data on the normal mouth-opening strength and endurance of healthy adults, patients with dysphagia, or individuals with other relevant clinical problems.
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Affiliation(s)
- Tzvika Greenbaum
- Department of Physical Therapy, Faculty of Health Sciences, Recanati School for Community Health Professions, Ben-Gurion University of the Negev, Beer Sheva, Israel.
| | - Leonid Kalichman
- Department of Physical Therapy, Faculty of Health Sciences, Recanati School for Community Health Professions, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Ron Kedem
- Academic Branch, Medical Corps, IDF, Tel Aviv, Israel
| | - Alona Emodi-Perlman
- The School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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2
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Kothari SF, Devendran A, Kumar A, de Caxias FP, Svensson P. Signal to noise ratio of masticatory muscle activity of functional and non-functional oral tasks. J Oral Rehabil 2024; 51:1599-1609. [PMID: 38837445 DOI: 10.1111/joor.13714] [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: 06/13/2023] [Revised: 03/02/2024] [Accepted: 04/15/2024] [Indexed: 06/07/2024]
Abstract
BACKGROUND Electromyographic activity (EMG) of masticatory muscles during wakefulness is understudied. It is unclear if single channel ambulatory EMG devices are sensitive enough to detect masticatory muscle activity (MMA) during wakefulness. OBJECTIVES To compare the MMA of various oral tasks recorded with a single channel EMG device ((Grindcare4-datalogger Prototype device) (GC4-β)) and a conventional EMG (cEMG) device. METHODS EMG activity of 30 standardised oral tasks was recorded unilaterally from the masseter and anterior temporalis muscle in 24 healthy volunteers using GC4-β and a cEMG device. To compare the EMG data, signal-to-noise ratios (SNR) were calculated as a way to normalise EMG activity across tasks. Analysis of variance was used to compare the SNR between the devices, muscles and oral tasks. RESULTS SNR measured from GC4-β was overall significantly higher than the cEMG device (p =.001). The SNR for maximum voluntary contraction (MVC) was significantly higher than all other tasks (p <.001). SNR for temporalis with GC4-β was significantly higher for MVC, hard food, soft food, gum chewing (dominant side), rhythmic clenching and upper lip biting compared to the cEMG device (p <.021). The SNR for masseter with GC4-β was significantly higher for hard food and gum chewing (dominant side), rhythmic clenching, rhythmic biting of an object and yawning compared to the cEMG device (p <.022). CONCLUSIONS This study provides novel insight into the EMG patterns of numerous oral tasks enhancing knowledge of physiological differences between the masticatory muscles. Further, single channel EMG devices can effectively measure the EMG activity of various oral tasks during wakefulness.
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Affiliation(s)
- Simple Futarmal Kothari
- 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
- Hammel Neurorehabilitation and University Research Clinic, Hammel, Denmark
| | - Anupriyadarshini Devendran
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Abhishek Kumar
- Scandinavian Center for Orofacial Neurosciences (SCON), Aarhus, Denmark
- Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden
- Academic Centre for Geriatric Dentistry, Stockholm, Sweden
| | - Fernanda P de Caxias
- Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), School of Dentistry, Araçatuba, Brazil
| | - 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
- Department of Orofacial Pain and Jaw Function, Faculty of Odontology, Malmö University, Malmö, Sweden
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3
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Yang C, Teng H, Shao B, Liu Z. Biomechanical study of temporomandibular joints of patients with temporomandibular disorders under incisal clenching: A finite element analysis. J Biomech 2024; 166:112065. [PMID: 38555778 DOI: 10.1016/j.jbiomech.2024.112065] [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: 09/25/2023] [Revised: 03/01/2024] [Accepted: 03/25/2024] [Indexed: 04/02/2024]
Abstract
Temporomandibular disorders (TMD) encompass a collection of pathologies. Within the multitude of etiological factors contributing to TMD, mechanical factors hold significant importance. The aim of this investigation was to assess the magnitude and distribution of stresses encountered by the temporomandibular joints (TMJs) during incisal clenching among TMD patients while also elucidating the mechanical pathogenesis underlying TMD. Ten asymptomatic subjects and ten TMD patients were recruited. The Control, Bilateral, and Unilateral groups were set. The contact stress, maximum principal stress, and minimum principal stresses of TMJ structures among the groups were compared. In addition, comparisons of the contact stress distribution among the groups were adopted. In the Control and Bilateral groups, the magnitudes of stresses (contact stress, maximum and minimum principal stresses) between the right and left sides showed no significant difference (P > 0.05). For unilateral TMD patients,the minimum principal stress on the condyle in the Uni-N group (the normal side) was significantly greater than thatin the Uni-T group (the TMD side)(P = 0.016, mean difference 9.99 MPa [95 %CI: 3.11 to 16.87]). Furthermore, stresses on the condyle and fossa of the patients were significantly greater than those of asymptomatic subjects (P < 0.05). The contact stress distributions were concentrated in the Control group while irregular in the TMD groups. In conclusion, asymmetrical contact stress distributions were observed in unilateral TMD, with excessive stresses on the healthy side. The protection of the healthy TMJ during treatment is recommended for patients with unilateral TMD.
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Affiliation(s)
- Chunxin Yang
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu 610065, China; Yibin Institute of Industrial Technology/Sichuan University, Yibin Park, Yibin 644600, China
| | - Haidong Teng
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu 610065, China; Yibin Institute of Industrial Technology/Sichuan University, Yibin Park, Yibin 644600, China
| | - Bingmei Shao
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu 610065, China; Yibin Institute of Industrial Technology/Sichuan University, Yibin Park, Yibin 644600, China
| | - Zhan Liu
- Key Laboratory of Biomechanical Engineering of Sichuan Province, Sichuan University, Chengdu 610065, China; Yibin Institute of Industrial Technology/Sichuan University, Yibin Park, Yibin 644600, China.
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4
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Sagl B, Schmid-Schwap M, Piehslinger E, Yao H, Rausch-Fan X, Stavness I. The effect of bolus properties on muscle activation patterns and TMJ loading during unilateral chewing. J Mech Behav Biomed Mater 2024; 151:106401. [PMID: 38237207 DOI: 10.1016/j.jmbbm.2024.106401] [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: 09/28/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 02/03/2024]
Abstract
Mastication is a vital human function and uses an intricate coordination of muscle activation to break down food. Collection of detailed muscle activation patterns is complex and commonly only masseter and anterior temporalis muscle activation are recorded. Chewing is the orofacial task with the highest muscle forces, potentially leading to high temporomandibular joint (TMJ) loading. Increased TMJ loading is often associated with the onset and progression of temporomandibular disorders (TMD). Hence, studying TMJ mechanical stress during mastication is a central task. Current TMD self-management guidelines suggest eating small and soft pieces of food, but patient safety concerns inhibit in vivo investigations of TMJ biomechanics and currently no in silico model of muscle recruitment and TMJ biomechanics during chewing exists. For this purpose, we have developed a state-of-the-art in silico model, combining rigid body bones, finite element TMJ discs and line actuator muscles. To solve the problems regarding muscle activation measurement, we used a forward dynamics tracking approach, optimizing muscle activations driven by mandibular motion. We include a total of 256 different combinations of food bolus size, stiffness and position in our study and report kinematics, muscle activation patterns and TMJ disc von Mises stress. Computed mandibular kinematics agree well with previous measurements. The computed muscle activation pattern stayed stable over all simulations, with changes to the magnitude relative to stiffness and size of the bolus. Our biomedical simulation results agree with the clinical guidelines regarding bolus modifications as smaller and softer food boluses lead to less TMJ loading. The computed mechanical stress results help to strengthen the confidence in TMD self-management recommendations of eating soft and small pieces of food to reduce TMJ pain.
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Affiliation(s)
- Benedikt Sagl
- Center for Clinical Research, University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria.
| | - Martina Schmid-Schwap
- Division of Prosthodontics, University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria
| | - Eva Piehslinger
- Division of Prosthodontics, University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria
| | - Hai Yao
- Department of Bioengineering, Clemson University, 29634, Clemson, SC, United States; Department of Oral Health Sciences, Medical University of South Carolina, 29425, Charleston, SC, United States
| | - Xiaohui Rausch-Fan
- Center for Clinical Research, University Clinic of Dentistry, Medical University of Vienna, 1090, Vienna, Austria
| | - Ian Stavness
- Department of Computer Science, University of Saskatchewan, SK S7N 5C9 Saskatoon, Saskatchewan, Canada
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5
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Bracci A, Lobbezoo F, Colonna A, Bender S, Conti PCR, Emodi-Perlman A, Häggman-Henrikson B, Klasser GD, Michelotti A, Lavigne GJ, Svensson P, Ahlberg J, Manfredini D. Research routes on awake bruxism metrics: Implications of the updated bruxism definition and evaluation strategies. J Oral Rehabil 2024; 51:150-161. [PMID: 37191494 DOI: 10.1111/joor.13514] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Accepted: 05/10/2023] [Indexed: 05/17/2023]
Abstract
BACKGROUND With time, due to the poor knowledge on it epidemiology, the need to focus on awake bruxism as a complement of sleep studies emerged. OBJECTIVE In line with a similar recent proposal for sleep bruxism (SB), defining clinically oriented research routes to implement knowledge on awake bruxism (AB) metrics is important for an enhanced comprehension of the full bruxism spectrum, that is better assessment and more efficient management. METHODS We summarised current strategies for AB assessment and proposed a research route for improving its metrics. RESULTS Most of the literature focuses on bruxism in general or SB in particular, whilst knowledge on AB is generally fragmental. Assessment can be based on non-instrumental or instrumental approaches. The former include self-report (questionnaires, oral history) and clinical examination, whilst the latter include electromyography (EMG) of jaw muscles during wakefulness as well as the technology-enhanced ecological momentary assesment (EMA). Phenotyping of different AB activities should be the target of a research task force. In the absence of available data on the frequency and intensity of wake-time bruxism-type masticatory muscle activity, any speculation about the identification of thresholds and criteria to identify bruxers is premature. Research routes in the field must focus on the improvement of data reliability and validity. CONCLUSIONS Probing deeper into the study of AB metrics is a fundamental step to assist clinicians in preventing and managing the putative consequences at the individual level. The present manuscript proposes some possible research routes to advance current knowledge. At different levels, instrumentally based and subject-based information must be gathered in a universally accepted standardised approach.
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Affiliation(s)
- Alessandro Bracci
- Department of Neuroscience, School of Dentistry, University of Padova, Padova, Italy
| | - Frank Lobbezoo
- Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Anna Colonna
- Department of Biomedical Technologies, School of Dentistry, University of Siena, Siena, Italy
| | - Steven Bender
- Department of Oral and Maxillofacial Surgery, Texas A&M School of Dentistry, Dallas, Texas, USA
| | - Paulo C R Conti
- Bauru School of Dentistry, University of Sao Paulo, São Paulo, Brazil
| | - Alona Emodi-Perlman
- Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Telaviv, Israel
| | | | - Gary D Klasser
- Department of Diagnostic Sciences, Louisiana State University School of Dentistry, New Orleans, Louisiana, USA
| | - Ambra Michelotti
- Department of Neurosciences, Reproductive Sciences and Oral Sciences, Section of Orthodontics and Temporomandibular Disorders, University of Naples Federico II, Naples, Italy
| | - Gilles J Lavigne
- Center for Advanced Research in Sleep Medicine, Research Centre, Hôpital du Sacré-Coeur de Montréal, and Universite de Montreal, Montreal, Quebec, Canada
| | - Peter Svensson
- Section for Orofacial Pain and Jaw Function, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Jari Ahlberg
- Department of Oral and Maxillofacial, Diseases, University of Helsinki, Helsinki, Finland
| | - Daniele Manfredini
- Department of Biomedical Technologies, School of Dentistry, University of Siena, Siena, Italy
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Prasad S, Farella M. Wearables for personalized monitoring of masticatory muscle activity - opportunities, challenges, and the future. Clin Oral Investig 2023; 27:4861-4867. [PMID: 37410151 DOI: 10.1007/s00784-023-05127-7] [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: 09/13/2022] [Accepted: 06/20/2023] [Indexed: 07/07/2023]
Abstract
Wearable devices are worn on or remain in close proximity of the human body. The use of wearable devices specific to the orofacial region is steadily increasing. Orofacial applications of wearable devices include supplementing diagnosis, tracking treatment progress, monitoring patient compliance, and understanding oral parafunctional behaviours. In this short communication, the role of wearable devices in advancing personalized dental medicine are highlighted with a specific focus on masticatory muscle activity monitoring in naturalistic settings. Additionally, challenges, opportunities, as well as future research areas for successful use of wearable devices for precise, personalized care of muscle disorders are discussed.
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Affiliation(s)
- Sabarinath Prasad
- Department of Orthodontics, Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University, Dubai, United Arab Emirates.
| | - Mauro Farella
- Discipline of Orthodontics, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
- Discipline of Orthodontics and Pediatric Dentistry, Department of Surgical Science, University of Cagliari, Cagliari, Italy
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7
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Sugano T, Ogawa T, Yoda N, Hashimoto T, Shobara K, Niizuma K, Kawashima R, Sasaki K. Morphological comparison of masseter muscle fibers in the mandibular rest and open positions using diffusion tensor imaging. J Oral Rehabil 2022; 49:608-615. [PMID: 35334120 DOI: 10.1111/joor.13319] [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: 12/27/2021] [Revised: 02/22/2022] [Accepted: 03/19/2022] [Indexed: 12/01/2022]
Abstract
BACKGROUND The masseter muscle has a complicated multipennate internal structure and exhibits functional differentiation when performing various stomatognathic functions. It is important to understand the internal structural changes of the muscle during functioning to elucidate characteristic muscle disorders such as local myalgia. Diffusion tensor imaging (DTI) may be useful for investigating the internal structural features of muscle. OBJECTIVES To evaluate the features of masseter muscle fibers in human participants using DTI fiber tractography, and to elucidate the structural differences in the masseter muscle between the mandibular rest and open positions. METHODS Five healthy men (age 31±7 years) underwent DTI and T1-weighted MRI of the right masseter muscle in the mandibular rest and open positions. MR images were used as a reference for muscle layer segmentation (superficial, intermediate, and deep). DTI fiber tractography of the masseter muscle was performed and the orientation of the DTI fibers was analyzed in each layer using coordinates based on the Frankfurt horizontal plane. RESULTS The DTI fiber orientation of the deep layer significantly changed between the mandibular rest and open positions in the frontal plane (p<0.05, Wilcoxon rank sum test). However, no significant change was found in the superficial and intermediate layers. CONCLUSION DTI fiber tractography confirmed regional differences in the orientation change of the masseter muscle fibers between different mandibular positions. The results may support the existence of functional partitioning inside the masseter muscle and suggest that DTI may be useful for the evaluation of muscle fibers in multipennate muscles.
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Affiliation(s)
- Takehiko Sugano
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Japan
| | - Toru Ogawa
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Japan
| | - Nobuhiro Yoda
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Japan
| | - Teruo Hashimoto
- Institute of Development, Aging and Cancer, Tohoku University, Japan
| | - Kenta Shobara
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Japan
| | - Kuniyasu Niizuma
- Department of Neurosurgical Engineering and Translational Neuroscience, Graduate School of Biomedical Engineering, Tohoku University, Japan.,Department of Neurosurgical Engineering and Translational Neuroscience, Tohoku University Graduate School of Medicine, Japan.,Department of Neurosurgery, Tohoku University Graduate School of Medicine, Japan
| | - Ryuta Kawashima
- Institute of Development, Aging and Cancer, Tohoku University, Japan
| | - Keiichi Sasaki
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, Japan
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Li D, Aarab G, Lobbezoo F, Arcache P, Lavigne GJ, Huynh N. Accuracy of sleep bruxism scoring based on electromyography traces of different jaw muscles in individuals with obstructive sleep apnea. J Clin Sleep Med 2022; 18:1609-1615. [PMID: 35212262 DOI: 10.5664/jcsm.9940] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES Sleep bruxism is characterized by rhythmic masticatory muscle activity (RMMA). This study aimed to determine the number and type of jaw muscles needed for a valid RMMA scoring in individuals with obstructive sleep apnea (OSA). METHODS 10 individuals with OSA (4 males; age = 50.1 ± 8.1 years) were included in this study. RMMA was scored using one or more of the following jaw muscles' electromyography (EMG) traces of polysomnography recordings: bilateral masseter and temporalis (4MT; the reference standard), unilateral masseter (1M), bilateral masseter (2M), unilateral temporalis (1T), bilateral temporalis (2T), unilateral chin EMG (1C), and bilateral chin EMG (2C). RESULTS 1M, 2M, 1T, and 2T showed excellent agreement with 4MT (intraclass correlation coefficient [ICC] = 0.751, 0.976, 0.815, and 0.950, respectively), while 1C and 2C presented fair agreement (ICC= 0.662 and 0.657). Besides, 2M and 2T displayed good sensitivity (87.8% and 72.0%) and positive predictive value (PPV; 83.1% and 76.0%). In contrast, 1M and 1T had good sensitivity (88.4% and 87.8%) but fair PPV (60.1% and 53.2%). 1C and 2C showed poor sensitivity (41.1% and 40.3%) and fair PPV (62.9% and 60.6%). CONCLUSIONS Polysomnography with bilateral masseter or temporalis muscle EMG traces is regarded valid in RMMA scoring in individuals with OSA. In contrast, unilateral masseter or temporalis muscle EMG showed only fair accuracy, and chin EMG had poor accuracy. Consequently, these montages cannot be recommended for RMMA scoring in the presence of OSA. CLINICAL TRIAL REGISTRATION Registry: ClinicalTrials.gov; Name: The Effects of Oral Appliance Therapy on Masseter Muscle Activity in Obstructive Sleep Apnea; Identifier: NCT02011425.
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Affiliation(s)
- Deshui Li
- Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Ghizlane Aarab
- Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.,Faculté de Médicine Dentaire, Université de Montréal, Montréal, Canada
| | - Frank Lobbezoo
- Department of Orofacial Pain and Dysfunction, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - Patrick Arcache
- Faculté de Médicine Dentaire, Université de Montréal, Montréal, Canada
| | - Gilles J Lavigne
- Faculté de Médicine Dentaire, Université de Montréal, Montréal, Canada
| | - Nelly Huynh
- Faculté de Médicine Dentaire, Université de Montréal, Montréal, Canada
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Greenbaum T, Pitance L, Kedem R, Emodi-Perlman A. The mouth-opening muscular performance in adults with and without temporomandibular disorders: A systematic review. J Oral Rehabil 2022; 49:476-494. [PMID: 35020217 PMCID: PMC9303535 DOI: 10.1111/joor.13303] [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: 08/14/2021] [Revised: 12/20/2021] [Accepted: 01/04/2022] [Indexed: 11/30/2022]
Abstract
Background The mouth‐opening muscular performance in patients with temporomandibular disorders (TMDs) is unclear. Understanding the impairments of this muscle group within specific TMDs is important to develop proper management strategies. Objective To characterise the mouth‐opening muscular performance in adults with and without TMDs. Methods PubMed, EMBASE, CINAHL, Scopus, Web of Science and Cochrane databases were searched from inception to 12 November 2020. Bibliographies were searched for additional articles, including grey literature. Case‐control, cross‐sectional and interventional studies reporting mouth‐opening muscular strength and/or endurance were included. Risk of bias was assessed by the SIGN checklist for case‐control studies and by the NIH quality assessment tool for cross‐sectional studies. Results were pooled with a random‐effects model. Confidence in cumulative evidence was determined by means of the GRADE guidelines. Results Fourteen studies were included; most were rated as having a moderate risk of bias. Only three studies assessed patients with TMDs and the other 11 assessed healthy adults. Significant sex differences in muscular performance were found for healthy adults in the review (strength deficit for females versus males). There was a significant reduction in maximal mouth opening performance (strength and endurance) in the three studies that assessed patients with temporomandibular disorders. Conclusion Sex plays a significant role in maximal mouth opening strength. There is a lack of reliable data on the normal mouth‐opening strength and endurance of healthy adults as well as for patients with TMDs. Implications Lack of reliable TMDs patient data and comparable healthy adult data highlight future direction for research.
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Affiliation(s)
- Tzvika Greenbaum
- Department of Physical Therapy, Faculty of Health Sciences, Recanati School for Community Health Professions, Ben-Gurion University of the Negev, Beer Sheva, Israel
| | - Laurent Pitance
- Institute of Experimental and Clinical Research, Health Sciences division, Neuro-Musculo-Skeletal-Lab (NMSK), Université Catholique de Louvain, Brussels, Belgium
| | - Ron Kedem
- Academic Branch, Medical Corps, IDF, Tel Aviv, Israel
| | - Alona Emodi-Perlman
- The School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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10
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Bricio-Barrios JA, Ríos-Bracamontes E, Ríos-Silva M, Huerta M, Serrano-Moreno W, Barrios-Navarro JE, Ortiz GG, Huerta-Trujillo M, Guzmán-Esquivel J, Trujillo X. Alterations in blink and masseter reflex latencies in older adults with neurocognitive disorder and/or diabetes mellitus. World J Clin Cases 2022; 10:177-188. [PMID: 35071517 PMCID: PMC8727253 DOI: 10.12998/wjcc.v10.i1.177] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 07/30/2021] [Accepted: 11/25/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Blink and masseter reflexes provide reliable, quantifiable data on the function of the central nervous system: Delayed latencies have been found in patients with neurocognitive disorder (ND) and type 2 diabetes mellitus (T2DM), but this has not been studied in patients with both pathologies.
AIM To investigate if older adults with ND plus T2DM have prolonged latencies of blink and masseter-reflex and if they were associated with disease progression.
METHODS This cross-sectional study included 227 older adults (> 60 years) from Colima, Mexico. Neurocognitive disorder was identified by a neuropsychological battery test, and T2DM identified by medical history, fasting glucose, and glycosylated hemoglobin. Latencies in the early reflex (R1), ipsilateral late (R2), and contralateral late (R2c) components of the blink reflex were analyzed for all subjects, and 183 subjects were analyzed for latency of the masseter reflex.
RESULTS In 20.7% of participants, ND was detected. In 37%, T2DM was detected. Latencies in R1, R2, and R2c were significantly prolonged for groups with ND plus T2DM, ND, and T2DM, compared with the control group (P < 0.0001). The masseter reflex was only prolonged in older adults (regardless of T2DM status) with ND vs controls (P = 0.030). In older adults with ND and without T2DM, the more the cognitive impairment progressed, the more prolonged latencies in R2 and R2c presented (P < 0.01).
CONCLUSION These findings suggest that blink and masseter reflexes could be used to evaluate possible changes in brainstem circuits in older adults with ND and T2DM.
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Affiliation(s)
| | - Eder Ríos-Bracamontes
- General Hospital Zone #1, Mexican Social Security Institute, Villa de Alvarez 28983, Colima, Mexico
| | - Mónica Ríos-Silva
- University Biomedical Research Center, University of Colima, Colima 28045, Colima, Mexico
- University Biomedical Research Center, CONACYT, Colima 28045, Colima, Mexico
| | - Miguel Huerta
- University Biomedical Research Center, University of Colima, Colima 28045, Colima, Mexico
| | - Walter Serrano-Moreno
- University Biomedical Research Center, University of Colima, Colima 28045, Colima, Mexico
| | | | - Genaro Gabriel Ortiz
- Department of Philosophical and Methodological Disciplines, University Health Sciences Center, University of Guadalajara, Guadalajara 44340, Jalisco, Mexico
| | | | - José Guzmán-Esquivel
- General Hospital Zone #1, Mexican Social Security Institute, Villa de Alvarez 28983, Colima, Mexico
| | - Xóchitl Trujillo
- University Biomedical Research Center, University of Colima, Colima 28045, Colima, Mexico
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Ramanan D, Palla S, Bennani H, Polonowita A, Farella M. Oral behaviours and wake-time masseter activity in patients with masticatory muscle pain. J Oral Rehabil 2021; 48:979-988. [PMID: 34185872 DOI: 10.1111/joor.13219] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 06/06/2021] [Accepted: 06/24/2021] [Indexed: 12/26/2022]
Abstract
BACKGROUND Little is known about wake-time masseter activity of patients with masticatory muscle pain in real-life settings. OBJECTIVES The aims of this study were (1) to assess wake-time masseter activity of women with masticatory muscle pain (MMP) and compare it with that of pain-free women; and (2) to investigate the association between objectively measured masseter contractions and self-reported oral behaviours. METHODS Adult women (N = 27) diagnosed with MMP were age-matched with pain-free women (N = 26). The electromyographic (EMG) activity of the masseter muscle when awake was recorded unilaterally for two consecutive days. The number of contraction episodes and relative contraction time (%) were calculated using cut-off thresholds of 3%, 5% and 10% of maximum voluntary contraction (MVC). Self-reported daytime oral activity was assessed using the Oral Behaviours Checklist (OBC, items 3-21). Data were analysed using univariate tests and mixed-model analyses. RESULTS The number of contraction episodes was similar between groups for all detection thresholds, but the relative contraction time at the lower detection thresholds (i.e. 3% MVC and 5% MVC) was significantly longer (1.5-fold) in the MMP than in the pain-free group. The OBC scores were significantly higher in the women with MMP than in controls, but no positive association could be found between EMG variables and OBC scores. CONCLUSION Women with MMP engage in low-level masseter muscle contractions, which last longer than those of pain-free controls. There was no relationship between self-reported oral behaviours and masseter activity when awake. These findings support the notion that prolonged low-level clenching when awake may play a role in the pathophysiology of MMP.
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Affiliation(s)
- D Ramanan
- Discipline of Orthodontics, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand
| | - S Palla
- University of Zurich, Zurich, Switzerland
| | - H Bennani
- Discipline of Orthodontics, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand
| | - A Polonowita
- Discipline of Oral Medicine, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand
| | - M Farella
- Discipline of Orthodontics, Sir John Walsh Research Institute, University of Otago, Dunedin, New Zealand.,Department of Surgical Sciences, University of Cagliari, Cagliari, Italy
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12
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Isidro R, Cioffi I. Sex Differences in the Temporalis Tendon-Aponeurotic Complex: An in vivo MRI Macroscopic Analysis in Children and Adolescents. Cells Tissues Organs 2021; 210:24-30. [PMID: 34091450 DOI: 10.1159/000516193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 03/21/2021] [Indexed: 11/19/2022] Open
Abstract
The tendon-aponeurosis complex (TAC) of the temporalis dissipates forces produced during function. Abnormally reduced temporalis TACs have been found in individuals with chronic muscular temporomandibular disorders - a painful musculoskeletal condition that is more frequent in women than men. Whether there are sex differences in the temporalis TAC in healthy individuals is currently unknown. Here, we characterized and measured the temporalis TAC in healthy male and female young individuals between 5 and 15 years old to determine whether the volume of the temporalis TAC and the TAC-to-muscle ratio are different between males and females. We collected MRI studies from 90 healthy individuals, including equal numbers (15 M and 15 F) of young children (ages 5-7), children (9-11), and adolescents (13-15) and segmented the right temporalis and its TAC using software. Using general linear models, we tested the effect of sex, age, and their interaction on the volumes of the temporalis and its TAC, and the TAC-to-muscle ratio. The volumes of the temporalis and its TAC increased with age (both p < 0.001) and were not affected by sex (p = 0.252 and p = 0.179) or by the interaction sex-by-age (p = 0.079 and p = 0.095, respectively). The TAC-to-muscle ratio did not change significantly with age (p = 0.655) and was not affected by sex (0.438) or by the interaction sex-by-age (0.524). We provide, for the first time, volumetric data of the temporalis TAC in children and adolescents. The volumes of the temporalis TAC and the TAC-to-muscle ratio are not different between male and female individuals until the age of 15.
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Affiliation(s)
- Rachelle Isidro
- Centre for Multimodal Sensorimotor and Pain Research, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
| | - Iacopo Cioffi
- Centre for Multimodal Sensorimotor and Pain Research, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.,Department of Dentistry, Mount Sinai Hospital, Toronto, Ontario, Canada
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13
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Jurt A, Lee JY, Gallo LM, Colombo V. Influence of bolus size and chewing side on temporomandibular joint intra-articular space during mastication. Med Eng Phys 2020; 86:41-46. [PMID: 33261732 DOI: 10.1016/j.medengphy.2020.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 09/29/2020] [Accepted: 10/04/2020] [Indexed: 11/17/2022]
Abstract
Previous studies suggested that, during mastication, magnitude and location of mechanical load in the temporomandibular joint (TMJ) might depend on chewing side and bolus size. Aim of this study was to dynamically measure the TMJ space while chewing on standardized boluses to assess the relationship among minimum intra-articular distances (MID), their location on the condylar surface, bolus size, and chewing side. Mandibular movements of 12 participants (6f, 24±1y.o.; 6 m, 28±6y.o.) were tracked optoelectronically while chewing unilaterally on rubber boluses of 15 × 15 × 5, 15 × 15 × 10, and 15 × 15 × 15 mm3 size. MID and their location along the main condylar axis were determined with dynamic stereometry. MID were normalized on the intra-articular distance in centric occlusion. Repeated measures ANOVA (α = 0.05) showed that MID were smaller on the balancing (0.74±0.19) than on the working condyle (0.89±0.16) independently of bolus size (p < 0.0001). MIDs did not differ between 5 and 10 mm bolus thicknesses (0.80±0.17) but increased for 15 mm (0.85±0.22, p = 0.024) and were located mostly laterally, close to the condylar center. This study confirmed higher reduction of TMJ space on the balancing than on the working condyle during mastication. Intra-articular distances increased significantly for the greatest bolus thickness. Loaded areas were located laterally, for both working and balancing joint.
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Affiliation(s)
- Alice Jurt
- Clinic of Masticatory Disorders, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Jeong-Yun Lee
- Department of Oral Medicine & Oral Diagnosis, School of Dentistry & Dental Research Institute, Seoul National University, Daehak-Ro 101, Jongno-Gu, Seoul 110-744, Republic of Korea (ROK)
| | - Luigi M Gallo
- Clinic of Masticatory Disorders, Center of Dental Medicine, University of Zurich, Zurich, Switzerland
| | - Vera Colombo
- Clinic of Masticatory Disorders, Center of Dental Medicine, University of Zurich, Zurich, Switzerland.
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14
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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]
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15
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The intensity of awake bruxism episodes is increased in individuals with high trait anxiety. Clin Oral Investig 2020; 25:3197-3206. [PMID: 33098032 DOI: 10.1007/s00784-020-03650-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 10/16/2020] [Indexed: 01/31/2023]
Abstract
OBJECTIVES Trait anxiety is associated with an increased occurrence of awake bruxism episodes, a behavior characterized by clenching of the teeth contributing to temporomandibular disorders in some individuals. Here we measured the activity of the masseter and the intensity and duration of spontaneous wake-time tooth clenching episodes in healthy individuals with different levels of trait anxiety (TA). MATERIALS AND METHODS Two hundred fifty-five individuals completed a web survey. Using their TA scores, we allocated them in low (< 20th percentile of the TA score distribution), intermediate (between 20th and 80th ), and high (> 80th) TA groups. We analyzed the electromyographic (EMG) activity of the right masseter during a 15-min silent reading task in forty-three individuals with low (n = 12), intermediate (n = 17), and high TA (n = 14). We tested between-group differences in EMG activity of the masseter, as well as postural activity-the muscular activity that maintains mandibular posture, and amplitude and duration of spontaneous tooth clenching episodes. RESULTS The activity of the masseter (mean ± SEM %maximum voluntary contraction/MVC) was greater in the high TA (10.23 ± 0.16%MVC) than the intermediate (8.49 ± 0.16%MVC) and low (7.97 ± 0.22%MVC) TA groups (all p < 0.001). Postural activity did not differ between groups (all p > 0.05). The EMG amplitude of tooth clenching episodes was greater in the high TA (19.97 ± 0.21 %MVC) than the intermediate (16.40 ± 0.24%MVC) and low (15.48 ± 0.38 %MVC) TA groups (all p < 0.05). The cumulative duration of clenching episodes was not different between groups (p = 0.390). CONCLUSIONS Increased TA is associated with both increased masseter muscle activity and intensity of wake-time tooth clenching episodes. CLINICAL RELEVANCE TA may contribute significantly to masticatory muscle overload.
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Ortún-Terrazas J, Cegoñino J, Pérez Del Palomar A. In silico study of cuspid' periodontal ligament damage under parafunctional and traumatic conditions of whole-mouth occlusions. A patient-specific evaluation. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2020; 184:105107. [PMID: 31629157 DOI: 10.1016/j.cmpb.2019.105107] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 09/28/2019] [Accepted: 10/01/2019] [Indexed: 06/10/2023]
Abstract
BACKGROUND AND OBJECTIVE Although traumatic loading has been associated with periodontal ligament (PDL) damage and therefore with several oral disorders, the damage phenomena and the traumatic loads involved are still unclear. The complex composition and extremely thin size of the PDL make experimentation difficult, requiring computational studies that consider the macroscopic loading conditions, the microscopic composition and fine detailed geometry of the tissue. In this study, a new methodology to analyse the damage phenomena in the collagen network and the extracellular matrix of the PDL caused by parafunctional and traumatic occlusal forces was proposed. METHODS The entire human mandible and a portion thereof containing a full cuspid tooth were separately modelled using finite element analysis based on computed tomography and micro-computed tomography images, respectively. The first model was experimentally validated by occlusion analysis and subjected to the muscle loads produced during hard and soft chewing, traumatic cuspid occlusion, grinding, clenching, and simultaneous grinding and clenching. The occlusal forces computed by the first model were subsequently applied to the single tooth model to evaluate damage to the collagen network and the extracellular matrix of the PDL. RESULTS Early occlusal contact on the left cuspid tooth guided the mandible to the more occluded side (16.5% greater in the right side) and absorbed most of the lateral load. The intrusive occlusal loads on the posterior teeth were 0.77-13.3% greater than those on the cuspid. According to our findings, damage to the collagen network and the extracellular matrix of the PDL could occur in traumatic and grinding conditions, mainly due to fibre overstretching (>60%) and interstitial fluid overpressure (>4.7 kPa), respectively. CONCLUSIONS Our findings provide important biomechanical insights into the determination of damage mechanisms which are caused by mechanical loading and the key role of the porous-fibrous behaviour of the PDL in parafunctional and traumatic loading scenarios. Besides, the 3D loading conditions computed from occlusal contacts will help future studies in the design of new orthodontics appliances and encourage the application of computing methods in medical practice.
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Affiliation(s)
- Javier Ortún-Terrazas
- Group of Biomaterials, Aragon Institute of Engineering Research (I3A), University of Zaragoza, Zaragoza, Spain.
| | - José Cegoñino
- Group of Biomaterials, Aragon Institute of Engineering Research (I3A), University of Zaragoza, Zaragoza, Spain
| | - Amaya Pérez Del Palomar
- Group of Biomaterials, Aragon Institute of Engineering Research (I3A), University of Zaragoza, Zaragoza, Spain
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17
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Ogawa Y, Kohyama K, Kusakabe Y. Salivation Correlates with Masseter Muscle Activity and Partially Depends on the Physical Characteristics and Volume of Food Consumed at One Time. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2020. [DOI: 10.3136/fstr.26.535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Yukino Ogawa
- Food Research Institute, National Agriculture and Food Research Organization (NARO)
| | - Kaoru Kohyama
- Food Research Institute, National Agriculture and Food Research Organization (NARO)
| | - Yuko Kusakabe
- Food Research Institute, National Agriculture and Food Research Organization (NARO)
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18
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Al Sayegh S, Borgwardt A, Svensson KG, Kumar A, Grigoriadis A, Christidis N. Effects of Chronic and Experimental Acute Masseter Pain on Precision Biting Behavior in Humans. Front Physiol 2019; 10:1369. [PMID: 31736787 PMCID: PMC6828929 DOI: 10.3389/fphys.2019.01369] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 10/15/2019] [Indexed: 01/24/2023] Open
Abstract
Chronic pain in the orofacial region is common worldwide. Pain seems to affect the jaw motor control. Hence, temporomandibular disorders (TMD) are often accompanied by pain upon chewing, restricted mouth opening and impaired maximal bite forces. However, little is known on the effects of pain, in particular the effects of chronic jaw muscle pain on precision biting. The aim of the study was to investigate the effect of chronic and acute jaw muscle pain on oral motor control during precision biting in humans. Eighteen patients with chronic masseter muscle pain and 18 healthy participants completed the experiment. All participants were examined according to the Diagnostic Criteria for TMD. Experimental acute pain was induced by bilateral, simultaneous sterile hypertonic saline infusions into the healthy masseter muscles. A standardized hold and split biting task was used to assess the precision biting. The data was analyzed with non-parametric statistical tests. The results showed no significant differences in the hold forces, split forces, durations of split or peak split rates within or between the pain and pain-free conditions. The mean split rate increased significantly compared to baseline values both in the chronic patients and the pain-free condition. However, this increase was not evident in the experimental acute pain condition. Further, there were no significant differences in the mean split rates between the conditions. The data suggest that jaw muscle pain does not seem to alter precision biting in humans, however, the possibility that a nociceptive modulation of spindle afferent activity might have occurred but compensated for cannot be ruled out.
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Affiliation(s)
- Samaa Al Sayegh
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden.,Scandinavian Center for Orofacial Neurosciences, Huddinge, Sweden
| | - Annie Borgwardt
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden
| | | | - Abhishek Kumar
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden.,Scandinavian Center for Orofacial Neurosciences, Huddinge, Sweden
| | - Anastasios Grigoriadis
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden.,Scandinavian Center for Orofacial Neurosciences, Huddinge, Sweden
| | - Nikolaos Christidis
- Division of Oral Diagnostics and Rehabilitation, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden.,Scandinavian Center for Orofacial Neurosciences, Huddinge, Sweden
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19
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Österlund C, Nilsson E, Hellström F, Häger CK, Häggman-Henrikson B. Jaw-neck movement integration in 6-year-old children differs from that of adults. J Oral Rehabil 2019; 47:27-35. [PMID: 31357241 DOI: 10.1111/joor.12865] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 07/03/2019] [Accepted: 07/18/2019] [Indexed: 11/27/2022]
Abstract
BACKGROUND A functional integration between the jaw and neck regions during purposive jaw movements is well described in adults, but there is a lack of knowledge of such integration during jaw function in children. OBJECTIVES To determine the movement integration between the jaw and neck during jaw motor tasks in 6-year-olds, whether there is a difference between children and adults. METHODS Jaw and neck movements were recorded with an optoelectronic 3D system in 25 healthy 6-year-olds (12 girls, 13 boys) and 24 healthy adults (12 women, 12 men) during paced jaw opening-closing and self-paced gum chewing. Jaw and neck movement amplitudes, intra-individual variation in movement amplitude, ratio between neck-jaw movement amplitudes and movement cycle time were analysed. Differences between children and adults were evaluated with Mann-Whitney U test for independent samples. RESULTS Compared to adults, 6-year-old children showed larger neck movement amplitudes (P = .008) during chewing, higher intra-individual variability in amplitudes of jaw (P = .008) and neck (P = .001) movements, higher ratio between neck-jaw movement amplitudes for jaw opening-closing (P = .026) and chewing (P = .003), and longer jaw movement cycle time (P ≤ .0001) during the jaw opening-closing task. CONCLUSION Despite integrated jaw-neck movements in 6-year-old children, the movement pattern differs from that of adults and may be interpreted as an immature programming of jaw-neck motor behaviour. The well-integrated movements observed in adults most likely develop over years, perhaps into adolescence, and needs further research including well-controlled longitudinal studies to map this development in order to provide appropriate age-related clinical treatment for functional disorders.
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Affiliation(s)
- Catharina Österlund
- Department of Odontology, Clinical Oral Physiology, Faculty of Medicine, University of Umeå, Umeå, Sweden
| | - Evelina Nilsson
- Department of Odontology, Clinical Oral Physiology, Faculty of Medicine, University of Umeå, Umeå, Sweden
| | - Fredrik Hellström
- Department of Occupational and Public Health Sciences, Faculty of Health and Occupational Studies, Centre for Musculoskeletal Research, University of Gävle, Gävle, Sweden
| | - Charlotte K Häger
- Department of Community Medicine and Rehabilitation, Faculty of Medicine, University of Umeå, Umeå, Sweden
| | - Birgitta Häggman-Henrikson
- Department of Orofacial Pain and Jaw Function, Faculty of Odontology, University of Malmö, Malmö, Sweden.,Scandinavian Center for Orofacial Neurosciences (SCON), Malmö, Sweden
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20
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Valentino R, Cioffi I, Vollaro S, Cimino R, Baiano R, Michelotti A. Jaw muscle activity patterns in women with chronic TMD myalgia during standardized clenching and chewing tasks. Cranio 2019; 39:157-163. [DOI: 10.1080/08869634.2019.1589703] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Roberta Valentino
- Department of Neuroscience, Reproductive Sciences and Oral Sciences, University of Naples “Federico II”, Naples, Italy
| | - Iacopo Cioffi
- Faculty of Dentistry, University of Toronto Centre for the study of Pain, Toronto, ON, Canada
| | - Stefano Vollaro
- Department of Neuroscience, Reproductive Sciences and Oral Sciences, University of Naples “Federico II”, Naples, Italy
| | - Roberta Cimino
- Department of Neuroscience, Reproductive Sciences and Oral Sciences, University of Naples “Federico II”, Naples, Italy
| | - Roberta Baiano
- Department of Neuroscience, Reproductive Sciences and Oral Sciences, University of Naples “Federico II”, Naples, Italy
| | - Ambrosina Michelotti
- Department of Neuroscience, Reproductive Sciences and Oral Sciences, University of Naples “Federico II”, Naples, Italy
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21
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Wojczyńska A, Gallo L, Bredell M, Leiggener C. Alterations of mandibular movement patterns after total joint replacement: a case series of long-term outcomes in patients with total alloplastic temporomandibular joint reconstructions. Int J Oral Maxillofac Surg 2019; 48:225-232. [DOI: 10.1016/j.ijom.2018.06.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Revised: 03/30/2018] [Accepted: 06/12/2018] [Indexed: 10/28/2022]
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22
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Smartphone-assisted monitoring of masticatory muscle activity in freely moving individuals. Clin Oral Investig 2019; 23:3601-3611. [DOI: 10.1007/s00784-018-2785-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 12/18/2018] [Indexed: 10/27/2022]
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23
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Stróżyk P, Bałchanowski J. Modelling of the forces acting on the human stomatognathic system during dynamic symmetric incisal biting of foodstuffs. J Biomech 2018; 79:58-66. [PMID: 30173934 DOI: 10.1016/j.jbiomech.2018.07.046] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 07/31/2018] [Accepted: 07/31/2018] [Indexed: 10/28/2022]
Abstract
A major stage in the preparation of a computational model of the human stomatognathic system is the determination of the values of the forces for the adopted loading configuration. In physiological conditions, food is a factor having a significant effect on the values of the loads acting on the stomatognathic system. Considering that the act of mastication is a complex process, this research undertook to determine the forces (bite forces, muscular forces and temporomandibular joint reaction forces) acting on the stomatognathic system during the dynamic symmetric incisal biting of selected foodstuffs. The investigations were divided into two stages: (1) experimental tests and (2) numerical simulations. In the first stage, classic force-displacement characteristic curves (Fi-Δh) were determined for the food while in the second stage, the curves were used as a dynamic stomatognathic system model load function. One of the most important results of this research is that the food characteristic in the form of a force-displacement function has been shown to have a significant effect not only on the values of the muscular forces and the temporomandibular joint reaction forces, but also on their curves during the dynamic loading of the stomatognathic system. The analysis of the results indicates that Fi-Δh has an effect on not only the (active and passive) forces, but also on other parameters, such as stress, deformation, displacement, and probably the rigidity of the muscles.
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Affiliation(s)
- Przemysław Stróżyk
- Department of Materials Science, Strength and Welding Engineering, Faculty of Mechanical Engineering, Wrocław University of Science and Technology, Łukasiewicza 5, 50-371 Wrocław, Poland.
| | - Jacek Bałchanowski
- Department of Biomedical Engineering, Mechatronics and Theory of Mechanisms, Faculty of Mechanical Engineering, Wrocław University of Science and Technology, Łukasiewicza 5, 50-371 Wrocław, Poland.
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24
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ElectromyoFigureic Evaluation of Functional Adaptation of Patients with New Complete Dentures. Int J Dent 2018; 2018:2412084. [PMID: 29713345 PMCID: PMC5866849 DOI: 10.1155/2018/2412084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2017] [Revised: 11/29/2017] [Accepted: 12/19/2017] [Indexed: 11/17/2022] Open
Abstract
Objective The objective of this study was to evaluate the level of adaptation of patients to newly fitted complete dentures in their dominant and nondominant sides, by means of ElectromyoFigureic signals. Materials and Methods Eighty-eight patients with complete dentures were evaluated in the study. Masticatory muscle (masseter and temporal) bioelectric activity of the patients with complete dentures was recorded at maximum intercuspal relation. Parametric statistical data were analyzed with one-way repeated measures ANOVA test. Results Measurement time was significantly different for both dominant (DS) and nondominant (NDS) sides: FΣs-DS = 21.51, p=0.0001; FΣs-NDS = 13.25, p=0.0001. Gender was also significantly different: FΣs-DS-gender = 41.53, p=0.001; FΣs-NDS-gender = 85.76, p=0.0001. The average surface area values showed significant difference in females. Prior experience with dentures showed no significant difference for both sides of mastication: FΣs-DS-experiences = 1.83, p=0.1772; F Σs-NDS-experiences = 3.30, p=0.0697. Conclusion The planimetric indicators of bioelectric activity of masseter and temporalis muscles at maximum physiological loading conditions are significant discriminators of the level of functional adaptation of patients with new complete dentures.
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Khawaja SN, McCall W, Dunford R, Nickel JC, Iwasaki LR, Crow HC, Gonzalez Y. Infield masticatory muscle activity in subjects with pain-related temporomandibular disorders diagnoses. Orthod Craniofac Res 2016; 18 Suppl 1:137-45. [PMID: 25865542 DOI: 10.1111/ocr.12077] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/17/2014] [Indexed: 01/11/2023]
Abstract
OBJECTIVES Pain-related temporomandibular disorders (TMDs) are the most prevalent conditions among TMDs. There is contrasting evidence available for association of pain-related TMD and masticatory muscle activity (MMA). The present investigation assesses the associations between MMA levels of masseter and temporalis muscles during awake and sleep among pain-related TMD diagnostic groups. SETTING AND SAMPLE POPULATION The department of Oral Diagnostic Sciences, University at Buffalo. Twenty females and six males participated in this study. MATERIAL AND METHODS Using the diagnostic criteria for temporomandibular disorders (DC-TMDs), participants were diagnostically categorized. Subjects used a custom monitoring system, which recorded infield muscle activities. A factorial model tested for association between independent variable (muscle, time period, MMA level, and diagnostic group) effects and the logarithm of MMA. Greenhouse-Geisser test was used to determine any statistically significant associations (p≤0.003). RESULTS No statistically significant association was found between four-way, three-way, and two-way analyses. However, among the main effects, range of magnitudes was the only variable to be statistically significant. Although the data suggest a trend of increased masseter MMA in the pain-related TMD diagnoses group both during awake and sleep time periods, such observation is not maintained for the temporalis muscle. In addition, temporalis MMA was found to be higher in the pain-related TMD diagnoses group only at extreme activity levels (<25 and ≥80% ranges). CONCLUSION This data support the association between masticatory muscle hyperactivity and painful TMD conditions.
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Affiliation(s)
- S N Khawaja
- Oral Diagnostic Sciences, University at Buffalo, Buffalo, NY, USA
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26
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Reynolds AK, Nickel JC, Liu Y, Leeper DK, Riffel KM, Liu H, Iwasaki LR. Sex differences in jaw muscle duty factors during exercise in two environments: A pilot study. J Electromyogr Kinesiol 2016; 30:15-22. [PMID: 27236045 DOI: 10.1016/j.jelekin.2016.05.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 04/28/2016] [Accepted: 05/13/2016] [Indexed: 11/17/2022] Open
Abstract
It is unknown if females and males use jaw muscles similarly during exercise. This pilot study assessed jaw elevator muscle duty factors (DFs=time of muscle activity/total recording time) at repeated sessions to test if DFs are reliable and different between sexes during exercises in two environments. Ten female and seven male subjects recruited from university soccer teams provided informed consent. Surface electromyography was recorded from masseter and temporalis muscles during biting and leg-extension laboratory exercises. Average activities to produce 20N bite-forces for each muscle and subject determined thresholds (5-80%·T20N) for subject-specific DF calculations during exercises performed in laboratory and natural environments. Subjects self-recorded via portable electromyography equipment during in-field leg-extension and weight-lifting exercises. Effects of variables on DFs were assessed via ANOVA (α=0.05) and simple effects testing (Bonferroni-adjusted p⩽0.012). All subjects used jaw muscles during exercises in both environments. DFs between laboratory sessions were reliable (R=0.84). During laboratory exercises, male temporalis DFs were significantly higher than female DFs from both muscles (p⩽0.001). During in-field exercises females had higher DFs during weight-lifting while males had higher DFs during leg-extensions. In-field sex differences were significant at most thresholds and showed larger effect sizes for leg-extension compared to weight-lifting exercises.
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Affiliation(s)
| | - Jeffrey C Nickel
- University of Missouri-Kansas City, School of Dentistry, Kansas City, MO, United States
| | - Ying Liu
- East Tennessee State University, College of Public Health, Johnson City, TN, United States
| | - Danielle K Leeper
- Texas A & M University, Baylor College of Dentistry, Dallas, TX, United States
| | - Kelsey M Riffel
- University of Nebraska Medical Center, College of Dentistry, Lincoln, NE, United States
| | - Hongzeng Liu
- University of Missouri-Kansas City, School of Dentistry, Kansas City, MO, United States
| | - Laura R Iwasaki
- University of Missouri-Kansas City, School of Dentistry, Kansas City, MO, United States.
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Khawaja SN, Iwasaki LR, Dunford R, Nickel JC, McCall W, Crow HC, Gonzalez Y. Association of Masseter Muscle Activities during Awake and Sleep Periods with Self-Reported Anxiety, Depression, and Somatic Symptoms. ACTA ACUST UNITED AC 2015; 2. [PMID: 26709387 DOI: 10.15406/jdhodt.2015.02.00039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AIM AND BACKGROUND The objective of this study was to determine if duty factors (DF) of low-magnitude MMA during awake and sleep periods were associated with self-reports of anxiety, depression, and somatic symptoms, and if so, whether or not any associations were modified by gender or the presence of pain. Limited information is currently available in the literature regarding the association of low-magnitude masseter muscle activities (MMA) in habitual environmental settings and the presence of psychological symptoms. MATERIALS AND METHODS Sixty-eight consenting participants were classified using the Diagnostic Criteria for Temporomandibular Disorders examination and validated self-reporting psychological symptom evaluation questionnaires. Each subject also had masseter electromyography recordings during standardized biting tasks in 2 laboratory sessions to calibrate the in-field MMA collected during 3 awake and 3 sleep periods. RESULTS During awake periods, subjects with self-reported depression and somatic symptoms had statistically high odds of having higher DF of low-magnitude MMA (defined by ≥ 75th percentile of sample). The association between high DF of low-magnitude MMA and self-reported depression symptoms was significantly augmented among male participants, whereas, the association between high DF of low-magnitude MMA and self-reported somatic symptoms was significantly increased among female participants without pain. CONCLUSION These pilot data support associations of low-magnitude masseter muscle activities with self-reported depression and somatic symptoms during awake periods.
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Affiliation(s)
| | - Laura R Iwasaki
- Departments of Orthodontics & Dentofacial Orthopedics and Oral & Craniofacial Sciences, University of Missouri-Kansas City, USA
| | | | - Jeffrey C Nickel
- Departments of Orthodontics & Dentofacial Orthopedics and Oral & Craniofacial Sciences, University of Missouri-Kansas City, USA
| | | | - Heidi C Crow
- Oral Diagnostic Sciences, University at Buffalo, USA
| | - Yoly Gonzalez
- Oral Diagnostic Sciences, University at Buffalo, USA
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Santana-Mora U, Martínez-Ínsua A, Santana-Penín U, del Palomar AP, Banzo JC, Mora MJ. Muscular activity during isometric incisal biting. J Biomech 2014; 47:3891-7. [DOI: 10.1016/j.jbiomech.2014.09.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 08/29/2014] [Accepted: 09/06/2014] [Indexed: 11/30/2022]
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Johansson AS, Westberg KG, Edin BB. Task-dependent control of the jaw during food splitting in humans. J Neurophysiol 2014; 111:2614-23. [PMID: 24671539 DOI: 10.1152/jn.00797.2013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Although splitting of food items between the incisors often requires high bite forces, rarely do the teeth harmfully collide when the jaw quickly closes after split. Previous studies indicate that the force-velocity relationship of the jaw closing muscles principally explains the prompt dissipation of jaw closing force. Here, we asked whether people could regulate the dissipation of jaw closing force during food splitting. We hypothesized that such regulation might be implemented via differential recruitment of masseter muscle portions situated along the anteroposterior axis because these portions will experience a different shortening velocity during jaw closure. Study participants performed two different tasks when holding a peanut-half stacked on a chocolate piece between their incisors. In one task, they were asked to split the peanut-half only (single-split trials) and, in the other, to split both the peanut and the chocolate in one action (double-split trials). In double-split trials following the peanut split, the intensity of the tooth impact on the chocolate piece was on average 2.5 times greater than in single-split trials, indicating a substantially greater loss of jaw closing force in the single-split trials. We conclude that control of jaw closing force dissipation following food splitting depends on task demands. Consistent with our hypothesis, converging neurophysiological and morphometric data indicated that this control involved a differential activation of the jaw closing masseter muscle along the anteroposterior axis. These latter findings suggest that the regulation of jaw closing force after sudden unloading of the jaw exploits masseter muscle compartmentalization.
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Affiliation(s)
- Anders S Johansson
- Department of Integrative Medical Biology, Physiology Section, Umeå University, Umeå, Sweden
| | - Karl-Gunnar Westberg
- Department of Integrative Medical Biology, Physiology Section, Umeå University, Umeå, Sweden
| | - Benoni B Edin
- Department of Integrative Medical Biology, Physiology Section, Umeå University, Umeå, Sweden
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Ng D, McNee C, Kieser J, Farella M. Neck and shoulder muscle activity during standardized work-related postural tasks. APPLIED ERGONOMICS 2014; 45:556-563. [PMID: 23972454 DOI: 10.1016/j.apergo.2013.07.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2012] [Revised: 07/25/2013] [Accepted: 07/26/2013] [Indexed: 06/02/2023]
Abstract
The aim of the present study was to assess the activity levels of the sternocleidomastoid muscle and upper trapezius muscle during static postures under controlled and standardized conditions, and to determine whether the muscle activity differed between sexes. Electromyographic (EMG) activity was recorded unilaterally from the sternocleidomastoid and upper trapezius muscle in 17 participants whilst they were performing various postural tasks. EMG amplitude was measured by the root mean square values of the raw signals and normalized to peak maximum contractile values for each muscle (%MVC). The intensity of muscle activity was ranked as light (<3%MVC), moderate (3%MVC ≤ EMG ≤ 8%MVC), and substantial (>8%MVC). During most tasks the two muscles contracted light to moderately. Head leaning and shoulder shrugging postures yielded substantial muscle activity in both muscles. Muscle activity did not differ significantly between male and female participants (F = 3.1; p = 0.078). Our findings provided normative values, which will enhance future studies of muscle activity during work in a natural, unrestrained environment.
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Affiliation(s)
- D Ng
- Discipline of Orthodontics, Department of Oral Science and Sir John Walsh Research Institute, University of Otago, PO Box 647, Dunedin 9054, New Zealand.
| | - C McNee
- Discipline of Orthodontics, Department of Oral Science and Sir John Walsh Research Institute, University of Otago, PO Box 647, Dunedin 9054, New Zealand
| | - J Kieser
- Discipline of Orthodontics, Department of Oral Science and Sir John Walsh Research Institute, University of Otago, PO Box 647, Dunedin 9054, New Zealand
| | - M Farella
- Discipline of Orthodontics, Department of Oral Science and Sir John Walsh Research Institute, University of Otago, PO Box 647, Dunedin 9054, New Zealand
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D'Amico JM, Yavuz ŞU, Saraçoglu A, Atiş ES, Gorassini MA, Türker KS. Activation properties of trigeminal motoneurons in participants with and without bruxism. J Neurophysiol 2013; 110:2863-72. [PMID: 24068753 DOI: 10.1152/jn.00536.2013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In animals, sodium- and calcium-mediated persistent inward currents (PICs), which produce long-lasting periods of depolarization under conditions of low synaptic drive, can be activated in trigeminal motoneurons following the application of the monoamine serotonin. Here we examined if PICs are activated in human trigeminal motoneurons during voluntary contractions and under physiological levels of monoaminergic drive (e.g., serotonin and norepinephrine) using a paired motor unit analysis technique. We also examined if PICs activated during voluntary contractions are larger in participants who demonstrate involuntary chewing during sleep (bruxism), which is accompanied by periods of high monoaminergic drive. In control participants, during a slowly increasing and then decreasing isometric contraction, the firing rate of an earlier-recruited masseter motor unit, which served as a measure of synaptic input to a later-recruited test unit, was consistently lower during derecruitment of the test unit compared with at recruitment (ΔF = 4.6 ± 1.5 imp/s). The ΔF, therefore, is a measure of the reduction in synaptic input needed to counteract the depolarization from the PIC to provide an indirect estimate of PIC amplitude. The range of ΔF values measured in the bruxer participants during similar voluntary contractions was the same as in controls, suggesting that abnormally high levels of monoaminergic drive are not continually present in the absence of involuntary motor activity. We also observed a consistent "onion skin effect" during the moderately sized contractions (<20% of maximal), whereby the firing rate of higher threshold motor units discharged at slower rates (by 4-7 imp/s) compared with motor units with relatively lower thresholds. The presence of lower firing rates in the more fatigue-prone, higher threshold trigeminal motoneurons, in addition to the activation of PICs, likely facilitates the activation of the masseter muscle during motor activities such as eating, nonnutritive chewing, clenching, and yawning.
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Affiliation(s)
- Jessica M D'Amico
- Department of Biomedical Engineering, Centre for Neuroscience, University of Alberta, Canada
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Häggman-Henrikson B, Nordh E, Eriksson PO. Increased sternocleidomastoid, but not trapezius, muscle activity in response to increased chewing load. Eur J Oral Sci 2013; 121:443-9. [DOI: 10.1111/eos.12066] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/19/2013] [Indexed: 11/28/2022]
Affiliation(s)
| | - Erik Nordh
- Department of Clinical Neurosciences; Clinical Neurophysiology; Umeå University; Umeå; Sweden
| | - Per-Olof Eriksson
- Department of Odontology; Clinical Oral Physiology; Umeå University; Umeå; Sweden
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Firing duration of masseter motor units during prolonged low-level contractions. Clin Neurophysiol 2011; 122:2433-40. [DOI: 10.1016/j.clinph.2011.05.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2010] [Revised: 05/13/2011] [Accepted: 05/14/2011] [Indexed: 11/20/2022]
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Cioffi I, Gallo LM, Palla S, Erni S, Farella M. Macroscopic Analysis of Human Masseter Compartments Assessed by Magnetic Resonance Imaging. Cells Tissues Organs 2011; 195:465-72. [DOI: 10.1159/000329503] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/17/2011] [Indexed: 12/18/2022] Open
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Araújo Pernambuco LD, Silva HJD, Lima LMD, Cunha RAD, Santos VDS, Cunha DAD, Leão JC. Atividade elétrica do músculo masseter durante a deglutição de líquido em adultos jovens. ACTA ACUST UNITED AC 2011. [DOI: 10.1590/s2179-64912011000300006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
OBJETIVO: Caracterizar a atividade elétrica muscular do masseter durante a deglutição de líquido em indivíduos adultos jovens saudáveis. MÉTODOS: A população constou de 14 voluntários considerados saudáveis seguindo os critérios de inclusão e exclusão estabelecidos para esta pesquisa. Foi realizada avaliação eletromiográfica do músculo masseter bilateralmente, durante o repouso e nas tarefas de deglutição de 14,5 ml, 20 ml e 100 ml de líquido. O sinal eletromiográfico foi normalizado pela máxima atividade voluntária resistida (MAVR), considerada como 100% de atividade elétrica muscular. RESULTADOS: No masseter direito, a maior média percentual foi encontrada na tarefa de deglutição de 20 ml e no masseter esquerdo na tarefa de 14,5 ml. No masseter direito ocorreu diferença entre as deglutições de 14,5 ml e 20 ml. No masseter esquerdo não houve diferença entre as tarefas de deglutição. CONCLUSÃO: A atividade elétrica muscular do masseter em adultos jovens saudáveis durante a deglutição de líquido pode ser influenciada pelo volume deglutido e apresenta diferentes respostas bilateralmente.
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Influence of bite force on jaw muscle activity ratios in subject-controlled unilateral isometric biting. J Electromyogr Kinesiol 2010; 20:961-6. [DOI: 10.1016/j.jelekin.2010.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Revised: 03/03/2010] [Accepted: 03/24/2010] [Indexed: 11/24/2022] Open
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Farella M, Palla S, Gallo LM. Time-frequency analysis of rhythmic masticatory muscle activity. Muscle Nerve 2009; 39:828-36. [DOI: 10.1002/mus.21262] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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