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Yap AU, Lei J, Park JW, Liu C, Kim SH, Lee BM, Fu KY. Age distribution of East Asian TMD patients and age-related differences in DC/TMD axis I findings. Cranio 2024:1-10. [PMID: 38369853 DOI: 10.1080/08869634.2024.2316081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
OBJECTIVES The pattern of age distribution in East Asian temporomandibular disorder (TMD) patients and age-related differences in DC/TMD diagnostic subtypes/categories were evaluated. SUBJECTS AND METHODS TMD patients from two University-based centers in China and South Korea were enrolled. Axis I physical diagnoses were rendered according to DC/TMD. Patients were categorized into six age groups (15-24, 25-34, 35-44, 45-54, 55-64, and 65-84 years; Groups A-F respectively). RESULTS Youths/young adults (Groups A-C) formed 74.1% of TMD patients. TMJ disc displacements (74.9%), arthralgia (49.2%), and degenerative joint disease [DJD] (36.8%) were the most common TMD subtypes. The majority had combined (54.0%) and chronic (58.5%) TMDs. Youths/young adults and middle-aged/old adults had substantially lower frequencies of merely pain-related (6.2-14.5%) and intra-articular (13.8-16.8%) TMDs correspondingly. "Being female" increased the prospects of pain-related/combined TMDs by 96%/49%, respectively. CONCLUSIONS East Asian TMD patients comprised mostly of youths/young adults who had an alarmingly high prevalence of TMJ DJD.
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Affiliation(s)
- Adrian Ujin Yap
- Center for TMD & Orofacial Pain, Peking University School & Hospital of Stomatology, Beijing, China
- Department of Dentistry, Ng Teng Fong General Hospital and Faculty of Dentistry, National University Health System, Singapore, Singapore
- National Dental Research Institute Singapore, National Dental Centre Singapore and Duke-NUS Medical School, Singapore Health Services, Singapore, Singapore
| | - Jie Lei
- Center for TMD & Orofacial Pain, Peking University School & Hospital of Stomatology, Beijing, China
- National Center for Stomatology and National Clinical Research Center for Oral Diseases, Beijing, China
- National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Ji Woon Park
- Dental Research Institute, Seoul National University, Seoul, Korea
- Department of Dental Biomaterials Science, Seoul National University School of Dentistry, Seoul, Korea
- Department of Oral Medicine, Seoul National University Dental Hospital, Seoul, Korea
| | - Chengge Liu
- Center for TMD & Orofacial Pain, Peking University School & Hospital of Stomatology, Beijing, China
- National Center for Stomatology and National Clinical Research Center for Oral Diseases, Beijing, China
- National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
| | - Seong Hae Kim
- Department of Oral Medicine, Seoul National University Dental Hospital, Seoul, Korea
- Department of Oral Medicine & Oral Diagnosis, Seoul National University School of Dentistry, Seoul, Korea
| | - Byeong-Min Lee
- Dental Research Institute, Seoul National University, Seoul, Korea
| | - Kai-Yuan Fu
- Center for TMD & Orofacial Pain, Peking University School & Hospital of Stomatology, Beijing, China
- National Center for Stomatology and National Clinical Research Center for Oral Diseases, Beijing, China
- National Engineering Research Center of Oral Biomaterials and Digital Medical Devices, Beijing, China
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Barjandi G, Svedenlöf J, Jasim H, Collin M, Hedenberg-Magnusson B, Christidis N, Ernberg M. Clinical aspects of mastication myalgia-an overview. Front Pain Res (Lausanne) 2024; 4:1306475. [PMID: 38264542 PMCID: PMC10803665 DOI: 10.3389/fpain.2023.1306475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 12/26/2023] [Indexed: 01/25/2024] Open
Abstract
Mastication myalgia is the most common cause of non-odontogenic pain in the orofacial region and is often associated with a reduced quality of life. The purpose of this review is to provide an overview of the clinical aspects of myalgia based on available research. The review includes epidemiological, diagnostic, and etiological aspects. In addition, the potential risk factors related to the transition from acute to chronic myalgia are explored and treatment strategies are presented for its management. As a result, this review may increase clinical knowledge about mastication myalgia and clarify strategies regarding prevention, diagnostics, and management to improve prognosis and reduce patient suffering.
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Affiliation(s)
- Golnaz Barjandi
- Department of Dental Medicine, Karolinska Institutet, and the Scandinavian Center for Orofacial Neuroscience (SCON), Huddinge, Sweden
| | - Johanna Svedenlöf
- Department of Dental Medicine, Karolinska Institutet, and the Scandinavian Center for Orofacial Neuroscience (SCON), Huddinge, Sweden
| | - Hajer Jasim
- Department of Dental Medicine, Karolinska Institutet, and the Scandinavian Center for Orofacial Neuroscience (SCON), Huddinge, Sweden
- Department of Orofacial Pain and Jaw Function, Eastman Institute, Stockholm, Sweden
| | - Malin Collin
- Department of Dental Medicine, Karolinska Institutet, and the Scandinavian Center for Orofacial Neuroscience (SCON), Huddinge, Sweden
| | - Britt Hedenberg-Magnusson
- Department of Dental Medicine, Karolinska Institutet, and the Scandinavian Center for Orofacial Neuroscience (SCON), Huddinge, Sweden
- Department of Orofacial Pain and Jaw Function, Eastman Institute, Stockholm, Sweden
| | - Nikolaos Christidis
- Department of Dental Medicine, Karolinska Institutet, and the Scandinavian Center for Orofacial Neuroscience (SCON), Huddinge, Sweden
| | - Malin Ernberg
- Department of Dental Medicine, Karolinska Institutet, and the Scandinavian Center for Orofacial Neuroscience (SCON), Huddinge, Sweden
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3
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Congiusta MC, Snyder C, Soukup JW, Apostolopoulos N. Novel Management of Masticatory Myositis in Three Dogs with a Selective Janus Kinase (JAK-1) Inhibitor. J Vet Dent 2024:8987564231219925. [PMID: 38192103 DOI: 10.1177/08987564231219925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
Masticatory myositis (MM) is an inflammatory myopathy reported in dogs and is characterized by inflammation of the masticatory muscles (temporalis, masseter, and pterygoid muscles). Immunosuppressive therapy is the current recommended treatment for MM and may involve glucocorticoids, cyclosporine, azathioprine, mycophenolate mofetil, leflunomide, or a combination of these treatments that are slowly tapered to the lowest effective dose. However, side effects from multimodal medical therapy and complications associated with MM relapses have been reported. The purpose of this case series was to report oclacitinib as a treatment alternative to traditional medical management of MM. The intent of this alternative is to manage side effects from glucocorticoid use. Oclacitinib (1mg/kg per os q12h) was used solely for treatment of MM in three dogs. The dogs were followed up to >6 months after oclacitinib administration. An increase in oral range of motion, as determined by gape angle, was noted in all three dogs. However, a corresponding drop in antibody titers (2M fiber) did not occur. All dogs showed improvement in overall clinical management of MM, side effects from glucocorticoids, and clinical signs related to chronic prednisone use. Larger controlled trials with consistent measurements (interincisal distance, gape angle) and 2M fiber antibody titers are indicated to further assess validation of oclacitinib treatment of MM. The clinical outcome of all dogs was considered successful.
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Affiliation(s)
- Michael C Congiusta
- Dentistry and Oral Surgery, Department of Surgical Sciences, School of Veterinary Medicine; University of Wisconsin-Madison, Madison, WI, USA
| | - Christopher Snyder
- Dentistry and Oral Surgery, Department of Surgical Sciences, School of Veterinary Medicine; University of Wisconsin-Madison, Madison, WI, USA
| | - Jason W Soukup
- Dentistry and Oral Surgery, Department of Surgical Sciences, School of Veterinary Medicine; University of Wisconsin-Madison, Madison, WI, USA
| | - Neoklis Apostolopoulos
- Dermatology, Department of Medical Sciences, School of Veterinary Medicine, University of Wisconsin, Madison, WI, USA
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4
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Lekroengsin B, Tachiki C, Takaki T, Nishii Y. Relationship between Changes in Condylar Morphology and Masticatory Muscle Volume after Skeletal Class II Surgery. J Clin Med 2023; 12:4875. [PMID: 37510990 PMCID: PMC10381303 DOI: 10.3390/jcm12144875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 07/20/2023] [Accepted: 07/22/2023] [Indexed: 07/30/2023] Open
Abstract
The treatment of dentofacial deformities generally includes orthognathic surgery in which mandibular condyle changes following surgery are a common cause of relapse. This study investigated the changes in the mandibular condyle and related muscles to identify the factors that affected the changes in the mandibular condyle after orthognathic surgery in skeletal class II patients. This research studied 60 joints in 30 patients with skeletal class II dentofacial deformities who received surgical orthodontic treatment, including bilateral sagittal split ramus osteotomy, and underwent computed tomography before and after orthodontic treatment. The mandibular condyle, masseter, and medial pterygoid muscles were reconstructed and measured in 3D. Condylar positional and morphology changes, masseter and medial pterygoid muscle volume, temporomandibular joint (TMJ) pain, and distal segment movement were analyzed. The study observed that both the masseter and medial pterygoid muscle volumes decreased with statistical significance. The changes in the horizontal direction were positively correlated with the amount of movement. The findings indicated that mandibular condyle changes were significantly affected by the movement of the distal segment, the medial pterygoid muscle volume, and the direction of the distal segment, which influenced the treatment's long-term stability after orthognathic surgery.
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Affiliation(s)
| | - Chie Tachiki
- Department of Orthodontics, Tokyo Dental College, Tokyo 101-0061, Japan
| | - Takashi Takaki
- Department of Oral and Maxillofacial Surgery, Tokyo Dental College, Tokyo 101-0061, Japan
| | - Yasushi Nishii
- Department of Orthodontics, Tokyo Dental College, Tokyo 101-0061, Japan
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5
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Kong L, Fang Y, Du M, Wang Y, He H, Liu Z. Gαi2 regulates the adult myogenesis of masticatory muscle satellite cells. J Cell Mol Med 2023; 27:1239-1249. [PMID: 36977201 PMCID: PMC10148056 DOI: 10.1111/jcmm.17726] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 01/22/2023] [Accepted: 03/08/2023] [Indexed: 03/30/2023] Open
Abstract
Although similar to trunk and limb skeletal muscles, masticatory muscles are believed as unique in both developmental origins and myogenesis. Gαi2 has been demonstrated to promote muscle hypertrophy and muscle satellite cell differentiation in limb muscles. However, the effect of Gαi2 on masticatory muscles is still unexplored. This study aimed to identify the role of Gαi2 in the proliferation and differentiation of masticatory muscle satellite cells, further exploring the metabolic mechanism of masticatory muscles. The proliferation rate, myotube size, fusion index of masticatory muscle satellite cells and Pax7, Myf5, MyoD, Tcf21 and Musculin expressions were significantly decreased by Gαi2 knockdown, while in cells infected with AdV4-Gαi2, the proliferation rate, myotube size, fusion index and Tbx1 expression were significantly increased. Masticatory muscle satellite cells also displayed phenotype transformation as Gαi2 changed. In addition, Gαi2 altered myosin heavy chain (MyHC) isoforms of myotubes with less MyHC-2A expression in siGαi2 group and more MyHC-slow expression in AdV4-Gαi2 group. In conclusion, Gαi2 could positively affect the adult myogenesis of masticatory muscle satellite cells and maintain the superiority of MyHC-slow. Masticatory muscle satellite cells may have their unique Gαi2-regulated myogenic transcriptional networks, although they may share some common characteristics with trunk and limb muscles.
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Affiliation(s)
- Lin Kong
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Yi Fang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
- Kunming Medical University School and Hospital of Stomatology, Kunming, China
- Yunnan Key Laboratory of Stomatology, Kunming, China
| | - Mingyuan Du
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
- Department of Orthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Yunlong Wang
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
- Department of Orthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Hong He
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
- Department of Orthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China
| | - Zhijian Liu
- The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China
- Department of Orthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China
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6
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Prasad S, Arunachalam S, Boillat T, Ghoneima A, Gandedkar N, Diar-Bakirly S. Wearable Orofacial Technology and Orthodontics. Dent J (Basel) 2023; 11:dj11010024. [PMID: 36661561 PMCID: PMC9858298 DOI: 10.3390/dj11010024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 12/19/2022] [Accepted: 12/30/2022] [Indexed: 01/12/2023] Open
Abstract
Wearable technology to augment traditional approaches are increasingly being added to the arsenals of treatment providers. Wearable technology generally refers to electronic systems, devices, or sensors that are usually worn on or are in close proximity to the human body. Wearables may be stand-alone or integrated into materials that are worn on the body. What sets medical wearables apart from other systems is their ability to collect, store, and relay information regarding an individual's current body status to other devices operating on compatible networks in naturalistic settings. The last decade has witnessed a steady increase in the use of wearables specific to the orofacial region. Applications range from supplementing diagnosis, tracking treatment progress, monitoring patient compliance, and better understanding the jaw's functional and parafunctional activities. Orofacial wearable devices may be unimodal or incorporate multiple sensing modalities. The objective data collected continuously, in real time, in naturalistic settings using these orofacial wearables provide opportunities to formulate accurate and personalized treatment strategies. In the not-too-distant future, it is anticipated that information about an individual's current oral health status may provide patient-centric personalized care to prevent, diagnose, and treat oral diseases, with wearables playing a key role. In this review, we examine the progress achieved, summarize applications of orthodontic relevance and examine the future potential of orofacial wearables.
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Affiliation(s)
- Sabarinath Prasad
- Department of Orthodontics, Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai 50505, United Arab Emirates
- Correspondence:
| | - Sivakumar Arunachalam
- Orthodontics and Dentofacial Orthopedics, School of Dentistry, International Medical University, Kuala Lumpur 57000, Malaysia
| | - Thomas Boillat
- Design Lab, College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai 50505, United Arab Emirates
| | - Ahmed Ghoneima
- Department of Orthodontics, Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai 50505, United Arab Emirates
| | - Narayan Gandedkar
- Discipline of Orthodontics & Paediatric Dentistry, School of Dentistry, University of Sydney, Sydney, NSW 2006, Australia
| | - Samira Diar-Bakirly
- Department of Orthodontics, Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai 50505, United Arab Emirates
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7
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Yamaguchi T, Mikami S, Maeda M, Saito T, Nakajima T, Yachida W, Gotouda A. Portable and wearable electromyographic devices for the assessment of sleep bruxism and awake bruxism: A literature review. Cranio 2023; 41:69-77. [PMID: 32870753 DOI: 10.1080/08869634.2020.1815392] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE The current state of portable/wearable electromyographic (EMG) devices for assessment of bruxism was reviewed. METHODS A search of full-text articles relevant to portable/wearable EMG devices capable of being used at home was performed. The data source used was MEDLINE via PubMed from January 1970 to July 2019. RESULTS There were nine kinds of wearable EMG devices capable of being used under unrestrained conditions. Ultra-miniaturized wearable EMG devices with a level of performance equivalent to that of conventional stationary EMG devices have been developed and are being used during sleep and in the daytime. The devices have a high level of diagnostic accuracy for sleep bruxism. A definite cut-off value for awake bruxism has not been established. DISCUSSION Assessment of sleep bruxism with a high level of accuracy can be performed using a portable/wearable EMG device. However, a definite cut-off value is required for assessment of awake bruxism.
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Affiliation(s)
- Taihiko Yamaguchi
- Department of Crown and Bridge Prosthodontics, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - Saki Mikami
- Department of Temporomandibular Disorders, Center for Advanced Oral Medicine, Hokkaido University Hospital, Sapporo, Japan
| | - Masana Maeda
- Department of Crown and Bridge Prosthodontics, Hokkaido University Hospital, Sapporo, Japan
| | - Taishi Saito
- Department of Crown and Bridge Prosthodontics, Graduate School of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - Toshinori Nakajima
- Department of Crown and Bridge Prosthodontics, Hokkaido University Hospital, Sapporo, Japan
| | - Wataru Yachida
- Department of Crown and Bridge Prosthodontics, Hokkaido University Hospital, Sapporo, Japan
| | - Akihito Gotouda
- Department of Temporomandibular Disorders, Center for Advanced Oral Medicine, Hokkaido University Hospital, Sapporo, Japan
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8
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Zhang X, Wang C, Zheng D, Xiao H, Zhong Q. Magnetic resonance imaging evaluation of masticatory muscle changes in patients with primary trigeminal neuralgia before microvascular decompression. Medicine (Baltimore) 2022; 101:e31010. [PMID: 36254090 PMCID: PMC9575714 DOI: 10.1097/md.0000000000031010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Primary trigeminal neuralgia (PTN) is characterized by chronic neuropathic pain. There are few studies exploring masticatory muscle changes in patients with PTN. This study evaluated the changes in the masticatory muscles using magnetic resonance imaging (MRI) and the predictive factors of masticatory muscle changes in patients with PTN. The radiologic outcomes of 52 patients with PTN and 58 healthy adults were evaluated. The temporalis, lateral pterygoid, medial pterygoid, and masseter muscles were assessed using MRI. Atrophy and edema of the masticatory muscles were noted. Multivariate analyses were conducted to identify factors associated with masticatory muscle atrophy. Among the PTN group, the right side (61.5%) and mandibular branch (53.9%) were the most affected. Muscle atrophy of the temporalis (P < .001), medial pterygoid (P = .016), lateral pterygoid (P = .031), and masseter (P = .001) were significantly higher in the PTN group than in the control group. Lateral pterygoid edema was significantly higher in the PTN group (P < .001). However, no significant difference was found in the temporalis and masseter edema between the two groups. Logistic regression analysis demonstrated that neurovascular conflict (NVC) significantly predicted mastication muscle atrophy (P = .037). Patients with PTN had higher rates of masticatory muscle atrophy and edema. The assessment of NVC may be a preoperative imaging biomarker to predict atrophy in PTN.
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Affiliation(s)
- Xiaojuan Zhang
- Fuzong Clinical Medical College of Fujian Medical University, Fuzhou, China
- Department of Radiology, 900th Hospital Logistic Support Forces of PLA, Fuzhou, China
| | - Chuandong Wang
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Department of Surgical Oncology, Fujian Provincial Hospital, Fuzhou, China
| | - Dan Zheng
- Fuzong Clinical Medical College of Fujian Medical University, Fuzhou, China
- Department of Radiology, 900th Hospital Logistic Support Forces of PLA, Fuzhou, China
| | - Hui Xiao
- Department of Radiology, 900th Hospital Logistic Support Forces of PLA, Fuzhou, China
- * Correspondence: Qun Zhong and Hui Xiao, Fuzong Clinical Medical College of Fujian Medical University and Department of Radiology, 900th Hospital Logistic Support Forces of PLA, Fuzhou 350001, China (e-mail: , )
| | - Qun Zhong
- Department of Radiology, 900th Hospital Logistic Support Forces of PLA, Fuzhou, China
- * Correspondence: Qun Zhong and Hui Xiao, Fuzong Clinical Medical College of Fujian Medical University and Department of Radiology, 900th Hospital Logistic Support Forces of PLA, Fuzhou 350001, China (e-mail: , )
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9
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Cairns BE. The contribution of autonomic mechanisms to pain in temporomandibular disorders: A narrative review. J Oral Rehabil 2022; 49:1115-1126. [PMID: 36098708 DOI: 10.1111/joor.13370] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 08/22/2022] [Accepted: 09/06/2022] [Indexed: 11/29/2022]
Abstract
BACKGROUND Temporomandibular disorders (TMD) are diagnosed based on symptom presentation and, like other functional pain disorders, often lack definitive pathology. There is a strong association between elevated stress levels and the severity of TMD-related pain, which suggests that alterations in autonomic tone may contribute to this pain condition. OBJECTIVES This narrative review examines the association between altered autonomic function and pain in TMD. METHODS Relevant articles were identified by searching PubMed and through the reference list of those studies. RESULTS TMD sufferers report an increased incidence of orthostatic hypotension. As in other chronic musculoskeletal pain conditions, TMD is associated with increased sympathetic tone, diminished baroreceptor reflex sensitivity and decreased parasympathetic tone. It remains to be determined whether ongoing pain drives these autonomic changes and/or is exacerbated by them. To examine whether increased sympathetic tone contributes to TMD-related pain through β2 adrenergic receptor activation, clinical trials with the beta blocker propranolol have been undertaken. Although evidence from small studies suggested propranolol reduced TMD-related pain, a larger clinical trial did not find a significant effect of propranolol treatment. This is consistent with human experimental pain studies that were unable to demonstrate an effect of β2 adrenergic receptor activation or inhibition on masticatory muscle pain. In preclinical models of temporomandibular joint arthritis, β2 adrenergic receptor activation appears to contribute to inflammation and nociception, whereas in masticatory muscle, α1 adrenergic receptor activation has been found to induce mechanical sensitization. Some agents used to treat TMD, such as botulinum neurotoxin A, antidepressants and α2 adrenergic receptor agonists, may interact with the autonomic nervous system as part of their analgesic mechanism. CONCLUSION Even if dysautonomia turns out to be a consequence rather than a causative factor of painful TMD, the study of its role has opened up a greater understanding of the pathogenesis of this condition.
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Affiliation(s)
- Brian E Cairns
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, Canada
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10
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Arizono-Shimada K, Hotokezaka H, Morita Y, Ino-Kondo A, Ueda-Ichinose Y, Nashiro Y, Hotokezaka Y, Yoshimi K, Kiliaridis S, Yoshida N. The effect of masseter muscle mass on the rate of experimental tooth movement in rats. J Oral Rehabil 2022; 49:1012-1019. [PMID: 35842739 DOI: 10.1111/joor.13357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 05/22/2022] [Accepted: 07/01/2022] [Indexed: 11/30/2022]
Abstract
BACKGROUND Previous clinical observational studies have suggested that orthodontic tooth movement (OTM) is related, at least partly, to the mass and/or capabilities of the masticatory muscles. OBJECTIVES Our study aimed to examine the influence of masticatory muscle mass on the OTM in an animal experimental model in which the masseter muscle was modulated by botulinum neurotoxin type A (BTX) injection. METHODS Eighteen Wistar rats were equally divided into two groups: BTX injection and control. BTX was injected bilaterally into the masseter muscles. Three days after the injection, the maxillary left first molars were orthodontically moved for 14 days. At the end of the experiment, micro-computed tomography was performed to evaluate the rate of OTM and bone morphometry. The masseter muscles were weighed and prepared for histological analyses. RESULTS The masseter muscle mass in the BTX group was less than that in the control group, and histological findings showed atrophy of muscle fibers. The rate of OTM was significantly higher in the BTX group than in the control group. Furthermore, a negative correlation was detected between masseter muscle mass and OTM in the BTX group. Bone morphometry showed no difference between the control and BTX groups. CONCLUSION Decreased masseter muscle mass was found to be closely related to an increase in the rate of OTM in rats using BTX injection to modify the masseter muscle mass. Masseter muscle mass could be a predictive factor for OTM in rats injected with BTX.
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Affiliation(s)
- Keira Arizono-Shimada
- Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Hitoshi Hotokezaka
- Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Yukiko Morita
- Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Airi Ino-Kondo
- Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Yuika Ueda-Ichinose
- Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Yukako Nashiro
- Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Yuka Hotokezaka
- Department of Clinical Oral Oncology, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | | | - Stavros Kiliaridis
- Division of Orthodontics, University Clinics of Dental Medicine, University of Geneva, Geneva.,Department of Orthodontics, Dentofacial Orthopedics, University of Bern, Bern, Switzerland
| | - Noriaki Yoshida
- Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
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11
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Nozad Mojaver Y, Tawadros P, Moura Ferreira P, Whittle T, Murray GM. Threshold variations of medial pterygoid single motor units during vertical or horizontal force tasks. J Oral Rehabil 2021; 48:1314-1326. [PMID: 34510487 DOI: 10.1111/joor.13257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 08/19/2021] [Accepted: 09/01/2021] [Indexed: 11/28/2022]
Abstract
OBJECTIVES To test the hypotheses that (a) the force thresholds at onset of medial pterygoid muscle single motor unit (SMU) activity do not decrease with an increase in the rate of force generation in standardised vertical or horizontal jaw-force tasks, and (b) there is evidence for functional heterogeneity within the medial pterygoid muscle. METHODS In 14 healthy participants, electromyographic recordings of the right medial pterygoid muscle were performed with intramuscular fine-wire electrodes during four isometric force tasks: vertical, horizontal contralateral, horizontal protrusion and horizontal ipsilateral, performed at two rates of force development (slow ramp, fast ramp). Computer tomography scans confirmed electrode location within the muscle, which was divided into medial and lateral parts. Force thresholds of onset of discriminated SMUs were compared between rates in each task; significance accepted at p < 0.05. RESULTS Of 45 SMU force thresholds studied in one or more tasks, there was no significant difference between slow and fast ramp within each force task, except slow ramp thresholds from the lateral part during the vertical force task were significantly higher than fast ramp thresholds. Reversals of recruitment order between tasks provided evidence for functional heterogeneity within the muscle. Force thresholds of the vertical tasks (range: 1-292.6 N) were mostly higher than for the horizontal tasks (range: 0.1-12.5 N). CONCLUSION The data are consistent with the proposal that the medial pterygoid muscle stabilises the jaw in the vertical plane during isometric force generation in the jaw closing, as well as horizontal directions.
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Affiliation(s)
- Yalda Nozad Mojaver
- Faculty of Medicine and Health, Sydney Dental School, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, Australia
| | - Paul Tawadros
- Faculty of Medicine and Health, Sydney Dental School, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, Australia
| | - Polyana Moura Ferreira
- Faculty of Medicine and Health, Sydney Dental School, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, Australia
| | - Terry Whittle
- Faculty of Medicine and Health, Sydney Dental School, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, Australia
| | - Greg M Murray
- Faculty of Medicine and Health, Sydney Dental School, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, Australia
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12
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Ranjbar Ekbatan M, Cairns BE. Attenuation of Sensory Transmission Through the Rat Trigeminal Ganglion by GABA Receptor Activation. Neuroscience 2021; 471:80-92. [PMID: 34311018 DOI: 10.1016/j.neuroscience.2021.07.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Revised: 07/02/2021] [Accepted: 07/17/2021] [Indexed: 11/23/2022]
Abstract
While the trigeminal ganglion is often considered a passive conduit of sensory transmission, neurons and satellite glial cells (SGCs) within it can release neurotransmitters and express neuroreceptors. Some trigeminal ganglion neurons contain the neurotransmitter γ-aminobutyric acid (GABA) and express GABA receptors. There is behavioral evidence that increased GABA levels in the trigeminal ganglion decreases nociception, while a loss of GABA receptors results in hyperalgesia, although the neural mechanisms for this remain to be investigated. In this study, the expression of GABA receptors by trigeminal ganglion neurons that innervate rat labial skin and masseter muscle was compared using immunohistochemistry. The effect of intraganglionic administration of GABA receptor agonists was investigated by single unit recording of trigeminal brainstem and ganglion neuron responses to stimulation of the labial skin and/or masseter muscle in anesthetized rats. The mean frequency of expression of GABAA and GABAB receptors by masseter and labial skin ganglion neurons was 62.5% and 92.7%, and 55.4% and 20.3%, respectively. The expression of both GABA receptors was significantly greater in skin ganglion neurons. Masticatory muscle evoked brainstem trigeminal neuron responses were significantly attenuated by intraganglionic injection of muscimol (GABAA) but not baclofen (GABAB). The mechanical sensitivity of slow and fast conducting masticatory muscle afferent fibers was decreased and increased, respectively, by intraganglionic injection of both muscimol and baclofen. Activation of GABAA receptors may exert a gating effect on sensory transmission through the trigeminal ganglion by decreasing putative nociceptive input and enhancing innocuous sensory input.
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Dalewski B, Kamińska A, Kiczmer P, Węgrzyn K, Pałka Ł, Janda K, Sobolewska E. Pressure Algometry Evaluation of Two Occlusal Splint Designs in Bruxism Management-Randomized, Controlled Clinical Trial. J Clin Med 2021; 10:jcm10112342. [PMID: 34071832 PMCID: PMC8198302 DOI: 10.3390/jcm10112342] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Revised: 05/21/2021] [Accepted: 05/24/2021] [Indexed: 12/19/2022] Open
Abstract
The aim of this pilot study was to evaluate the short-term effectiveness of two different occlusal devices and their impact on the pressure pain threshold (PPT) values among patients who reported to the Dental Prosthetics Outpatient Clinic of Pomeranian Medical University (Szczecin, Poland) and who were diagnosed with probable bruxism. Two groups were formed (A and B) to which patients were assigned randomly. Each group used a different occlusal splint for bruxism management. The occlusal appliance by Okeson, or the bimaxillary splint, was used overnight by each patient for 30 days of the study. The PPT was measured twice, at the first visit and after 30 days of using each occlusal device, with Wagner Paintest FPX 25 algometer. Bruxism was diagnosed based on data from the patient's medical history and from the physical examination. Nocturnal Bruxism Criteria according to the International Classification of Sleep Disorders (Third Edition) was used for the patient's evaluation. Results: similar pain factor (PF) reduction was observed in both the examined groups, regardless of the device used; canine guidance and no guidance were similarly effective in terms of increasing pain resilience.
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Affiliation(s)
- Bartosz Dalewski
- Department of Dental Prosthetics, Pomeranian Medical University, 70-204 Szczecin, Poland; (B.D.); (E.S.)
| | - Agata Kamińska
- Outpatient Dental Clinic, Pomeranian Medical University, 70-204 Szczecin, Poland; (A.K.); (K.W.)
| | - Paweł Kiczmer
- Department and Chair of Pathomorphology, Faculty of Medical Sciences in Zabrze, Medical University of Silesia, 40-055 Katowice, Poland;
| | - Krzysztof Węgrzyn
- Outpatient Dental Clinic, Pomeranian Medical University, 70-204 Szczecin, Poland; (A.K.); (K.W.)
| | - Łukasz Pałka
- Private Dental Practice, 68-200 Żary, Poland
- Correspondence: ; Tel.: +48-608-882-535
| | - Katarzyna Janda
- Department of Human Nutrition and Metabolomics, Pomeranian Medical University, 24 Broniewskiego Street, 71-460 Szczecin, Poland;
| | - Ewa Sobolewska
- Department of Dental Prosthetics, Pomeranian Medical University, 70-204 Szczecin, Poland; (B.D.); (E.S.)
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14
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Lee YH, Lee KM, Auh QS. MRI-Based Assessment of Masticatory Muscle Changes in TMD Patients after Whiplash Injury. J Clin Med 2021; 10:1404. [PMID: 33915742 DOI: 10.3390/jcm10071404] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 03/20/2021] [Accepted: 03/29/2021] [Indexed: 12/15/2022] Open
Abstract
Objective: to investigate the change in volume and signal in the masticatory muscles and temporomandibular joint (TMJ) of patients with temporomandibular disorder (TMD) after whiplash injury, based on magnetic resonance imaging (MRI), and to correlate them with other clinical parameters. Methods: ninety patients (64 women, 26 men; mean age: 39.36 ± 15.40 years), including 45 patients with symptoms of TMD after whiplash injury (wTMD), and 45 age- and sex-matched controls with TMD due to idiopathic causes (iTMD) were included. TMD was diagnosed using the study diagnostic criteria for TMD Axis I, and MRI findings of the TMJ and masticatory muscles were investigated. To evaluate the severity of TMD pain and muscle tenderness, we used a visual analog scale (VAS), palpation index (PI), and neck PI. Results: TMD indexes, including VAS, PI, and neck PI were significantly higher in the wTMD group. In the wTMD group, muscle tenderness was highest in the masseter muscle (71.1%), and muscle tenderness in the temporalis (60.0%), lateral pterygoid muscle (LPM) (22.2%), and medial pterygoid muscle (15.6%) was significantly more frequent than that in the iTMD group (all p < 0.05). The most noticeable structural changes in the masticatory muscles occurred in the LPM with whiplash injury. Volume (57.8% vs. 17.8%) and signal changes (42.2% vs. 15.6%) of LPM were significantly more frequent in the wTMD group than in the iTMD group. The presence of signal changes in the LPM was positively correlated with the increased VAS scores only in the wTMD group (r = 0.346, p = 0.020). The prevalence of anterior disc displacement without reduction (ADDWoR) (53.3% vs. 28.9%) and disc deformity (57.8% vs. 40.0%) were significantly higher in the wTMD group (p < 0.05). The presence of headache, sleep problems, and psychological distress was significantly higher in the wTMD group than in the iTMD group. Conclusion: abnormal MRI findings and their correlations with clinical characteristics of the wTMD group were different from those of the iTMD group. The underlying pathophysiology may differ depending on the cause of TMD, raising the need for a treatment strategy accordingly.
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15
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Fujii T, Yamaguchi S, Sung YW, Watanabe M, Hattori Y. Correlation between Changes in the Transverse Relaxation Time and Electromyographic Measurements of the Superficial Masseter and Temporal Muscles. Magn Reson Med Sci 2020; 19:268-275. [PMID: 31548479 PMCID: PMC7553813 DOI: 10.2463/mrms.tn.2019-0035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
We analyzed the correlations between the T2 shift and integrated electromyographic (iEMG) values in the masseter and temporal muscles. Six healthy adults engaged in a clenching task over two durations at various bite forces. We evaluated the mean T2 shift per voxel and assessed their correlations with iEMG using a linear mixed model. The regression coefficients were different for each muscle type, similar for the left and right sides, and decreased upon doubling duration.
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Affiliation(s)
- Tsuyoshi Fujii
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry
| | - Satoshi Yamaguchi
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry
| | - Yul-Wan Sung
- Kansei Fukushi Research Center, Tohoku Fukushi University
| | - Makoto Watanabe
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry.,Institute of Living and Environmental Sciences, Miyagi Gakuin Women's University
| | - Yoshinori Hattori
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry
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16
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Murakami M, Iijima K, Watanabe Y, Tanaka T, Iwasa Y, Edahiro A, Ohara Y, Motokawa K, Shirobe M, Hirano H. Development of a simple method to measure masseter muscle mass. Gerodontology 2020; 37:383-388. [PMID: 32662134 DOI: 10.1111/ger.12487] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 06/08/2020] [Accepted: 06/11/2020] [Indexed: 10/23/2022]
Abstract
OBJECTIVE To develop a simple method to estimate masseter muscle mass. BACKGROUND The masseter muscle is important for optimal oral function. A decrease in the masseter muscle mass may affect the oral and physical function of the whole body; therefore, it is an important entity to measure. However, to date, no easy measurement method has been developed for the same. Herein, we devised a simple method to estimate masseter muscle mass. In addition, we compared our method with magnetic resonance imaging (MRI) and skeletal muscle mass (SMM) to verify its validity. MATERIALS AND METHODS We recorded the age, sex, masseter muscle mass (by MRI), number of retained natural teeth, number of functional teeth, length and thickness of masseter muscle, and skeletal muscle mass in 53 community-dwelling elderly people (21 men and 32 women, average age 72.9 ± 4.5 years). The estimated masseter muscle mass was calculated by multiplying the length, width and thickness of the muscle. RESULTS The correlation coefficient between masseter muscle mass and estimated masseter muscle mass was r = .903; thus, a strong correlation was recognised. The correlation coefficient between the estimated masseter muscle mass and SMM was r = .279, considering age and sex. CONCLUSION We obtained substantial results using our method for estimating the masseter muscle mass and verified its validity by comparing it with masseter muscle mass measured by MRI and SMM. We believe that our proposed technique is simple and useful for estimating masseter muscle mass.
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Affiliation(s)
- Masaharu Murakami
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan.,Haradoi Hospital Department of Dentistry, Hukuoka, Japan
| | - Katsuya Iijima
- Institute of Gerontology, The University of Tokyo, Tokyo, Japan
| | - Yutaka Watanabe
- Gerodontology, Department of Oral Health Science, Faculty of Dental Medicine, Hokkaido University, Sapporo, Japan
| | - Tomoki Tanaka
- Department of Geriatric Medicine, The University of Tokyo, Tokyo, Japan
| | - Yasuyuki Iwasa
- Haradoi Hospital Department of Dentistry, Hukuoka, Japan
| | - Ayako Edahiro
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Yuki Ohara
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Keiko Motokawa
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
| | - Maki Shirobe
- Tokyo Metropolitan Institute of Gerontology, Tokyo, Japan
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17
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Nozad Mojaver Y, Tawadros PB, Moura Ferreira P, Whittle T, Murray GM. Single motor units from the medial pterygoid muscle can be active during isometric horizontal and vertical forces. J Oral Rehabil 2019; 46:998-1008. [PMID: 31206789 DOI: 10.1111/joor.12831] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 05/30/2019] [Accepted: 06/09/2019] [Indexed: 12/27/2022]
Abstract
OBJECTIVES To determine (a) whether the medial pterygoid muscle is active in an isometric vertical force task and in isometric horizontal force tasks in the contralateral, protrusion and ipsilateral directions; (b) whether the same single motor units (SMUs) could be active across different directions of isometric force generation; and (c) whether different regions of the medial pterygoid muscle exhibit different patterns of SMU activation during the generation of any one direction of isometric force. METHODS Intramuscular electromyographic (EMG) recordings were made from the right medial pterygoid muscle in 15 healthy participants during isometric force tasks: vertical and horizontal contralateral, protrusion and ipsilateral. A computed tomography scan divided the EMG recording site into a medial or lateral part in each participant. Single motor units were discriminated in each task. RESULTS Medial pterygoid SMU activity was recorded in 100% of participants for the vertical biting tasks, 86% of participants for the horizontal contralateral and horizontal protrusion tasks and 57% of the horizontal ipsilateral tasks. Of the 72 SMUs that were discriminated, 36% were active in all tasks; 18% were active only in the vertical tasks and 17% were active in the vertical, horizontal contralateral and horizontal protrusion tasks. The proportion of SMUs that was active in at least 1 horizontal task in the lateral part (33/39) was significantly higher than the proportion (21/33) in the medial part (Chi-Square, P < 0.05). CONCLUSION The data are consistent with a stabilisation role for the medial pterygoid muscle in isometric jaw forces in the vertical and horizontal planes.
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Affiliation(s)
- Yalda Nozad Mojaver
- Jaw Function and Orofacial Pain Research Unit, Sydney Dental School, Faculty of Medicine and Health, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, New South Wales, Australia
| | - Paul B Tawadros
- Jaw Function and Orofacial Pain Research Unit, Sydney Dental School, Faculty of Medicine and Health, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, New South Wales, Australia
| | - Polyana Moura Ferreira
- Jaw Function and Orofacial Pain Research Unit, Sydney Dental School, Faculty of Medicine and Health, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, New South Wales, Australia
| | - Terry Whittle
- Jaw Function and Orofacial Pain Research Unit, Sydney Dental School, Faculty of Medicine and Health, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, New South Wales, Australia
| | - Greg M Murray
- Jaw Function and Orofacial Pain Research Unit, Sydney Dental School, Faculty of Medicine and Health, Westmead Hospital Centre for Oral Health, The University of Sydney, Westmead, New South Wales, Australia
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18
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Miettinen T, Myllymaa K, Hukkanen T, Töyräs J, Sipilä K, Myllymaa S. Home Polysomnography Reveals a First-Night Effect in Patients With Low Sleep Bruxism Activity. J Clin Sleep Med 2018; 14:1377-1386. [PMID: 30092900 PMCID: PMC6086957 DOI: 10.5664/jcsm.7278] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 04/20/2018] [Accepted: 05/18/2018] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES To examine the presence of a first-night effect (FNE) and the level of internight variability in sleep bruxism (SB) activity when a self-applicable electrode set is used in home polysomnography (PSG) in a sample of subjects with possible SB. METHODS Fourteen females and two males aged 38.3 ± 9.1 years (mean ± standard deviation) with self-reported SB underwent home-PSG on three consecutive nights. The subjects applied PSG sensors themselves, including self-applicable electrode sets used to record sleep and masseter muscle activity. Repeated-measures analysis of variance was used to compare SB and sleep variables between the nights. RESULTS Surprisingly, there were statistically significant elevations in the rhythmic masticatory muscle activity (RMMA) episode index (P = .009), burst index (P = .016), and bruxism time index (P = .049) throughout the course of 3 nights. More bruxers were diagnosed on the second (6 bruxers, ≥ 2 episodes/h) and third night (7 bruxers) compared to the first night (2 bruxers). Most subjects (14/16) had their highest RMMA index on the second or third night. The mean coefficient of variation for RMMA episode index was 50.7%. No statistically significant differences were detected in other sleep variables. CONCLUSIONS The results indicate that a FNE may be present in SB activity, possibly lasting several nights in some subjects. Furthermore, FNE appears to be combined with high internight variability of SB activity without indications of internight changes in sleep macrostructure. To confirm the level of ongoing SB activity, several nights of PSG may be required, especially in subjects with low first-night SB activity. COMMENTARY A commentary on this article appears in this issue on page 1281.
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Affiliation(s)
- Tomi Miettinen
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
- Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
- Department of Clinical Neurophysiology, Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
| | - Katja Myllymaa
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
- Department of Clinical Neurophysiology, Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
| | - Taina Hukkanen
- Department of Clinical Neurophysiology, Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
| | - Juha Töyräs
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
- Department of Clinical Neurophysiology, Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
| | - Kirsi Sipilä
- Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
- Department of Oral and Maxillofacial Diseases, Kuopio University Hospital, Kuopio, Finland
- Oral and Maxillofacial Department, Medical Research Center Oulu, Oulu University Hospital, Oulu, Finland
- Research Unit of Oral Health Sciences, Faculty of Medicine, University of Oulu, Oulu, Finland
| | - Sami Myllymaa
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
- Institute of Dentistry, University of Eastern Finland, Kuopio, Finland
- Department of Clinical Neurophysiology, Diagnostic Imaging Center, Kuopio University Hospital, Kuopio, Finland
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19
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Kim HJ, Park KM, Tak HJ, Choi JW, Kang SH, Park W, Bertin H, Corre P, Lee SH. Skeletal unit construction of rat mandible based on the masticatory muscle anatomy and double microcomputed tomography. Anat Histol Embryol 2018; 47:417-427. [PMID: 29943437 DOI: 10.1111/ahe.12374] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Revised: 04/28/2018] [Accepted: 05/31/2018] [Indexed: 11/26/2022]
Abstract
This study aimed to divide the mandible into skeletal units based on three-dimensional (3D) muscular anatomy with microcomputed tomography (micro-CT) of Sprague-Dawley rat. Five normal rats were micro-CT scanned at 12 weeks of age before and after contrast enhancements for the masticatory muscles. Three-dimensional reconstruction of the mandible was performed from the initial micro-CT images, followed by segmentation of the masticatory muscles using the second enhanced micro-CT data. Bone and muscle models were superimposed based on the teeth and bony structures to evaluate muscular orientation and attachment. The mandible was divided into skeletal units using the bony structures and muscle attachments. The mandibular foramen and mental foramen were adopted as the reference points based on their anatomical and developmental significance. The skeletal units consisted of the condylar, coronoid, angular, body and symphyseal units. Further evaluation of these units in relation to development, growth, and other biology and medicine will be helpful in elucidating their biological identities.
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Affiliation(s)
- Hak-Jin Kim
- Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Seoul, Korea
| | - Kyeong-Mee Park
- Department of Advanced General Dentistry, College of Dentistry, Yonsei University, Seoul, Korea
| | - Hye-Jin Tak
- Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea
| | - Ji Wook Choi
- Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Seoul, Korea
| | - Sang-Hoon Kang
- Department of Oral and Maxillofacial Surgery, National Health Insurance Service, Ilsan Hospital, Goyang-si, Korea
| | - Wonse Park
- Department of Advanced General Dentistry, College of Dentistry, Yonsei University, Seoul, Korea
| | - Helios Bertin
- Stomatology and Maxillo-facial Surgery Unit, Nantes University Hospital, Nantes Cedex 1, France
| | - Pierre Corre
- Stomatology and Maxillo-facial Surgery Unit, Nantes University Hospital, Nantes Cedex 1, France
| | - Sang-Hwy Lee
- Department of Oral and Maxillofacial Surgery, College of Dentistry, Yonsei University, Seoul, Korea.,Oral Science Research Center, College of Dentistry, Yonsei University, Seoul, Korea
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20
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Gazerani P, Cairns BE. Activation of rat masticatory muscle afferent fibres by acidic pH. Somatosens Mot Res 2018; 35:86-94. [PMID: 29848210 DOI: 10.1080/08990220.2018.1473246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
Previous research findings have suggested an important role for acid sensing ion channels (ASICs) in muscle pain mechanisms. This study was conducted to determine if masticatory muscle afferent fibres express ASICs, if there are sex differences in this expression, and to compare the effects of low pH and hypertonic saline on afferent fibres that innervate the masticatory muscle in vivo. Immunohistochemistry methods were applied to examine the expression of ASICs in trigeminal ganglion neurons, while in vivo electrophysiology techniques were employed to examine changes in masticatory muscle afferent fibre excitability. Both ASIC1 and ASIC3 were expressed by predominantly larger masticatory muscle ganglion neurons, but the frequency of ASIC3 expression (56%) was significantly greater than ASIC1 (35%). No sex-related differences in expression were identified. Injection of pH 5.8, but not pH 6.8, phosphate buffered saline evoked afferent discharges that were significantly greater than those evoked by pH 7.4 buffer (control). Since ASIC3 channels are not activated until the pH is around 6, these results indicate that activation of both channels contributes to excitation of masticatory muscle afferent fibres. The results further show that many masticatory muscle afferent fibres, which respond to low pH, are low threshold mechanoreceptors. These findings may explain why injection of low pH solutions into the masticatory muscles of healthy humans is not associated with significant muscle pain.
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Affiliation(s)
- Parisa Gazerani
- a Department of Health Science and Technology, Faculty of Medicine , Aalborg University , Aalborg East , Denmark
| | - Brian Edwin Cairns
- a Department of Health Science and Technology, Faculty of Medicine , Aalborg University , Aalborg East , Denmark.,b Faculty of Pharmaceutical Sciences , The University of British Columbia , Vancouver , Canada
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21
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Bucci R, Lobbezoo F, Michelotti A, Koutris M. Two repetitive bouts of intense eccentric-concentric jaw exercises reduce experimental muscle pain in healthy subjects. J Oral Rehabil 2018; 45:575-580. [PMID: 29782040 DOI: 10.1111/joor.12656] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2018] [Indexed: 12/15/2022]
Abstract
High-intensity eccentric-concentric contractions of the jaw-closing muscles induce muscle soreness, fatigue and functional impairment of the jaw, resembling the symptoms of myalgia, according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD). However, it is claimed that repetition of similar exercises can minimise these detrimental effects. This study aimed to evaluate the response of jaw-closing muscles following two series of intense eccentric-concentric exercises of the masticatory muscles in healthy subjects. Twelve pain-free participants underwent 2 sessions of intense eccentric-concentric jaw exercises, with 1-week interval in between. Each session of jaw exercises comprises 6 sets of 5-minute-long bouts of concentric-eccentric contractions. Self-reported muscle fatigue and pain, maximum mouth opening without pain (MMO), pain pressure thresholds (PPTs) of temporalis and masseter muscles and maximum voluntary bite force (MVBF) were recorded before, immediately after, 24 and 48 hours after each bout of exercises. ANOVA for repeated measurements was used to analyse the data. During session 2, muscle pain and fatigue were statistically significantly decreased (P < .05) as compared to session 1. Furthermore, statistically significant increases of MVBF (P < .005), MMO (P < .005) and PPTs (P < .005) were found at session 2 as compared to session 1. Within the limitations of the study, is can be concluded that the repetition of eccentric-concentric jaw-closing exercises results in signs of muscle training. Future studies can elucidate whether this motor training might be useful for the treatment of myalgia.
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Affiliation(s)
- R Bucci
- Department of Neurosciences, Reproductive Sciences and Oral Sciences, University of Naples Federico II, Naples, Italy
| | - F Lobbezoo
- Department of Oral Kinesiology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
| | - A Michelotti
- Department of Neurosciences, Reproductive Sciences and Oral Sciences, University of Naples Federico II, Naples, Italy
| | - M Koutris
- Department of Oral Kinesiology, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
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22
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Abstract
Neurofibromatosis type 1 (NF1) was first described in 1882 as a hamartomatous disorder of neural crest derivation. We present the imaging of a 65-year-old woman with NF1. Computed tomography revealed that there were three major findings presented: skeletal deformity, an area of fat (probably related to mesodermal dysplasia), and benign neoplasm within the masticator space. Moreover, masticatory muscles were hypoplastic.
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Affiliation(s)
- Yuka Uchiyama
- Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Tetsuro Sumi
- Department of Oral and Maxillofacial Surgery II, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Keisuke Marutani
- Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Hiroo Takaoka
- Department of Oral and Maxillofacial Surgery II, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Shumei Murakami
- Department of Oral and Maxillofacial Radiology, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Hiroyasu Kameyama
- Department of Oral and Maxillofacial Surgery II, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
| | - Yoshiaki Yura
- Department of Oral and Maxillofacial Surgery II, Osaka University Graduate School of Dentistry, Suita, Osaka, Japan
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23
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Yamaguchi S, Okada C, Watanabe Y, Watanabe M, Hattori Y. Analysis of masticatory muscle coordination during unilateral single-tooth clenching using muscle functional magnetic resonance imaging. J Oral Rehabil 2017; 45:9-16. [PMID: 29090477 DOI: 10.1111/joor.12583] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/26/2017] [Indexed: 12/15/2022]
Abstract
In a previous study, we used muscle functional magnetic resonance imaging to show that the anterior movement of the occlusal point increased the activity of the superior head of the ipsilateral lateral pterygoid muscle (ipsilateral SHLP) during unilateral single-tooth clenching. The purpose of this study was to verify the hypothesis that the increased activity of the ipsilateral SHLP described above serves to antagonise the occlusal force acting on the condyle. In total, 9 healthy volunteers were requested to perform left unilateral clenching at the first molar or first premolar region for 1 minute at 20% or 40% maximum voluntary clenching force. Changes in the mean proton transverse relaxation time (∆T2) were examined from the magnetic resonance images obtained before and after each clenching act as an index of the activity in all masticatory muscles. Correlation analyses of the mean ΔT2 for each volume of interest were performed with the first molar or premolar clenches to analyse the correlation between the activities in each muscle. A statistically significant correlation was exhibited between the ipsilateral temporal and ipsilateral SHLP (r = .651, P = .003) during first premolar clenching. However, no significant correlations were observed in the ipsilateral SHLP during first molar clenching. The results of this study suggest that the ipsilateral SHLP may contribute to the pulling of the mandibular condyle forward against the occlusal force generated by the ipsilateral temporal muscle.
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Affiliation(s)
- S Yamaguchi
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - C Okada
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Y Watanabe
- Department of Health Services Management, Faculty of Health Sciences, Tohoku Fukushi University, Sendai, Japan.,Kansei Fukushi Research Center, Tohoku Fukushi University, Sendai, Japan
| | - M Watanabe
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.,Kansei Fukushi Research Center, Tohoku Fukushi University, Sendai, Japan
| | - Y Hattori
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
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24
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Hayashi N, Sato T, Fukushima Y, Takano A, Sakamoto I, Yoda T. A two-year follow-up of surgical and non-surgical treatments in patients with masticatory muscle tendon-aponeurosis hyperplasia. Int J Oral Maxillofac Surg 2018; 47:199-204. [PMID: 28823904 DOI: 10.1016/j.ijom.2017.07.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 05/25/2017] [Accepted: 07/13/2017] [Indexed: 11/21/2022]
Abstract
This study re-examined the usefulness of surgery for the management of masticatory muscle tendon-aponeurosis hyperplasia (MMTAH) through a comparison of the outcomes between patients who underwent surgery and those who did not. The duration of follow-up was 2 years. Twenty-eight patients who attended the study hospital and were given a diagnosis of MMTAH were included. Nineteen patients underwent surgery (surgical group) and nine patients were instructed to open their mouths wide once a day and did not undergo surgery (non-surgical group). Maximum mouth opening, impairment of daily activities, satisfaction, and the status of mouth opening training were evaluated after surgery. The mean increase in mouth opening after 2 years was 20.2mm in the surgical group and 2.4mm in the non-surgical group. Adequate mouth opening training led to satisfactory results 2 years postoperative, and sustained mouth opening training for 6 months after surgery was a key factor for obtaining good outcomes. The general condition and personality of individual patients should be evaluated carefully before surgery to estimate whether or not they can endure the pain associated with postoperative mouth opening training. The results of this study suggest that the surgical procedure is useful for the management of MMTAH.
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25
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Chen H, Whittle T, Gal JA, Murray GM, Klineberg IJ. The medial pterygoid muscle: a stabiliser of horizontal jaw movement. J Oral Rehabil 2017; 44:779-790. [PMID: 28664577 DOI: 10.1111/joor.12542] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/25/2017] [Indexed: 11/30/2022]
Abstract
There is limited information of the normal function of the human medial pterygoid muscle (MPt). The aims were to determine whether (i) the MPt is active throughout horizontal jaw movements with the teeth apart and (ii) whether single motor units (SMUs) are active during horizontal and opening-closing jaw movements. Intramuscular electrodes were placed in the right MPt of 18 participants who performed five teeth-apart tasks: (i) postural position, (ii) ipsilateral (i.e. right) jaw movement, (iii) contralateral movement, (iv) protrusive movement and (v) opening-closing movement. Movement tasks were guided by a target and were divided into BEFORE, OUT, HOLDING, RETURN and AFTER phases according to the movement trajectories recorded by a jaw tracking system. Increased EMG activity was consistently found in the OUT, HOLDING and RETURN phases of the contralateral and protrusive movement tasks. An increased RETURN phase activity in the ipsilateral task indicates an important role for the MPt in the contralateral force vector. Of the 14 SMUs active in the opening-closing task, 64% were also active in at least one horizontal task. There were tonically active SMUs at the postural jaw position in 44% of participants. These new data point to an important role for the MPt in the fine control of low forces as required for stabilisation of vertical mandibular position not only to maintain postural position, but also throughout horizontal jaw movements with the teeth apart. These findings provide baseline information for future investigations of the possible role of this muscle in oro-facial pain conditions.
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Affiliation(s)
- H Chen
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Hospital Centre for Oral Health, University of Sydney, Westmead, NSW, Australia
| | - T Whittle
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Hospital Centre for Oral Health, University of Sydney, Westmead, NSW, Australia
| | - J A Gal
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Hospital Centre for Oral Health, University of Sydney, Westmead, NSW, Australia
| | - G M Murray
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Hospital Centre for Oral Health, University of Sydney, Westmead, NSW, Australia
| | - I J Klineberg
- Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, Westmead Hospital Centre for Oral Health, University of Sydney, Westmead, NSW, Australia
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26
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Fabre PH, Herrel A, Fitriana Y, Meslin L, Hautier L. Masticatory muscle architecture in a water-rat from Australasia (Murinae, Hydromys) and its implication for the evolution of carnivory in rodents. J Anat 2017; 231:380-397. [PMID: 28585258 DOI: 10.1111/joa.12639] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/11/2017] [Indexed: 01/29/2023] Open
Abstract
Murines are well known for their generalist diet, but several of them display specializations towards a carnivorous diet such as the amphibious Indo-Pacific water-rats. Despite the fact that carnivory evolved repeatedly in this group, few studies have investigated associated changes in jaw muscle anatomy and biomechanics. Here, we describe the jaw muscles and cranial anatomy of a carnivorous water-rat, Hydromys chrysogaster. The architecture of the jaw musculature of six specimens captured both on Obi and Papua were studied and described using dissections. We identified the origin and insertions of the jaw muscles, and quantified muscle mass, fiber length, physiological cross-sectional area, and muscle vectors for each muscle. Using a biomechanical model, we estimated maximum incisor and molar bite force at different gape angles. Finally, we conducted a 2D geometric morphometric analyses to compare jaw shape, mechanical potential, and diversity in lever-arm ratios for a set of 238 specimens, representative of Australo-Papuan carnivorous and omnivorous murids. Our study reveals major changes in the muscle proportions among Hydromys and its omnivorous close relative, Melomys. Hydromys was found to have large superficial masseter and temporalis muscles as well as a reduced deep masseter and zygomatico-mandibularis, highlighting major functional divergence among omnivorous and carnivorous murines. Changes in these muscles are also accompanied by changes in jaw shape and the lines of action of the muscles. A more vertically oriented masseter, reduced masseteric muscles, as well as an elongated jaw with proodont lower incisors are key features indicative of a reduced propalinality in carnivorous Hydromys. Differences in the fiber length of the masseteric muscles were also detected between Hydromys and Melomys, which highlight potential adaptations to a wide gape in Hydromys, allowing it to prey on larger animals. Using a biomechanical model, we inferred a greater bite force in Hydromys than in Melomys, implying a functional shift between omnivory and carnivory. However, Melomys has an unexpected greater bite force at large gape compared with Hydromys. Compared with omnivorous Melomys, Hydromys have a very distinctive low mandible with a well-developed coronoid process, and a reduced angular process that projects posteriorly to the ascending rami. This jaw shape, along with our mechanical potential and jaw lever ratio estimates, suggests that Hydromys has a faster jaw closing at the incisor, with a higher bite force at the level of the molars. The narrowing of the Hydromys jaw explains this higher lever advantage at the molars, which constitutes a good compromise between a wide gape, a reduced anterior masseteric mass, and long fiber lengths. Lever arms of the superficial and deep masseter are less favourable to force output of the mandible in Hydromys but more favourable to speed. Compared with the small input lever arm defined between the condyle and the angular process, the relatively longer mandible of Hydromys increases the speed at the expense of the output force. This unique combination of morphological features of the masticatory apparatus possibly has permitted Hydromys to become a highly successful amphibious predator in the Indo-Pacific region.
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Affiliation(s)
- P-H Fabre
- Institut des Sciences de l'Evolution (ISEM, UMR 5554 CNRS), Universite Montpellier II, Montpellier, France.,National Museum of Natural History, Smithsonian Institution, Washington, DC, USA.,Harvard Museum of Comparative Zoology, Cambridge, MA, USA
| | - A Herrel
- Département d'Ecologie et de Gestion de la Biodiversité, UMR 7179 C.N.R.S/M.N.H.N., Paris, France.,Evolutionary Morphology of Vertebrates, Ghent University, Gent, Belgium
| | - Y Fitriana
- Museum Zoologicum Bogoriense, Research Center For Biology, Indonesian Institute of Sciences (LIPI), Cibinong, Indonesia
| | - L Meslin
- Institut des Sciences de l'Evolution (ISEM, UMR 5554 CNRS), Universite Montpellier II, Montpellier, France
| | - L Hautier
- Institut des Sciences de l'Evolution (ISEM, UMR 5554 CNRS), Universite Montpellier II, Montpellier, France
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27
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Okada C, Yamaguchi S, Watanabe Y, Watanabe M, Hattori Y. Evaluation of masticatory activity during unilateral single tooth clenching using muscle functional magnetic resonance imaging. J Oral Rehabil 2016; 43:583-90. [PMID: 27113040 DOI: 10.1111/joor.12404] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/27/2016] [Indexed: 11/30/2022]
Abstract
Masticatory muscle activity during teeth clenching is affected by occlusal pattern. However, few studies have performed simultaneous evaluation of all masticatory activities during teeth clenching under various occlusal conditions. The aim of this study was to use muscle functional magnetic resonance imaging (mfMRI) to evaluate the effects of changes in occlusal point on masticatory activity during single tooth clenching. Changes in mean proton transverse relaxation time (∆T2) as an index of activity in all masticatory muscles during left unilateral clenching at the first molar or first premolar for 1 min were examined in nine healthy volunteers. Bite force was maintained at 40% of the maximum voluntary clenching force. The ∆T2 values of the masseter and lateral pterygoid muscles were analysed separately for superficial and deep layers, and for superior and inferior heads. The ∆T2 values for the ipsilateral deep masseter were significantly lower, and for the superior head of the ipsilateral lateral pterygoid muscles were significantly higher, after left first premolar clenching compared to left first molar clenching. These results quantitatively demonstrate a significant increase in activity of the superior head of the ipsilateral lateral pterygoid muscle and a significant decrease in activity of the ipsilateral deep masseter muscle with forward displacement of the occlusal contact point during unilateral tooth clenching.
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Affiliation(s)
- C Okada
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - S Yamaguchi
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Y Watanabe
- Department of Health Services Management, Faculty of Health Sciences, Tohoku Fukushi University, Sendai, Japan
| | - M Watanabe
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan.,Kansei Fukushi Research Center, Tohoku Fukushi University, Sendai, Japan
| | - Y Hattori
- Division of Aging and Geriatric Dentistry, Tohoku University Graduate School of Dentistry, Sendai, Japan
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28
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Iwasaki LR, Gonzalez YM, Liu H, Marx DB, Gallo LM, Nickel JC. A pilot study of ambulatory masticatory muscle activities in temporomandibular joint disorders diagnostic groups. Orthod Craniofac Res 2015; 18 Suppl 1:146-55. [PMID: 25865543 PMCID: PMC4396707 DOI: 10.1111/ocr.12085] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/26/2014] [Indexed: 11/26/2022]
Abstract
OBJECTIVE To determine differences in masticatory muscle usage between temporomandibular joint disorders diagnostic groups. SETTING AND SAMPLE POPULATION Seventy-one informed and consented subjects (27 men; 44 women) participated at the University at Buffalo. MATERIAL AND METHODS Research diagnostic criteria and imaging data were used to categorize subjects according to the presence/absence +/- of TMJ disc placement (DD) and chronic pain (P) (+DD+P, n=18; +DD-P, n=14; -DD-P, n=39). Electromyographic (EMG)/bite-force calibrations determined subject-specific masseter and temporalis muscle activities per 20 N bite-force (T20N , μV). Over 3 days and nights, subjects collected EMG recordings. Duty factors (DFs, % of recording time) were determined based on threshold intervals (5-9, 10-24, 25-49, 50-79, ≥80% T20N ). anova and Tukey-Kramer post hoc tests identified 1) diagnostic group differences in T20N and 2) the effects of diagnostic group, gender, time and interval on muscle DFs. RESULTS Mean (±SE) temporalis T20N in +DD+P subjects was significantly higher (71.4±8.8 μV) than masseter T20N in these subjects (19.6±8.8 μV; p=0.001) and in -DD-P subjects (25.3±6.0 μV, p=0.0007). Masseter DFs at 5-9% T20N were significantly higher in +DD-P women (3.48%) than +DD-P men (0.85%) and women and men in both other diagnostic groups (all p<0.03), and in +DD+P women (2.00%) compared to -DD-P men (0.83%; p=0.029). Night-time DFs at 5-9% T20N in +DD-P women (1.97%) were significantly higher than in -DD-P men (0.47%) and women (0.24%; all p<0.01). CONCLUSIONS Between-group differences were found in masticatory muscle activities in both laboratory and natural environmental settings.
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Affiliation(s)
- L R Iwasaki
- Departments of Orthodontics & Dentofacial Orthopedics and Oral & Craniofacial Sciences, School of Dentistry, University of Missouri-Kansas City, Kansas City, MO, USA
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29
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Yuan F, Lin X, Guan Y, Mu Z, Chen K, Wang Y, Yang GY. Collateral circulation prevents masticatory muscle impairment in rat middle cerebral artery occlusion model. J Synchrotron Radiat 2014; 21:1314-1318. [PMID: 25343800 DOI: 10.1107/s1600577514016130] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 07/11/2014] [Indexed: 06/04/2023]
Abstract
The rat suture middle cerebral artery occlusion (MCAO) is a frequently used animal model for investigating the mechanisms of ischemic brain injury. During suture MCAO, transection of the external carotid artery (ECA) potentially restrains blood flow and impairs masticatory muscle and other ECA-supported territories, consequently influencing post-operation animal survival. This study was aimed at investigating the effect of ECA transection on the hemodynamic alterations using a novel synchrotron radiation (SR) angiography technique and magnetic resonance imaging in live animals. Fifteen male adult Sprague-Dawley rats were used in this study. Animals underwent MCAO, in which the ECA was transected. SR angiography was performed before and after MCAO. Rats then underwent magnetic resonance imaging (MRI) to detect the tissue lesion both intra- and extra-cranially. Animals with SR angiography without other manipulations were used as control. High-resolution cerebrovascular morphology was analyzed using a novel technique of SR angiography. The masticatory muscle lesion was further examined by hematoxylin and eosin staining. MRI and histological results showed that there was no masticatory muscle lesion at 1, 7 and 28 days following MCAO with ECA transection. In normal condition, the ECA and its branch external maxillary artery were clearly detected. Following ECA transection, the external maxillary artery was still observed and the blood supply appeared from the anastomotic branch from the pterygopalatine artery. SR angiography further revealed the inter-relationship of hemisphere extra- and intra-cranial vasculature in the rat following MCAO. Transection of the ECA did not impair masticatory muscles in rat suture MCAO. Interrupted blood flow could be compensated by the collateral circulation from the pterygopalatine artery.
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Affiliation(s)
- Falei Yuan
- Med-X Research Institute and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
| | - Xiaojie Lin
- Med-X Research Institute and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
| | - Yongjing Guan
- Department of Radiology, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, People's Republic of China
| | - Zhihao Mu
- Med-X Research Institute and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
| | - Kemin Chen
- Department of Radiology, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, People's Republic of China
| | - Yongting Wang
- Med-X Research Institute and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
| | - Guo-Yuan Yang
- Med-X Research Institute and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China
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30
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Needle DB, Hollinger C, Shelton GD, Fitzgerald SD. Necrotizing and eosinophilic masticatory myositis in farmed mink: a preliminary description. J Comp Pathol 2014; 151:217-27. [PMID: 25016423 DOI: 10.1016/j.jcpa.2014.04.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2013] [Revised: 03/18/2014] [Accepted: 04/29/2014] [Indexed: 10/25/2022]
Abstract
This report describes necrotizing and eosinophilic myositis affecting the masticatory muscles of a group of mink. Affected animals demonstrated sudden death with marked subcutaneous oedema over the dorsal head. The temporalis and masseter muscles were pale, swollen and friable. Histologic changes consisted of varying degrees of myodegeneration, myonecrosis and inflammation. Eosinophils were prominent in the inflammatory infiltrate. Similar to dogs, masticatory muscles in mink were found to contain unique type 2M fibres, suggesting a possible target for an immune response. Aerobic and anaerobic tissue cultures of the affected musculature revealed no significant pathogens. Histological and nutritional analyses were not typical of vitamin E/selenium deficiency. This case series supports the existence of a novel disease entity in mink with some features comparable with masticatory muscle myositis in dogs.
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Affiliation(s)
- D B Needle
- Department of Pathobiology, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48894, USA
| | - C Hollinger
- Department of Pathobiology, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48894, USA
| | - G D Shelton
- Department of Pathology, School of Medicine, University of California San Diego, La Jolla, CA 92093-0709, USA
| | - S D Fitzgerald
- Department of Pathobiology, College of Veterinary Medicine, Michigan State University, East Lansing, MI 48894, USA.
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31
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Widmer C, Nguyen VD, Chiang H, Morris-Wiman J. Increased vertical dimension effects on masseter muscle fiber phenotype during maturation. Angle Orthod 2013; 83:57-62. [PMID: 22551233 PMCID: PMC8805540 DOI: 10.2319/122111-786.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Accepted: 03/01/2012] [Indexed: 12/18/2023] Open
Abstract
OBJECTIVE To determine changes in mouse myosin heavy chain (MyHC) protein expression that may occur with a clinically relevant vertical dimension of occlusion (VDO) increase. MATERIALS AND METHODS Six CD-1 male mice (age: 6 weeks) underwent a 10% bite opening to replicate the clinical condition using composite on the maxillary molars and were compared to six age-matched controls. Mice were sacrificed at day 7 and 14 after bite opening. A representative masseter transverse cryosection from each animal was examined in selected sampling regions (anterior, posterior, posterior-deep, and posterior-intermediate) to assay fiber phenotype proportions and fiber size. RESULTS In control masseter muscles, the proportion of muscle fibers containing MyHC IIb increased in the posterior-intermediate and posterior-deep regions between 7 and 14 days (ANOVA, P < .05). The increase in the proportion of MyHC IIb fibers in the bite opening group did not occur when compared to the control group (P < .05). In addition, after 14 days of bite opening, the proportion of fibers positive for MyHC IIa was decreased in the anterior region compared to control masseter muscles. Muscle fiber diameter remained unchanged in both groups (experimental and control) and over time (P > .10). CONCLUSION These data are consistent with a selective plasticity of the expression of MyHC IIb protein in the deep regions of the male masseter muscle in response to a clinically relevant VDO increase.
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Affiliation(s)
- Charles Widmer
- Department of Orthodontics, University of Florida College of Dentistry, Gainesville, FL 32610-0444, USA.
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