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Rafael Poveda-Roda, Pilar Moreno, José Bagán, María Margaix
AIMS: To determine whether subjects with temporomandibular disorders (TMD) manifesting as chronic myofascial pain (MFP) involving the masseter muscle present with significantly greater masseter muscle width, as evidenced by ultrasound, compared to individuals without MFP. METHODS: A case-control study was carried out. A total of 31 subjects presenting with MFP of the masticatory muscles involving the masseter muscle and 35 controls with TMD but no diagnosis of MFP, matched by age and sex, were included...
March 21, 2018: Journal of Oral & Facial Pain and Headache
Manabu Masuda, Takashi Iida, Fernando G Exposto, Lene Baad-Hansen, Misao Kawara, Osamu Komiyama, Peter Svensson
AIMS: To determine if standardized palpation of the masseter muscle can evoke referred pain and/or sensations in healthy individuals and to compare the mechanical sensitivities in response to three different levels of palpation force. METHODS: A total of 32 pain-free individuals participated. The right masseter muscle was divided into 15 test sites. Mechanical sensitivity of the masseter was assessed with three mechanical stimuli (0.5 kg, 1.0 kg, or 2.0 kg) applied by palpometers to the 15 test sites for 5 seconds each site...
March 21, 2018: Journal of Oral & Facial Pain and Headache
Jessica E Steele, Ian R Woodcock, Adrian D Murphy, Monique M Ryan, Tony J Penington, Christopher J Coombs
INTRODUCTION: Masticatory muscles or their nerve supply are options for facial reanimation surgery, but their ability to create spontaneous smile has been questioned. This study assessed the percentage of healthy adults who activate the temporalis and masseter muscles during voluntary and spontaneous smile. METHODS: Healthy volunteer adults underwent electromyography (EMG) studies of the temporalis and masseter muscles during voluntary and spontaneous smile. Responses were repeated three times and recorded as negative, weakly positive, or strongly positive according to the activity observed...
March 6, 2018: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
Domenico Ciavarella, Michele Tepedino, Michele Laurenziello, Laura Guida, Giuseppe Troiano, Graziano Montaruli, Gaetano Illuzzi, Claudio Chimenti, Lorenzo Lo Muzio
INTRODUCTION: Temporomandibular disease (TMD) etiology is multifactorial and is related to many perpetuating, predisposing, and initiating factors. The daytime parafunctions may have an important role in TMD pathogenesis. The most frequent parafunctions analyzed were the static parafunction (ie, clenching) and the dynamic parafunction (ie, grinding). In the present paper, the authors evaluated the swallowing (an oral function/parafunction) with the surface electromyography in patients with TMD...
March 16, 2018: Journal of Craniofacial Surgery
Guan Yun Frances Wang, Xiang Qun Shi, Wenjia Wu, Maria Gueorguieva, Mu Yang, Ji Zhang
Temporomandibular disorder (TMD) is a set of heterogeneous musculoskeletal conditions involving the temporomandibular joint (TMJ) and/or the masticatory muscles. Up to 33% of the population has had at least one symptom of TMD with 5-10% of them requiring treatment. Common symptoms include limited jaw movement, joint sound, and pain in the orofacial area. Once TMD becomes chronic, it can be debilitating with comorbidities that greatly reduce one's overall quality of life. However, the underlying mechanism of TMD is unclear due to the multicausative nature of the disease...
March 12, 2018: Pain
F G Exposto, M Masuda, E E Castrillon, P Svensson
Objective To assess if repeated intramuscular injections of nerve growth factor into the temporalis and masseter muscles increase mechanical sensitivity and entropy scores. Furthermore, to investigate if increased mechanical sensitivity would lead to increased prevalence of referred pain in the studied individuals. Finally, if increased muscle sensitization would lead to an increase in number of headache days during the experimental period. Methods The present double-blind, randomized placebo-controlled study recruited 16 healthy participants who were injected with nerve growth-factor, on 2 days, into the masseter and temporalis muscles and isotonic saline on the contralateral side...
January 1, 2018: Cephalalgia: An International Journal of Headache
Seiya Kato, Daisuke Ekuni, Shigehisa Kawakami, Acing Habibie Mude, Manabu Morita, Shogo Minagi
OBJECTIVE: This study was conducted to investigate whether the masseter muscle activity shows any specific pattern in relation to the severity of periodontitis. DESIGN: Sixteen subjects with no or mild periodontitis (NMP group) and 15 subjects with moderate or severe periodontitis (MSP group) were enrolled. Plasma IgG antibody titer was examined using Porphyromonas gingivalis as a bacterial antigen. Surface electromyography (EMG) of the masseter muscles was continuously recorded using an ambulatory surface EMG recording device while patients were awake and asleep...
March 1, 2018: Archives of Oral Biology
Feixia Zheng, Xiuyun Ye, Xulai Shi, Neha Devi Poonit, Zhongdong Lin
The use of botulinum neurotoxin serotype A (BoNT-A) injections for the treatment of orofacial dyskinesia secondary to anti- N -methyl-d-aspartate receptor (NMDAR) encephalitis is rarely reported. Here, we report a case of an urgent, successful management of severe orofacial dyskinesia in an 8-year-old girl with anti-NMDAR encephalitis using BoNT-A injection. The patient presented with de novo unilateral paroxysmal movement disorder progressing to generalized dystonia and repetitive orofacial dyskinesia. Diagnosis was confirmed by the presence of NMDAR antibodies in serum and cerebrospinal fluid...
2018: Frontiers in Neurology
Kohei Yamaguchi, Haruka Tohara, Koji Hara, Ayako Nakane, Eriko Kajisa, Kanako Yoshimi, Shunsuke Minakuchi
BACKGROUND: Previous studies have reported a relationship between masseter muscle thickness and tooth loss or limb muscle thickness. However, it is not yet known whether masseter muscle thickness is related to appendicular skeletal muscle mass, and grip strength. The purpose of this study was to determine which of the two variables-tooth loss or appendicular skeletal muscle mass index-is more strongly related to masseter muscle thickness, and to identify a suitable indicator of decreasing masseter muscle thickness in healthy elderly individuals...
March 8, 2018: BMC Geriatrics
Yun Wang, Lan-Fang Yu, Meng-Ya Wang
To observe the plasticity changes of trigeminal motor nucleus (Mo5) and masseter H-reflex in unilateral mastication model rats and explore the possible mechanism of functional plasticity in motor center involved in unilateral mastication, 54 adult male Wistar rats were randomly divided into 1-month (n = 10), 3-month (n = 10), and 16-month (n = 7) model groups and their corresponding control groups, respectively. Unilateral mastication model rats were prepared by intermittent removal of clinical crowns of left teeth (model side)...
February 25, 2018: Sheng Li Xue Bao: [Acta Physiologica Sinica]
Iacopo Cioffi, Mona Sobhani, Howard C Tenenbaum, Alicia Howard, Bruce V Freeman, Michael Thaut
AIMS: To evaluate the effects of Guided Music Listening (GML) on masticatory muscles and on the amplitude of wake-time tooth clenching in individuals with higher vs lower frequency of clenching episodes. METHODS: The electromyographic (EMG) activity of the right masseter was recorded during three 20-minute music (relaxing, stress/tension, and favorite) tasks and a control no-music task in 10 (mean age ± standard deviation [SD] = 21.4 ± 3.0 years) and 11 (22.6 ± 2...
February 28, 2018: Journal of Oral & Facial Pain and Headache
Lydia Eberhard, Keunyoung Oh, Constantin Eiffler, Peter Rammelsberg, Stefanie Kappel, Hans-Jürgen Schindler, Nikolaos Nikitas Giannakopoulos
OBJECTIVE: The aim of this study was to observe the adaptation strategy of the stomatognathic system during the adaptation of complete dentures, comprising masticatory parameters and subjective measures. Our hypothesis was that with new dentures, masticatory performance would increase while the effort of the system is kept constant. MATERIAL AND METHODS: Thirty-two patients received standardized new complete dentures. Masticatory performance tests were conducted with old dentures (T1), immediately after incorporation of new dentures (T2) and after an adaptation period of 3 months (T3)...
February 27, 2018: Clinical Oral Investigations
D Helf, D Schneiderbanger, C K Markus, S Johannsen, F Schuster
In a 59-year-old woman with a perforating eyeball injury to the right eye, the emergency physician induced a preclinical general anesthesia with propofol, fentanyl and the depolarizing muscle relaxant succinylcholine. Anesthesia was maintained using propofol and remifentanil infusion throughout the preoperative period and the subsequent surgical procedure. Postoperatively, isolated rhabdomyolysis with an increase in serum creatine kinase to >20,000 U/l was observed. The diagnosis of malignant hyperthermia (MH) susceptibility could be confirmed in the patient 4 months after the acute event by the in vitro contracture test and detection of the MH causative mutation p...
February 26, 2018: Der Anaesthesist
Akiko Tsujisaka, Shingo Haraki, Shigeru Nonoue, Akira Mikami, Hiroyoshi Adachi, Takahiro Mizumori, Hirofumi Yatani, Atsushi Yoshida, Takafumi Kato
PURPOSE: Concomitant occurrence of respiratory events can be often overlooked in the clinical practice of SB. This study assessed physiological characteristics of rhythmic masticatory muscle activity (RMMA) and concomitant respiratory events in young SB subjects asymptomatic to obstructive sleep apnea (OSA). METHODS: Twenty-two subjects (age: 24.1±1.9years; F 8: M 14; BMI: 20.2±1.9kg/m2 ) were polysomnographically diagnosed as moderate-severe SB. Sleep architecture, oromotor (RMMA and non-specific masseter activity [NSMA]) and apnea/hypopnea events were scored...
February 20, 2018: Journal of Prosthodontic Research
Jagath C Ranasinghe, Chandani Wickramasinghe, Ganganath Rodrigo
BACKGROUND: Temporalis muscle hypertrophy is a rare entity of masticatory muscle hypertrophy. All types of masticatory muscle hypertrophies have been documented of which temporalis muscle hypertrophy is one. Temporalis muscle hypertrophy is most commonly bilateral and usually associated with other types of masticatory muscles hypertrophy such as masseter or pterygoid hypertrophy. However, isolated unilateral temporalis muscle hypertrophy is extremely rare and only 9 cases have been reported to date in English literature since 1990 with only two patients less than 18 years...
February 19, 2018: BMC Pediatrics
Tetsuro Watase, Kohei Shimizu, Kinuyo Ohara, Hiroki Komiya, Kohei Kanno, Keisuke Hatori, Noboru Noma, Kuniya Honda, Yoshiyuki Tsuboi, Ayano Katagiri, Masamichi Shinoda, Bunnai Ogiso, Koichi Iwata
No abstract text is available yet for this article.
January 1, 2018: Molecular Pain
Antonino Lo Giudice, Idona Brewer, Rosalia Leonardi, Neal Roberts, Gianluca Bagnato
The aim of the study was to evaluate whether a reduced pain threshold is associated with increased temporomandibular dysfunction in systemic sclerosis (SSc) compared to psoriatic arthritis (PsA) and healthy controls. Ninety subjects participated in the study (30 SSc, 30 PsA, and 30 healthy controls). The Helkimo index was used to evaluate temporomandibular dysfunction. Digital palpation was performed at the temporomandibular joint (TMJ) surface and at the superficial masseter muscle (SMM) and pain intensity was recorded on a visual analog scale (VAS), while pain pressure threshold (PPT) was measured at the same sites through a pressure algometer...
February 14, 2018: Clinical Rheumatology
Hong Zhang, Abhishek Kumar, Xiaoping Luo, Krister Svensson, Mats Trulsson, Peter Svensson
We hypothesized that the trigeminally innervated jaw muscles and spinally innervated hand muscles would differ in the force control and muscle activity when similar fine motor training tasks are performed. Sixteen healthy volunteers performed six series (with ten trials each) of an oral fine motor task (OFMT) and a hand fine motor task (HFMT), in random order. The task was to hold-and-break a test material (5 cm spaghetti pasta) placed on the force transducer between either their anterior teeth (OFMT) or the thumb and the index finger (HFMT)...
February 6, 2018: Human Movement Science
Daniela Galvão de Almeida Prado, Giédre Berretin-Felix, Renata Resina Migliorucci, Mariana da Rocha Salles Bueno, Raquel Rodrigues Rosa, Marcela Polizel, Isadora Ferraz Teixeira, Maria Beatriz Duarte Gavião
OBJECTIVES: The esthetic and functional results of orthognathic surgery of severe dentofacial deformities are predictable, however there are differences regarding the effects on stomatognathic system. The aim was to investigate the effects of orofacial myofunctional therapy (OMT) on the masticatory function in individuals with dentofacial deformity submitted to orthognathic surgery (OGS). MATERIAL AND METHODS: Forty-eight individuals (18-40 years) were evaluated, 14 undergoing OMT (treated group-TG), 10 without this treatment (untreated group-UTG) and 24 in a control group with normal occlusion; for clinical aspects the data of an individual was missed (n=46)...
February 1, 2018: Journal of Applied Oral Science: Revista FOB
Erkan Öztürk, Eren Yılmaz, İlker Erdinç Öztürk, Beldan Polat, Kadir Serkan Orhan
Intramuscular hemangiomas (IMH) account for <%1 of all hemangiomas and are rarely located in the head and neck region. The most common site of origin in the head and neck is the masseter muscle, whereas IMH originating from the scalene muscles are rarely seen. Surgical excision of intramuscular hemangioma is considered the main treatment modality. Here we present the case of a male patient aged 17 with IMH that occured after blunt trauma in the supraclavicular region, fed by the thyrocervical and costocervical trunks, and with an arteriovenous shunt...
June 2017: Turkish Archives of Otorhinolaryngology
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