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https://www.readbyqxmd.com/read/28102011/local-myogenic-pulp-derived-cell-injection-enhances-craniofacial-muscle-regeneration-in-vivo
#1
J E Jung, M J Song, S Shin, Y J Choi, K H Kim, C J Chung
OBJECTIVES: To enhance myogenic differentiation in pulp cells isolated from extracted premolars by epigenetic modification using a DNA demethylation agent, 5-aza-2'-deoxycytidine (5-Aza), and to evaluate the potent stimulatory effect of 5-Aza-treated pulp cell injection for craniofacial muscle regeneration in vivo. SETTING AND SAMPLE POPULATION: Pulp cells were isolated from premolars extracted for orthodontic purposes from four adults (age range, 18-22.1 years)...
February 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28093778/brainstem-reflex-excitability-changes-in-patients-with-als
#2
Bülent Cengiz, Merve Bahar Ercan, Mustafa İskender, Hidayet Reha Kuruoğlu
Objective We explored brainstem reflex excitability changes, blink reflex recovery cycles (BRRC), and masseter inhibitory reflexes (MIR) in patients with ALS. Methods Fourteen ALS patients and 14 healthy control subjects were recruited. The BRRC was examined at interstimulus intervals (ISI) of 100, 200, 300, 400, 500, and 600 ms. The latencies and durations of silent period 1 (SP1) and silent period 2 (SP2) of the MIR were measured. Results Decreased R2 area suppression was prominent in the ALS group at ISIs of 200, 300, and 400 ms (P<0...
January 17, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28060782/high-density-emg-reveals-novel-evidence-of-altered-masseter-muscle-activity-during-symmetrical-and-asymmetrical-bilateral-jaw-clenching-tasks-in-people-with-chronic-nonspecific-neck-pain
#3
Marco Testa, Tommaso Geri, Leonardo Gizzi, Deborah Falla
OBJECTIVES: To characterize the distribution of masseter muscle activity and force control during bilateral jaw clenching tasks in people with chronic nonspecific neck pain, without an associated temporomandibular disorder. METHODS: Twelve volunteers with nonspecific neck pain and 12 age-matched and sex-matched healthy individuals participated. Submaximal symmetrical and asymmetrical bilateral jaw clenching was performed with and without visual feedback of force...
February 2017: Clinical Journal of Pain
https://www.readbyqxmd.com/read/28054261/effectiveness-of-low-level-laser-therapy-on-pain-intensity-pressure-pain-threshold-and-sf-mpq-indexes-of-women-with-myofascial-pain
#4
Laís Valencise Magri, Vinícius Almeida Carvalho, Flávia Cássia Cabral Rodrigues, César Bataglion, Christie Ramos Andrade Leite-Panissi
Women with temporomandibular disorders (TMD) frequently report pain areas in body regions. This process is associated with central sensitization phenomena, present in chronic pain. The low-level laser therapy (LLLT) has been reported as a therapeutic option for the painful TMD treatment. The aim of this study was to analyze the effect of LLLT on pain intensity (visual analogue scale, VAS), pain sensitivity in orofacial and corporal points (pressure pain threshold, PPT), and on Short Form-McGill Pain Questionnaire (SF-MPQ) indexes of women with myofascial pain (subtype of muscle TMD)...
January 4, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28051277/the-role-of-p2x3-receptors-in-bilateral-masseter-muscle-allodynia-in-rats
#5
Petra Tariba Knežević, Robert Vukman, Robert Antonić, Zoran Kovač, Ivone Uhač, Sunčana Simonić-Kocijan
AIM: To determine the relationship between bilateral allodynia induced by masseter inflammation and P2X3 receptor expression changes in trigeminal ganglia (TRG) and the influence of intramasseteric P2X3 antagonist administration on bilateral masseter allodynia. METHODS: To induce bilateral allodynia, rats received a unilateral injection of complete Freund's adjuvant (CFA) into the masseter muscle. Bilateral head withdrawal threshold (HWT) was measured 4 days later...
December 31, 2016: Croatian Medical Journal
https://www.readbyqxmd.com/read/28048452/we-fg-202-07-an-mri-based-approach-to-quantify-radiation-induced-normal-tissue-injury-applied-to-trismus-after-head-and-neck-cancer-radiotherapy
#6
M Thor, N Tyagi, V Hazoglou, Z Saleh, N Riaz, N Lee, J Deasy
PURPOSE: The aim of this study was to investigate if quantitative MRI-derived metrics from four masticatory muscles could explain mouth-opening limitation/trismus following intensity-modulated radiotherapy (IMRT) for head and neck cancer (HNC). METHODS: Fifteen intensity-based MRI metrics were derived from the masseter, lateral and medial pterygoid, and temporalis in T1-weighted scans acquired pre- and post gadolinium injection (T1Pre, T1Post) of 16, of in total 20, patients (8 symptomatic; 8 asymptomatic age/sex/tumor location-matched) treated with IMRT to 70 Gy (median) for HNC in 2005-2009...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042813/the-anatomical-basis-of-paradoxical-masseteric-bulging-after-botulinum-neurotoxin-type-a-injection
#7
Hyung-Jin Lee, In-Won Kang, Kyle K Seo, You-Jin Choi, Seong-Taek Kim, Kyung-Seok Hu, Hee-Jin Kim
The aim of this study was to determine the detailed anatomical structures of the superficial part of the masseter and to elucidate the boundaries and locations of the deep tendon structure within the superficial part of the masseter. Forty-four hemifaces from Korean and Thai embalmed cadavers were used in this study. The deep tendon structure was located deep in the lower third of the superficial part of the masseter. It was observed in all specimens and was designated as a deep inferior tendon (DIT). The relationship between the masseter and DIT could be classified into three types according to the coverage pattern: Type A, in which areas IV and V were covered by the DIT (27%, 12/44); Type B, in which areas V and VI were covered by the DIT (23%, 10/44); and Type C, in which areas IV, V, and VI were covered by the DIT (50%, 22/44)...
December 30, 2016: Toxins
https://www.readbyqxmd.com/read/28042448/statistical-analysis-of-the-frequency-distribution-of-signs-and-symptoms-of-patients-with-temporomandibular-disorders
#8
R Franco, M Basili, A Venditti, C Chiaramonte, L Ottria, A Barlattani, P Bollero
The purpose of this text is to evaluate the distribution by sex and age of TMD patients and the frequency of pain on palpation of the lateral pterygoid muscle, pterygoid internal, sternocleidomastoid, masseter, temporal. The purpose is also to assess the existence of direct correlations between the articulating click and lateral deviation, the headache and tenderness of the temporal, the back pain and tenderness of the sternocleidomastoid, the postural disorders and difficulty finding the exact mating closing, the disorders related to previous dental procedures (large conservative reconstructions, rehabilitations fixed dentures and dental extractions) and tenderness to the temporal and masseter...
October 2016: Oral & Implantology
https://www.readbyqxmd.com/read/28035645/reflex-arc-of-the-teeth-clenching-induced-pressor-response-in-rats
#9
Ichiro Shoji, Takehito Kemuriyama, Megumi Tandai-Hiruma, Satoshi Maruyama, Akimasa Tashiro, Hidetaka Yokoe, Yasuhiro Nishida
Although "teeth clenching" induces pressor response, the reflex tracts of the response are unknown. In this study, dantrolene administration inhibited teeth clenching generated by electrical stimulation of the masseter muscles and completely abolished the pressor response. In addition, trigeminal ganglion block or hexamethonium administration completely abolished the pressor response. Local anesthesia of molar regions significantly reduced the pressor response to 27 ± 10%. Gadolinium (mechanoreceptor blocker of group III muscle afferents) entrapment in masticatory muscles also significantly reduced the pressor response to 62 ± 7%...
December 29, 2016: Journal of Physiological Sciences: JPS
https://www.readbyqxmd.com/read/28032152/revision-surgery-for-zygoma-reduction-causes-indications-solutions-and-results-from-a-5-year-review-of-341-cases
#10
Sang Woo Lee, Yeon Woo Jeong, Yujin Myung
BACKGROUND: Many patients undergo a revision surgery after malar reduction, which is one of the most popular aesthetic surgeries in Asia. We reviewed the leading causes of revision for malar reduction surgery to establish proper indications for revision, seek adequate surgical strategies, and share the results from revision surgical cases. METHODS: A retrospective review was conducted involving 341 patients who underwent malar reduction reoperation between March 2010 and June 2015...
December 28, 2016: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28026793/a-wireless-semg-based-body-machine-interface-for-assistive-technology-devices
#11
Cheikh Latyr Fall, Gabriel Gagnon-Turcotte, J F Dube, Jean Simon Gagne, Yanick Delisle, Alexandre Campeau-Lecours, Clement Gosselin, Benoit Gosselin
Assistive Technology (AT) tools and appliances are being more and more widely used and developed worldwide to improve the autonomy of people living with disabilities and ease the interaction with their environments. This paper describes an intuitive and wireless surface electromyography (sEMG) based body-machine interface for AT tools. Spinal cord injuries (SCIs) at C5-C8 levels affect patients' arms, forearms, hands and fingers control. Thus, using classical AT control interfaces (keypads, joysticks, etc.) is often difficult or impossible...
December 21, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28026014/characterization-of-the-nociceptive-effect-of-carrageenan-masseter-vs-gastrocnemius
#12
Ana Bagüés, M A Isabel Martín-Fontelles, Jesús Esteban-Hernández, Eva M A Sánchez-Robles
INTRODUCTION: To better understand the pathophysiology of chronic muscle pain, there are multiple animal models that mimic different acute/chronic pain conditions, such as carrageenan injection. Our previous studies demonstrate differences between muscles of different innervation in acute pain. Now, we characterize the effect of carrageenan in 2 muscles, masseter (trigeminal innervation) and gastrocnemius (spinal innervation). METHODS: Carrageenan (3,6, and 9%) was injected into the masseter and gastrocnemius of rats...
December 27, 2016: Muscle & Nerve
https://www.readbyqxmd.com/read/28008667/effect-of-a-brief-episode-of-experimental-muscle-pain-on-jaw-movement-and-jaw-muscle-activity-during-chewing
#13
Kyoko Inamoto, Greg M Murray, Terry Whittle
The aims of this study were to determine whether: (i) the jaw motor system develops a new pattern of jaw movement and/or jaw-muscle activity after resolution of an acute episode of jaw-muscle pain; and (ii) if jaw-muscle activity and jaw-movement features change progressively with repetition of a chewing sequence. Jaw movement and jaw muscle (masseter, anterior temporalis, and digastric) activity were recorded during free and rate-standardized chewing in eight asymptomatic participants (pain infusion group), before and at three time blocks up to 45 min after a single 0...
December 22, 2016: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/28008644/test-retest-reliability-of-quantitative-sensory-testing-for-mechanical-somatosensory-and-pain-modulation-assessment-of-masticatory-structures
#14
Yuri M Costa, Orlando Morita-Neto, Everardo N S de Araújo-Júnior, Fernanda A Sampaio, Paulo César R Conti, Leonardo R Bonjardim
BACKGROUND: Assessing the reliability of medical measurements is a crucial step toward the elaboration of an applicable clinical instrument. There are few studies that evaluate the reliability of somatosensory assessment and pain modulation of masticatory structures. OBJECTIVES: To estimate the test-retest reliability, i.e., over time, of the mechanical somatosensory assessment of anterior temporalis, masseter and temporomandibular joint (TMJ) and the conditioned pain modulation (CPM) using the anterior temporalis as the test site...
December 23, 2016: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28005811/the-role-of-percutaneous-radiofrequency-thermocoagulation-for-persistent-or-recurrent-trigeminal-neuralgia-after-surgery
#15
Pengfei Liu, Wenxiang Zhong, Chenlong Liao, Min Yang, Wenchuan Zhang
Therapeutic strategy is controversial and not yet uniform for patients with trigeminal neuralgia (TN) and persistent or recurrent facial pain after microvascular decompression, percutaneous radiofrequency thermocoagulation (PRT), or Gamma Knife surgery. The outcomes and risks of PRT for these patients are not clearly understood. The authors performed a retrospective study of 84 patients with persistent or recurrent TN after surgery who then underwent PRT between 2007 and 2013. Data were obtained with chart review and telephone interviews...
November 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28002447/influence-of-polymorphisms-in-the-htr3a-and-htr3b-genes-on-experimental-pain-and-the-effect-of-the-5-ht3-antagonist-granisetron
#16
Sofia Louca Jounger, Nikolaos Christidis, Britt Hedenberg-Magnusson, Thomas List, Peter Svensson, Martin Schalling, Malin Ernberg
The aim of this study was to investigate experimentally if 5-HT3 single nucleotide polymorphisms (SNP) contribute to pain perception and efficacy of the 5-HT3-antagonist granisetron and sex differences. Sixty healthy participants were genotyped regarding HTR3A (rs1062613) and HTR3B (rs1176744). First, pain was induced by bilateral hypertonic saline injections (HS, 5.5%, 0.2 mL) into the masseter muscles. Thirty min later the masseter muscle on one side was pretreated with 0.5 mL granisetron (1 mg/mL) and on the other side with 0...
2016: PloS One
https://www.readbyqxmd.com/read/28000406/zygomatic-root-position-in-recent-and-fossil-hominids
#17
Gerhard W Weber, Viktoria A Krenn
The relative position of the zygomatic root to the dentition plays a crucial role in determining the overall strength of the face in response to bite forces. The powerful superficial head of the masseter arises there and the zygomaticoalveolar crest (ZAC) is discussed as a buttressing feature of the face. For instance, a more forwardly or backwardly positioned zygomatic root or a lower or higher vertical distance to the dentition could be indicative for evolutionary adaptations to particular loading regimes which are associated with diet...
January 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28000400/biomechanical-evaluation-of-different-musculoskeletal-arrangements-in-psittacosaurus-and-implications-for-cranial-function
#18
Adam C Taylor, Stephan Lautenschlager, Zhao Qi, Emily J Rayfield
The masseter muscle complex is a unique feature of extant mammals and their advanced cynodont precursors, originating from the zygomatic arch and inserting onto the lateral surface of the dentary. This muscle complex is absent in sauropsids, with the exception of the neomorphic m. pseudomasseter complex that is unique to psittaciform birds (parrots and cockatiels). The anterior position and anterodorsally inclined line of action of both muscle groups increases leverage of the jaw and is thought to contribute to increased bite force, particularly in psittaciforms...
January 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28000397/evolution-of-the-jugal-zygomatic-bones
#19
Paul C Dechow, Qian Wang
This issue of the Anatomical Record is the second of a two-volume set on the zygoma (also called the cheek bone, the zygomatic bone, the malar, or the jugal, the latter term being used in vertebrates other than mammals). The zygoma is an important component of the craniofacial skeleton, in which the zygoma is a connection between the midfacial and the cranial skeletons; has a functional role as the origin of one of the masticatory muscles, the masseter muscle, and several facial muscles; has been considered as an essential buttress of the facial skeleton for resisting masticatory forces; and has importance for determining phylogenetic relationships...
January 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27996170/association-between-patterns-of-jaw-motor-activity-during-sleep-and-clinical-signs-and-symptoms-of-sleep-bruxism
#20
Yuya Yoshida, Takeshi Suganuma, Masayuki Takaba, Yasuhiro Ono, Yuka Abe, Shuichiro Yoshizawa, Takuro Sakai, Ayako Yoshizawa, Hirotaka Nakamura, Fusae Kawana, Kazuyoshi Baba
The aim of this study was to investigate the association between patterns of jaw motor activity during sleep and clinical signs and symptoms of sleep bruxism. A total of 35 university students and staff members participated in this study after providing informed consent. All participants were divided into either a sleep bruxism group (n = 21) or a control group (n = 14), based on the following clinical diagnostic criteria: (1) reports of tooth-grinding sounds for at least two nights a week during the preceding 6 months by their sleep partner; (2) presence of tooth attrition with exposed dentin; (3) reports of morning masticatory muscle fatigue or tenderness; and (4) presence of masseter muscle hypertrophy...
December 20, 2016: Journal of Sleep Research
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