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Joseph Catapano, Daniel R B Demsey, Emily S Ho, Ronald M Zuker, Gregory H Borschel
Smiling is an important aspect of emotional expression and social interaction, leaving facial palsy patients with impaired social functioning and decreased overall quality of life. Although there are several techniques available for facial reanimation, staged facial reanimation using donor nerve branches from the contralateral, functioning facial nerve connected to a cross-face nerve graft (CFNG) is the only technique that can reliably reproduce an emotionally spontaneous smile. Although CFNGs provide spontaneity, they typically produce less smile excursion than when the subsequent free functioning muscle flap is innervated with the motor nerve to the masseter muscle...
September 2016: Plastic and Reconstructive Surgery. Global Open
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...
October 14, 2016: Journal of Craniofacial Surgery
W Pérez, N Vazquez, R Ungerfeld
The aims of this study were to describe the anatomy of the mouth and pharynx of the pampas deer, and to consider its evolutionary feeding niche according to those characteristics. Gross dissections of the mouth and pharynx were performed in 15 animals, 10 adult females and five young animals under 1 year (three males and two females), all dead by causes unrelated to this anatomical region. The upper lip entered in the constitution of a pigmented nasolabial plane. The masseter muscles weighed 43.8 ± 3.5 g and represented 0...
October 17, 2016: Anatomia, Histologia, Embryologia
Ahmed M Abdelhamid, Kenda I Hanno, Mohamed H Imam
BACKGROUND: The purpose of this prospective cross-over study is to evaluate the effect of bilateral balanced occlusion and canine guidance occlusion on the masseter muscle activity using implant-retained mandibular overdentures. METHODS: After evaluation of 12 completely edentulous patients using cone beam computed tomography (CBCT), mucoperiosteal flaps were reflected exposing the mandibular interforaminal region. Two implants were placed in the interforaminal region for each of the 12 patients...
December 2015: Int J Implant Dent
Yukihiko Okada, Yuji Sato, Noboru Kitagawa, Keiichiro Uchida, Tokiko Osawa, Yoshiki Imamura, Mayumi Terazawa
BACKGROUND: Occlusal contact on the implant superstructures is important for successful treatment. The purpose of this study was to investigate the occlusal contact of single implant superstructures at the mandibular first molar immediately after seating from weak to strong clenching. METHODS: Subjects were nine patients who had just been fitted with an implant prosthesis in the mandibular first molar region, with no missing teeth other than in the implant region...
December 2015: Int J Implant Dent
Shunichi Suzuki, Eduardo Enrique Castrillon-Watanabe, Taro Arima, Yoshimasa Kitagawa, Peter Svensson
BACKGROUND: Myofascial pain associated with temporomandibular disorders has often been linked to pathological muscle hyperactivity. As a result, localized disturbances of intramuscular blood flow could lead to a lower level of oxygen distribution, hypoxia and microcirculatory changes. AIM: To assess hemodynamic changes in the masseter muscle during sustained elevated muscle activity (SEMA). MATERIALS AND METHODS: Sixteen healthy participants performed thirty 1-minute bouts of SEMA with intervals of 1-minute "rest" periods between the bouts on a bite force transducer device...
October 15, 2016: Journal of Oral Rehabilitation
Fernanda Pasinato, Clarissa C Santos-Couto-Paz, Jorge Luis Lopes Zeredo, Sergio Bruzadelli Macedo, Eliane C R Corrêa
The aim of this study was to verify the effects of induced masseter-muscle pain on the amplitude of muscle activation, symmetry and coactivation of jaw- and neck-muscles during mastication. Twenty-eight male volunteers, mean age±SD 20.6±2.0years, participated in this study. Surface electromyography of the masseter and sternocleidomastoid (SCM) muscles was performed bilaterally during mastication of a gummy candy before and after injections of monosodium glutamate solution and isotonic saline solution. As a result, we observed a decrease in the amplitude of activation of the masseter muscle on the working side (p=0...
September 28, 2016: Journal of Electromyography and Kinesiology
Chandrashekhar R Bande, Akshay Mishra, M K Gupta, Manu Goel, Mayur J Gawande
PURPOSE: Resections in the posterior component of the oral cavity usually lead to severe functional compromise and lower quality of life for patients. Notable advances in reconstruction of the posterior part of the mouth and of the oropharynx have occurred in recent decades. The anatomic and physiologic rehabilitation of the defect to a reasonable outcome with low morbidity and mortality remains the founding basis of any surgical reconstruction, which also holds true for oral oropharyngeal and retromaxillary reconstructions...
September 17, 2016: Journal of Oral and Maxillofacial Surgery
Eliane H Dutra, Mara H O' Brien, Alexandro Lima, Zana Kalajzic, Aditya Tadinada, Ravindra Nanda, Sumit Yadav
OBJECTIVES: To evaluate the cellular and matrix effects of botulinum toxin type A (Botox) on mandibular condylar cartilage (MCC) and subchondral bone. MATERIALS AND METHODS: Botox (0.3 unit) was injected into the right masseter of 5-week-old transgenic mice (Col10a1-RFPcherry) at day 1. Left side masseter was used as intra-animal control. The following bone labels were intraperitoneally injected: calcein at day 7, alizarin red at day 14 and calcein at day 21. In addition, EdU was injected 48 and 24 hours before sacrifice...
2016: PloS One
Sunki Rhee, Masahito Yamamoto, Kei Kitamura, Kasahara Masaaki, Yukio Katori, Gen Murakami, Shin-Ichi Abe
Macrophages play an important role in aging-related muscle atrophy (i.e., sarcopenia). We examined macrophage density in six striated muscles (cricopharyngeus muscle, posterior cricoarytenoideus muscle, genioglossus muscle, masseter muscle, infraspinatus muscle, and external anal sphincter). We examined 14 donated male cadavers and utilized CD68 immunohistochemistry to clarify macrophage density in muscles. The numbers of macrophages per striated muscle fiber in the larynx and pharynx (0.34 and 0.31) were 5-6 times greater than those in the tongue, shoulder, and anus (0...
September 2016: Anatomy & Cell Biology
Hiroshi Endo, Shuichi Ino, Waka Fujisaki
Elderly individuals whose ability to chew and swallow has declined are often restricted to unpleasant diets of very soft food, leading to a poor appetite. To address this problem, we aimed to investigate the influence of altered auditory input of chewing sounds on the perception of food texture. The modified chewing sound was reported to influence the perception of food texture in normal foods. We investigated whether the perceived sensations of nursing care foods could be altered by providing altered auditory feedback of chewing sounds, even if the actual food texture is dull...
October 5, 2016: Physiology & Behavior
Michail Koutris, Kemal S Türker, Jacobus J van der Weijden, Maurits K A van Selms, Frank Lobbezoo
BACKGROUND: For the analysis of inhibitory reflexes, no consensus exists regarding the methodology that should be used. The most commonly used methods are the cumulative sum (CUSUM) error box and the t-test. The aim of this study was to assess the interexaminer reliability of those two analyzing methods and to test whether both methods: yield similar results. METHODS: Inhibitory jaw reflexes were recorded from the right masseter muscle of 11 participants (6 males, 5 females)...
October 4, 2016: Journal of Neuroscience Methods
Hideyuki Nukaga, Tomotaka Takeda, Kazunori Nakajima, Keishiro Narimatsu, Takamitsu Ozawa, Keiichi Ishigami, Kazuo Funato
Teeth clenching has been shown to improve remote muscle activity (by augmentation of the Hoffmann reflex), and joint fixation (by decreased reciprocal inhibition) in the entire body. Clenching could help maintain balance, improve systemic function, and enhance safety. Teeth clenching from a sports dentistry viewpoint was thought to be important and challenging. Therefore, it is quite important to investigate mastication muscles' activity and function during sports events for clarifying a physiological role of the mastication muscle itself and involvement of mastication muscle function in whole body movement...
2016: Open Dentistry Journal
Gabriel Masset, Kevin C Mathias, Antonis Vlassopoulos, Famke Mölenberg, Undine Lehmann, Mike Gibney, Adam Drewnowski
BACKGROUND AND OBJECTIVE: Approximately 20% of US children and adolescents consume pizza on any given day; and pizza intake is associated with higher intakes of energy, sodium, and saturated fat. The reformulation of pizza products has yet to be evaluated as a viable option to improve diets of the US youth. This study modeled the effect on nutrient intakes of two potential pizza reformulation strategies based on the standards established by the Nestlé Nutritional Profiling System (NNPS)...
2016: PloS One
Man-Kyo Chung, Jennifer Park, Jamila Asgar, Jin Y Ro
BACKGROUND: Chronic pain in masticatory muscles is a major medical problem. Although mechanisms underlying persistent pain in masticatory muscles are not fully understood, sensitization of nociceptive primary afferents following muscle inflammation or injury contributes to muscle hyperalgesia. It is well known that craniofacial muscle injury or inflammation induces regulation of multiple genes in trigeminal ganglia, which is associated with muscle hyperalgesia. However, overall transcriptional profiles within trigeminal ganglia following masseter inflammation have not yet been determined...
2016: Molecular Pain
Paloma María Blasco-Bonora, Aitor Martín-Pintado-Zugasti
OBJECTIVES: To investigate the effects of deep dry needling (DN) of myofascial trigger points (MTrPs) of the masseter and temporalis on pain, pressure pain threshold (PPT), pain-free maximal jaw opening and temporomandibular disorder (TMD)-related disability in patients with sleep bruxism (SB) and myofascial TMD. METHODS: Seventeen subjects (11 women, 6 men) aged 39±13 years (range 23-66) diagnosed with SB and myofascial TMD were invited to participate in this prospective case series study...
October 3, 2016: Acupuncture in Medicine: Journal of the British Medical Acupuncture Society
Ute Ulrike Botzenhart, Constantin Wegenstein, Teodor Todorov, Christiane Kunert-Keil
The most widespread animal model to investigate Duchenne muscular dystrophy is the mdx-mouse. In contrast to humans, phases of muscle degeneration are replaced by regeneration processes; hence there is only a restricted time slot for research. The aim of the study was to investigate if an intramuscular injection of BTX-A is able to break down muscle regeneration and has direct implications on the gene expression of myosin heavy chains in the corresponding treated and untreated muscles. Therefore, paralysis of the right masseter muscle was induced in adult healthy and dystrophic mice by a specific intramuscular injection of BTX-A...
2016: BioMed Research International
Andréa Cavalcante Dos Santos, Carlos Antonio Bruno da Silva
Background: Surface electromyography identifies changes in the electrical potential of the muscles during each contraction. The percentage of use is a way to treat values enabling comparison between groups. Aim: To analyze the electrical activity and the percentage of use of masseter and temporal muscles during chewing in candidates for gastric bypass. Methods: It was used Surface Electromyography Miotool 200,400 (Miotec (r), Porto Alegre/RS, Brazil) integrated with Miograph 2...
2016: Arquivos Brasileiros de Cirurgia Digestiva: ABCD, Brazilian Archives of Digestive Surgery
Miriam Yumi Matsui, Lilian Chrystiane Giannasi, Sandra Regina Freitas Batista, Jose Benedito Oliveira Amorim, Claudia S Oliveira, Luis Vicente F Oliveira, Monica Fernandes Gomes
OBJECTIVE: The aim of the present study was to compare the electromyographic activity of masticatory muscles of adult patients with different degrees of oral motor impairment (cerebral palsy) with the electromyographic activity of healthy individuals in a control group. Electromyographic activity was compared when the masticatory muscles were at rest and in motion. DESIGN: Thirty adult patients with cerebral palsy and 30 subjects without neuromotor disorders were enrolled in the present study...
September 1, 2016: Archives of Oral Biology
Georgios Koutsis, Panagiotis Kokotis, Aikaterini E Papagianni, Maria-Eleftheria Evangelopoulos, Constantinos Kilidireas, Nikolaos Karandreas
OBJECTIVE: To integrate neurophysiological findings with clinical and imaging data in a consecutive series of multiple sclerosis (MS) patients developing facial numbness during the course of an MS attack. METHODS: Nine consecutive patients with MS and recent-onset facial numbness were studied clinically, imaged with routine MRI, and assessed neurophysiologically with trigeminal somatosensory evoked potential (TSEP), blink reflex (BR), masseter reflex (MR), facial nerve conduction, facial muscle and masseter EMG studies...
September 2016: Multiple Sclerosis and related Disorders
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