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https://www.readbyqxmd.com/read/28420981/age-related-difference-in-functional-brain-connectivity-of-mastication
#1
Chia-Shu Lin, Ching-Yi Wu, Shih-Yun Wu, Hsiao-Han Lin, Dong-Hui Cheng, Wen-Liang Lo
The age-related decline in motor function is associated with changes in intrinsic brain signatures. Here, we investigated the functional connectivity (FC) associated with masticatory performance, a clinical index evaluating general masticatory function. Twenty-six older adults (OA) and 26 younger (YA) healthy adults were recruited and assessed using the masticatory performance index (MPI) and resting-state functional magnetic resonance imaging (rs-fMRI). We analyzed the rs-fMRI FC network related to mastication, which was constructed based on 12 bilateral mastication-related brain regions according to the literature...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28420043/-alcohol-consumption-prevalence-in-civil-servants
#2
Josep Maria Molina Aragonés, Cristina Abadia Castelló
Temporomandibular dysfunction syndrome (TMDS) includes a number of clinical conditions involving the temporomandibular joint (TMJ), the muscles involved in mastication, or both. The symptoms of TMDS include decreased mobility, masticatory muscle pain, TMJ pain, functional alteration accompanied by articular noises, myofascial pain or deviation of the mouth opening. Work with visual display terminals (VDTs) has become widespread in the past several years and the conditions associated with this type of work have been associated with the appearance of certain musculoskeletal pathologies...
April 2017: Archivos de Prevención de Riesgos Laborales
https://www.readbyqxmd.com/read/28416310/cracked-teeth-and-poor-oral-masticatory-habits-a-matched-case-control-study-in-china
#3
Feng Qiao, Min Chen, Xiaoli Hu, Kaijun Niu, Xu Zhang, Yanqiu Li, Zhou Wu, Zhengyan Shen, Ligeng Wu
INTRODUCTION: Previous studies have suggested that masticatory forces are associated with cracked teeth, but it is not clear which specific poor oral masticatory habits may be more likely to cause cracks. The aim of this study was to quantitatively assess risk factors for cracked teeth among poor oral masticatory habits and create a model for individualized risk predictions. METHODS: We enrolled 35 patients with cracked teeth matched to 70 controls without cracked teeth by age, sex, position of the affected tooth, presence/absence of systemic disease, and diagnosis of symptomatic irreversible pulpitis from the Stomatology Hospital of Tianjin Medical University, Tianjin, China...
April 14, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28408964/magnetic-resonance-and-sonographic-imagings-of-masticatory-muscle-myalgia-in-temporomandibular-disorder-patients
#4
REVIEW
Yoshiko Ariji, Eiichiro Ariji
This article reviews recently published studies investigating the MRI and sonographic diagnosis of masticatory muscle myalgia in temporomandibular disorder patients. The MRI and sonographic features of muscle after treatment are also discussed. Literature published within the last 15 years was obtained from the PubMed database using the following Mesh terms: magnetic resonance imaging (MRI) or sonography, masticatory muscle pain, and treatment. MRI and sonography enable accurate visualization and evaluation of the masticatory muscles, thereby increasing our understanding of pathology and cause of pain associated with these muscles...
February 2017: Japanese Dental Science Review
https://www.readbyqxmd.com/read/28408961/the-usefulness-of-diagnostic-imaging-for-the-assessment-of-pain-symptoms-in-temporomandibular-disorders
#5
REVIEW
Shigeaki Suenaga, Kunihiro Nagayama, Taisuke Nagasawa, Hiroko Indo, Hideyuki J Majima
The causes of pain symptoms in the temporomandibular joint (TMJ) and masticatory muscle (MM) regions may not be determined by clinical examination alone. In this review, we document that pain symptoms of the TMJ and MM regions in patients with temporomandibular disorders (TMDs) are associated with computed tomography and magnetic resonance (MR) findings of internal derangement, joint effusion, osteoarthritis, and bone marrow edema. However, it is emphasized that these imaging findings must not be regarded as the unique and dominant factors in defining TMJ pain...
November 2016: Japanese Dental Science Review
https://www.readbyqxmd.com/read/28408955/masticatory-muscle-tendon-aponeurosis-hyperplasia-a-new-clinical-entity-of-limited-mouth-opening
#6
REVIEW
Tsuyoshi Sato, Tetsuya Yoda
Limited mouth opening is a common health problem that interferes with eating, makes examination of the oral cavity difficult, and may increase the mortality rate during emergency intubation. Here we introduce a disease designated as masticatory muscle tendon-aponeurosis hyperplasia, which is a new clinical condition of limited mouth opening. Most oral surgeons and dentists are still unaware of this disease condition, thus increasing the risk of incorrect diagnosis as some other disease, such as temporomandibular joint disorder...
May 2016: Japanese Dental Science Review
https://www.readbyqxmd.com/read/28406127/masticatory-efficiency-of-shortened-dental-arch-subjects-with-removable-partial-denture-a-comparative-study
#7
J O Omo, M A Sede, T A Esan
OBJECTIVE: The objective of this study was to compare the masticatory efficiency in subjects with shortened dental arch (SDA) before and after restoration with removable partial denture (RPD). MATERIALS AND METHODS: This was a prospective study carried out on 36 consecutive patients. The subjects were asked to chew 5 g of a measured portion of fresh raw carrot for 20 specified numbers of strokes. The raw carrot was recovered into a cup and strained through a standard mesh sieve of 5 mm by 1 mm, it was air dried for 30 min and weighed with FEM digital series weighing scale...
April 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28403351/short-term-transcutaneous-electrical-nerve-stimulation-reduces-pain-and-improves-the-masticatory-muscle-activity-in-temporomandibular-disorder-patients-a-randomized-controlled-trial
#8
Ana Paula de Lima Ferreira, Dayse Regina Alves da Costa, Ana Izabela Sobral de Oliveira, Elyson Adam Nunes Carvalho, Paulo César Rodrigues Conti, Yuri Martins Costa, Leonardo Rigoldi Bonjardim
Objective: To investigate the short-term effect of transcutaneous electrical nerve stimulation (TENS) by examining pain intensity, pressure pain threshold (PPT) and electromyography (EMG) activity in patients with temporomandibular disorder (TMD). Material and Methods: Forty patients with myofascial TMD were enrolled in this randomized placebo-controlled trial and were divided into two groups: active (n=20) and placebo (n=20) TENS. Outcome variables assessed at baseline (T0), immediately after (T2) and 48 hours after treatment (T1) were: pain intensity with the aid of a visual analogue scale (VAS); PPT of masticatory and cervical structures; EMG activity during mandibular rest position (MR), maximal voluntary contraction (MVC) and habitual chewing (HC)...
March 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28398167/clinical-protocol-for-occlusal-adjustment-rationale-and-application
#9
Roger A Solow
BACKGROUND: Occlusal adjustment can optimize the result of orthodontics, orthognathic surgery, and comprehensive restoration, and resolve adverse forces to the dentition that affect the entire masticatory system. Mounted diagnostic casts and computerized occlusal analysis offer complementary advantages for evaluating occlusal problems. Predictable occlusal adjustment is facilitated by precise, measured documentation of occlusal force by computerized occlusal analysis. CLINICAL PRESENTATION: A conservative, structural correction of a pronounced, chronic occlusal problem by additive and subtractive occlusal adjustment was performed after a previous failed occlusal adjustment...
April 11, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28390760/restricted-mandibular-movement-attributed-to-ossification-of-mandibular-depressors-and-medial-pterygoid-muscles-in-patients-with-fibrodysplasia-ossificans-progressiva-a-report-of-3-cases
#10
Tetsuko Okuno, Hitoshi Suzuki, Akio Inoue, Jingo Kusukawa
Fibrodysplasia ossificans progressiva (FOP) is an extremely rare genetic condition characterized by congenital malformation and progressive heterotopic ossification (HO) caused by a recurrent single nucleotide substitution at position 617 in the ACVR1 gene. As the condition progresses, HO leads to joint ankylosis, breathing difficulties, and mouth-opening restriction, and it can shorten the patient's lifespan. This report describes 3 cases of FOP confirmed by genetic testing in patients with restricted mouth opening...
March 16, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28390304/effect-of-freezing-storage-time-on-the-elastic-and-viscous-properties-of-the-porcine-tmj-disc
#11
Jose L Calvo-Gallego, Maria S Commisso, Jaime Domínguez, Eiji Tanaka, Javier Martínez-Reina
The correct characterisation of the articular disc of the temporomandibular joint (TMJ) is key to study the masticatory biomechanics. For the interval from extraction until testing, freezing is the most used preservation technique for biological tissues, but its influence on their behaviour is still unclear. An important error can be committed in the characterisation of such tissues if freezing has any effect on their mechanical properties. Thus, the aim of this study was to determine whether the freezing storage time causes any change in the mechanical properties of the TMJ discs...
April 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28390128/masticatory-muscle-activity-evaluation-by-electromyography-in-subjects-with-zygomatic-implants
#12
M de Rossi, M Palinkas, B Lucas, C Santos, M Semprini, L Oliveira, I Regalo, E Bersani, R Miglioranca, S Siéssere, S Regalo
BACKGROUND: Zygomatic implants are an alternative treatment in the rehabilitation of atrophic maxilla to promote stability in the stomatognathic system. The aim of this study was to compare the electromyographic (EMG) activity of masseter and temporalis muscles in controls and in individuals with complete implant-supported dentures anchored in the zygomatic bone. MATERIALS AND METHODS: Fifty-four volunteers of both genders (mean age 52.5 years) were selected and distributed into two groups: Individuals with zygomatic implant (ZIG; n=27) and fully dentate patients (CG; n=27)...
April 8, 2017: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/28388822/toughness-of-the-virunga-mountain-gorilla-gorilla-beringei-beringei-diet-across-an-altitudinal-gradient
#13
Halszka Glowacka, Shannon C McFarlin, Erin R Vogel, Tara S Stoinski, Felix Ndagijimana, Deo Tuyisingize, Antoine Mudakikwa, Gary T Schwartz
The robust masticatory system of mountain gorillas is thought to have evolved for the comminution of tough vegetation, yet, compared to other primates, the toughness of the mountain gorilla diet is unremarkable. This may be a result of low plant toughness in the mountain gorilla environment or of mountain gorillas feeding selectively on low-toughness foods. The goal of this paper is to determine how the toughness of the mountain gorilla diet varies across their habitat, which spans a large altitudinal range, and whether there is a relationship between toughness and food selection by mountain gorillas...
April 7, 2017: American Journal of Primatology
https://www.readbyqxmd.com/read/28385436/influence-of-a-removable-prosthesis-on-oral-health-related-quality-of-life-and-mastication-in-elders-with-parkinson-disease
#14
Giselle R Ribeiro, Camila H Campos, Renata Cunha Matheus Rodrigues Garcia
STATEMENT OF PROBLEM: Parkinson disease (PD) symptoms, such as muscle rigidity, tremors in the lips and tongue, and involuntary mandibular movements, may cause oral health-related problems, mastication difficulties, and denture discomfort because of the difficulty in controlling a prosthesis with the oral musculature. PURPOSE: The purpose of this observational clinical study was to evaluate the influence of oral rehabilitation with a removable prosthesis on oral health-related quality of life (OHRQoL) and masticatory efficiency (ME) in elders with PD...
April 3, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28385103/effect-of-orthognathic-surgery-on-masticatory-performance-and-muscle-activity-in-skeletal-class-iii-patients
#15
Deniz Celakil, Fulya Ozdemir, Feyza Eraydin, Tamer Celakil
OBJECTIVE: To evaluate the effect of double jaw orthognathic surgery (OGS) on masticatory performance and electromyographic activity of the masseter and anterior temporal muscles in skeletal Class III patients. METHODS: Individuals were instructed to chew standardized round tablets of silicone impression material. The cumulative weight percentage was calculated using sieve analysis. The bilateral surface electromyographic activity of the muscles was evaluated. Following the orthodontic treatment, a stabilization splint was fabricated...
April 7, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28383131/the-hollow-maxillary-complete-denture-a-simple-precise-single-flask-technique-using-a-caramel-spacer
#16
Prem Bhushan, Meena A Aras, Vidya Chitre, Ashwin R Mysore, Kennedy Mascarenhas, Swati Kumar
The success of removable prostheses ultimately depends on a number of factors such as retention, stability, support, esthetics, and masticatory function. Increased intraoral inter-arch distance leads to an increase in the weight of the prosthesis. This may compromise the retention and resistance, which are key for a successful removable prosthesis. Various methods, techniques, and materials have been reported to minimize the weight of a prosthesis. This article describes a simple, unique, precise single-flask technique for the fabrication of a lightweight maxillary prosthesis using caramel as a 3D spacer, which was "indexed" to obtain a uniform thickness of acrylic around the hollow cavity...
April 6, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28381734/implant-supported-oral-rehabilitation-in-child-with-ectodermal-dysplasia-4-year-follow-up
#17
Thaisa Cezária Triches, Marcos Ximenes, João Gustavo Oliveira de Souza, Armando Rodrigues Lopes Pereira Neto, Antônio Carlos Cardoso, Michele Bolan
Ectodermal dysplasia (ED) is an anomaly determined by genetic factors that alter ectodermal structures such as skin, hair, nails, glands, and teeth. Children affected by this condition require extensive, comprehensive, and multidisciplinary treatment. An 8-year-old female patient visited the Dentistry Clinic of the Federal University of Santa Catarina with the chief complaint of multiple missing teeth. The mother reported that the patient had ED. Clinical and radiographic examination revealed the congenital absence of several primary and permanent teeth and tooth germs...
2017: Bulletin of Tokyo Dental College
https://www.readbyqxmd.com/read/28381731/efficiency-of-closed-mastication-of-gummy-evaluated-with-gnatho-hexagraph
#18
Chiharu Shima, Etsuko Motegi, Akiyo Horiuchi, Takenobu Ishii, Mayumi Nomura, Makoto Nakao, Kenji Sueishi
The aim of this study was to determine whether chewing with closed lips improved masticatory efficiency compared with open lips. A total of 21 adults comprising 10 men and 11 women with a mean age of 26.2±3.5 years and normal masticatory function were included in the study. The study participants were instructed to chew a fresh gummy under two conditions for 30 seconds each, one after the other: the first with closed lips, and the second with open lips. The average size of the fragmented gummies was calculated and graded from 1 to 4 according to a specific scale...
2017: Bulletin of Tokyo Dental College
https://www.readbyqxmd.com/read/28380201/study-of-the-kinematic-variables-of-unilateral-and-habitual-mastication-of-healthy-individuals
#19
Fernanda Pasinato, Andréia Gussi de Oliveira, Clarissa C Santos-Couto-Paz, Jorge Luis Lopes Zeredo, Geovana de Paula Bolzan, Sergio Bruzadelli Macedo, Eliane C R Corrêa
Purpose: To describe and compare the temporal-spatial kinematic variables of mandibular movement during deliberate unilateral and habitual mastication in healthy young-adult individuals. Methods: The study sample was composed of eight male healthy volunteers aged 19 to 24 years. The kinematic data were obtained using a motion analysis system - Qualisys Track Manager (QTM) ProReflex MCU. Recordings were performed during deliberate unilateral mastication (UM) and habitual mastication (HM) of firm-consistency gummy candy...
March 30, 2017: CoDAS
https://www.readbyqxmd.com/read/28377657/evaluation-of-masticatory-stimulation-effect-on-the-maxillary-transversal-growth-in-ectodermal-dysplasia-children
#20
Elia Sfeir, Mona G Nahass, Ayman Mourad
AIMS: Severe oligodontia is one of the most important symptoms in children with hypohidrotic ectodermal dysplasia (HED). The growth of the maxilla is a key consideration in restoring their mouth. The aim of this study was to evaluate the transversal maxillary sutural growth, after passive masticatory stimulation, in HED children. We also thought to assess the efficiency and functional outcome of the proposed propriocep-tive passive expansion (PPE) prosthetic device. MATERIALS AND METHODS: We studied 13 children (age 6-11 years) suffering from HED with severe oligodontia...
January 2017: International Journal of Clinical Pediatric Dentistry
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