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https://www.readbyqxmd.com/read/29782040/two-repetitive-bouts-of-intense-eccentric-concentric-jaw-exercises-reduce-experimental-muscle-pain-in-healthy-subjects
#1
Rosaria Bucci, Frank Lobbezoo, Ambrosina Michelotti, Michail Koutris
BACKGROUND: 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 minimize these detrimental effects. OBJECTIVE: 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...
May 21, 2018: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/29779827/zika-virus-report-from-the-task-force-on-tropical-diseases-by-the-world-federation-of-societies-of-intensive-and-critical-care-medicine
#2
Gisele Sampaio Silva, Guy A Richards, Tim Baker, Jorge Hidalgo, Juan Ignacio Silesky Jiménez, Pravin Amin
Zika fever is an acute infectious disease caused by the Zika virus (ZIKV), an RNA virus belonging to the genus Flavivirus. ZIKV can be transmitted by bites from Aedes aegypti and Aedes albopictus species, sexual activity, blood transfusion and from mother to fetus during pregnancy and delivery. A total of 50 territories and countries in the Americas had reported ZIKV infections. For those with symptoms, the presentation is similar to dengue fever with body aches, joint pain, fatigue, malaise, fever and conjunctivitis lasting up to seven days...
April 5, 2018: Journal of Critical Care
https://www.readbyqxmd.com/read/29768084/effect-of-phototherapy-on-masseter-and-anterior-temporal-muscles-before-induction-of-fatigue-a-randomized-sham-controlled-blind-clinical-trial
#3
Camila Haddad Leal de Godoy, Lara Jansiski Motta, Washington Steagall Júnior, Marcela Leticia Leal Gonçalves, Daniela Fátima Teixeira da Silva, Raquel Agnelli Mesquita-Ferrari, Aldo Brugnera Júnior, Sandra Kalil Bussadori
OBJECTIVE: This is a randomized, sham-controlled, blind clinical trial that aimed to evaluate the effect of phototherapy on bite force, mandibular range of motion, sensitivity to palpation, and fatigue in the masseter and anterior temporal muscles of young patients when administered before the induction of fatigue. MATERIALS AND METHODS: Fifty-two healthy volunteers aged 18-23 years were randomly allocated to a laser group and sham group. Both groups were submitted to a clinical evaluation to record mandibular range of motion, bite force, muscle sensitivity to palpation, and muscle fatigue...
May 16, 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29763362/fracture-strength-and-precision-of-fit-of-implant-retained-monolithic-zirconia-crowns
#4
Pauliina Moilanen, Jenni Hjerppe, Lippo Lassila, Timo Närhi
OBJECTIVES: To examine fracture strength and precision of fit of screw-retained anterior monolithic zirconia crowns made directly on implants or by cementing on prefabricated titanium bases, and to compare these to industrially produced Procera crowns. . MATERIALS AND METHODS: Monolithic screw-retained implant crowns were produced by CAD/CAM method (Zirkonzahn, Italy) using either partially (PSZ, Prettau, Zirconzahn, Italy) or fully stabilized (FSZ, Prettau Anterior, Zirkonzahn) zirconia...
May 15, 2018: Journal of Oral Implantology
https://www.readbyqxmd.com/read/29760900/personality-and-performance-are-affected-by-age-and-early-life-parameters-in-a-small-primate
#5
Pauline B Zablocki-Thomas, Anthony Herrel, Isabelle Hardy, Lucile Rabardel, Martine Perret, Fabienne Aujard, Emmanuelle Pouydebat
A whole suite of parameters is likely to influence the behavior and performance of individuals as adults, including correlations between phenotypic traits or an individual's developmental context. Here, we ask the question whether behavior and physical performance traits are correlated and how early life parameters such as birth weight, litter size, and growth can influence these traits as measured during adulthood. We studied 486 captive gray mouse lemurs ( Microcebus murinus ) and measured two behavioral traits and two performance traits potentially involved in two functions: exploration behavior with pull strength and agitation score with bite force...
May 2018: Ecology and Evolution
https://www.readbyqxmd.com/read/29755988/bite-forces-and-their-measurement-in-dogs-and-cats
#6
REVIEW
Se Eun Kim, Boaz Arzi, Tanya C Garcia, Frank J M Verstraete
Bite force is generated by the interaction of the masticatory muscles, the mandibles and maxillae, the temporomandibular joints (TMJs), and the teeth. Several methods to measure bite forces in dogs and cats have been described. Direct in vivo measurement of a bite in dogs has been done; however, bite forces were highly variable due to animal volition, situation, or specific measurement technique. Bite force has been measured in vivo from anesthetized dogs by electrical stimulation of jaw adductor muscles, but this may not be reflective of volitional bite force during natural activity...
2018: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/29744215/effects-of-gum-chewing-exercise-on-maximum-bite-force-according-to-facial-morphology
#7
Manami Shirai, Nobuhiko Kawai, Natsuko Hichijo, Masahiko Watanabe, Hiroyo Mori, Silvia Naomi Mitsui, Akihiro Yasue, Eiji Tanaka
Development of the masticatory system is influenced by functional needs. Furthermore, masticatory exercise can improve masticatory function. The aim of this study was to evaluate the potential effect of the gum chewing exercise on the maximum bite force (MBF) in adult subjects with different facial morphologies. MBF was measured by a portable occlusal force gauge and lateral cephalogram was used for evaluation of craniofacial morphology in 19 individuals (7 males and 12 females) with a mean age of 25.4 years (SD ± 4...
April 2018: Clinical and Experimental Dental Research
https://www.readbyqxmd.com/read/29706515/puncture-and-pull-biomechanics-in-the-teeth-of-predatory-coelurosaurian-dinosaurs
#8
Angelica Torices, Ryan Wilkinson, Victoria M Arbour, Jose Ignacio Ruiz-Omeñaca, Philip J Currie
The teeth of putatively carnivorous dinosaurs are often blade-shaped with well-defined serrated cutting edges (Figure 1). These ziphodont teeth are often easily differentiated based on the morphology and density of the denticles [1, 2]. A tearing function has been proposed for theropod denticles in general [3], but the functional significance of denticle phenotypic variation has received less attention. In particular, the unusual hooked denticles found in troodontids suggest a different feeding strategy or diet compared to other small theropods...
April 23, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29702550/chiropractic-manipulation-increases-maximal-bite-force-in-healthy-individuals
#9
Heidi Haavik, Mustafa Görkem Özyurt, Imran Khan Niazi, Kelly Holt, Rasmus Wiberg Nedergaard, Gizem Yilmaz, Kemal Sitki Türker
Recent research has shown that chiropractic spinal manipulation can alter central sensorimotor integration and motor cortical drive to human voluntary muscles of the upper and lower limb. The aim of this paper was to explore whether spinal manipulation could also influence maximal bite force. Twenty-eight people were divided into two groups of 14, one that received chiropractic care and one that received sham chiropractic care. All subjects were naive to chiropractic. Maximum bite force was assessed pre- and post-intervention and at 1-week follow up...
April 27, 2018: Brain Sciences
https://www.readbyqxmd.com/read/29697838/intraspecific-variation-in-the-information-content-of-an-ornament-why-relative-dewlap-size-signals-bite-force-in-some-but-not-all-island-populations-of-anolis-sagrei
#10
Simon Baeckens, Tess Driessens, Katleen Huyghe, Bieke Vanhooydonck, Raoul Van Damme
In many animals, male secondary sexual traits advertise reliable information on fighting capacity in a male-male context. The iconic sexual signaling device of anole lizards, the dewlap, has been extensively studied in this respect. For several territorial anole species (experiencing strong intrasexual selection), there is evidence for a positive association between dewlap size and bite capacity, which is an important determinant of combat outcome in lizards. Intriguingly, earlier studies did not find this expected correlation (relative dewlap size-relative bite force) in the highly territorial brown anole lizard, Anolis sagrei...
April 25, 2018: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/29687590/a-systematic-review-of-risk-of-hiv-transmission-through-biting-or-spitting-implications-for-policy
#11
F V Cresswell, J Ellis, J Hartley, C A Sabin, C Orkin, D R Churchill
OBJECTIVES: The perceived threat of HIV transmission through spitting and biting is evidenced by the increasing use of "spit hoods" by Police Forces in the UK. In addition, a draft parliamentary bill has called for increased penalties for assaults on emergency workers, citing the risk of communicable disease transmission as one justification. We aimed to review literature relating to the risk of HIV transmission through biting or spitting. METHODS: A systematic literature search was conducted using Medline, Embase and Northern Lights databases and conference websites using search terms relating to HIV, AIDS, bite, spit and saliva...
April 23, 2018: HIV Medicine
https://www.readbyqxmd.com/read/29663488/delayed-onset-muscle-soreness-in-human-masticatory-muscles-increases-inhibitory-jaw-reflex-responses
#12
Michail Koutris, Kemal S Türker, Maurits K A van Selms, Frank Lobbezoo
INTRODUCTION: The effects of masticatory muscles' overloading on jaw-motor control are not yet fully clarified. Therefore, it was tested whether eccentric and concentric exercises of the human masticatory muscles would influence inhibitory jaw-reflex responses. METHODS: 11 participants (6 males, 5 females) performed 6, 5-min bouts of eccentric-concentric contractions. Before, immediately after, 24 hours, 48 hours, and one week afterwards, visual analogue scale (VAS) scores for jaw-muscle fatigue and pain, maximum voluntary bite force (MVBF), and inhibitory jaw reflexes were recorded...
April 16, 2018: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/29619110/comparison-of-bite-force-with-locking-plates-versus-non-locking-plates-in-the-treatment-of-mandibular-fractures-a-meta-analysis
#13
REVIEW
José Cristiano Ramos Glória, Ighor Andrade Fernandes, Esmeralda Maria da Silveira, Glaciele Maria de Souza, Ricardo Lopes Rocha, Endi Lanza Galvão, Saulo Gabriel Moreira Falci
Introduction  Mandibular fractures represent a high percentage of all facial fractures, and the bite force is a fundamental parameter to measure the actual mandibular function and, subsequently, the masticatory efficiency and quality of life. Objectives  The purpose of the present systematic review was to verify if there is any difference in the bite forces of patients with mandibular fractures fixed by locking or non-locking plates, testing the null hypothesis of no difference in this parameter. Data Synthesis  A systematic review of the literature was conducted using four databases (PubMed, Virtual Health Library, Web of Science and Science Direct) without restrictions as to publication date or language...
April 2018: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/29618551/computer-simulations-show-that-neanderthal-facial-morphology-represents-adaptation-to-cold-and-high-energy-demands-but-not-heavy-biting
#14
Stephen Wroe, William C H Parr, Justin A Ledogar, Jason Bourke, Samuel P Evans, Luca Fiorenza, Stefano Benazzi, Jean-Jacques Hublin, Chris Stringer, Ottmar Kullmer, Michael Curry, Todd C Rae, Todd R Yokley
Three adaptive hypotheses have been forwarded to explain the distinctive Neanderthal face: (i) an improved ability to accommodate high anterior bite forces, (ii) more effective conditioning of cold and/or dry air and, (iii) adaptation to facilitate greater ventilatory demands. We test these hypotheses using three-dimensional models of Neanderthals, modern humans, and a close outgroup ( Homo heidelbergensis ), applying finite-element analysis (FEA) and computational fluid dynamics (CFD). This is the most comprehensive application of either approach applied to date and the first to include both...
April 11, 2018: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/29610777/effects-of-occlusal-modifications-on-the-muscular-activity-of-the-masseter-and-anterior-temporalis-muscles
#15
Alexandra Kravchenko-Oer, Mara Koch, Kristina Nöh, Charlott Osterman, Luzie Winkler, Bernd Kordaß, Sybille Hugger, Hans Jürgen Schindler, Alfons Hugger
The aim of this study was to analyze the effect of occlusal modifications on the muscular activity of the masseter and anterior temporalis muscles. The study included 41 healthy dentate subjects who were examined in relation to the muscle activity of the masseter and anterior temporalis muscles recorded by surface electromyography (EMG) bilaterally in two different sessions. Occlusal plastic strips (thickness: 0.4 or 0.8 mm) were placed on different mandibular teeth to simulate different bite constellations (unilateral, bilateral transversal, and bilateral diagonal)...
2018: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/29610620/evaluation-of-maximum-bite-force-in-patients-with-complete-dentures
#16
Kujtim Shala, Arlinda Tmava-Dragusha, Linda Dula, Teuta Pustina-Krasniqi, Teuta Bicaj, Enis Ahmedi, Zana Lila
OBJECTIVE: This study aimed to evaluate maximum bite forces (mBF) in dominant (DS) and non-dominant sides (NDS) at certain time periods after the insertion of new complete dentures based on prior experience and gender. MATERIALS AND METHODS: A total of 88 patients, complete denture wearers (CDWs), were examined. The maximum bite force at the intercuspal position between the first molars in 3 seconds was registered and recorded with piezoelectric gnathodynamometer...
March 15, 2018: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29606203/the-biting-performance-of-homo-sapiens-and-homo-heidelbergensis
#17
Ricardo Miguel Godinho, Laura C Fitton, Viviana Toro-Ibacache, Chris B Stringer, Rodrigo S Lacruz, Timothy G Bromage, Paul O'Higgins
Modern humans have smaller faces relative to Middle and Late Pleistocene members of the genus Homo. While facial reduction and differences in shape have been shown to increase biting efficiency in Homo sapiens relative to these hominins, facial size reduction has also been said to decrease our ability to resist masticatory loads. This study compares crania of Homo heidelbergensis and H. sapiens with respect to mechanical advantages of masticatory muscles, force production efficiency, strains experienced by the cranium and modes of deformation during simulated biting...
May 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29605190/fracture-strength-testing-of-crowns-made-of-cad-cam-composite-resins
#18
Ryota Okada, Masaki Asakura, Akihiro Ando, Hirokazu Kumano, Seiji Ban, Tatsushi Kawai, Jun Takebe
PURPOSE: The purpose of this study was to ascertain whether computer aided design/computer aided manufacturing (CAD/CAM) composite resin crowns have sufficient strength to withstand the bite force of the molar teeth. The null hypothesis was that the fracture strength of CAD/CAM composite resin crowns is lower than the average maximum bite force of the molar tooth. METHODS: The crowns, which shape is the right maxillary first molar, were fabricated using four CAD/CAM blanks made of composite resins (Block HC: HC, KZR-CAD HR: HR, KZR-CAD HR2: HR2, Avencia Block: AVE) and one CAD/CAM blank made of lithium disilicate glass-ceramic (IPS e...
March 28, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29599013/an-allometric-analysis-of-sexual-dimorphism-in-ctenomys-australis-integrating-classic-morphometry-and-functional-performance-in-vivo
#19
Matías Sebastián Mora, Federico Becerra, Aldo Iván Vassallo
The South American rodents of the genus Ctenomys (Rodentia, Hystricognathi), which use both forelimbs and incisors to dig, show strong, specialized morphological adaptations to living in the underground niche. In these rodents, the effectiveness of a bite - in this case the potential to inflict physical damage - mostly depends on the strength of the incisors (e.g. bending and torsion stresses) and the power of the masseteric muscle of the jaw. Ctenomys australis (the sand dune tuco-tuco) is a highly territorial subterranean rodent that builds large and exclusive burrow systems in coastal sand dunes found continuously along the Atlantic coast of the Buenos Aires province, Argentina...
February 21, 2018: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/29597061/individuality-of-masticatory-performance-and-of-masticatory-muscle-temporal-parameters
#20
Claire D Tewksbury, Kathryn X Callaghan, Brent A Fulks, Geoffrey E Gerstner
OBJECTIVE: Mammalian mastication serves to improve intra-oral food reduction. Insufficient food reduction creates potential swallowing problems, whereas over-reduction may accelerate tooth wear and increase feeding time. Either extreme has consequences. The study's objectives were: (1) to study the relationship between food reduction, number of chews in a sequence, and chewing rate, (2) to study how controlling the number of chews and chewing rate variability affects food reduction, and (3) to assess how dentoskeletal morphological and electromyographical (EMG) characteristics impact food reduction...
March 20, 2018: Archives of Oral Biology
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