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Bite force

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https://www.readbyqxmd.com/read/28931936/bite-force-in-the-horned-frog-ceratophrys-cranwelli-with-implications-for-extinct-giant-frogs
#1
A Kristopher Lappin, Sean C Wilcox, David J Moriarty, Stephanie A R Stoeppler, Susan E Evans, Marc E H Jones
Of the nearly 6,800 extant frog species, most have weak jaws that play only a minor role in prey capture. South American horned frogs (Ceratophrys) are a notable exception. Aggressive and able to consume vertebrates their own size, these "hopping heads" use a vice-like grip of their jaws to restrain and immobilize prey. Using a longitudinal experimental design, we quantified the ontogenetic profile of bite-force performance in post-metamorphic Ceratophrys cranwelli. Regression slopes indicate positive allometric scaling of bite force with reference to head and body size, results that concur with scaling patterns across a diversity of taxa, including fish and amniotes (lizards, tuatara, turtles, crocodylians, rodents)...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28913603/influence-of-anthropometry-tmd-and-sex-on-molar-bite-force-in-adolescents-with-and-without-orthodontic-needs
#2
Barbara de Lima Lucas, Taís de Souza Barbosa, Paula Midori Castelo, Maria Beatriz Duarte Gavião
PURPOSE: Bite force has been studied as representative of functional indices of mastication and its value may have diagnostic significance in disorders of the musculoskeletal system of facial bones. This study aimed to evaluate bite force in adolescents with and without orthodontic needs considering presence of temporomandibular disorders (TMD) as well as anthropometry: craniofacial dimensions and body mass index (BMI). METHODS: A total of 80 subjects were screened (61 females, 19 males; 18 ± 3 years old)...
September 14, 2017: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/28910468/estimation-of-dog-bite-risk-and-related-morbidity-among-personnel-working-with-military-dogs
#3
H Schermann, N Eiges, A Sabag, E Kazum, A Albagli, M Salai, A Shlaifer
BACKGROUND: Soldiers serving in the Israel Defense Force Military Working Dogs (MWD) Unit spend many hours taming dogs' special skills, taking them on combat missions, and performing various dogkeeping activities. During this intensive work with the aggressive military dogs, bites are common, and some of them result in permanent disability. However, this phenomenon has not been quantified or reported as an occupational hazard. METHODS: This was a retrospective cohort study based on self-administered questionnaires...
2017: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
https://www.readbyqxmd.com/read/28902864/comparative-skull-anatomy-of-terrestrial-and-crevice-dwelling-trachylepis-skinks-squamata-scincidae-with-a-survey-of-resources-in-scincid-cranial-osteology
#4
Daniel J Paluh, Aaron M Bauer
Skinks account for more than 25% of all lizard species; however, representatives of fewer than a quarter of all species have been characterized osteologically. All but a few of the available cranial descriptions concentrate solely on characters that can be seen externally on the intact skull. Mabuyid skinks of the genus Trachylepis are the dominant, fully limbed skinks in Sub-Saharan Africa, and nearly all species have the same generalized body plan. Although a few rock crevice-dwelling species possess slight body depression, extreme dorsoventral depression is observed only in Trachylepis laevis...
2017: PloS One
https://www.readbyqxmd.com/read/28891594/effect-of-telescopic-distal-extension-removable-partial-dentures-on-oral-health-related-quality-of-life-and-maximum-bite-force-a-preliminary-cross-over-study
#5
Moustafa Abdou Elsyad, Aisha Zakaria Mostafa
OBJECTIVES: This cross over study aimed to evaluate the effect of telescopic distal extension removable partial dentures on oral health related quality of life and maximum bite force MATERIALS AND METHODS: Twenty patients with complete maxillary edentulism and partially edentulous mandibles with anterior teeth only remaining were selected for this cross over study. All patients received complete maxillary dentures and mandibular partial removable dental prosthesis (PRDP, control). After 3 months of adaptation, PRDP was replaced with conventional telescopic partial dentures (TPD) or telescopic partial dentures with cantilevered extensions (TCPD) in a quasi-random method...
September 11, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28875081/the-jaw-is-a-second-class-lever-in-pedetes-capensis-rodentia-pedetidae
#6
Philip G Cox
The mammalian jaw is often modelled as a third-class lever for the purposes of biomechanical analyses, owing to the position of the resultant muscle force between the jaw joint and the teeth. However, it has been proposed that in some rodents the jaws operate as a second-class lever during distal molar bites, owing to the rostral position of the masticatory musculature. In particular, the infraorbital portion of the zygomatico-mandibularis (IOZM) has been suggested to be of major importance in converting the masticatory system from a third-class to a second-class lever...
2017: PeerJ
https://www.readbyqxmd.com/read/28869633/optimal-selection-of-dental-implant-for-different-bone-conditions-based-on-the-mechanical-response
#7
Sandipan Roy, Mainak DAS, Pratyaya Chakraborty, Jayanta Kumar Biswas, Subhomoy Chatterjee, Niloy Khutia, Subrata Saha, Amit Roy Chowdhury
PURPOSE: Bone quality varies from one patient to another extensively. Young's modulus may deviate up to 40% of normal bone quality, which results into alteration of bone stiffness immensely. The prime goal of this study is to design the optimum dental implant considering the mechanical response at bone implant interfaces for a patient with specific bone quality. METHOD: 3D models of mandible and natural molar tooth were prepared from CT scan data, while dental implants were modelled using different diameter, length and porosity and FE analysis was carried out...
2017: Acta of Bioengineering and Biomechanics
https://www.readbyqxmd.com/read/28867371/the-suture-retention-test-revisited-and-revised
#8
M Pensalfini, S Meneghello, V Lintas, K Bircher, A E Ehret, E Mazza
A systematic investigation of the factors affecting the suture retention test is performed. The specimen width w and the distance a of the suture bite from the specimen free edge emerge as the most influential geometrical parameters. A conservative approach for the quantification of suture retention strength is identified, based on the use of a camera to monitor the incipient failure and detect the instant of earliest crack propagation. The corresponding critical force, called break starting strength, is extremely robust against test parameter variations and its dependence on the specimen geometry becomes negligible when a≥ 2mm and w≥ 10mm...
August 24, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28862588/phantom-bite-a-real-or-a-phantom-diagnosis-a-case-report
#9
Ben A Sutter
This case report describes computer-guided occlusal therapy in a patient who met the unified diagnostic criteria for phantom bite. After a review of the patient's medical history, along with a diagnostic work-up that included cone beam computed tomography, temporomandibular joint vibration analysis, and digital occlusal analysis, problematic dental components were discovered (including prolonged disclusion time and imbalanced bite force). A digital occlusal analyzer evaluated the patient's occlusion and systematically guided the necessary changes...
September 2017: General Dentistry
https://www.readbyqxmd.com/read/28853166/masticatory-performance-related-factors-in-preschool-children-establishing-a-method-to-assess-masticatory-performance-in-preschool-children-using-colour-changeable-chewing-gum
#10
Yohei Hama, Akemi Hosoda, Yuriko Komagamine, Sachi Gotoh, Chieko Kubota, Manabu Kanazawa, Shunsuke Minakuchi
BACKGROUND: A knowledge gap regarding masticatory performance in preschool children exists, which in turn delays intervention for preventive care; therefore, a method to easily assess performance is needed. OBJECTIVE: To investigate the feasibility of assessing masticatory performance using colour-changeable chewing gum, and to investigate masticatory performance-related factors in preschool children. METHODS: This cross-sectional survey was conducted in two childcare facilities and our laboratory...
August 29, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28853161/jaw-sensorimotor-control-in-healthy-adults-and-effects-of-aging
#11
REVIEW
Limor Avivi-Arber, Barry J Sessle
The orofacial sensorimotor system is a unique system significantly distinguished from the spinal sensorimotor system. The jaw muscles are involved in mastication, swallowing and articulatory speech movements and their integration with respiration. These sensorimotor functions are vital for sustaining life and necessitate complex neuromuscular processing to provide for exquisite sensorimotor control of numerous orofacial muscles. The function of the jaw muscles in relation to sensorimotor control of these movements may be subject to aging-related declines...
August 29, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28841393/evaluation-of-fracture-resistance-of-varying-thicknesses-of-zirconia-around-implant-abutment-cylinders
#12
Cheryl Jonghee Park, Jin-Ho Phark, Winston Wanli Chee
Zirconia is becoming increasingly used as a restorative material for implant-supported restorations, however information is lacking with respect to the minimum thickness of zirconia surrounding the implant components. The purpose of this study is to evaluate the resistance to fracture of different thicknesses of zirconia luted to implant components. Thirty cylinders of zirconia (Prettau, Zirkonzahn) with 13 mm height, designed with indented occlusal surface for loading, and varying wall thicknesses (0.5 mm, 1 mm, 1...
August 25, 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28813570/experimental-and-numerical-characterization-of-the-mechanical-masseter-muscle-response-during-mastication
#13
Johannes Weickenmeier, Mahmood Jabareen, Benjamin J D Le Révérend, Marco Ramaioli, Edoardo Mazza
Predictive simulations of the mastication system would significantly improve our understanding of temporomandibular joint disorders and the planning of cranio-maxillofacial surgery procedures. Respective computational models must be validated by experimental data from in-vivo characterization of the mastication system's mechanical response. The present work introduces a combined experimental and numerical procedure for the validation of a computer model of the masseter muscle during biting. The proposed experimental setup enables simultaneous bite force measurements and ultrasound-based visualization of masseter deformation for the direct comparison with the numerically predicted masseter response...
August 16, 2017: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/28813431/skeleton-of-an-unusual-cat-sized-marsupial-relative-metatheria-marsupialiformes-from-the-middle-eocene-lutetian-44-43-million-years-ago-of-turkey
#14
A Murat Maga, Robin M D Beck
We describe a near-complete, three-dimensionally preserved skeleton of a metatherian (relative of modern marsupials) from the middle Eocene (Lutetian: 44-43 million years ago) Lülük member of the Uzunçarşıdere Formation, central Turkey. With an estimated body mass of 3-4 kg, about the size of a domestic cat (Felis catus) or spotted quoll (Dasyurus maculatus), it is an order of magnitude larger than the largest fossil metatherians previously known from the Cenozoic of the northern hemisphere. This new taxon is characterised by large, broad third premolars that probably represent adaptations for hard object feeding (durophagy), and its craniodental morphology suggests the capacity to generate high bite forces...
2017: PloS One
https://www.readbyqxmd.com/read/28810997/cutaneous-leishmaniasis-in-a-saudi-arabian-soldier-stationed-in-the-united-states
#15
Kelly Laurent, Jason Susong, Eric Fillman, Simon Ritchie
BACKGROUND: Leishmaniasis is a common parasitic disease seen in many parts of the world, especially in areas where current U.S. and international forces are deployed. Approximately 350 million people are thought to be at risk of cutaneous leishmaniasis (CL) with an annual incidence of 1.5 million cases. Over 90% of cutaneous infections with Leishmania occur in the Middle East, Brazil, and Peru. Outbreaks of CL may occur in military personnel deployed to endemic areas. Since the incubation period for symptomatic CL ranges from weeks to months, symptoms may not appear until well after returning to the United States...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28807935/function-of-the-hypobranchial-muscles-and-hyoidiomandibular-ligament-during-suction-capture-and-bite-processing-in-white-spotted-bamboo-sharks-chiloscyllium-plagiosum
#16
Jason B Ramsay, Cheryl D Wilga
Suction feeding in teleost fish is a power dependant behavior, requiring rapid and forceful expansion of the orobranchial cavity by the hypobranchial and trunk muscles. To increase power production for expansion, many species employ in-series tendons and catch mechanisms to store and release elastic strain energy. Suction feeding sharks such as Chiloscyllium plagiosum lack large in-series tendons on the hypobranchials, yet two of the hypobranchials, the coracohyoideus and coracoarcualis (CH, CA; hyoid depressors), are arranged in-series, and run deep and parallel to a third muscle, the coracomandibularis (CM, jaw depressor)...
August 14, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28797552/perforating-cervical-thoracic-and-abdominal-wounds
#17
REVIEW
Marije Risselada
Most body wall injuries in small animals are caused by bite wounds or vehicular trauma. Penetrating gunshot wounds are less common. Bite wounds are characterized by massive trauma to the body wall with associated defects, but fewer internal injuries, whereas gunshot wounds are associated with a high number of internal injuries. Vehicular accident injuries are caused by blunt force trauma and can lead to both body wall defects and internal organ damage. Impalement injuries are rare and are typically associated with internal damage...
August 7, 2017: Veterinary Clinics of North America. Small Animal Practice
https://www.readbyqxmd.com/read/28789647/evaluation-of-muscle-activity-bite-force-and-salivary-cortisol-in-children-with-bruxism-before-and-after-low-level-laser-applied-to-acupoints-study-protocol-for-a-randomised-controlled-trial
#18
RANDOMIZED CONTROLLED TRIAL
Mônica da Consolação Canuto Salgueiro, Carolina Carvalho Bortoletto, Anna Carolina RattoTempestini Horliana, Ana Carolina Costa Mota, Lara Jansiski Motta, Pamella de Barros Motta, Raquel Agnelli MesquitaFerrari, Kristianne Porta Santos Fernandes, Sandra Kalil Bussadori
BACKGROUND: Bruxism is a repetitive activity that causes tooth wear, audible sounds, and discomfort. Preventive measures have been studied for conditions that can exert a negative influence on physiological development in children. Low-level laser therapy administered over acupoints is an effective, painless, low-cost treatment option that has achieved good results. Thus, the aim of the proposed study is to evaluate changes in muscle activity, bite force and salivary cortisol in children with bruxism after the application of low-level laser to accupoints...
August 8, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28762591/ean-consensus-review-on-prevention-diagnosis-and-management-of-tick-borne-encephalitis
#19
REVIEW
P Taba, E Schmutzhard, P Forsberg, I Lutsar, U Ljøstad, Å Mygland, I Levchenko, F Strle, I Steiner
BACKGROUND AND PURPOSE: Tick-borne encephalitis (TBE) is an infection of the central nervous system (CNS) caused by tick-borne encephalitis virus (TBEV) and transmitted by ticks, with a variety of clinical manifestations. The incidence of TBE in Europe is increasing due to an extended season of the infection and the enlargement of endemic areas. Our objectives are to provide recommendations on the prevention, diagnosis and management of TBE, based on evidence or consensus decisions. METHODS: For systematic evaluation, the literature was searched from 1970 to 2015 (including early online publications of 2016), and recommendations were based on evidence or consensus decisions of the Task Force when evidence-based data were not available...
August 1, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28761274/comparative-evaluation-of-bite-force-analytical-study-following-mandibular-osteosysthesis-using-three-dimensional-and-conventional-locking-miniplates
#20
Pallav Kumar Kinra, K Jayakumar, C S Soumithran, Manoj Joseph Michael, Deepak Passi, Mahinder Singh
AIMS AND OBJECTIVES: The aim is to study the effectiveness of 2 mm three-dimensional (3D) titanium miniplates and 2 mm conventional titanium miniplates in osteosynthesis of mandibular fractures by comparing the change in bite force. METHODOLOGY: The study comprised forty patients of age group 20-40 years, weighing 55-75 kg having mandibular fractures. Patients were randomly divided into two equal groups In Group A, twenty patients underwent osteosynthesis using 3D titanium miniplates (2...
January 2017: National Journal of Maxillofacial Surgery
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