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Human bite force

Christopher J Beninati, Thomas R Katona
BACKGROUND: Some occlusal detection products are designed for use on dry teeth, but this is not always achieved. Others are suited for dry and wet applications. OBJECTIVE: The objective of this study is to assess the combined effects, on occlusal contact forces, of two previously studied affecting variables - occlusal detection products and saliva. METHODS: We used a full arch dentiform with 3 occlusal detection products (an articulating film, an articulation paper and T-Scan) in combination with human (HS) and an artificial saliva...
January 31, 2019: Journal of Oral Rehabilitation
Prashant Jindal, Frank Worcester, Kartikeya Walia, Anand Gupta, Philip Breedon
Titanium alloy based maxillofacial plates and implants are widely used in fracture treatment and reconstructions. Filler materials Graphene Nanoplatlets(GNPs) were used in a Titanium alloy maxillofacial plate and a Finite Element Model (FEM) was designed to reconstruct a fractured human mandible. Both 50N and 500N bite forces were applied on the mandible and stress distribution using Von mises failure theory across the plate sections was analyzed. A pure plate was critically stressed at a section near the mandible fracture region for a Von mises stress of nearly 27...
January 9, 2019: Computer Methods in Biomechanics and Biomedical Engineering
Guilherme F Mendes, Daniel R Stuginski, Selene M C Loibel, Karen de Morais-Zani, Marisa Maria T da Rocha, Wilson Fernandes, Sávio S Sant'Anna, Kathleen F Grego
Envenoming and deaths resulting from snakebites are a particularly important public health problem in rural tropical areas of Africa, Asia, Latin America and New Guinea. In 2015 The Lancet highlighted snake-bite envenoming as a neglected tropical disease and urged the world to increase antivenom production. In Brazil around 20,000 snakebites occur per year affecting mostly agricultural workers and children, of which 1% are caused by coral snakes (Micrurus sp). Although human envenoming by coral snakes are relatively rare due to their semifossorial habits and non-aggressive behavior, they are always considered severe due to the neurotoxic, myotoxic, hemorrhagic and cardiovascular actions of their venom, which is highly toxic when compared to the venom of other Brazilian venomous snakes as Bothrops sp (pit vipers), Crotalus sp (rattlesnakes) and Lachesis sp (bushmasters)...
December 12, 2018: Journal of Animal Science
Danilo Stefani Esposto, Marcelo Palinkas, Ligia Maria Napolitano Gonçalves, Paulo Batista de Vasconcelos, Vânia Tie Koga Ferreira, Elaine Caldeira de Oliveira Guirro, Selma Siéssere, Simone Cecilio Hallak Regalo
Breast cancer is the most common cancer affecting women in the world and provides functional changes in the human body. Evaluate women submitted to unilateral mastectomy, through electromyographic activity (mandibular rest, right and left laterality, protrusion, maximum voluntary contraction with and without Parafilm, habitual and non-habitual mastication) and thickness (rest and maximum voluntary contraction) of the right temporal muscle (RT), left temporal (LT), right masseter (RM) and left masseter (LM), also the molar bite force (right and left) and compare the data with healthy women...
July 2018: Brazilian Dental Journal
Li Ju-Lin, Zhu Guo-Ding, Zhou Hua-Yun, Tang Jian-Xia, Yang Meng-Meng, Wang Wei-Ming, Cao Jun
OBJECTIVE: To analyze the vector surveillance results during the stage of malaria elimination, so as to provide the evidence for assessing the local transmission risk of imported malaria and carrying out the surveillance work after malaria elimination in Jiangsu Province. METHODS: From 2011 to 2017, the mosquito population was monitored and human biting rates were calculated by the half overnight human baiting trapping method and overnight lamp trapping method in 7 surveillance sites from June to October...
August 15, 2018: Zhongguo Xue Xi Chong Bing Fang Zhi za Zhi, Chinese Journal of Schistosomiasis Control
Przemysław Stróżyk, Jacek Bałchanowski
A major stage in the preparation of a computational model of the human stomatognathic system is the determination of the values of the forces for the adopted loading configuration. In physiological conditions, food is a factor having a significant effect on the values of the loads acting on the stomatognathic system. Considering that the act of mastication is a complex process, this research undertook to determine the forces (bite forces, muscular forces and temporomandibular joint reaction forces) acting on the stomatognathic system during the dynamic symmetric incisal biting of selected foodstuffs...
August 10, 2018: Journal of Biomechanics
Neeta P Connally, Dominic A Rose, Nicole E Breuner, Robert Prose, Amy C Fleshman, Karen Thompson, Lisa Wolfe, Corey D Broeckling, Lars Eisen
Permethrin-treated clothing is available as consumer products to prevent bites by tick and insect pests. We used bioassays to examine the impact of wearing and washing/drying of permethrin-treated shirts, pants, and socks, and wearing of treated shoes, on their contact irritancy and toxicity for nymphal Ixodes scapularis Say (Acari: Ixodidae) ticks, the primary vectors in the eastern United States of the causative agents of Lyme disease, human anaplasmosis, and human babesiosis. Pristine permethrin-treated clothing displayed strong contact irritancy and toxicity toward I...
August 27, 2018: Journal of Medical Entomology
Juliette Di Francesco, Rithy Choeung, Borin Peng, Long Pring, Senglong Pang, Raphaël Duboz, Sivuth Ong, San Sorn, Arnaud Tarantola, Didier Fontenille, Veasna Duong, Philippe Dussart, Véronique Chevalier, Julien Cappelle
Japanese encephalitis is mainly considered a rural disease, but there is growing evidence of a peri-urban and urban transmission in several countries, including Cambodia. We, therefore, compared the epidemiologic dynamic of Japanese encephalitis between a rural and a peri-urban setting in Cambodia. We monitored two cohorts of 15 pigs and determined the force of infection-rate at which seronegative pigs become positive-in two study farms located in a peri-urban and rural area, respectively. We also studied the mosquito abundance and diversity in proximity of the pigs, as well as the host densities in both areas...
August 2018: PLoS Neglected Tropical Diseases
Bushra Malik, Terry Whittle, Toru Ogawa, Greg M Murray
The aims were to test the hypotheses that experimental masseter muscle pain leads to recruitment and/or derecruitment of motor units at different sites within the masseter and that the patterns of change in motor unit activity differ between sites. Single motor unit (SMU) activity was recorded at two sites within the right masseter [superior/anterior, inferior/posterior (IP)] during isometric biting tasks (ramp, step level) on an intraoral force transducer in 17 participants during three experimental blocks comprising no infusion (baseline), 5% hypertonic saline infusion (pain), or isotonic saline infusion (control)...
October 2018: European Journal of Oral Sciences
Isbel Sandoval, Polyana Moura Ferreira, Fabian Obregon, Terry Whittle, Greg M Murray
AIM: To determine if the electromyographic (EMG) activity of the left and right masseter and anterior temporalis muscles is altered by experimental right masseter muscle noxious stimulation during goal-directed isometric biting tasks in asymptomatic humans. METHODS: Isometric biting tasks (slow and fast ramp biting tasks, 2-step biting task) were performed on an intraoral force transducer in 18 participants during the following blocks: baseline block, hypertonic saline infusion into the right masseter muscle (painful block) and isotonic saline infusion into the right masseter (control block)...
July 19, 2018: Journal of Oral Rehabilitation
Sudhir Ramlal Pawar, Rajesh Ashok Kshirsagar, Pratik Hemantkumar Raut, Amod Pramod Patankar
Although leopards are found worldwide, the incidence of leopard attack on humans is reported most often from India and Nepal. Usually, leopards avoid contact with people, but humans may occasionally be targeted as prey. Animal bite wounds may express as punctures, abrasions, tears, or avulsions. The force and bluntness of the teeth increase the probability of a crush injury with devitalized tissue. The clinical presentation and appropriate treatment of infected bite wounds vary according to extent of the wound...
January 2018: National Journal of Maxillofacial Surgery
Eduardo I Faúndez
Bagrada hilaris is an invasive stink bug present in Asia, Africa, Europe, North America, and recently found in Chile, South America. Painted bug is well known as an agricultural pest, attacking mostly Brassicaceae. First records of the painted bug B. hilaris invading homes are given from Chile, from the Metropolitan, and Valparaiso Regions, including mild and heavily infested homes. In addition, the first case ever of an adventitious bite in a human being by this species is provided and described. Additionally, first alleged cases of occupational allergy are also mentioned...
August 29, 2018: Journal of Medical Entomology
Herzl Chai
Fossil teeth are a primary source for inferring species development via evolutionary adaptation due to their linkage to feeding ecology and well perseverance. The main working tools in such studies are bite force analysis derived from jaw musculature and lever arms and morphogenetic based on enamel thickness and occlusal surface area. Despite progress made, quantitative correlation between predictions and behavior is still lacking. We studied histological sections in varieties of extracted premolar and molar human teeth...
July 15, 2018: Acta Biomaterialia
David Ackland, Dale Robinson, Peter Vee Sin Lee, George Dimitroulis
BACKGROUND: Stock prosthetic temporomandibular joint replacements come in limited sizes, and do not always encompass the joint anatomy that presents clinically. The aims of this study were twofold. Firstly, to design a personalized prosthetic total joint replacement for the treatment of a patient's end-stage temporomandibular joint osteoarthritis, to implant the prosthesis into the patient, and assess clinical outcome 12-months post-operatively; and secondly, to evaluate the influence of changes in prosthetic condyle geometry on implant load response during mastication...
July 2018: Clinical Biomechanics
Robert Prose, Nicole E Breuner, Tammi L Johnson, Rebecca J Eisen, Lars Eisen
Clothing treated with the pyrethroid permethrin is available in the United States as consumer products to prevent tick bites. We used tick bioassays to quantify contact irritancy and toxicity of permethrin-treated clothing for three important tick vectors of human pathogens: the blacklegged tick, Ixodes scapularis Say (Acari: Ixodidae); the lone star tick, Amblyomma americanum (L.) (Acari: Ixodidae); and the American dog tick, Dermacentor variabilis (Say) (Acari: Ixodidae). We first demonstrated that field-collected I...
August 29, 2018: Journal of Medical Entomology
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
M Koutris, K S Türker, M K A van Selms, F Lobbezoo
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. Eleven participants (6 males, 5 females) performed 6, 5-minutes bouts of eccentric-concentric contractions. Before, immediately after, 24 hours, 48 hours and 1 week afterwards, visual analogue scale (VAS) scores for jaw muscle fatigue and pain, maximum voluntary bite force (MVBF) and inhibitory jaw reflexes were recorded...
June 2018: Journal of Oral Rehabilitation
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
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
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
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