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https://www.readbyqxmd.com/read/28520860/growing-patients-with-duchenne-muscular-dystrophy-longitudinal-changes-in-their-dentofacial-morphology-and-orofacial-functional-capacities
#1
Fabienne Egli, Sébastien Botteron, Catherine Morel, Stavros Kiliaridis
Aim: The aim of this study was to describe the longitudinal changes in facial morphology, dental arch alterations and oral functional capacities that occur in growing patients with Duchenne muscular dystrophy (DMD) in order to identify the effects of the progression of the disease. Subjects and Methods: Twelve DMD patients (6.5-17.5 years of age) and 12 matched controls were screened on two different occasions (T1 and T2), 2 years apart. Dental casts, lateral cephalometric radiographs, maximal posterior bite force and labial force were measured to determine changes in their functional capacities and dentofacial morphology...
May 17, 2017: European Journal of Orthodontics
https://www.readbyqxmd.com/read/28515439/the-biomechanics-behind-extreme-osteophagy-in-tyrannosaurus-rex
#2
Paul M Gignac, Gregory M Erickson
Most carnivorous mammals can pulverize skeletal elements by generating tooth pressures between occluding teeth that exceed cortical bone shear strength, thereby permitting access to marrow and phosphatic salts. Conversely, carnivorous reptiles have non-occluding dentitions that engender negligible bone damage during feeding. As a result, most reptilian predators can only consume bones in their entirety. Nevertheless, North American tyrannosaurids, including the giant (13 metres [m]) theropod dinosaur Tyrannosaurus rex stand out for habitually biting deeply into bones, pulverizing and digesting them...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28493384/risk-factors-for-single-crowns-supported-by-short-6-mm-implants-in-the-posterior-region-a-prospective-clinical-and-radiographic-study
#3
Eduardo Aydos Villarinho, Diego Fernandes Triches, Fernando Rizzo Alonso, Luis André Mendonça Mezzomo, Eduardo Rolim Teixeira, Rosemary Sadami Arai Shinkai
BACKGROUND: The use of short implants is still not a consensus for challenging clinical situations, such as unfavorable crown-to-implant (C/I) ratio. PURPOSE: This prospective study evaluated the rates of prosthetic complications and implant failure, the mean marginal bone loss of 6-mm dental implants with single crowns in posterior regions and the potential risk factors. MATERIALS AND METHODS: Forty-six dental implants, 6-mm long and 4.1-mm wide, were placed in the posterior region in 20 patients...
May 10, 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28485615/changes-in-occlusal-function-after-extraction-of-premolars-2-year-follow-up
#4
Wookang Yoon, Soonshin Hwang, Chooryung Chung, Kyung-Ho Kim
OBJECTIVE: To determine the effects of extraction and the number of teeth extracted on changes in occlusal function by measuring occlusal contact area and force before and after orthodontic treatment with a fixed appliance. MATERIALS AND METHODS: Female patients treated with a fixed appliance were divided into nonextraction (n = 36), two maxillary premolar extraction (n = 31), and four premolar extraction (n = 18) groups. Bite pressure-sensitive films were used to analyze the occlusal contact area and force...
May 9, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28449265/a-pilot-study-of-nocturnal-temporalis-muscle-activity-in-tmd-diagnostic-groups-of-women
#5
F Wei, M H Van Horn, M C Coombs, X She, T S Gonzales, Y M Gonzalez, J M Scott, L R Iwasaki, J C Nickel, H Yao
Temporomandibular disorder (TMD) incidences are believed to be related to parafunctional behaviours like teeth clenching. This pilot study aimed to (i) develop an automated clench-detection algorithm, and (ii) apply the algorithm to test for differences in nocturnal clenching in women with and without TMD. Subjects gave informed consent to participate. Adult women were categorised using Diagnostic Criteria for TMD according to presence/absence (+/-) of both TM joint disc placement (DD) and chronic pain (P) into two groups (+DD+P, -DD-P) with 12 subjects each...
April 27, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28425479/perturbed-oral-motor-control-due-to-anesthesia-during-intraoral-manipulation-of-food
#6
Joannis Grigoriadis, Abhishek Kumar, Peter Svensson, Krister G Svensson, Mats Trulsson
Sensory information from periodontal mechanoreceptors (PMRs) surrounding the roots of natural teeth is important for optimizing the positioning of food and adjustment of force vectors during precision biting. The present experiment was designed to test the hypothesis; that reduction of afferent inputs from the PMRs, by anesthesia, perturbs the oral fine motor control and related jaw movements during intraoral manipulation of morsels of food. Thirty healthy volunteers with a natural dentition were equally divided into experimental and control groups...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28416880/frying-of-rice-flour-dough-strands-containing-gum-arabic-texture-sensory-attributes-and-microstructure-of-products
#7
J Shanthilal, Suvendu Bhattacharya
The effects of rice flour (50-56%, w/w) and gum Arabic (0-5%, w/w) on the physical, sensory and structural features of the fried dough strands were investigated. Up to 25.8% reduction in oil was possible by the incorporation of gum Arabic. The wide variations in failure force (13.8-25.3 N) and failure strain (11.0-28.6%) indicated the formation of snacks varying in texture from a soft-to-bite brittle product to a hard-to-eat less brittle sample. The snacks possessed a porous microstructure with air cells, pores and vacuoles; the cell walls were more than 100 μm in thickness...
April 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28414608/mechanobehavioral-scores-in-women-with-and-without-tmj-disc-displacement
#8
L R Iwasaki, Y M Gonzalez, Y Liu, H Liu, M Markova, L M Gallo, J C Nickel
Cartilage fatigue may be a factor in the precocious development of degenerative changes in the temporomandibular joint (TMJ). This cross-sectional study estimated potential for cartilage fatigue via TMJ energy densities (ED) and jaw muscle duty factors (DF), which were combined to calculate mechanobehavioral scores (MBS) in women with (+) and without (-) bilateral TMJ disc displacement (DD). All subjects gave informed consent to participate and were examined using Diagnostic Criteria (DC) for Temporomandibular Disorders (TMD) and magnetic resonance (MR) and computed tomography (CT) images...
April 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28406404/risk-of-daytime-transmission-of-malaria-in-the-french-guiana-rain-forest
#9
V Pommier de Santi, I Dusfour, E de Parseval, B Lespinet, C Nguyen, P Gaborit, R Carinci, G Hyvert, R Girod, S Briolant
Between 2008 and 2014, there were 1070 malaria cases reported in French Guiana among members of the armed forces. Most of the malaria outbreaks investigated were multifactorial and followed missions conducted at illegal gold mining sites. For example, a malaria outbreak occurred in September 2013, three weeks after the deployment of 15 soldiers at Dagobert, which is such a site. The attack rate was 53%, with seven Plasmodium vivax infections and one coinfection with both Plasmodium vivax and Plasmodium falciparum...
February 1, 2017: Médecine et Santé Tropicales
https://www.readbyqxmd.com/read/28398167/clinical-protocol-for-occlusal-adjustment-rationale-and-application
#10
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/28385591/optimal-control-problems-of-mosquito-borne-disease-subject-to-changes-in-feeding-behavior-of-aedes-mosquitoes
#11
M A Masud, Byul Nim Kim, Yongkuk Kim
Dengue viruses (DENV) are transmitted to humans by the bite of Aedes mosquitoes. It is known that dengue virus infection in Aedes aegypti female mosquitoes makes a change in the feeding behavior of the infected mosquitoes. In this study, using the forces of infection, we incorporated the effect of changes in the feeding behavior of mosquitoes into the standard vector-borne SIR-SI model. It has been proved that both a single-strain model and a two-strain model exhibit forward bifurcations. Moreover, optimal implementations of control with specific prevention measures for dengue transmission are analyzed...
April 3, 2017: Bio Systems
https://www.readbyqxmd.com/read/28374262/what-is-play-fighting-and-what-is-it-good-for
#12
Sergio M Pellis, Vivien C Pellis
Play fighting is a common form of play reported among species of mammals, birds, and some other taxa. The competition present in play fighting revolves around gaining some advantage, such as biting a partner without being bitten. The behavior simulated during play fighting need not be restricted to that present in adult serious fighting, but can involve competitive interactions derived from amicable behavior, such as sex and social grooming, or from nonsocial competition, such as predation. What unifies play fighting, irrespective of the functional behavior being simulated, is that it involves some degree of reciprocity, or turn taking, that requires that the competition be attenuated by cooperation...
April 3, 2017: Learning & Behavior
https://www.readbyqxmd.com/read/28363902/ontogeny-of-bite-force-in-a-validated-biomechanical-model-of-the-american-alligator
#13
Kaleb C Sellers, Kevin M Middleton, Julian L Davis, Casey M Holliday
Three-dimensional computational modeling offers tools with which to investigate forces experienced by the skull encountered during feeding and other behaviors. American alligators (Alligator mississippiensis) generate some of the highest measured bite forces among extant tetrapods. A concomitant increase in bite force accompanies ontogenetic increases in body mass, which has been linked with dietary changes as animals increase in size. Because the flattened skull of crocodylians has substantial mediolaterally-oriented muscles, they are an excellent model taxon in which to explore the role of mediolateral force components experienced by the feeding apparatus...
March 31, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28359663/higher-maximal-occlusal-bite-force-in-endodontically-treated-teeth-versus-vital-contralateral-counterparts
#14
Lama Awawdeh, Khalid Hemaidat, Wael Al-Omari
INTRODUCTION: Decreased sensitivity to occlusal load could lead to a greater risk of damage to endodontically treated teeth. Therefore, this study aims to test whether root canal treatment reduces the sensitivity of the treated teeth to occlusal load. METHODS: This is a comparative cross-sectional study of 124 patients who received root canal treatment. Treated teeth were compared with vital teeth on the contralateral side. After interviews with participants, their maximal bite forces (MBFs) of their root canal-treated and contralateral untreated teeth were measured using a digital bite fork force transducer...
March 28, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28327073/the-influence-of-axial-grooves-on-dislodgment-resistance-of-prosthetic-metal-crowns-in-canine-teeth-of-dogs
#15
Stephanie Goldschmidt, Caitlyn J Collins, Scott Hetzel, Heidi-Lynn Ploeg, Jason W Soukup
The reported failure rate for full veneer crowns of canine teeth of dogs is suboptimal, particularly in teeth with naturally poor retentive features, such as those with low height/diameter (H/D) ratios or high convergence angles (CAs). The objective of the present study was to evaluate the application of axial grooves in an effort to develop a crown preparation design that enhances the retention of full veneer crowns in dogs. Crown dislodgment testing was performed on cast alloy dies of canine teeth with unfavorable retention features (low H/D and high CA) prepared with (n = 14) and without axial grooves (n = 15) to evaluate the force required to dislodge a cemented full veneer crown...
September 2016: Journal of Veterinary Dentistry
https://www.readbyqxmd.com/read/28326710/-finite-elemental-analysis-of-the-influence-of-mandibular-plane-angle-on-the-stress-distribution-of-implant-tooth
#16
Xing Weibin, Zheng Shuxian, Yang Shiyi
OBJECTIVE: Finite elemental analysis of the mechanical characteristics of a first mandibular implant molar under different mandibular plane angles determines the load conditions on the implant, thereby providing guidance for clinical application. METHODS: CT data of three mandibular plane angles (low, average, high) were collected. A finite elemental combination model of a dental implant was constructed. The orthogonal experimental research was designed. Results followed data collection and analysis...
October 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28325640/computed-tomography-based-3-dimensional-finite-element-analyses-of-various-types-of-plates-placed-for-a-virtually-reduced-unilateral-condylar-fracture-of-the-mandible-of-a-patient
#17
Kazuhiro Murakami, Kazuhiko Yamamoto, Tsutomu Sugiura, Satoshi Horita, Yumiko Matsusue, Tadaaki Kirita
PURPOSE: This study was performed to evaluate stresses in various types of plates placed for a virtually reduced unilateral condylar fracture of the mandible using computed tomography-based 3-dimensional finite element (FE) models of a patient to select the optimal plate system. MATERIALS AND METHODS: A computed tomography-based FE model of the mandible of a patient with a unilateral condylar fracture was constructed. The fracture was virtually reduced and fixed with 1 straight titanium plate; 2 straight titanium plates; 2 straight poly-L-lactic acid plates; and 4-hole (box), 5-hole (strut), and 7-hole (lambda) condylar plates...
February 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28321256/biochemical-and-clinical-assessments-of-segmental-maxillary-posterior-tooth-intrusion
#18
Jintana Tasanapanont, Tanapan Wattanachai, Janya Apisariyakul, Peraphan Pothacharoen, Siriwan Ongchai, Prachya Kongtawelert, Marit Midtbø, Dhirawat Jotikasthira
Objective. To compare chondroitin sulphate (CS) levels around maxillary second premolars, first molars, and second molars between the unloaded and the loaded periods and to measure the rates of intrusion of maxillary posterior teeth during segmental posterior tooth intrusion. Materials and Methods. In this prospective clinical study, 105 teeth (from 15 patients exhibiting anterior open bite and requiring maxillary posterior tooth intrusion) were studied. Competitive ELISA was used to detect CS levels. Dental casts (during the unloaded and loaded periods) were scanned, and posterior tooth intrusion distances were measured...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28320537/a-randomized-clinical-trial-comparing-2-ibuprofen-formulations-in-patients-with-acute-odontogenic-pain
#19
Tanjit Taggar, Di Wu, Asma A Khan
INTRODUCTION: Ibuprofen sodium dihydrate, a new formulation of ibuprofen, was introduced with the claim of faster onset of analgesia. Most of the data on this new ibuprofen formulation are drawn from studies using the oral surgery model. Because this model differs significantly from the endodontic pain model, we conducted a study comparing ibuprofen sodium dihydrate with conventional ibuprofen acid in endodontic pain patients. METHODS: This randomized, double-masked study recruited subjects experiencing moderate to severe pain from a tooth diagnosed with symptomatic irreversible pulpitis and symptomatic apical periodontitis (n = 41)...
March 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28318918/comparison-of-functional-outcomes-and-patient-reported-satisfaction-between-titanium-and-absorbable-plates-and-screws-for-fixation-of-mandibular-fractures-a-one-year-prospective-study
#20
Maria Belén Leno, Stanley Yung Liu, Chien-Tzung Chen, Han-Tsung Liao
PURPOSE: The aim of this study is to compare the 1-year functional outcomes and patient-reported satisfaction in treating mandibular fractures between resorbable and titanium fixation devices. MATERIALS AND METHODS: A 1-year prospective study was conducted; 41 consecutive patients presenting with mandibular fractures were included. A resorbable system was used in 21 patients, while in 20 patients a titanium fixation device was used. Functional outcome was evaluated objectively at several time points (2, 4 and 6 weeks, 3 and 6 months, and 1 year after surgery)...
February 13, 2017: Journal of Cranio-maxillo-facial Surgery
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