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https://www.readbyqxmd.com/read/28075495/oral-tactile-sensitivity-and-masticatory-performance-are-impaired-in-stroke-patients
#1
Martin Schimmel, Garance Voegeli, Elena Duvernay, Beatrice Leemann, Frauke Müller
BACKGROUND: Orofacial impairment following stroke frequently involves reduced chewing performance, i.e., oral phase dysphagia. OBJECTIVE: To investigate the sensitivity of oral tissues following stroke and its potential impact on masticatory function. METHODS: Hospitalized post-stroke patients were recruited and compared to healthy controls. Outcome measures comprised masticatory performance employing a colour-mixing ability-, i.e. bolus-kneading test, maximum lip and bite force, and the one-point and two-point tactile thresholds...
January 11, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28071906/single-conformation-spectroscopy-of-suberoylanilide-hydroxamic-acid-saha-a-molecule-bites-its-tail
#2
Di Zhang, Karl N Blodgett, Xiao Zhu, Timothy S Zwier
Suberoylanilide hydroxamic acid (C6H5NHCO(CH2)6CONHOH, SAHA) is a histone deacetylase inhibitor that causes growth arrest and differentiation of many tumor types and is an approved drug for the treatment of cancer. With a hydrogen-bonding amide group adjacent to its phenyl ring "head", and a hydroxamic acid group at the "tail" end of a C6 alkyl chain linker, SAHA possesses an interesting potential energy landscape to be probed by single-conformation methods. The alkyl chain's preference for extended structures is in competition with tail-to-head (T-H) or head-to-tail (H-T) hydrogen bonds between the amide and hydroxamic acid groups...
January 10, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28045812/miniplate-with-a-bendable-c-tube-head-allows-the-clinician-to-alter-biomechanical-advantage-in-extremely-complicated-anatomic-structure
#3
Kyung Won Seo, Nur Serife Iskenderoglu, Eui Hwan Hwang, Kyu-Rhim Chung, Seong-Hun Kim
BACKGROUNDS: This article reports C-tube miniplates as a practical temporary anchorage device choice to treat open bite patients with maxillary sinus pneumatization. METHODS: The C-tube components are titanium anchor plates and monocortical screws that are basically similar to any other miniplate systems, but it has the unique characteristic of the tube head to be malleable. The manipulation of the head part is easy due to the composition of pure titanium. The I-shaped C-tube with 3 holes and T-shaped C-tube miniplates were placed above the apices of maxillary molars as an absolute anchorage system to intrude the posterior maxilla...
December 30, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28042256/are-temporary-anchorage-devices-truly-effective-in-the-treatment-of-skeletal-open-bites
#4
Hakan Turkkahraman, Mehmet Sarioglu
OBJECTIVE: The aims of this study were to evaluate the effects of temporary anchorage devices (TADs) in the treatment of skeletal open bites and to compare the results with untreated controls. MATERIALS AND METHODS: A total of forty patients with skeletal anterior open bites were assigned to two groups of twenty each. The mean chronological age for the treatment group (14 female, 6 male) was 16.68 ± 2.80 years old, compared with 16.63 ± 2.83 years old for the control group (11 female, 9 male)...
October 2016: European Journal of Dentistry
https://www.readbyqxmd.com/read/28000406/zygomatic-root-position-in-recent-and-fossil-hominids
#5
Gerhard W Weber, Viktoria A Krenn
The relative position of the zygomatic root to the dentition plays a crucial role in determining the overall strength of the face in response to bite forces. The powerful superficial head of the masseter arises there and the zygomaticoalveolar crest (ZAC) is discussed as a buttressing feature of the face. For instance, a more forwardly or backwardly positioned zygomatic root or a lower or higher vertical distance to the dentition could be indicative for evolutionary adaptations to particular loading regimes which are associated with diet...
January 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28000401/opposing-extremes-of-zygomatic-bone-morphology-australopithecus-boisei-versus-homo-neanderthalensis
#6
Yoel Rak, Assaf Marom
The lateral margin of the zygomatic bone of Australopithecus boisei flares both anteriorly and laterally. As a result, the bone loses the suspensory bracing of the facial frame and is transformed into a visor-like structure that supports itself and gains its rigidity from its shape. The coronally oriented bony plates and the outline of the facial mask help the A. boisei face resist the effect of the visor-like structure, which tends to pull the bone plates of the face away from the midline. On the other hand, the nearly sagittal orientation of the zygomatic bone in Homo neanderthalensis helps the face resist torque and bending forces, which themselves stem from the positioning of the bite point on the anterior teeth...
January 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28000400/biomechanical-evaluation-of-different-musculoskeletal-arrangements-in-psittacosaurus-and-implications-for-cranial-function
#7
Adam C Taylor, Stephan Lautenschlager, Zhao Qi, Emily J Rayfield
The masseter muscle complex is a unique feature of extant mammals and their advanced cynodont precursors, originating from the zygomatic arch and inserting onto the lateral surface of the dentary. This muscle complex is absent in sauropsids, with the exception of the neomorphic m. pseudomasseter complex that is unique to psittaciform birds (parrots and cockatiels). The anterior position and anterodorsally inclined line of action of both muscle groups increases leverage of the jaw and is thought to contribute to increased bite force, particularly in psittaciforms...
January 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28000396/the-biomechanics-of-bony-facial-buttresses-in-south-african-australopiths-an-experimental-study-using-finite-element-analysis
#8
Justin A Ledogar, Stefano Benazzi, Amanda L Smith, Gerhard W Weber, Keely B Carlson, Paul C Dechow, Ian R Grosse, Callum F Ross, Brian G Richmond, Barth W Wright, Qian Wang, Craig Byron, Kristian J Carlson, Darryl J De Ruiter, Leslie C Pryor Mcintosh, David S Strait
Australopiths exhibit a number of derived facial features that are thought to strengthen the face against high and/or repetitive loads associated with a diet that included mechanically challenging foods. Here, we use finite element analysis (FEA) to test hypotheses related to the purported strengthening role of the zygomatic root and "anterior pillar" in australopiths. We modified our previously constructed models of Sts 5 (Australopithecus africanus) and MH1 (A. sediba) to differ in the morphology of the zygomatic root, including changes to both the shape and positioning of the zygomatic root complex, in addition to creating variants of Sts 5 lacking anterior pillars...
January 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/27998007/mandibular-movements-and-bite-force-in-alzheimer-disease-before-and-after-new-denture-insertion
#9
Camila Heitor Campos, Giselle Rodrigues Ribeiro, Florindo Stella, Renata Cunha Matheus Rodrigues Garcia
BACKGROUND: Chewing impairment has been observed in elders with Alzheimer disease (AD), however it is unknown whether oral rehabilitation can improve their masticatory function. OBJECTIVE: This study evaluated the influence of new removable prostheses on chewing function of patients with AD METHODS: Participants using removable dentures were divided into two groups: patients with mild AD (77.2 ± 5.8 years, n=16) and controls (76.0 ± 4.4, n=16). All participants received general dental treatment and new total and/or partial removable prostheses...
December 20, 2016: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/27990277/biting-the-hand-that-feeds-current-opinion-on-the-interpersonal-causes-correlates-and-consequences-of-borderline-personality-disorder
#10
REVIEW
Sheila E Crowell
Borderline personality disorder (BPD) is a complex psychiatric diagnosis characterized by dysregulated behaviors, emotions, cognitions, and interpersonal relationships. In recent years, developmental psychopathologists have sought to identify early origins of BPD, with the ultimate goal of developing and providing effective preventative interventions for those at highest risk. In addition to heritable biological sensitivities, many scholars assert that environmental and interpersonal risk factors contribute to the emergence and maintenance of key borderline traits...
2016: F1000Research
https://www.readbyqxmd.com/read/27982245/craniofacial-morphology-affects-bite-force-in-patients-with-painful-temporomandibular-disorders
#11
Paula Furlan Bavia, Larissa Soares Reis Vilanova, Renata Cunha Matheus Rodrigues Garcia
Craniofacial morphology affects masticatory performance in healthy dentate subjects, but little is known about its effects in patients with painful temporomandibular disorders (TMDs). Forty-eight female patients (mean age of 28±5.8 years) with painful TMDs underwent lateral cephalometric radiography. Using Ricketts' cephalometric analysis and the Vert method, subjects were assigned to three groups according to their craniofacial morphology: brachyfacial (n=22), mesofacial (n=13), and dolichofacial (n=13). Research diagnostic criteria for TMD were used to confirm the TMD diagnosis for each patient...
September 2016: Brazilian Dental Journal
https://www.readbyqxmd.com/read/27980336/in-patients-with-shortened-dental-arches-do-removable-dental-prostheses-improve-masticatory-performance
#12
Ciaran Moore, Gerry McKenna
Data sourcesPubMed, Medline, Cochrane Library, Embase and Science Direct.Study selectionStudies published in English providing data on patients with shortened dental arch (SDA) and extreme SDA (ESDA) and masticatory performance with removable dental prostheses (RDP) were included.Data extraction and synthesisTwo reviewers independently selected studies and abstracted data, with disagreements being resolved by discussion.ResultsEight studies were included; four reported on comminution studies, three on mixing ability and one included both...
December 2016: Evidence-based Dentistry
https://www.readbyqxmd.com/read/27978915/-features-of-facioscapulohumeral-muscular-dystrophy-in-oral-and-maxillofacial-region-and-mri-analysis-of-facial-muscles
#13
Y H Liu, Y X Ma, J Hu, G D Gao, Y K Wu, Z Y Zhang
Objective: To investigate the manifestation of facioscapulohumeral muscular dystrophy (FSHD) in oral and maxillofacial region. Methods: A total of 12 patients diagnosed as FSHD and 20 healthy volunteers were included in the study. Their medical history was collected from these patients. The decayed missing filled teeth (DMFT), calculus index-simplified (CI-S), occlusal relationship, maximal opening of mouth and maximum bite force were recorded. The impressions were taken to measure the maximal hight of palate and the width of palate...
December 9, 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/27929063/a-large-carnivorous-mammal-from-the-late-cretaceous-and-the-north-american-origin-of-marsupials
#14
Gregory P Wilson, Eric G Ekdale, John W Hoganson, Jonathan J Calede, Abby Vander Linden
Marsupial mammal relatives (stem metatherians) from the Mesozoic Era (252-66 million years ago) are mostly known from isolated teeth and fragmentary jaws. Here we report on the first near-complete skull remains of a North American Late Cretaceous metatherian, the stagodontid Didelphodon vorax. Our phylogenetic analysis indicates that marsupials or their closest relatives evolved in North America, as part of a Late Cretaceous diversification of metatherians, and later dispersed to South America. In addition to being the largest known Mesozoic therian mammal (node-based clade of eutherians and metatherians), Didelphodon vorax has a high estimated bite force and other craniomandibular and dental features that suggest it is the earliest known therian to invade a durophagous predator-scavenger niche...
December 8, 2016: Nature Communications
https://www.readbyqxmd.com/read/27911900/clinical-and-pharmacological-investigation-of-myotoxicity-in-sri-lankan-russell-s-viper-daboia-russelii-envenoming
#15
Anjana Silva, Christopher Johnston, Sanjaya Kuruppu, Daniela Kneisz, Kalana Maduwage, Oded Kleifeld, A Ian Smith, Sisira Siribaddana, Nicholas A Buckley, Wayne C Hodgson, Geoffrey K Isbister
BACKGROUND: Sri Lankan Russell's viper (Daboia russelii) envenoming is reported to cause myotoxicity and neurotoxicity, which are different to the effects of envenoming by most other populations of Russell's vipers. This study aimed to investigate evidence of myotoxicity in Russell's viper envenoming, response to antivenom and the toxins responsible for myotoxicity. METHODOLOGY AND FINDINGS: Clinical features of myotoxicity were assessed in authenticated Russell's viper bite patients admitted to a Sri Lankan teaching hospital...
December 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27893561/finite-element-evaluation-of-different-osteosynthesis-variations-that-used-after-segmental-mandibular-resection
#16
Koray Onur Şanal, Bora Özden, Burcu Baş
PURPOSE: The purpose of this study was to evaluate the effect of different reconstruction plates and screw combinations on stress distribution of segmental resected mandibles using finite element analysis. METHODS: Lateral (L) and lateral-central (LC) defects were simulated by a computer aided design modeling. The straight (s) and angular (a) titanium locking reconstruction plates of 2.5 mm (12 holes for L defects and 16 holes for LC defects) were modeled. Each screw was 2...
November 23, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27891455/unmasking-the-effect-of-analgesics-on-endodontic-diagnosis-using-a-novel-bite-force-sensor-device-a-prospective-randomized-clinical-trial
#17
Sushil Kishnani, Suparna Ganguly Saha, Anuj Bhardwaj, Sandeep Dubey, Mainak Saha, Shubham Kala, Sohini Jain, Shweta Narwani
INTRODUCTION: A definitive diagnosis is of primary importance before initiating any endodontic treatment; yet, there are occasions when the dental professional is unable to accurately reproduce the patient's chief complaint, as it can pose a dilemma and may require consideration of multiple variables in order to reach an accurate diagnosis. So to overcome this problem, a methodical approach in providing endodontic treatment should be implemented which includes diagnosis, definitive dental treatment and adjunctive drug therapy, known as the "3D" strategy...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27880779/a-mighty-claw-pinching-force-of-the-coconut-crab-the-largest-terrestrial-crustacean
#18
Shin-Ichiro Oka, Taketeru Tomita, Kei Miyamoto
Crustaceans can exert a greater force using their claws than many animals can with other appendages. Furthermore, in decapods, the chela is a notable organ with multifunctional roles. The coconut crab, Birgus latro, is the largest terrestrial crustacean and has a remarkable ability to lift weights up to approximately 30 kg. However, the pinching force of this crab's chelae has not been previously investigated. In the present study, we measured the pinching force of the chelae in 29 wild coconut crabs (33-2,120 g in body weight)...
2016: PloS One
https://www.readbyqxmd.com/read/27869350/skeletogenesis-of-myiopsitta-monachus-psittaciformes-and-sequence-heterochronies-in-aves
#19
Julieta Carril, Claudia P Tambussi
The ossification sequence of Myiopsitta monachus was determined. Myiopsitta has a similar sequence to other altricial birds, with delayed skeletons compared to precocial species. The hindlimbs ossify before the forelimbs, a condition that could be linked to altriciality. To determine the stability of the sequences of ossification across birds, we selected species of different groups of Aves and used event-pairing method and character mapping on a phylogeny. Our results show that the homogeneity in the development of birds was supported by 56...
November 21, 2016: Evolution & Development
https://www.readbyqxmd.com/read/27866879/differences-in-bite-force-between-dolichofacial-and-brachyfacial-individuals-side-of-mastication-gender-weight-and-height
#20
Paulo Roberto Quiudini, Daniel Humberto Pozza, Ary Dos Santos Pinto, Mauricio Ferraz de Arruda, Antonio Sergio Guimarães
PURPOSE: Due to the bite force importance in functionality of the masticatory system, this study aimed to characterize it in dolichofacial and brachyfacial individuals. METHODS: A sample comprised by 190 patients was divided into two groups: 90 severe dolichofacial, and 100 severe brachyfacial individuals classified according to the VERT index and the face height ratio (Jarabak quotient). Bite force was measured by using an adjusted digital dynamometer and proper methodology...
November 17, 2016: Journal of Prosthodontic Research
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