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https://www.readbyqxmd.com/read/28542710/behavioral-inferences-from-the-high-levels-of-dental-chipping-in-homo-naledi
#1
Ian Towle, Joel D Irish, Isabelle De Groote
OBJECTIVES: A variety of mechanical processes can result in antemortem dental chipping. In this study, chipping data in the teeth of Homo naledi are compared with those of other pertinent dental samples to give insight into their etiology. MATERIALS AND METHODS: Permanent teeth with complete crowns evidencing occlusal wear were examined macroscopically. The location, number, and severity of fractures were recorded and compared to those found in samples of two other South African fossil hominin species and in samples of nonhuman primates (n = 3) and recent humans (n = 7)...
May 24, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28541308/the-controlled-disassembly-of-mesostructured-perovskites-as-an-avenue-to-fabricating-high-performance-nanohybrid-catalysts
#2
Yuan Wang, Hamidreza Arandiyan, Hassan A Tahini, Jason Scott, Xin Tan, Hongxing Dai, Julian D Gale, Andrew L Rohl, Sean C Smith, Rose Amal
Versatile superstructures composed of nanoparticles have recently been prepared using various disassembly methods. However, little information is known on how the structural disassembly influences the catalytic performance of the materials. Here we show how the disassembly of an ordered porous La0.6Sr0.4MnO3 perovskite array, to give hexapod mesostructured nanoparticles, exposes a new crystal facet which is more active for catalytic methane combustion. On fragmenting three-dimensionally ordered macroporous (3DOM) structures in a controlled manner, via a process that has been likened to retrosynthesis, hexapod-shaped building blocks can be harvested which possess a mesostructured architecture...
May 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28540505/retrospective-evaluation-of-serum-ctx-levels-after-denosumab-discontinuation-in-patients-with-or-without-prior-exposure-to-bisphosphonates
#3
B Uebelhart, R Rizzoli, S L Ferrari
Discontinuation of denosumab (Dmab) therapy is associated with lower serum CTX levels in osteoporotic patients previously exposed to bisphosphonates compared to those who were not. INTRODUCTION: Discontinuation of Dmab therapy is followed by a transient increase of bone turnover markers (BTMs) above pretreatment values, together with accelerated bone loss, and potentially an increased risk of multiple vertebral fractures. Since a substantial proportion of patients discontinuing Dmab have previously been exposed to bisphosphonates (BPs), we hypothesized that previous BP therapy could attenuate this increase in bone turnover because of the prolonged biological effects of BPs on bone...
May 24, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28539937/chlorhexidine-prevents-root-dentine-mineral-loss-and-fracture-caused-by-calcium-hydroxide-over-time
#4
Michael Ranniery Garcia Ribeiro, Érika Bárbara Abreu Fonseca Thomaz, Darlon Martins Lima, Tarcísio Jorge Leitão, José Bauer, Soraia De Fátima Carvalho Souza
Purpose. To evaluate the mineral ion loss of root dentine after treatment with 2% chlorhexidine solution (CHX) and to compare its yield and flexural strength (fs) after exposure to calcium hydroxide [Ca(OH)2]. Materials and Methods. Dentine bars (DB) were made from 90 roots of bovine incisors and randomized into three groups: GControl: distilled/deionized water (DDW), GNaOCl: 2.5% sodium hypochlorite + 17% EDTA, and GCHX: CHX + DDW. The release of phosphate (PO4) and calcium (Ca) ions was measured by spectrophotometry...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28534951/contribution-of-methylglyoxal-to-delayed-healing-of-bone-injury-in-diabetes
#5
Takao Aikawa, Hidenori Matsubara, Shuhei Ugaji, Junichi Shirakawa, Ryoji Nagai, Seiichi Munesue, Ai Harashima, Yasuhiko Yamamoto, Hiroyuki Tsuchiya
Patients with diabetes are vulnerable to delayed bone fracture healing or pseudoarthrosis. Chronic sustained hyperglycemia, reactive intermediate derivatives of glucose metabolism, such as methylglyoxal (MGO), and advanced glycation end‑products (AGEs) are implicated in diabetic complications. In the present study, it was examined whether MGO is able to cause disturbed bone healing in diabetes. Diabetes was induced in male mice by injection of streptozotocin (50 mg/kg) for 5 days. A bone defect (1.0‑mm diameter) was created in the left distal femur, and bone repair was assessed from an examination of computed tomography scans...
May 16, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28514129/-hand-injuries-in-rock-climbers
#6
REVIEW
Hagay Orbach, Guy Rubin, Alejandro Wolovelsky, Micha Rinott, Uriel Giwnewer, Nimrod Rozen
Rock climbing, whether practiced in nature on cliffs and boulders or indoors on walls made of resin and wood, has gained tremendous popularity in recent decades. More people are exposed to injuries associated with the unique biomechanical forces of rock climbing. A series of repetitive high torque movements of the upper limbs are needed to ascend a wall or rockface. These movements subject the hand and wrist to large forces, potentially resulting in ligament and tendon sprains or rupture and even bone fracture...
July 2016: Harefuah
https://www.readbyqxmd.com/read/28493077/lung-protective-effects-of-low-volume-resuscitation-and-pharmacologic-treatment-of-swine-subjected-to-polytrauma-and-hemorrhagic-shock
#7
Vahagn C Nikolian, Baihong Pan, Tomaz Mesar, Isabel S Dennahy, Patrick E Georgoff, Xiuzhen Duan, Baoling Liu, Xizi Wu, Michael J Duggan, Hasan B Alam, Yongqing Li
Hemorrhage is a common cause of death in the battlefield. Valproic acid (VPA) has been associated with improved outcomes in multiple models of trauma, when combined with isotonic fluid resuscitation. However, isotonic fluid administered in this setting is logistically impractical and may be associated with complications. In this study, we sought to evaluate the feasibility and immunologic impact of combining VPA treatment with low-volume hypertonic saline (HTS). In vivo: female Yorkshire swine were subjected to hemorrhage (40% total blood volume) and polytrauma (rib fracture and delayed liver injury)...
May 10, 2017: Inflammation
https://www.readbyqxmd.com/read/28489206/lower-extremity-reconstruction-epidemiology-management-and-outcomes-of-patients-of-the-federal-district-north-wing-regional-hospital
#8
Jefferson Lessa Soares Macedo, Simone Corrêa Rosa, Daniel Lobo Botelho, Clendes Pereira Dos Santos, Murilo Neves DE Queiroz, Tabatha Gonçalves Andrade Castelo Branco Gomes
Objective: to evaluate the management of lower limbs complex traumatic injuries by analyzing their characteristics, types, conduct and evolution, with emphasis on surgical treatment. Methods: we conducted a prospective study of patients treated by Plastic Surgery at a regional hospital of the Federal District during a one-year period. We collected data through serial evaluations and telephone contact records. Results: we studied 40 patients, with a mean age of 25...
January 2017: Revista do Colégio Brasileiro de Cirurgiões
https://www.readbyqxmd.com/read/28479258/triceps-sparing-extra-articular-step-cut-olecranon-osteotomy-for-distal-humeral-fractures-an-anatomic-study
#9
Matthias A Zumstein, Sumit Raniga, Remy Flueckiger, Lorenzo Campana, Beat K Moor
BACKGROUND: This anatomic study investigated the distal humeral articular surface exposure achievable through a triceps-sparing oblique extra-articular osteotomy of the olecranon with a step-cut modification compared with the anconeus flap transolecranon apex distal chevron osteotomy. In addition, the bone contact surface areas of the osteotomized surfaces after transolecranon and extra-articular osteotomies were compared. METHODS: Seven pairs of fresh adult cadaveric elbow joints were examined...
May 4, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28465844/delayed-treatment-of-traumatized-primary-teeth-with-distinct-pulp-response-follow-up-until-permanent-successors-eruption
#10
Gabriela Cristina de Oliveira, Juliana Calistro da Silva, Franciny Querobim Ionta, Catarina Ribeiro Barros de Alencar, Priscilla Santana Pinto Gonçalves, Thaís Marchini de Oliveira, Thiago Cruvinel, Daniela Rios
Complicated crown fracture and crown-root fracture with pulp involvement expose dental pulp to the oral environment. The pulp outcome is often unpredictable because the patient and injury which are related to variables can influence the treatment of choice and the prognosis of the case. This report presents the case of a 4-year-old boy with complicated crown fracture with pulp polyp in the primary right maxillary central incisor (51) and crown-root fracture with pulp involvement in the primary left maxillary central incisor (61), which was treated only 3 months after the tooth injuries...
2017: Case Reports in Dentistry
https://www.readbyqxmd.com/read/28465016/incidence-of-treatment-for-infection-of-buried-versus-exposed-kirschner-wires-in-phalangeal-metacarpal-and-distal-radial-fractures
#11
Taylor J Ridley, Will Freking, Lauren O Erickson, Christina Marie Ward
PURPOSE: To determine whether there is a difference in the incidence of infection between exposed and buried K-wires when used to treat phalangeal, metacarpal, and distal radius fractures. METHODS: We conducted a retrospective review identifying all patients aged greater than 16 years who underwent fixation of phalangeal, metacarpal, or distal radius fractures with K-wires between 2007 and 2015. We recorded patient demographic data, fracture location, number of K-wires used, whether K-wires were buried or left exposed, and duration of K-wire placement...
April 29, 2017: Journal of Hand Surgery
https://www.readbyqxmd.com/read/28463496/interfacial-phenomena-and-mechanical-behavior-of-polyetheretherketone-polybenzimidazole-blend-under-hygrothermal-environment
#12
Peng Liu, Michael Mullins, Tim Bremner, Natalie Benner, Hung-Jue Sue
Demands for engineering applications of high performance polymers, such as the polyaryletherketone families, have grown significantly in recent years. Fundamental knowledge on the mechanical behavior of such polymers, especially under harsh environments, is still lacking. In this study, the mechanical behavior and interfacial phenomena of a blend of polybenzimidazole (PBI) particles having sizes of about 50 μm and polyetheretherketone (PEEK) matrix at 50:50 weight ratio was characterized. PBI and PEEK are known to be incompatible with each other in the dry state...
May 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28436733/social-and-hospital-costs-of-patients-admitted-to-a-university-hospital-in-brazil-due-to-motorcycle-crashes
#13
Katia Campos Dos Anjos, Marcelo Rosa de Rezende, Rames Mattar
OBJECTIVE: This study aimed to investigate the social and hospital costs of patients treated at a public hospital who were motorcycle crash victims. METHOD: This prospective study was on 68 motorcycle riders (drivers or passengers), who were followed up from hospital admission to 6 months after the crash. A questionnaire covering quantitative and qualitative questions was administered. RESULTS: Motorcycle crash victims were responsible for 12% of the institution's hospital admissions; 54...
February 13, 2017: Traffic Injury Prevention
https://www.readbyqxmd.com/read/28432999/effect-of-intra-oral-aging-on-t%C3%A2-m-phase-transformation-microstructure-and-mechanical-properties-of-y-tzp-dental-ceramics
#14
Luciana Meireles Miragaya, Renato Bastos Guimarães, Rodrigo Othávio de Assunção E Souza, Glauco Dos Santos Botelho, José Guilherme Antunes Guimarães, Eduardo Moreira da Silva
The aim of the present study was to evaluate the influence of intra-oral aging on the tetragonal-to-monoclinic (t→m) phase transformation of two Y-TZP dental ceramics - Lava Frame (Frame) and Lava Plus (Plus) - and determine the impact of this response on their microstructures and mechanical properties: flexural strength, Young's modulus, microhardness and fracture toughness. Standardized ceramic specimens were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM)...
April 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28425455/the-effect-of-hydraulic-flowback-and-produced-water-on-gill-morphology-oxidative-stress-and-antioxidant-response-in-rainbow-trout-oncorhynchus-mykiss
#15
Tamzin A Blewett, Alyssa M Weinrauch, Perrine L M Delompré, Greg G Goss
Hydraulic fracturing fluid are complex mixtures containing high concentrations of salts (up to 330,000 ppm), organic, and metal contaminants. However, little data exist on the potential mechanisms of toxicity of these flowback and produced wastewaters (FPW) on aquatic biota. Juvenile rainbow trout were exposed to either control, FPW (2.5 or 7.5%), FPW that had been treated with activated charcoal (AC), or a custom salt-matched control (SW; replicating only the salt content of FPW) for 48 hours. Gill histology revealed decreases in interlamellar cell mass (ILCM) and mean lamellar length in all treatments (FPW, AC and SW) compared to control, indicative of hyperosmotic stress...
April 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28414985/sharp-and-blunt-force-trauma-concealment-by-thermal-alteration-in-homicides-an-in-vitro-experiment-for-methodology-and-protocol-development-in-forensic-anthropological-analysis-of-burnt-bones
#16
Ioana Macoveciuc, Nicholas Márquez-Grant, Ian Horsfall, Peter Zioupos
Burning of human remains is one method used by perpetrators to conceal fatal trauma and expert opinions regarding the degree of skeletal evidence concealment are often disparate. This experiment aimed to reduce this incongruence in forensic anthropological interpretation of burned human remains and implicitly contribute to the development of research methodologies sufficiently robust to withstand forensic scrutiny in the courtroom. We have tested the influence of thermal alteration on pre-existing sharp and blunt trauma on twenty juvenile sheep radii in the laboratory using an automated impact testing system and an electric furnace...
March 29, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28409216/oral-contraceptive-use-and-fracture-risk-a-retrospective-study-of-12-970-women-in-the-uk
#17
S Dombrowski, L Jacob, P Hadji, K Kostev
In the present retrospective case-control study, we compared 6485 women with fractures and 6485 women without fractures from 135 general practitioner offices in the UK. Women without bone fractures were statistically more likely to have been exposed to oral contraception, depending on their age and therapy duration. INTRODUCTION: The aim of this analysis was to compare the risk of bone fracture in women using hormonal contraception with that in women who have never used hormonal contraception...
April 13, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28403495/-diagnosis-and-therapeutic-management-in-kidney-ureter-and-bladder-trauma
#18
Karin Hirsch, Marco Heinz, Bernd Wullich
Trauma refers to the destruction of tissues or organs by external forces and it is the most common cause of mortality and morbidity in children (1, 2). Injuries of the genitourinary tract may be the result of blunt (falls, sport injuries, motor vehicle accidents and sexual abuse) or penetrating (stab wounds, gun shots, falling onto sharp objects) injuries. The genitourinary tract is significantly injured in 2.9% of paediatric trauma patients 4.In the paediatric population, the kidney is the most affected organ in the genitourinary tract (>60% of all genitourinary tract injuries) 4...
February 2017: Aktuelle Urologie
https://www.readbyqxmd.com/read/28401681/effect-of-dentin-pretreatment-with-potassium-oxalate-a-6-year-follow-up
#19
Isabel Cristina Celerino de Moraes Porto, Joatan Lucas de Sousa Gomes Costa, Marcio Rafael Nascimento da Silva Lopes, Johnnatan Duarte de Freitas, Isabelle Lins Macêdo de Oliveira, Gabriela Queiroz de Melo Monteiro, Marcos Antônio Japiassú Resende Montes
Oxalate-based products are effective against dentine sensitivity and have been studied as an option to improve long-term adhesive bonding strength. Our aim was to evaluate the effect of potassium oxalate on the microtensile bond strength (µTBS) of the dentin/resin interface after 24 h, 1, and 6 years. Dentin on the occlusal surface of 16 human premolars was exposed and etched with 35% phosphoric acid. The teeth were divided into four groups. Two groups received 3% monohydrated potassium oxalate and the following adhesive systems and composites: Adper Scotchbond Multipurpose + FiltekZ350 (3M/ESPE) and Prime & Bond NT + Esthet-X (Dentsply)...
April 12, 2017: Microscopy Research and Technique
https://www.readbyqxmd.com/read/28393739/prenatal-exposure-to-vitamin-d-from-fortified-margarine-and-risk-of-fractures-in-late-childhood-period-and-cohort-results-from-222-000-subjects-in-the-d-tect-observational-study
#20
Mina Nicole Händel, Peder Frederiksen, Clive Osmond, Cyrus Cooper, Bo Abrahamsen, Berit L Heitmann
Prenatal low vitamin D may have consequences for bone health. By means of a nationwide mandatory vitamin D fortification programme, we examined the risk of fractures among 10-18-year-old children from proximate birth cohorts born around the date of the termination of the programme. For all subjects born in Denmark during 1983-1988, civil registration numbers were linked to the Danish National Patient Registry for incident and recurrent fractures occurring at ages 10-18 years. Multiplicative Poisson models were used to examine the association between birth cohort and fracture rates...
March 2017: British Journal of Nutrition
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