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https://www.readbyqxmd.com/read/28626763/implant-stability-in-the-posterior-maxilla-a-controlled-clinical-trial
#1
Raquel Zita Gomes, Mario Ramalho de Vasconcelos, Isabel Maria Lopes Guerra, Rute Alexandra Borges de Almeida, Antonio Cabral de Campos Felino
AIM: To evaluate the primary and secondary stability of implants in the posterior maxilla. METHODS: Patients were allocated into three groups: (A) native bone, (B) partially regenerated bone, and (C) nearly totally regenerated bone. Insertion torque (IT) and implant stability quotient (ISQ) were measured at placement, to evaluate whether satisfactory high primary stability (IT ≥ 45 N/cm; ISQ ≥ 60) was achieved; ISQ was measured 15, 30, 45, and 60 days after placement, to investigate the evolution to secondary stability...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28576112/periodic-nonlinear-sliding-modes-for-two-uniformly-magnetized-spheres
#2
Boyd F Edwards, John M Edwards
A uniformly magnetized sphere slides without friction along the surface of a second, identical sphere that is held fixed in space, subject to the magnetic force and torque of the fixed sphere and the normal force. The free sphere has two stable equilibrium positions and two unstable equilibrium positions. Two small-amplitude oscillatory modes describe the sliding motion of the free sphere near each stable equilibrium, and an unstable oscillatory mode describes the motion near each unstable equilibrium. The three oscillatory modes remain periodic at finite amplitudes, one bifurcating into mixed modes and circumnavigating the free sphere at large energies...
May 2017: Chaos
https://www.readbyqxmd.com/read/28571442/design-and-analysis-of-an-mr-rotary-brake-for-self-regulating-braking-torques
#3
Dongwon Yun, Jeong-Hoi Koo
This paper presents a novel Magneto-rheological (MR) brake system that can self-regulate the output braking torques. The proposed MR brake can generate a braking torque at a critical rotation speed without an external power source, sensors, or controllers, making it a simple and cost-effective device. The brake system consists of a rotary disk, permanent magnets, springs, and MR fluid. The permanent magnets are attached to the rotary disk via the springs, and they move outward through grooves with two different gap distances along the radial direction of the stator due to the centrifugal force...
May 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28526174/twist-buckling-of-veins-under-torsional-loading
#4
Justin R Garcia, Arnav Sanyal, Fatemeh Fatemifar, Mohammad Mottahedi, Hai-Chao Han
Veins are often subjected to torsion and twisted veins can hinder and disrupt normal blood flow but their mechanical behavior under torsion is poorly understood. The objective of this study was to investigate the twist deformation and buckling behavior of veins under torsion. Twist buckling tests were performed on porcine internal jugular veins (IJVs) and human great saphenous veins (GSVs) at various axial stretch ratio and lumen pressure conditions to determine their critical buckling torques and critical buckling twist angles...
May 5, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28523072/delayed-endothelial-progenitor-cell-therapy-promotes-bone-defect-repair-in-a-clinically-relevant-rat-model
#5
Brent D Bates, Charles Godbout, David J Ramnaraign, Emil H Schemitsch, Aaron Nauth
The repair of segmental bone defects remains a significant challenge for orthopaedic surgeons. Endothelial progenitor cells (EPCs) have successfully promoted the repair of acute defects in animal models; however, the ability of EPCs to induce the repair of chronic nonhealing defects, such as those often encountered clinically, has not been investigated. Therefore, the purpose of this study was to investigate the ability of EPCs delivered in delayed fashion to induce the repair of nonhealing defects in a clinically relevant model...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28512551/consensus-statements-and-clinical-recommendations-on-treatment-indications-surgical-procedures-prosthetic-protocols-and-complications-following-all-on-4-standard-treatment-9th-mozo-grau-ticare-conference-in-quintanilla-spain
#6
REVIEW
Miguel Penarrocha-Diago, María Penarrocha-Diago, Regino Zaragozí-Alonso, David Soto-Penaloza, Meeting On Behalf Of The Ticare Consensus
OBJECTIVES: The present consensus report critically evaluates the scientific evidence based on a comprehensive systematic review of the All-On-4 treatment concept, focusing primarily on the treatment indications, surgical procedures and prosthetic protocols, and secondarily on the mechanical and biological complications involved. MATERIAL AND METHODS: A systematic review was made in advance of the meeting. Consensus statements, treatment guidelines and recommendations for future research were based on within-group as well as plenary debates and discussions of the systematic review...
May 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28474606/asymmetries-in-wing-inertial-and-aerodynamic-torques-contribute-to-steering-in-flying-insects
#7
Mark Jankauski, T L Daniel, I Y Shen
Maneuvering in both natural and artificial miniature flying systems is assumed to be dominated by aerodynamic phenomena. To explore this, we develop a flapping wing model integrating aero and inertial dynamics. The model is applied to an elliptical wing similar to the forewing of the Hawkmoth Manduca sexta and realistic kinematics are prescribed. We scrutinize the stroke deviation phase, as it relates to firing latency in airborne insect steering muscles which has been correlated to various aerial maneuvers...
June 8, 2017: Bioinspiration & Biomimetics
https://www.readbyqxmd.com/read/28471016/a-novel-lesion-crossing-technique-balloon-deployment-using-forcible-manner-badform-technique
#8
Keisuke Nakabayashi, Hiroshi Ando, Nobuhito Kaneko, Manabu Shiozaki, Daisuke Sunaga, Akihiro Matsui, Kazuhiko Tanaka, Minoru Shimizu
OBJECTIVES: We evaluated the efficacy and safety of a novel endovascular technique for crossing arterial lesions: The BAlloon Deployment using FORcible Manner (BADFORM) technique. BACKGROUND: Endovascular treatment (EVT) for peripheral artery disease has been widely adopted, and developments in device technology and techniques have resulted in acceptable success rates. However, it may be difficult to deliver devices even after wire externalization, especially in the presence of an extremely long chronic total occlusion or severely calcified lesion...
May 4, 2017: Catheterization and Cardiovascular Interventions
https://www.readbyqxmd.com/read/28450171/optimization-of-critical-quality-attributes-in-continuous-twin-screw-wet-granulation-via-design-space-validated-with-pilot-scale-experimental-data
#9
Huolong Liu, S C Galbraith, Brendon Ricart, Courtney Stanton, Brandye Smith-Goettler, Luke Verdi, Thomas O'Connor, Sau Lee, Seongkyu Yoon
In this study, the influence of key process variables (screw speed, throughput and liquid to solid (L/S) ratio) of a continuous twin screw wet granulation (TSWG) was investigated using a central composite face-centered (CCF) experimental design method. Regression models were developed to predict the process responses (motor torque, granule residence time), granule properties (size distribution, volume average diameter, yield, relative width, flowability) and tablet properties (tensile strength). The effects of the three key process variables were analyzed via contour and interaction plots...
June 15, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28446768/linear-dynamics-of-classical-spin-as-m%C3%A3-bius-transformation
#10
Alexey Galda, Valerii М Vinokur
Though the overwhelming majority of natural processes occur far from the equilibrium, general theoretical approaches to non-equilibrium phase transitions remain scarce. Recent breakthroughs introduced a description of open dissipative systems in terms of non-Hermitian quantum mechanics enabling the identification of a class of non-equilibrium phase transitions associated with the loss of combined parity (reflection) and time-reversal symmetries. Here we report that the time evolution of a single classical spin (e...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28378095/measurement-of-muscle-health-in-aging
#11
Peter Francis, Mark Lyons, Mathew Piasecki, Jamie Mc Phee, Karen Hind, Philip Jakeman
Muscle health is a critical component in the struggle against physical frailty and the efforts to maintain metabolic health until the limit of chronological age. Consensus opinion is to evaluate muscle health in terms of muscle mass, strength and functional capability. There has been considerable variability in the components of muscle health which have been investigated in addition to variability in the tools of assessment and protocol for measurement. This is in stark contrast to the validated measurement of bone health across the adult life span...
April 4, 2017: Biogerontology
https://www.readbyqxmd.com/read/28269625/development-and-validation-of-thums-version-5-with-1d-muscle-models-for-active-and-passive-automotive-safety-research
#12
Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto
Accurately predicting the occupant kinematics is critical to better understand the injury mechanisms during an automotive crash event. The objectives of this study were to develop and validate a finite element (FE) model of the human body integrated with an active muscle model called Total HUman Model for Safety (THUMS) version 5, which has the body size of the 50th percentile American adult male (AM50). This model is characterized by being able to generate a force owing to muscle tone and to predict the occupant response during an automotive crash event...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269023/a-wheelchair-with-lever-propulsion-control-for-climbing-up-and-down-stairs
#13
Kai Sasaki, Yosuke Eguchi, Kenji Suzuki
This study proposes a novel stair-climbing wheelchair based on lever propulsion control using the human upper body. Wheelchairs are widely used as supporting locomotion devices for people with acquired lower limb disabilities. However, steps and stairs are critical obstacles to locomotion, which restrict their activities when using wheelchairs. Previous research focused on power-assisted, stair-climbing wheelchairs, which were large and heavy due to its large actuators and mechanisms. In the previous research, we proposed a wheelchair with lever propulsion mechanism and presented its feasibility of climbing up the stairs...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28259465/contribution-of-muscle-short-range-stiffness-to-initial-changes-in-joint-kinetics-and-kinematics-during-perturbations-to-standing-balance-a-simulation-study
#14
Friedl De Groote, Jessica L Allen, Lena H Ting
Simulating realistic musculoskeletal dynamics is critical to understanding neural control of muscle activity evoked in sensorimotor feedback responses that have inherent neural transmission delays. Thus, the initial mechanical response of muscles to perturbations in the absence of any change in muscle activity determines which corrective neural responses are required to stabilize body posture. Muscle short-range stiffness, a history-dependent property of muscle that causes a rapid and transient rise in muscle force upon stretch, likely affects musculoskeletal dynamics in the initial mechanical response to perturbations...
April 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28227883/development-and-validation-of-thums-version-5-with-1d-muscle-models-for-active-and-passive-automotive-safety-research
#15
Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Yuko Nakahira, Masami Iwamoto, Hideyuki Kimpara, Masami Iwamoto, Yuko Nakahira
Accurately predicting the occupant kinematics is critical to better understand the injury mechanisms during an automotive crash event. The objectives of this study were to develop and validate a finite element (FE) model of the human body integrated with an active muscle model called Total HUman Model for Safety (THUMS) version 5, which has the body size of the 50th percentile American adult male (AM50). This model is characterized by being able to generate a force owing to muscle tone and to predict the occupant response during an automotive crash event...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227236/a-wheelchair-with-lever-propulsion-control-for-climbing-up-and-down-stairs
#16
Kai Sasaki, Yosuke Eguchi, Kenji Suzuki, Kai Sasaki, Yosuke Eguchi, Kenji Suzuki, Kenji Suzuki, Yosuke Eguchi, Kai Sasaki
This study proposes a novel stair-climbing wheelchair based on lever propulsion control using the human upper body. Wheelchairs are widely used as supporting locomotion devices for people with acquired lower limb disabilities. However, steps and stairs are critical obstacles to locomotion, which restrict their activities when using wheelchairs. Previous research focused on power-assisted, stair-climbing wheelchairs, which were large and heavy due to its large actuators and mechanisms. In the previous research, we proposed a wheelchair with lever propulsion mechanism and presented its feasibility of climbing up the stairs...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28198805/boundary-dependent-mechanical-properties-of-graphene-annular-under-in-plane-circular-shearing-via-atomistic-simulations
#17
Yinfeng Li, Qianling Lin, Daxiang Cui
Graphene annulus possesses special wrinkling phenomenon with wide range of potential applications. Using molecular dynamics simulation, this study concerns the effect of boundary on the mechanical properties of circular and elliptical graphene annuli under circular shearing at inner edge. Both the wrinkle characteristic and torque capacity of annular graphene can be effectively tuned by outer boundary radius and aspect ratio. For circular annulus with fixed inner radius, the critical angle of rotation can be increased by several times without sacrificing its torque capacity by increasing outer boundary radius...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28168959/the-bending-stiffness-of-shoes-is-beneficial-to-running-energetics-if-it-does-not-disturb-the-natural-mtp-joint-flexion
#18
Keonyoung Oh, Sukyung Park
A local minimum for running energetics has been reported for a specific bending stiffness, implying that shoe stiffness assists in running propulsion. However, the determinant of the metabolic optimum remains unknown. Highly stiff shoes significantly increase the moment arm of the ground reaction force (GRF) and reduce the leverage effect of joint torque at ground push-off. Inspired by previous findings, we hypothesized that the restriction of the natural metatarsophalangeal (MTP) flexion caused by stiffened shoes and the corresponding joint torque changes may reduce the benefit of shoe bending stiffness to running energetics...
February 28, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28104406/a-novel-methodology-to-study-polymodal-particle-size-distributions-produced-during-continuous-wet-granulation
#19
Carlota Mendez Torrecillas, Gavin W Halbert, Dimitrios A Lamprou
It is important during powder granulation to obtain particles of a homogeneous size especially in critical situations such as pharmaceutical manufacture. To date, homogeneity of particle size distribution has been defined by the use of the d50 combined with the span of the particle size distribution, which has been found ineffective for polymodal particle size distributions. This work focuses on demonstrating the limitations of the span parameter to quantify homogeneity and proposes a novel improved metric based on the transformation of a typical particle size distribution curve into a homogeneity factor which can vary from 0 to 100%...
March 15, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28070611/dual-mobility-cups-provide-biomechanical-advantages-in-situations-at-risk-for-dislocation-a-finite-element-analysis
#20
Alexandre Terrier, Adeliya Latypova, Maika Guillemin, Valérie Parvex, Olivier Guyen
PURPOSE: Constrained devices, standard implants with large heads, and dual mobility systems have become popular options to manage instability after total hip arthroplasty (THA). Clinical results with these options have shown variable success rates and significant higher rates of aseptic loosening and mechanical failures with constrained implants. Literature suggests potential advantages of dual mobility, however little is known about its biomechanics. We present a comparative biomechanical study of a standard implant, a constrained implant, and a dual mobility system...
January 9, 2017: International Orthopaedics
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