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https://www.readbyqxmd.com/read/29160804/residual-endodontic-filling-material-after-post-space-preparation-a-confocal-microscopic-study
#1
Yu-Yao Teoh, Laurence J Walsh
This laboratory study assessed removability of endodontic alkaline cements and resin sealers using coronal cross-sectional slices of roots with single canals. Materials were labelled with 0.1% (w/w) sodium fluorescein prior to mixing so that confocal microscopy could be used to quantify material remaining on the walls of post spaces, to assess cleanliness. Roots of extracted teeth were prepared using rotary NiTi instruments then obturated using lateral condensation with gutta percha and epoxy resin sealers (AH-Plus™ or Zirmix™), or were filled by injecting mineral trioxide aggregate (MTA) cement (GC Nex™ MTA or MTAmix™) or a hard-setting calcium hydroxide cement (Supercal™)...
November 21, 2017: Materials
https://www.readbyqxmd.com/read/29159731/effects-of-population-variability-on-knee-loading-during-simulated-human-gait
#2
Rebecca J Nesbitt, Nathaniel A Bates, Marepalli B Rao, Grant Schaffner, Jason T Shearn
Cadaveric simulation models allow researchers to study native tissues in situ. However, as tests are conducted using donor specimens with unmatched kinematics, techniques that impose population average motions are subject to deviation from true physiologic conditions. This study aimed to identify factors which explain the kinetic variability observed during robotic simulations of a single human gait motion using a sample of human cadaver knees. Twelve human cadaver limbs (58 ± 16 years) were subjected to tibiofemoral geometrical analysis and cyclical stiffness testing in each anatomical degree of freedom...
November 20, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/29157247/effects-of-implant-length-and-3d-bone-to-implant-contact-on-initial-stabilities-of-dental-implant-a-microcomputed-tomography-study
#3
Jui-Ting Hsu, Aaron Yu-Jen Wu, Lih-Jyh Fuh, Heng-Li Huang
BACKGROUND: The influences of potential bone-to-implant contact (BIC) area (pBICA), BIC area (BICA), and three dimensional (3D) BIC percentage (3D BIC%; defined as BICA divided by pBICA) in relation to the implant length on initial implant stability were studied. Correlations between these parameters were also evaluated. METHODS: Implants with lengths of 8.5, 10, 11.5, and 13 mm were placed in artificial bone specimens to measure three indexes of the initial implant stability: insertion torque value (ITV), Periotest value (PTV), and implant stability quotient (ISQ)...
November 21, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/29152521/isokinetic-strength-deficit-6-months-after-adductor-canal-blockade-for-anterior-cruciate-ligament-reconstruction
#4
James E Christensen, Natalie E Taylor, Scott J Hetzel, John A Shepler, Tamara A Scerpella
Background: Recent evidence shows a delayed return to sport in children and delayed quadriceps recovery in both adults and children who have undergone anterior cruciate ligament (ACL) reconstruction with concomitant femoral nerve blockade (FNB) compared with those who had no blockade. We evaluated the use of adductor canal blockade (ACB), as an alternative to FNB, at the time of ACL reconstruction. Hypothesis: Patients who receive ACB will have greater isokinetic strength at 6 months postoperative compared with patients who receive FNB at the time of ACL reconstruction...
November 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29149213/optimal-design-and-control-of-an-electromechanical-transfemoral-prosthesis-with-energy-regeneration
#5
Farbod Rohani, Hanz Richter, Antonie J van den Bogert
In this paper, we present the design of an electromechanical above-knee active prosthesis with energy storage and regeneration. The system consists of geared knee and ankle motors, parallel springs for each motor, an ultracapacitor, and controllable four-quadrant power converters. The goal is to maximize the performance of the system by finding optimal controls and design parameters. A model of the system dynamics was developed, and used to solve a combined trajectory and design optimization problem. The objectives of the optimization were to minimize tracking error relative to human joint motions, as well as energy use...
2017: PloS One
https://www.readbyqxmd.com/read/29149204/evaluation-of-osseous-integration-of-titanium-orthopedic-screws-with-novel-sla-treatment-in-porcine-model
#6
Tzu-Hsiang Lin, Hsin-Tai Hu, Hsueh-Chun Wang, Meng-Chian Wu, Shu-Wei Wu, Ming-Long Yeh
The success of many endosseous implants in orthopaedic and dental applications depends on the surface characteristics, as they affect osseous integration. Previous investigations indicated that a novel large-grit sand-blasted and acid-etched (SLA) titanium (denoted as SLAffinity-Ti) implant had better bone integration than that of a comparably shaped implant with a plasma-sprayed titanium surface. The purpose of the present investigation was to create a SLAffinity surface on pedicle screws and trauma screws and to compare it with the surfaces of a sand-blasted-only implant and commercial implants in terms of bone integration...
2017: PloS One
https://www.readbyqxmd.com/read/29148808/detection-of-short-waved-spin-waves-in-individual-microscopic-spin-wave-waveguides-using-the-inverse-spin-hall-effect
#7
Thomas Brächer, Mathieu Fabre, Thomas Meyer, Tobias Fischer, Stéphane Auffret, Olivier Boulle, Ursula Ebels, Philipp Pirro, Gilles Gaudin
The miniaturization of CMOS devices becomes increasingly difficult due to fundamental limitations and the increase of leakage currents. Large research efforts are devoted to find alternative concepts that allow for a larger data-density and lower power consumption than conventional semiconductor approaches. Spin waves have been identified as a potential technology that can complement and outperform CMOS in complex logic applications, profiting from the fact that these waves enable wave computing on the nano-scale...
November 17, 2017: Nano Letters
https://www.readbyqxmd.com/read/29148611/biomechanical-investigation-of-the-modified-tardieu-scale-in-assessing-knee-extensor-spasticity-poststroke
#8
Samaneh Gholami, Noureddin Nakhostin Ansari, Soofia Naghdi, Azadeh Tabatabaei, Davood Jannat, Maryam Senobari, Mahdi Dadgoo
OBJECTIVE: The modified Tardieu Scale (MTS) is a clinical tool for the measurement of muscle spasticity. The present study aimed to investigate the relationship between the MTS and the slope of the work-velocity curve as a biomechanical measure in assessing knee extensor muscle spasticity in patients with stroke. METHODS: Thirty patients with stroke (22 female, 8 male; mean age 55.4 ± 12.0 years) participated in this study. The knee extensor spasticity was assessed with the MTS...
November 17, 2017: Physiotherapy Research International: the Journal for Researchers and Clinicians in Physical Therapy
https://www.readbyqxmd.com/read/29147876/objective-differences-in-colonoscopy-technique-between-trainee-and-expert-endoscopists-using-the-colonoscopy-force-monitor
#9
Alexander R Ende, Piet De Groen, Bryan L Balmadrid, Joo Ha Hwang, John Inadomi, Tomasz Wojtera, Vladimir Egorov, Noune Sarvazyan, Louis Korman
BACKGROUND: Learning to perform colonoscopy safely and effectively is central to gastroenterology fellowship programs. The application of force to the colonoscope is an important part of colonoscopy technique. AIMS: We compared force application during colonoscopy between novice and expert endoscopists using a novel device to determine differences in colonoscopy technique. METHODS: This is an observational cohort study designed to compare force application during colonoscopy between novice and experienced trainees, made up of gastroenterology fellows from two training programs, and expert endoscopists from both academic and private practice settings...
November 17, 2017: Digestive Diseases and Sciences
https://www.readbyqxmd.com/read/29147670/isokinetic-extension-strength-is-associated-with-single-leg-vertical-jump-height
#10
Felix Fischer, Cornelia Blank, Tobias Dünnwald, Peter Gföller, Elmar Herbst, Christian Hoser, Christian Fink
Background: Isokinetic strength testing is an important tool in the evaluation of the physical capacities of athletes as well as for decision making regarding return to sports after anterior cruciate ligament (ACL) reconstruction in both athletes and the lay population. However, isokinetic testing is time consuming and requires special testing equipment. Hypothesis: A single-jump test, regardless of leg dominance, may provide information regarding knee extension strength through the use of correlation analysis of jump height and peak torque of isokinetic muscle strength...
November 2017: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29146894/odd-viscosity-in-chiral-active-fluids
#11
Debarghya Banerjee, Anton Souslov, Alexander G Abanov, Vincenzo Vitelli
We study the hydrodynamics of fluids composed of self-spinning objects such as chiral grains or colloidal particles subject to torques. These chiral active fluids break both parity and time-reversal symmetries in their non-equilibrium steady states. As a result, the constitutive relations of chiral active media display a dissipationless linear-response coefficient called odd (or equivalently, Hall) viscosity. This odd viscosity does not lead to energy dissipation, but gives rise to a flow perpendicular to applied pressure...
November 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/29146686/specific-force-of-the-vastus-lateralis-in-adults-with-achondroplasia
#12
David Thomas Sims, Gladys L Onambele-Pearson, Adrian Burden, Carl Payton, Christopher I Morse
Achondroplasia is a clinical condition defined by shorter stature and disproportionate limb length. Force production in able-bodied individuals (controls) is proportional to muscle size, but given the disproportionate nature of Achondroplasia, normalising to anatomical cross sectional area (ACSA) is inappropriate. The aim of this study was to assess specific force of the vastus lateralis (VL) in 10 adults with Achondroplasia (22 ±3 yrs) and 18 gender matched controls (22 ±2 yrs). Isometric torque (iMVCτ) of the dominant knee extensors (KE) and in vivo measures of VL muscle architecture, volume, activation and patella tendon moment arm were used to calculate VL physiological CSA (PCSA), fascicle force and specific force in both groups...
November 16, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/29145963/functional-results-and-isokinetic-muscle-strength-in-patients-with-fraser-type-i-floating-knee-treated-with-internal-fixation
#13
Fernando Brandao Andrade-Silva, Adriana Carvalho, Caio Mansano, Aline Giese, Marcos de Camargo Leonhardt, Dennis Barbosa, Kodi Edson Kojima, Jorge Santos Silva
INTRODUCTION: According to Fraser's description, ipsilateral femoral and tibial diaphyseal fractures are characterised as type I floating knee and have a better prognosis than fractures with joint involvement (type II). There are few reports of functional and muscle strength in these patients. The objective of this study was to evaluate the functional and isokinetic muscle strength of patients with type I floating knee undergoing femoral and tibial internal fixation. METHODS: Patients with type I floating knee undergoing concomitant femoral and tibial internal fixation were invited for clinical evaluation...
October 2017: Injury
https://www.readbyqxmd.com/read/29145876/standing-on-slopes-how-current-microprocessor-controlled-prosthetic-feet-support-transtibial-and-transfemoral-amputees-in-an-everyday-task
#14
Michael Ernst, Björn Altenburg, Malte Bellmann, Thomas Schmalz
BACKGROUND: Conventional prosthetic feet like energy storage and return feet provide only a limited range of ankle motion compared to human ones. In order to overcome the poor rotational adaptability, prosthetic manufacturers developed different prosthetic feet with an additional rotational joint and implemented active control in different states. It was the aim of the study to investigate to what extent these commercially available microprocessor-controlled prosthetic feet support a natural posture while standing on inclines and which concept is most beneficial for lower limb amputees...
November 16, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/29144551/the-impact-of-volumetric-muscle-loss-injury-on-persistent-motoneuron-axotomy
#15
Benjamin T Corona, Kate E Flanagan, Christian M Brininger, Stephen M Goldman, Jarrod A Call, Sarah M Greising
INTRODUCTION: Volumetric muscle loss (VML) occurs following significant traumatic injury or surgical removal of skeletal muscle, resulting in non-recoverable loss of tissue and long-term dysfunction. Perhaps less recognized is that VML injuries inherently disrupt the neuromuscular unit, resulting in fiber denervation and presumptive motor unit rearrangement, expansion, and/or loss. To characterize neural dysfunction we quantified motoneuron axotomy, in efforts to understand how this relates to the temporal coordination of neuromuscular and morphological alterations due to injury...
November 16, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/29143186/identification-of-an-anellovirus-and-genomoviruses-in-ixodid-ticks
#16
Kara Waits, Marten J Edwards, Ilaria N Cobb, Rafaela S Fontenele, Arvind Varsani
Ticks are blood-feeding arachnids that are vectors of several important human and animal pathogens. Little is known about single-stranded DNA (ssDNA) viruses that are associated with these ectoparasites. As part of a pilot study to identify ssDNA viruses present in ticks, female American dog ticks (Dermacentor variabilis) and blacklegged ticks (Ixodes scapularis) were collected in eastern Pennsylvania (USA), and the extracted viral DNA was analyzed using viral metagenomics approaches. Three genomoviruses were recovered from pooled samples of D...
November 15, 2017: Virus Genes
https://www.readbyqxmd.com/read/29140373/clinical-considerations-of-adapted-drilling-protocol-by-bone-quality-perception
#17
Marco Toia, Michele Stocchero, Francesca Cecchinato, Enrico Corrà, Ryo Jimbo, Denis Cecchinato
PURPOSE: To evaluate insertion torque value (ITV) and marginal bone loss (MBL) of an implant system after a clinically perceived bone quality-adapted drilling. MATERIALS AND METHODS: This multicenter retrospective study included patients treated with implants, conventionally loaded, in completely healed sites. Operators customized the osteotomy preparation according to radiographic assessment and their perception of bone quality. Drilling sequence, bone quality, and ITV were recorded at the time of surgery...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29140370/mandibular-bone-structure-analysis-using-cone-beam-computed-tomography-vs-primary-implant-stability-an-ex-vivo-study
#18
Ruben Pauwels, Somchai Sessirisombat, Soontra Panmekiate
PURPOSE: To evaluate the relationship between mandibular bone structure parameters measured on preimplant cone beam computed tomography (CBCT) images and primary implant stability. MATERIALS AND METHODS: Twenty-one hemimandibles were scanned on the 3D Accuitomo 170 CBCT. Next, an implant was placed in each hemimandible, after which insertion torque and implant stability quotient (ISQ) measurements were acquired. The following measurements were performed on the preimplant CBCT scans: bone surface, bone volume, fractal dimension, connectivity, trabecular thickness and spacing, and skeleton analysis...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29140169/relationship-between-physical-therapy-characteristics-surgical-procedure-and-clinical-outcomes-in-patients-after-acl-reconstruction
#19
Ian J Dempsey, Grant E Norte, Matthew Hall, John Goetschius, Lindsay V Slater, Jourdan M Cancienne, Brian C Werner, David R Diduch, Joseph M Hart
CONTEXT: Post-operative rehabilitation is critical to optimize outcomes after anterior cruciate ligament reconstruction (ACLR). However, the relationship between physical therapy (PT) and clinical outcomes is unclear. OBJECTIVE: To describe PT characteristics following ACLR, and assess the relationships between PT characteristics, surgical procedure, and clinical outcomes. DESIGN: Cross-sectional. SETTING: Laboratory...
November 15, 2017: Journal of Sport Rehabilitation
https://www.readbyqxmd.com/read/29139316/association-of-gastrocnemius-muscle-stiffness-with-passive-ankle-joint-stiffness-and-sex-related-difference-in-the-joint-stiffness
#20
Kintaro Chino, Hideyuki Takashi
Passive ankle joint stiffness is affected by all structures located within and over the joint, and is greater in men than in women. Localized muscle stiffness can be assessed by ultrasound shear wave elastography, and muscle architecture such as fascicle length and pennation angle can be measured by B-mode ultrasonography. Thus, we assessed localized muscle stiffness of the medial gastrocnemius (MG) with consideration of individual variability in the muscle architecture, and examined the association of the muscle stiffness with passive ankle joint stiffness and the sex-related difference in the joint stiffness...
November 15, 2017: Journal of Applied Biomechanics
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