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https://www.readbyqxmd.com/read/28087408/effects-of-loading-concentration-blood-and-synovial-fluid-on-antibiotic-release-and-anti-biofilm-activity-of-bone-cement-beads
#1
Devendra Dusane, Scott Diamond, Cory Knecht, Nicholas Farrar, Casey Peters, Robert Howlin, Matthew Swearingen, Jason Calhoun, Roger D Plaut, Tanya Nocera, Jeffrey Granger, Paul Stoodley
Antibiotic loaded cement beads are commonly used for the treatment of biofilm related orthopaedic periprosthetic infections; however the effects of antibiotic loading and exposure of beads to body fluids on release kinetics are unclear. The purpose of this study was to determine the effects of (i) antibiotic loading density (ii) loading amount (iii) material type and (iv) exposure to body fluids (blood or synovial fluid) on release kinetics and efficacy of antibiotics against planktonic and lawn biofilm bacteria...
January 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28078363/short-term-outcome-after-total-hip-arthroplasty-using-dual-mobility-cup-report-from-lithuanian-arthroplasty-register
#2
Sarunas Tarasevicius, Alfredas Smailys, Kazimieras Grigaitis, Otto Robertsson, Justinas Stucinskas
PURPOSE: The purpose of the study was to investigate how the use of dual-mobility cups (DMCs) affected the risk of revision due to dislocation as well as overall risk of revision compared with a conventional total hip arthroplasty (THA) system in the short term. METHODS: A total of 12,657 primary THAs were registered from the start of 2011 to the end of 2014. 620 THAs were with DMCs. For comparison, we included all registered THAs with Exeter cup and a cemented Exeter stem combined with 28-mm femoral head...
January 12, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28078362/use-of-dual-mobility-cup-in-revision-hip-arthroplasty-reduces-the-risk-for-further-dislocation-analysis-of-seven-hundred-and-ninety-one-first-time-revisions-performed-due-to-dislocation-reported-to-the-swedish-hip-arthroplasty-register
#3
Maziar Mohaddes, Peter Cnudde, Ola Rolfson, Alexander Wall, Johan Kärrholm
PURPOSE: Dislocation after total hip arthroplasty (THA) is a common reason for revision. The last decade fostered a significant increase in the use of dual-mobility cups (DMCs). Here we report our study on the short-term survival rate of a cemented DMC reported to the Swedish Hip Arthroplasty Register (SHAR) compared with other cemented designs used in first-time revision due to dislocation. METHODS: During 2005-2015, 984 first-time revisions for dislocation were reported to SHAR...
January 11, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28077884/chemical-vs-physical-acceleration-of-cement-hydration
#4
Dale P Bentz, Franco Zunino, Didier Lootens
Cold weather concreting often requires the use of chemical accelerators to speed up the hydration reactions of the cement, so that setting and early-age strength development will occur in a timely manner. While calcium chloride (dihydrate - CaCl2·2H2O) is the most commonly used chemical accelerator, recent research using fine limestone powders has indicated their high proficiency for physically accelerating early-age hydration and reducing setting times. This paper presents a comparative study of the efficiency of these two approaches in accelerating hydration (as assessed via isothermal calorimetry), reducing setting times (Vicat needle), and increasing early-age mortar cube strength (1 d and 7 d)...
November 2016: Concr Int
https://www.readbyqxmd.com/read/28077394/metal-backed-versus-all-polyethylene-unicompartmental-knee-arthroplasty-proximal-tibial-strain-in-an-experimentally-validated-finite-element-model
#5
C E H Scott, M J Eaton, R W Nutton, F A Wade, S L Evans, P Pankaj
OBJECTIVES: Up to 40% of unicompartmental knee arthroplasty (UKA) revisions are performed for unexplained pain which may be caused by elevated proximal tibial bone strain. This study investigates the effect of tibial component metal backing and polyethylene thickness on bone strain in a cemented fixed-bearing medial UKA using a finite element model (FEM) validated experimentally by digital image correlation (DIC) and acoustic emission (AE). MATERIALS AND METHODS: A total of ten composite tibias implanted with all-polyethylene (AP) and metal-backed (MB) tibial components were loaded to 2500 N...
January 2017: Bone & Joint Research
https://www.readbyqxmd.com/read/28077291/in-vitro-dentin-barrier-cytotoxicity-testing-of-some-dental-restorative-materials
#6
R D Jiang, H Lin, G Zheng, X M Zhang, Q Du, M Yang
OBJECTIVES: To investigate the cytotoxicity of four dental restorative materials in three-dimensional (3D) L929 cell cultures using a dentin barrier test. METHODS: The cytotoxicities of light-cured glass ionomer cement (Vitrebond), total-etching adhesive (GLUMA Bond5), and two self-etching adhesives (GLUMA Self Etch and Single Bond Universal) were evaluated. The permeabilities of human dentin disks with thicknesses of 300, 500, and 1000μm were standardized using a hydraulic device...
January 8, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28076496/evaluation-of-dentin-hypersensitivity-treatment-with-glass-ionomer-cements-a-randomized-clinical-trial
#7
Marina de Matos Madruga, Adriana Fernandes da Silva, Wellington Luiz de Oliveira da Rosa, Evandro Piva, Rafael Guerra Lund
A randomized, double-blind, split-mouth clinical trial was performed compared the desensitizing efficacy of the resin-modified glass ionomer cement (GIC) ClinproTM XT (3M ESPE, Minnesota, USA) and the conventional GIC Vidrion R (SS White, Gloucester, UK) in a 6-month follow-up. Subjects were required to have at least two teeth with dentin hypersensitivity. Teeth were divided at random into 2 groups, one group received Clinpro XT and the other conventional GIC Vidrion R. Treatments were assessed by tactile and air blast tests using Visual Analogue Scale (VAS) at baseline, after 20 minutes, and at 7, 15, 21, 30, 90 and 180 days post-treatment...
January 5, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28074386/the-effect-of-ceramic-thickness-and-resin-cement-shades-on-the-color-matching-of-ceramic-veneers-in-discolored-teeth
#8
Wenzhong Xing, Xiaodong Chen, Dafei Ren, Kangru Zhan, Yining Wang
The objective of this study was to analyze the effects of ceramic material thickness and resin cement shade on the color matching of ceramic veneers at the gray tooth structures. Seventy-two artificial maxillary right central incisor teeth (C2 shade) were prepared according to veneer tooth preparation in practice. Ceramic materials (LT, A2 shade, IPS e.max Press) were selected to fabricate the 0.50- and 0.75-mm thick veneers at the body region. The ceramic veneer specimens were bonded to the artificial teeth by the 6 shades of resin cements (Variolink Veneer: shades of HV+3, LV-2, LV-3; and RelyX(TM) Veneer: shades of WO, TR, A3)...
January 10, 2017: Odontology
https://www.readbyqxmd.com/read/28073094/the-role-of-lesser-trochanter-fragment-in-unstable-pertrochanteric-a2-proximal-femur-fractures-is-refixation-of-the-lesser-trochanter-worth-the-effort
#9
Christian Ehrnthaller, Alain Christoph Olivier, Florian Gebhard, Lutz Dürselen
BACKGROUND: Instability of osteoporotic pertrochanteric fractures is defined by loss of medial/lateral cortical integrity with the posteromedial fragment including the lesser trochanter being pivotal for load distribution. Literature addressing the importance of lesser trochanter refixation is scarce. To clarify the effect of lesser trochanter refixation on primary stability in these fractures, following study was performed. METHODS: 21 femora were match-paired in 3 groups and osteotomized, creating pertrochanteric fractures (AO-31A2)...
December 30, 2016: Clinical Biomechanics
https://www.readbyqxmd.com/read/28072486/radiopacity-of-composite-luting-cements-using-a-digital-technique
#10
Walter Dukic
PURPOSE: The aim of this in vitro study was to evaluate the radiopacity of 20 common dental composite luting materials using a digital technique. MATERIALS AND METHODS: A 1-mm-thick specimen of each material with a human tooth slice and aluminium step wedge were tested using digital radiographs under four combinations of exposure and voltage. The radiopacity in pixels was determined using computer software. The equivalent thickness of aluminium for each material was then calculated based on the calibration curve...
January 10, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28070681/comparison-of-the-18-month-outcome-after-the-treatment-of-osteoporotic-insufficiency-fractures-by-means-of-balloon-sacroplasty-bsp-and-radiofrequency-sacroplasty-rfs-in-comparison-a-prospective-randomised-study
#11
Reimer Andresen, Sebastian Radmer, Julian Ramin Andresen, Hans-Christof Schober
PURPOSE: The objective of this prospective, randomised study was to examine the feasibility and clinical outcome of balloon sacroplasty and radiofrequency sacroplasty. METHODS: In 40 patients with a total of 57 sacral fractures, CT-guided cement augmentation was performed by means of BSP or RFS. For BSP, the balloon catheter was inflated and deflated in the fracture zone, and the hollow space, thus, created was then filled with PMMA cement. For RFS, the spongious space in the fracture zone was initially extended using a flexible osteotome, and the highly viscous PMMA cement, activated by radiofrequency, was then inserted into the prepared fracture zone...
January 9, 2017: European Spine Journal
https://www.readbyqxmd.com/read/28070650/revision-total-knee-arthroplasty-due-to-bone-cement-and-metal-hypersensitivity
#12
Ioannis P Stathopoulos, Nicolaos Andrianopoulos, Dimitrios Paschaloglou, Ioannis Tsarouchas
INTRODUCTION: Hypersensitivity to implants is a rare complication of total knee arthroplasty (TKA). Metal and, less frequently, bone cement can produce allergic symptomatology that if unresponsive to conservative treatment could lead to revision. MATERIALS AND METHODS: We present the case of a patient with generalized pruritus and metal taste starting during the first postoperative month after TKA. Dermal allergy exams revealed that the patient had hypersensitivity to nickel sulphate and cobalt chloride and bone cement...
January 9, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28068271/significant-shear-bond-strength-improvements-of-a-resin-modified-glass-ionomer-cement-with-a-resin-coating
#13
Michael T Stallings, Daniel C Stoeckel, Kenneth G Rawson, Dan B Welch
Previous evidence has suggested that resin-modified glass ionomer cements (RMGICs) may be sensitive to temperature and moisture changes for the first 24 hours after photopolymerization. To test the hypothesis that a resin coating placed over the surface of an RMGIC restoration would decrease the susceptibility to moisture and temperature conditions, 44 RMGIC samples were prepared in inverted-cone recesses drilled in epoxy resin plates. After abrasion of all samples with 800-grit silicon carbide paper to simulate a diamond bur finish on the surface, a coat of highly filled resin was applied to the experimental group (n = 22) and cured according to the manufacturer's instructions...
January 2017: General Dentistry
https://www.readbyqxmd.com/read/28067979/comparing-fracture-resistance-and-the-time-required-for-two-different-fiber-post-removal-systems
#14
Seda Aydemir, Göze Arukaslan, Serkan Sarıdağ, Işıl Kaya-Büyükbayram, Yasemin Ylıdıran
PURPOSE: To compare two fiber post removal techniques in terms of fracture resistance and time required for post removal. MATERIALS AND METHODS: Post space was prepared to a 9-mm depth in each root canal. The roots were randomly divided into three groups of 15 specimens each. D.T. Light-Posts were cemented in all groups. In group 1, fiber posts were removed using the D.T. Light-Post-removal kit; in group 2, Start-X stainless-steel ultrasonic tips were used. In group 3, fiber posts were left without removal (the control group)...
January 9, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28067250/promotion-of-natural-tooth-repair-by-small-molecule-gsk3-antagonists
#15
Vitor C M Neves, Rebecca Babb, Dhivya Chandrasekaran, Paul T Sharpe
The restoration of dentine lost in deep caries lesions in teeth is a routine and common treatment that involves the use of inorganic cements based on calcium or silicon-based mineral aggregates. Such cements remain in the tooth and fail to degrade and thus normal mineral volume is never completely restored. Here we describe a novel, biological approach to dentine restoration that stimulates the natural formation of reparative dentine via the mobilisation of resident stem cells in the tooth pulp. Biodegradable, clinically-approved collagen sponges are used to deliver low doses of small molecule glycogen synthase kinase (GSK-3) antagonists that promote the natural processes of reparative dentine formation to completely restore dentine...
January 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28067099/dynamic-rsa-for-the-evaluation-of-inducible-micromotion-of-oxford-uka-during-step-up-and-step-down-motion
#16
Kristian Horsager, Bart L Kaptein, Lone RøMer, Peter B Jørgensen, Maiken Stilling
Background and purpose - Implant inducible micromotions have been suggested to reflect the quality of the fixation interface. We investigated the usability of dynamic RSA for evaluation of inducible micromotions of the Oxford Unicompartmental Knee Arthroplasty (UKA) tibial component, and evaluated factors that have been suggested to compromise the fixation, such as fixation method, component alignment, and radiolucent lines (RLLs). Patients and methods - 15 patients (12 men) with a mean age of 69 (55-86) years, with an Oxford UKA (7 cemented), were studied after a mean time in situ of 4...
January 9, 2017: Acta Orthopaedica
https://www.readbyqxmd.com/read/28063520/zeta-potential-of-artificial-and-natural-calcite-in-aqueous-solution
#17
REVIEW
Dawoud Al Mahrouqi, Jan Vinogradov, Matthew D Jackson
Despite the broad range of interest and applications, controls on calcite surface charge in aqueous solution, especially at conditions relevant to natural systems, remain poorly understood. The primary data source to understand calcite surface charge comprises measurements of zeta potential. Here we collate and review previous measurements of zeta potential on natural and artificial calcite and carbonate as a resource for future studies, compare and contrast the results of these studies to determine key controls on zeta potential and where uncertainties remain, and report new measurements of zeta potential relevant to natural subsurface systems...
December 26, 2016: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28063179/integrated-carbon-sulfur-and-nitrogen-isotope-chemostratigraphy-of-the-ediacaran-lantian-formation-in-south-china-spatial-gradient-ocean-redox-oscillation-and-fossil-distribution
#18
W Wang, C Guan, C Zhou, Y Peng, L M Pratt, X Chen, L Chen, Z Chen, X Yuan, S Xiao
The Ediacaran Doushantuo Formation in South China is a prime target for geobiological investigation because it offers opportunities to integrate chemostratigraphic and paleobiological data. Previous studies were mostly focused on successions in shallow-water shelf facies, but data from deep-water successions are needed to fully understand basinal redox structures. Here, we report δ(13) Ccarb , δ(13) Corg , δ(34) Spyr , δ(34) SCAS , and δ(15) Nsed data from a drill core of the fossiliferous Lantian Formation, which is a deep-water equivalent of the Doushantuo Formation...
January 6, 2017: Geobiology
https://www.readbyqxmd.com/read/28062151/comparable-results-with-porous-metal-augments-in-combination-with-either-cemented-or-uncemented-cups-in-revision-hip-arthroplasty-an-analysis-of-one-hundred-forty-seven-revisions-at-a-mean-of-five-years
#19
Ahmed Nageeb Mahmoud, Martin Sundberg, Gunnar Flivik
BACKGROUND: Porous metal augments have been used successfully for management of large acetabular defects during revision hip arthroplasty. The purpose of this study was to retrospectively review and compare the clinical and radiographic outcomes of porous metal augments in cemented and uncemented acetabular revisions, all performed at the same institution. METHODS: Using our institutional clinical databases, the clinical and radiological outcomes of 104 cemented and 43 uncemented acetabular revisions with metal augments, performed between 2006 and 2015, were studied and compared...
December 18, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28059442/hydroxyapatite-cement-cranioplasty-following-translabyrinthine-approach-long-term-study-of-369-cases
#20
Peter G Volsky, Todd A Hillman, Kellen J Stromberg, Farrel J Buchinsky, Douglas A Chen, Neal M Jackson, Moisés A Arriaga
OBJECTIVE: To report the authors' experience with hydroxyapatite cement (HAC) cranioplasty and analyze the material's long-term safety and efficacy in repairing translabyrinthine skull-base defects by examining adverse events, specifically cerebrospinal fluid (CSF) leaks and surgical site infections. STUDY DESIGN: Retrospective case-control study (primary study arm); prospective cross-sectional study of patients not examined within the last 5 years (secondary arm)...
January 6, 2017: Laryngoscope
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