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Implant passivity

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https://www.readbyqxmd.com/read/28638348/the-redox-balance-in-erythrocytes-plasma-and-periosteum-of-patients-with-titanium-fixation-of-the-jaw
#1
Jan Borys, Mateusz Maciejczyk, Adam J Krȩtowski, Bozena Antonowicz, Wioletta Ratajczak-Wrona, Ewa Jabłońska, Piotr Załęski, Danuta Waszkiel, Jerzy R Ładny, Piotr Żukowski, Anna Zalewska
Titanium miniplates and screws are commonly used for fixation of jaw fractured or osteotomies. Despite the opinion of their biocompatibility, in clinical practice symptoms of chronic inflammation around the fixation develop in some patients, even many years after the application of miniplates and screws. The cause of these complications is still an unanswered question. Taking into account that oxidative stress is one of the toxic action of titanium, we have evaluated the antioxidant barrier as well as oxidative stress in the erythrocytes, plasma and periosteum covering the titanium fixation of the jaw...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28625664/effects-of-different-numbers-of-mini-dental-implants-on-alveolar-ridge-strain-distribution-under-mandibular-implant-retained-overdentures
#2
Pongsakorn Warin, Pimduen Rungsiyakull, Chaiy Rungsiyakull, Pathawee Khongkhunthian
PURPOSE: To investigate the strains around mini-dental implants (MDIs) and retromolar edentulous areas when using different numbers of MDIs in order to retain mandibular overdentures. MATERIALS AND METHODS: Four different prosthetic situations were fabricated on an edentulous mandibular model including a complete denture (CD), and three overdentures, retained by four, three or two MDIs in the interforaminal region with retentive attachments. A static load of 200N was applied on the posterior teeth of the dentures under bilateral or unilateral loading conditions...
June 15, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28624870/translatory-hip-kinematics-measured-with-optoelectronic-surgical-navigation
#3
Sima Zakani, John F Rudan, Randy E Ellis
PURPOSE: An optoelectronic surgical navigation system was used to detect small but measurable translational motion of human hip cadavers in high-range passive motions. Kinematic data were also examined to demonstrate the role of soft tissues in constraining hip translation. METHODS: Twelve cadaver hips were scanned using CT, instrumented for navigation, and passively taken through motion assessment. Center of the femoral head was tracked in the acetabular coordinates...
June 17, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28618432/accuracy-of-digital-vs-conventional-implant-impression-approach-a-three-dimensional-comparative-in-vitro-analysis
#4
Kinga Basaki, Hasan Alkumru, Grace De Souza, Yoav Finer
PURPOSE: To assess the three-dimensional (3D) accuracy and clinical acceptability of implant definitive casts fabricated using a digital impression approach and to compare the results with those of a conventional impression method in a partially edentulous condition. MATERIALS AND METHODS: A mandibular reference model was fabricated with implants in the first premolar and molar positions to simulate a patient with bilateral posterior edentulism. Ten implant-level impressions per method were made using either an intraoral scanner with scanning abutments for the digital approach or an open-tray technique and polyvinylsiloxane material for the conventional approach...
June 14, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28616842/characterization-of-magneto-endosymbionts-as-mri-cell-labeling-and-tracking-agents
#5
Kimberly D Brewer, Ryan Spitler, Kayla R Lee, Andrea C Chan, Joyce C Barrozo, Abdul Wakeel, Chandler S Foote, Steven Machtaler, James Rioux, Juergen K Willmann, Papia Chakraborty, Bradley W Rice, Christopher H Contag, Caleb B Bell, Brian K Rutt
PURPOSE: Magneto-endosymbionts (MEs) show promise as living magnetic resonance imaging (MRI) contrast agents for in vivo cell tracking. Here we characterize the biomedical imaging properties of ME contrast agents, in vitro and in vivo. PROCEDURES: By adapting and engineering magnetotactic bacteria to the intracellular niche, we are creating magneto-endosymbionts (MEs) that offer advantages relative to passive iron-based contrast agents (superparamagnetic iron oxides, SPIOs) for cell tracking...
June 14, 2017: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
https://www.readbyqxmd.com/read/28609507/use-of-intraoral-welding-to-increase-the-predictability-of-immediately-loaded-computer-guided-implants
#6
Alberto Maria Albiero, Renato Benato, Andrea Benato, Marco Degidi
Inaccuracy of computer-guided implant placement may lead to complications when combined with an immediately loaded prefabricated prosthesis. The aim of this case series was to describe the use of an intraoral welding technique to increase the predictability of immediately loaded implants supporting a fixed full-arch prosthesis after computer-guided flapless implant placement. A total of 60 Ankylos plus implants (Dentsply) with a width of 3.5 mm and a length of 8 to 14 mm were placed consecutively in 10 patients...
July 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28579540/a-multi-defense-strategy-enhancing-bactericidal-activity-of-a-medical-grade-polymer-with-a-nitric-oxide-donor-and-surface-immobilized-quaternary-ammonium-compound
#7
Jitendra Pant, Jing Gao, Marcus J Goudie, Sean P Hopkins, Jason Locklin, Hitesh Handa
Although the use of biomedical devices in hospital-based care is inevitable, unfortunately, it is also one of the leading causes of the nosocomial infections, and thus demands development of novel antimicrobial materials for medical device fabrication. In the current study, a multi-defense mechanism against Gram-positive and Gram-negative bacteria is demonstrated by combining a nitric oxide (NO) releasing agent with a quaternary ammonium antimicrobial that can be covalently grafted to medical devices. Antibacterial polymeric composites were fabricated by incorporating an NO donor, S-nitroso-N-acetyl-penicillamine (SNAP) in CarboSil® polymer and top coated with surface immobilized benzophenone based quaternary ammonium antimicrobial (BPAM) small molecule...
June 1, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28579262/contact-forces-in-the-tibiofemoral-joint-from-soft-tissue-tensions-implications-to-soft-tissue-balancing-in-total-knee-arthroplasty
#8
Matthias A Verstraete, Patrick A Meere, Gaia Salvadore, Jan Victor, Peter S Walker
Proper tension of the knee's soft tissue envelope is important during total knee arthroplasty; incorrect tensioning potentially leads to joint stiffness or instability. The latter remains an important trigger for revision surgery. The use of sensors quantifying the intra-articular loads, allows surgeons to assess the ligament tension at the time of surgery. However, realistic target values are missing. In the framework of this paper, eight non-arthritic cadaveric specimens were tested and the intra-articular loads transferred by the medial and lateral compartment were measured using custom sensor modules...
May 23, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28578794/results-at-a-minimum-follow-up-of-5-years-of-a-ligaments-compatible-total-ankle-replacement-design
#9
Sandro Giannini, Matteo Romagnoli, Paolo Barbadoro, Giulio Maria Marcheggiani Muccioli, Matteo Cadossi, Alberto Grassi, Stefano Zaffagnini
BACKGROUND: A new design of 3-part ankle replacement was developed to achieve compatibility with the natural ligaments by allowing certain fibers to remain isometric during passive motion. METHODS: We evaluate 75 ankle prostheses implanted from July 2003 to December 2008, at a mean follow-up 6.5±1.1years (range 5-9 years). The mean age at surgery was 62±13years (range 29-82). RESULTS: The mean AOFAS scores achieved at pre-op and at last follow-up were respectively 37±5 (23-45) and 78±8 (64-98)...
June 2017: Foot and Ankle Surgery: Official Journal of the European Society of Foot and Ankle Surgeons
https://www.readbyqxmd.com/read/28536516/multi-regional-adaptation-in-human-auditory-association-cortex
#10
Urszula Malinowska, Nathan E Crone, Frederick A Lenz, Mackenzie Cervenka, Dana Boatman-Reich
In auditory cortex, neural responses decrease with stimulus repetition, known as adaptation. Adaptation is thought to facilitate detection of novel sounds and improve perception in noisy environments. Although it is well established that adaptation occurs in primary auditory cortex, it is not known whether adaptation also occurs in higher auditory areas involved in processing complex sounds, such as speech. Resolving this issue is important for understanding the neural bases of adaptation and to avoid potential post-operative deficits after temporal lobe surgery for treatment of focal epilepsy...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28532901/long-term-surveillance-of-zinc-implant-in-murine-artery-surprisingly-steady-biocorrosion-rate
#11
Adam J Drelich, Shan Zhao, Roger J Guillory, Jaroslaw W Drelich, Jeremy Goldman
Metallic zinc implanted into the abdominal aorta of rats out to 6months has been demonstrated to degrade while avoiding responses commonly associated with the restenosis of vascular implants. However, major questions remain regarding whether a zinc implant would ultimately passivate through the production of stable corrosion products or via a cell mediated fibrous encapsulation process that prevents the diffusion of critical reactants and products at the metal surface. Here, we have conducted clinically relevant long term in vivo studies in order to characterize late stage zinc implant biocorrosion behavior and products to address these critical questions...
May 19, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28532004/corrosion-and-surface-modification-on-biocompatible-metals-a-review
#12
REVIEW
R I M Asri, W S W Harun, M Samykano, N A C Lah, S A C Ghani, F Tarlochan, M R Raza
Corrosion prevention in biomaterials has become crucial particularly to overcome inflammation and allergic reactions caused by the biomaterials' implants towards the human body. When these metal implants contacted with fluidic environments such as bloodstream and tissue of the body, most of them became mutually highly antagonistic and subsequently promotes corrosion. Biocompatible implants are typically made up of metallic, ceramic, composite and polymers. The present paper specifically focuses on biocompatible metals which favorably used as implants such as 316L stainless steel, cobalt-chromium-molybdenum, pure titanium and titanium-based alloys...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28527584/a-combined-passive-and-active-musculoskeletal-model-study-to-estimate-l4-l5-load-sharing
#13
F Azari, N Arjmand, A Shirazi-Adl, T Rahimi-Moghaddam
A number of geometrically-detailed passive finite element (FE) models of the lumbar spine have been developed and validated under in vitro loading conditions. These models are devoid of muscles and thus cannot be directly used to simulate in vivo loading conditions acting on the lumbar joint structures or spinal implants. Gravity loads and muscle forces estimated by a trunk musculoskeletal (MS) model under twelve static activities were applied to a passive FE model of the L4-L5 segment to estimate load sharing among the joint structures (disc, ligaments, and facets) under simulated in vivo loading conditions...
May 11, 2017: Journal of Biomechanics
https://www.readbyqxmd.com/read/28514709/protein-adsorption-on-implant-metals-with-various-deformed-surfaces
#14
Zhongwei Wang, Yu Yan, Lijie Qiao
The adsorption of proteins has great influence on the biocompatibility, lubrication and corrosion properties of implantable metals. The subsurface microstructure of metals can be easily changed during the manufacturing or service processes and it is easily ignored. The same chemical composition but with various surface microstructures can result in very different adsorption behaviour. In this study, mechanical polishing, electrochemical polishing and shot peening methods were used to generate different gradient deformed surfaces for CoCrMo alloys...
May 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28503316/recovery-of-supraspinal-control-of-leg-movement-in-a-chronic-complete-flaccid-paraplegic-man-after-continuous-low-frequency-pelvic-nerve-stimulation-and-fes-assisted-training
#15
Marc Possover, Axel Forman
INTRODUCTION: More than 30 years ago, functional electrical stimulation (FES) was developed as an orthotic system to be used for rehabilitation for SCI patients. In the present case report, FES-assisted training was combined with continuous low-frequency stimulation of the pelvic somatic nerves in a SCI patient. CASE PRESENTATION: We report on unexpected findings in a 41-year-old man with chronic complete flaccid paraplegia, since he was 18 years old, who underwent spinal stem cell therapy and a laparoscopic implantation of neuroprosthesis (LION procedure) in the pelvic lumbosacral nerves...
2017: Spinal Cord Series and Cases
https://www.readbyqxmd.com/read/28480611/corrosion-behavior-of-surface-modifications-on-titanium-dental-implant-in-situ-bacteria-monitoring-by-electrochemical-techniques
#16
Ivan Díaz, Miguel Ángel Pacha-Olivenza, Ricardo Tejero, Eduardo Anitua, Maria Luisa González-Martín, Maria Lorenza Escudero, Maria Cristina García-Alonso
The effects of surface modifications and bacteria on the corrosion behavior of titanium have been studied. Five surface modifications were analyzed: two acid etchings (op V, op N), acid etching + anodic oxidation (op NT), sandblasting + acid etching (SLA), and machined surfaces (mach). The corrosion behavior of the surface modifications was evaluated by following the standard ANSI/AAMI/ISO 10993-15:2000. Cyclic potentiodynamic and potentiostatic anodic polarization tests and ion release by ICP-OES after immersion for 7 days in 0...
May 8, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28478986/retrospective-cross-sectional-study-on-immediately-loaded-implant-supported-mandibular-fixed-complete-arch-prostheses-fabricated-with-the-passive-fit-cementation-technique
#17
Francine Baldin Able, Ivete Aparecida de Mattias Sartori, Geninho Thomé, Ana Cláudia Moreira Melo
STATEMENT OF PROBLEM: Mandibular fixed complete-arch dental prostheses on dental implants have been benefiting patients for a long time, but problems with passive fitting between the metallic framework of the prostheses and the implants might influence its long-term success. PURPOSE: The purpose of this cross-sectional study of immediately loaded mandibular fixed complete-arch dental prostheses was to evaluate the survival and success rates of prostheses, the survival rates of dental implants, the occurrence of complications in the prostheses and implants, participant satisfaction, and the association between cantilever length and prosthesis complications...
May 5, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28474107/-foot-drop-treatment-by-implantation-of-a%C3%A2-neuroprosthesis-actigait%C3%A2
#18
D Yao, E Jakubowitz, S Ettinger, C Plaass, C Stukenborg-Colsman, K Daniilidis
OBJECTIVE: Gait improvement by restoring dorsiflexion using a neuroprosthesis implant. INDICATIONS: Foot drop with damage to the 1st motor neuron; passive mobility in ankle is possible; adult patients. CONTRAINDICATIONS: Foot drop with peripheral damage and injury to the peroneal nerve; already implanted stimulators (e.g., defibrillator, pacemaker, or pain stimulator); severe anesthesia risks in multimorbid patients. SURGICAL TECHNIQUE: Surgery in lateral position...
May 4, 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28468134/use-of-acellular-dermal-matrix-in-treatment-of-congenital-muscular-torticollis-in-patients-over-eight-years-of-age
#19
Hyung Min Hahn, Kyung Hoon Cook, Il Jae Lee, Dong Ha Park, Myong Chul Park
BACKGROUND: Treatment for neglected or recurred congenital muscular torticollis should be differentiated from primary patients due to the long-standing adjacent tissue contracture. The aim of this study was to evaluate the effect of acellular dermal matrix (ADM) on surgery of recurred and neglected patients of congenital muscular torticollis. METHODS: Forty-nine patients were included in the study. All patients underwent resection at the distal end of the sternocleidomastoid muscle...
May 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28451588/lead-extraction-of-cardiac-rhythm-devices-a-report-of-a-single-center-experience
#20
Ana Isabel Azevedo, João Primo, Helena Gonçalves, Marco Oliveira, Luís Adão, Elisabeth Santos, José Ribeiro, Marlene Fonseca, Adelaide V Dias, Luís Vouga, Vasco Gama Ribeiro
INTRODUCTION AND OBJECTIVES: The rate of implanted cardiac electronic devices is increasing as is the need to manage long-term complications. Lead removal is becoming an effective approach to treat such complications. We present our experience in lead removal using different approaches, analyzing the predictors of the use of mechanical extractors/surgical removal. METHODS: Retrospective analysis of lead extractions in a series of 76 consecutive patients (mean age 70...
2017: Frontiers in Cardiovascular Medicine
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