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Implant passivity

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https://www.readbyqxmd.com/read/28212454/clinical-comparison-of-screw-retained-and-screwless-morse-taper-implant-abutment-connections-one-year-postloading-results
#1
Esma Geckili, Onur Geckili, Hakan Bilhan, Omer Kutay, Tayfun Bilgin
PURPOSE: The purpose of this study was to clinically evaluate the screwless Morse taper implant-abutment connection type, in which the retention screw is totally eliminated, in terms of stability, success, periodontal parameters, and marginal bone levels after 1 year of function by comparing it with a passive fit internal implant-abutment connection, wherein a space exists between the matching components. MATERIALS AND METHODS: Each edentulous subject received an implant with a screwless Morse taper connection (MT) in the left canine area of the mandible and an implant with a screw-retained implant-abutment connection (SR) in the right canine area of the mandible...
February 17, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28188110/accuracy-and-mechanical-performance-of-passivated-and-conventional-fabricated-3-unit-fixed-dental-prosthesis-on-multi-unit-abutments
#2
Michael Stimmelmayr, Julian Groesser, Florian Beuer, Kurt Erdelt, Gerald Krennmair, Caroline Sachs, Daniel Edelhoff, Jan-Frederik Güth
PURPOSE: The aim of this study was to evaluate the fit and mechanical stability of conventional versus passive fitting 3-unit fixed dental prosthesis (FDP) screw-retained on implants. METHODS: Twenty acrylic models, each with two embedded implants, were fabricated and functioned as patient-models. Impressions were taken and 20 all-ceramic FDPs were pre-fabricated on the plaster casts. Respectively 10 FDPs were fixed on the plaster casts (group 1) and on the patient-models for passive fitting (group 2)...
February 7, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28185434/nanoparticle-drug-delivery-systems-for-peritoneal-cancers-a-case-study-of-the-design-characterization-and-development-of-the-expansile-nanoparticle
#3
REVIEW
Aaron H Colby, Nicholas H Oberlies, Cedric J Pearce, Victoria L M Herrera, Yolonda L Colson, Mark W Grinstaff
Nanoparticle (NP)-based drug-delivery systems are frequently employed to improve the intravenous administration of chemotherapy; however, few reports explore their application as an intraperitoneal therapy. We developed a pH-responsive expansile nanoparticle (eNP) specifically designed to leverage the intraperitoneal route of administration to treat intraperitoneal malignancies, such as mesothelioma, ovarian, and pancreatic carcinomatoses. This review describes the design, evaluation, and evolution of the eNP technology and, specifically, a Materials-Based Targeting paradigm that is unique among the many active- and passive-targeting strategies currently employed by NP-delivery systems...
February 9, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28183674/albumin-coatings-by-alternating-current-electrophoretic-deposition-for-improving-corrosion-resistance-and-bioactivity-of-titanium-implants
#4
Sarah Höhn, Annabel Braem, Bram Neirinck, Sannakaisa Virtanen
Although Ti alloys are generally regarded to be highly corrosion resistant, inflammatory conditions following surgery can instigate breakdown of the TiO2 passivation layer leading to an increased metal ion release. Furthermore proteins present in the surrounding tissue will readily adsorb on a titanium surface after implantation. In this paper alternating current electrophoretic deposition (AC-EPD) of bovine serum albumin (BSA) on Ti6Al4V was investigated in order to increase the corrosion resistance and control the protein adsorption capability of the implant surface...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28165427/developing-and-evaluating-a-flexible-wireless-microcoil-array-based-integrated-interface-for-epidural-cortical-stimulation
#5
Xing Wang, Sharjeel A Chaudhry, Wensheng Hou, Xiaofeng Jia
Stroke leads to serious long-term disability. Electrical epidural cortical stimulation has made significant improvements in stroke rehabilitation therapy. We developed a preliminary wireless implantable passive interface, which consists of a stimulating surface electrode, receiving coil, and single flexible passive demodulated circuit printed by flexible printed circuit (FPC) technique and output pulse voltage stimulus by inductively coupling an external circuit. The wireless implantable board was implanted in cats' unilateral epidural space for electrical stimulation of the primary visual cortex (V1) while the evoked responses were recorded on the contralateral V1 using a needle electrode...
February 5, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28157596/fabrication-and-evaluation-of-bulk-nanostructured-cobalt-intended-for-dental-and-orthopedic-implants
#6
Fuzeng Ren, Weiwei Zhu, Kangjie Chu
Bulk nanostructured cobalt (Co) was fabricated by a combination of high energy ball milling and warm pressing. The obtained cobalt has an average grain size of 35nm with measured hardness and elastic modulus of 7.32GPa and 211.4GPa, respectively. Dry sliding wear testing shows such bulk nanostructured Co has high sliding wear resistance. However, electrochemical study shows that such Co has a relatively high corrosion rate and no passive behavior in the artificial saliva solution. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis further reveal that the corrosion product is composed of insoluble cobalt (II) phosphate and cobalt hydroxide...
January 25, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28144717/-individualized-unicondylar-knee-replacement-use-of-patient-specific-implants-and-instruments
#7
J Arnholdt, B M Holzapfel, L Sefrin, M Rudert, J Beckmann, A F Steinert
OBJECTIVE: Unicompartmental knee replacement in patients with osteoarthritis (OA) of the medial compartment. Individualized instruments and implants with a planning protocol for optimal fit. The individualized instruments and implants (ConforMIS Inc.; Burlington, MA, USA) are manufactured based on a computed tomography scan of the affected lower extremity and are provided together with a planning protocol (iView®) of the surgery. INDICATIONS: Unicompartmental OA of the knee (Kellgren & Lawrence stage IV) or Morbus Ahlbäck after unsuccessful conservative or joint preserving surgery...
February 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28144716/bicompartmental-individualized-knee-replacement-use-of-patient-specific-implants-and-instruments-iduo%C3%A2
#8
A F Steinert, J Beckmann, B M Holzapfel, M Rudert, J Arnholdt
OBJECTIVE: Bicompartmental knee replacement in patients with combined osteoarthritis (OA) of the medial or lateral and patellofemoral compartment. Patient-specific instruments and implants (ConforMIS iDuo™) with a planning protocol for optimal implant fit. INDICATIONS: Bicompartmental OA of the knee (Kellgren & Lawrence stage IV) affecting both the medial or lateral and patellofemoral compartment after unsuccessful conservative or joint-preserving surgery. CONTRAINDICATIONS: Tricompartmental OA, knee ligament instabilities, knee deformities >15° (varus, valgus, extension deficit)...
February 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28138717/-patellofemoral-arthroplasty
#9
M Cotic, P Forkel, A B Imhoff
OBJECTIVE: Isolated resurfacing of the trochlea using an inlay prosthesis without changing the complex kinematics of the patellofemoral joint. INDICATIONS: Symptomatic, isolated patellofemoral osteoarthritis or isolated osteochondral lesions, failed conservative and cartilage regeneration procedures. No or concurrently corrected ligament instability, tibiofemoral and patellofemoral malalignment. CONTRAINDICATIONS: Symptomatic patellofemoral osteoarthritis, inflammatory joint disease, chondrocalcinosis, chronic pain syndromes, active infections or knee ankylosis...
February 2017: Operative Orthopädie und Traumatologie
https://www.readbyqxmd.com/read/28106696/use-of-acellular-dermal-matrix-in-treatment-of-congenital-muscular-torticollis-in-patients-over-eight-years-of-age
#10
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...
January 18, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28095914/vascular-mapping-of-the-retroauricular-skin-proposal-for-a-posterior-superior-surgical-incision-for-transcutaneous-bone-conduction-hearing-implants
#11
Adam Perenyi, Zsofia Bere, Janos Jarabin, Balazs Sztano, Edit Kukla, Ziad Bikhazi, Laszlo Tiszlavicz, Ferenc Toth, Jozsef Geza Kiss, Laszlo Rovo
BACKGROUND: Passive transcutaneous osseointegrated hearing implant systems have become increasingly popular more recently. The area over the implant is vulnerable due to vibration and pressure from the externally worn sound processor. Good perfusion and neural integrity has the potential to reduce complications. The authors' objective was to determine the ideal surgical exposure to maintain perfusion and neural integrity and decrease surgical time as a result of reduced bleeding. METHODS: The vascular anatomy of the temporal-parietal soft tissue was examined in a total of 50 subjects...
January 17, 2017: Journal of Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28078394/kinematics-of-a-bicruciate-retaining-total-knee-arthroplasty
#12
Thomas J Heyse, Joshua Slane, Geert Peersman, Margo Dirckx, Arne van de Vyver, Philipp Dworschak, Susanne Fuchs-Winkelmann, Lennart Scheys
PURPOSE: The recently reintroduced bicruciate-retaining Total Knee Arthroplasty (BCR TKA) is an interesting approach in the quest for close replication of knee joint biomechanics and kinematics closer to the native knee. Therefore, this study aimed at providing a detailed biomechanical view on the functional resemblance of BCR TKA to the native knee joint. METHODS: Seven fresh-frozen full leg cadaver specimens (76 ± 10 year) were mounted in a 6 degrees-of-freedom kinematic rig that applied a dynamic squatting motion knee flexion...
January 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28064219/active-and-passive-immunization-against-staphylococcus-aureus-periprosthetic-osteomyelitis-in-rats
#13
Niels H Søe, Nina Vendel Jensen, Asger Lundorff Jensen, Janne Koch, Steen Seier Poulsen, Gerald B Pier, Helle Krogh Johansen
BACKGROUND/AIM: Staphylococcus aureus infection associated with orthopedic implants cannot always be controlled. We used a knee prosthesis model with implant-related osteomyelitis in rats to explore induction of an effective immune response with active and passive immunization. MATERIALS AND METHODS: Fifty-two Sprague-Dawley rats were divided into active (N=28) and passive immunization groups (N=24). A bacterial inoculum of 10(3) S. aureus MN8 was injected into the tibia and the femur marrow before insertion of a non-constrained knee prosthesis in each rat...
January 2017: In Vivo
https://www.readbyqxmd.com/read/28031691/cardiac-tamponade-after-right-ventricular-perforation-caused-by-screw-in-lead
#14
Lovel Giunio, Teo Boric, Cristijan Bulat, Dragan Dragicevic, Mislav Lozo
A 69-year-old man was admitted after syncope followed with chest pain and signs of cardiac tamponade. He had undergone permanent dual-chamber pacemaker implantation 3 weeks earlier. Transthoracic echocardiography (TTE) confirmed a pericardial effusion, and urgent pericardial drainage was performed. Right ventricular perforation caused by active-fixation (screw-in) lead was verified by multislice computed tomography. The lead was extracted under fluoroscopy and bedside TTE monitoring in the operating room with cardiothoracic surgery backup...
December 2016: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28029613/a-mems-condenser-microphone-based-intracochlear-acoustic-receiver
#15
Flurin Pfiffner, Lukas Prochazka, Dominik Peus, Ivo Dobrev, Adrian Dalbert, Jae Hoon Sim, Rahel Kesterke, Joris Walraevens, Francesca Paris, Christof Roosli, Dominik Obrist, A M Huber
GOAL: Intracochlear sound pressure (ICSP) measurements are limited by the small dimensions of the human inner ear and the requirements imposed by the liquid medium. A robust intracochlear acoustic receiver (ICAR) for repeated use with a simple data acquisition system that provides the required high sensitivity and small dimensions does not yet exist. The work described in this report aims to fill this gap and presents a new MEMS condenser microphone (CMIC) based ICAR concept suitable for ICSP measurements in human temporal bones...
December 16, 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28024820/simplified-fabrication-of-an-implant-supported-framework-with-luted-abutment-cylinders
#16
Lambert J Stumpel
A technique is described to generate a framework for an implant-supported fixed complete denture. The main advantage of the described technique is the low production cost of a framework that has high strength, passive fit, and distinct retentive structures for each denture tooth.
December 23, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28024610/alkalescent-nanotube-films-on-a-titanium-based-implant-a-novel-approach-to-enhance-biocompatibility
#17
Yanxian Zhang, Chaofang Dong, Sefei Yang, Junsheng Wu, Kui Xiao, Yunhua Huang, Xiaogang Li
The interfacial pH value has a marked effect on cell viability because the pro-mineralization activity of osteoblasts increases at alkaline extracellular pH, whereas the pro-resorptive activity of osteoclasts increases under more acidic conditions. To obtain the more favorable alkaline interface, we developed a novel nanotube layer that was incorporated with magnesium oxide on a titanium implant substrate (MgO/NT/Ti) via ethylenediamine tetraacetic acid (EDTA) chelation. This facile immersion-annealing process successfully created a homogeneous magnesium oxide layer with sustained release kinetics and superior hydrophilicity according to the surface characterization and microenvironment measurement...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28008765/a-comparative-analysis-of-the-effectiveness-of-active-versus-passive-atrial-lead-fixation-in-chinese-patients-with-cardiac-implantable-electrical-devices-a-long-term-retrospective-observational-single-center-study
#18
Yinglu Hao, Yanping Li, Derong Liao, Ling Yang, Fangyan Liu
BACKGROUND: Data comparing active atrial lead fixation with passive atrial lead fixation in Chinese patients with cardiovascular implantable electronic devices (CIEDs) for atrial pacing is limited. Our study evaluated the effectiveness of active fixation versus passive fixation of atrial leads by observing the lead performance parameters. METHODS: This retrospective, long-term, single-center study included a cohort of Chinese patients who underwent CIED implantation at the Department of Cardiology of People's Hospital of Yuxi City, China, from 1 March 2010 to 1 March 2015...
January 17, 2017: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/27999392/smart-pipe-system-for-a-shipyard-4-0
#19
Paula Fraga-Lamas, Diego Noceda-Davila, Tiago M Fernández-Caramés, Manuel A Díaz-Bouza, Miguel Vilar-Montesinos
As a result of the progressive implantation of the Industry 4.0 paradigm, many industries are experimenting a revolution that shipyards cannot ignore. Therefore, the application of the principles of Industry 4.0 to shipyards are leading to the creation of Shipyards 4.0. Due to this, Navantia, one of the 10 largest shipbuilders in the world, is updating its whole inner workings to keep up with the near-future challenges that a Shipyard 4.0 will have to face. Such challenges can be divided into three groups: the vertical integration of production systems, the horizontal integration of a new generation of value creation networks, and the re-engineering of the entire production chain, making changes that affect the entire life cycle of each piece of a ship...
December 20, 2016: Sensors
https://www.readbyqxmd.com/read/27987778/the-role-of-grain-refinement-and-film-formation-potential-on-the-electrochemical-behavior-of-commercial-pure-titanium-in-hank-s-physiological-solution
#20
Arash Fattah-Alhosseini, Omid Imantalab, Ghazaleh Ansari
In this study, the electrochemical behavior and semiconducting properties of the passive film formed on the nano-grained commercial pure titanium (CP-Ti), successfully made by seven-cycle accumulative roll bonding process, were compared to those for annealed CP-Ti in Hank's physiological solution at 37°C. Polarization plots and electrochemical impedance spectroscopy measurements revealed that the passive behavior of the nano-grained sample was significantly improved in comparison with that of annealed CP-Ti...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
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