keyword
MENU ▼
Read by QxMD icon Read
search

Implant passivity

keyword
https://www.readbyqxmd.com/read/29156072/clinical-and-radiologic-outcomes-of-metatarsophalangeal-hemiarthroplasty-a-review-of-12-consecutive-cases
#1
Florian Wanivenhaus, Jacqueline Fust, Matthias Erschbamer, Andreas Schirm
This study examined function, pain, satisfaction, and radiologic outcomes among patients treated with first metatarsophalangeal hemiarthroplasty. Patients were invited to participate in an outcome study conducted with questionnaires on subjective and objective outcomes and clinical and radiographic follow-up. A total of 12 patients (12 feet; mean patient age, 58.8±12.3 years) agreed to participate. Mean follow-up was 22.3±19.8 months. Of these patients, 7 were satisfied with the postoperative result. The mean visual analog scale pain score decreased significantly from 7...
November 20, 2017: Orthopedics
https://www.readbyqxmd.com/read/29145526/factors-affecting-the-decision-to-use-cemented-or-screw-retained-fixed-implant-supported-prostheses-a-critical-review
#2
Miguel Gómez-Polo, Rocio Ortega, Cristina Gómez-Polo, Alicia Celemin, Jaime Del Rio Highsmith
PURPOSE: This review aimed to compile and enumerate all the factors described in the literature that may affect the decision to use either cemented or screw-retained restorations and to determine the relative weights of each factor by type of retention and prosthesis. MATERIALS AND METHODS: The literature was reviewed, and the factors were classified as either determining (present in a clinical situation in which one of the retention mechanisms was clearly more suitable than the other) or conditioning (present in clinical situations in which one type of restoration was not clearly more advantageous than the other)...
November 16, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29142320/biocompatibility-and-biodegradation-studies-of-a-commercial-zinc-alloy-for-temporary-mini-implant-applications
#3
M Bobby Kannan, Corey Moore, Shruti Saptarshi, Sahadev Somasundaram, Mohamed Rahuma, Andreas L Lopata
In this study, the biocompatibility and in vitro degradation behaviour of a commercial zinc-based alloy (Zn-5 Al-4 Mg) were evaluated and compared with that of pure zinc for temporary orthopaedic implant applications. Biocompatibility tests were conducted using human alveolar lung epithelial cells (A549), which showed that the zinc alloy exhibits similar biocompatibility as compared to pure zinc. In vitro degradation evaluation was performed using weight loss and electrochemical methods in simulated body fluid (SBF) at 37 °C...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29138601/zinc-phosphate-as-a-definitive-cement-for-implant-supported-crowns-and-fixed-dentures
#4
Dennis Flanagan
Implant-supported dental prostheses can be retained by a screw or cement. Implant-supported fixed partial dentures have a passive fit. A passive fit means there is an internal gap between the abutment surface and the intaglio of the retainer to insure that there is no lateral pressure on the supporting implants or friction upon seating of the prosthesis. This gap is filled with cement for retention of the prosthesis. Any lateral pressure may cause marginal bone loss or periimplantitis. Also, there is usually a microscopic gap at the margin of a crown retainer that exposes the cement to oral fluids...
2017: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/29128876/internal-femoral-component-malrotation-in-tka-significantly-alters-tibiofemoral-kinematics
#5
Thomas J Heyse, Bilal F El-Zayat, Ronny De Corte, Yan Chevalier, Susanne Fuchs-Winkelmann, Luc Labey
PURPOSE: Femoral component malrotation in total knee arthroplasty (TKA) is clinically proven to cause dissatisfaction and impaired function. This study is an attempt to characterize the tibiofemoral kinematics following femoral malrotation in posterior stabilized (PS) TKA. It was hypothesized that internal malrotation would introduce the most pronounced changes. METHODS: Six fresh-frozen cadaver specimens were mounted in a kinematic rig. Three motion patterns were applied with the native knee and following PS TKA (passive motion, open chain extension, and squatting) while infrared cameras recorded the trajectories of markers attached to femur and tibia...
November 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29110935/successful-percutaneous-retrieval-of-a-leadless-pacemaker-due-to-an-acute-rise-in-pacing-threshold
#6
Ngai-Yin Chan, Ho-Chuen Yuen, Ngai-Shing Mok
Leadless cardiac pacemakers (LCP) have become available recently. Both its acute and long-term performance in a large population of patients remain to be tested. Subacute rise in pacing threshold has been reported as an uncommon complication. On the other hand, the retrieval technique for LCP with passive fixation mechanism has not been previously described in details. Herein we report a newly recognized complication of an acute rise in pacing threshold very soon after implantation of an LCP without radiographic dislodgement...
October 28, 2017: Indian Pacing and Electrophysiology Journal
https://www.readbyqxmd.com/read/29102795/enhanced-antimicrobial-activity-of-naturally-derived-bioactive-molecule-chitosan-conjugated-silver-nanoparticle-against-dental-implant-pathogens
#7
Darshan Devang Divakar, Nahla Talal Jastaniyah, Hazem Ganem Altamimi, Yasser Obaidallah Alnakhli, Muzaheed, Abdulaziz Abdullah Alkheraif, Shaista Haleem
Various metal coated implants have been tested against dental pathogens which causes increased biofilm formation and lead to failure of dental implants. The possibility of using nanoparticle together with native biomolecules to enhance the activity of such bioactive compound is also in progress. In this study we tested the efficacy of Ag conjugated chitosan nanoparticles as a prospective coating material of titanium dental implants. Known bioactive molecule chitosan was extracted from A. flavus Af09 and conjugated with Ag nanoparticle...
November 1, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29096989/the-effect-of-manufacturing-techniques-on-custom-made-titanium-cranioplasty-plates-a-pilot-study
#8
Amy V Davey
OBJECTIVE: This study investigated the effect of varying techniques on the surface characteristics of pressed titanium cranioplasty plates, commonly manufactured in laboratory practice. The aim was to highlight the variety of techniques currently used, assess these methods of manufacture and produce manufacturing recommendations. METHODS: A questionnaire identified manufacturing methods commonly used by maxillofacial prosthetists. The plate surfaces were examined using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) spectrometry...
September 28, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/29084296/a-protocol-for-screw-retrievable-cement-retained-implant-supported-fixed-partial-dentures
#9
Abdulaziz AlHelal, Mathew T Kattadiyil, Bader AlBader, Jefferson L Clark
Longevity of implant-supported fixed partial dentures (ISFPDs) may be associated with multiple clinical complications, irrespective of whether retention is achieved via screws or cement. While use of screws ensures ease of prosthesis retrievability and elimination of the inherently risky cementation process, more mechanical strains are induced in this design. A combined screw-retrievable and cement-retained ISFPD is designed to achieve the best passive fit and strain reduction while allowing complete excess cement removal and maintaining ease of retrievability...
November 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29057348/navigation-accuracy-comparing-non-covered-frame-and-use-of-plastic-sterile-drapes-to-cover-the-reference-frame-in-3d-acquisition
#10
Donald S Corenman, Eric L Strauch, Grant J Dornan, Eric Otterstrom, Lisa Zalepa King
BACKGROUND: Advancements in surgical navigation technology coupled with 3-dimensional (3D) radiographic data have significantly enhanced the accuracy and efficiency of spinal fusion implant placement. Increased usage of such technology has led to rising concerns regarding maintenance of the sterile field, as makeshift drape systems are fraught with breaches thus presenting increased risk of surgical site infections (SSIs). A clinical need exists for a sterile draping solution with these techniques...
September 2017: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/29048694/effect-of-sleeved-ceramic-femoral-heads-on-titanium-ion-release
#11
Anthony Deny, Janie Barry, Jonathan R B Hutt, Martin Lavigne, Vincent Massé, Pascal-André Vendittoli
INTRODUCTION: Metal ion release from wear and corrosion at the femoral head-stem taper junction can evoke local adverse reactions to metal debris (ARMD). In a specific large-diameter head (LDH) total hip arthroplasty (THA) system, ceramic femoral heads of 44 to 48 mm are available with a titanium (Ti) adaptor sleeve, while heads of 36- to 40-mm come without sleeves. The hypothesis of this study is that the Ti adaptor sleeve with LDH ceramic-on-ceramic (CoC) bearings will not cause wear or corrosion at the taper junction and, thus, will not generate high whole blood Ti ion levels...
October 16, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29047595/ultrafast-all-optical-flip-flop-based-on-passive-micro-sagnac-waveguide-ring-with-photonic-crystal-fiber
#12
Ming Xu, Wan Yang, Tao Hong, TangZhen Kang, JianHua Ji, Ke Wang
Ultrafast all-optical flip-flop based on a passive micro Sagnac waveguide ring is studied through theoretical analysis and numerical simulation in this paper. The types of D, R-S, J-K, and T flip-flop are designed by controlling the cross-phase modulation effect of lights in this special microring. The high nonlinearity of the hollow-core photonic crystal fiber is implanted on a chip to shorten the length of the ring and reduce input power. By sensible management, the pulse width ratio of the input and the control signal, problems of pulse narrowing, and residual pedestal at the out port are solved...
June 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29022056/implant-strategy-affects-scaffold-stability-and-integrity-in-cartilage-treatment
#13
M Drobnic, Francesco Perdisa, E Kon, F Cefalì, M Marcacci, G Filardo
PURPOSE: To identify the most appropriate implantation strategy for a novel chondral scaffold in a model simulating the early post-operative phase, in order to optimize the implant procedure and reduce the risk of early failure. METHODS: Eight human cadaveric limbs were strapped to a continuous passive motion device and exposed to extension-flexion cycles (0°-90°). Chondral lesions (1.8 cm diameter) were prepared on condyles, patella and trochlea for the implant of a bi-layer collagen-hydroxyapatite scaffold...
October 11, 2017: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/28992962/the-long-and-short-term-variability-of-breathing-induced-tumor-motion-in-lung-and-liver-over-the-course-of-a-radiotherapy-treatment
#14
Jennifer Dhont, Jef Vandemeulebroucke, Manuela Burghelea, Kenneth Poels, Tom Depuydt, Robbe Van Den Begin, Cyril Jaudet, Christine Collen, Benedikt Engels, Truus Reynders, Marlies Boussaer, Thierry Gevaert, Mark De Ridder, Dirk Verellen
PURPOSE: To evaluate the short and long-term variability of breathing induced tumor motion. MATERIALS AND METHODS: 3D tumor motion of 19 lung and 18 liver lesions captured over the course of an SBRT treatment were evaluated and compared to the motion on 4D-CT. An implanted fiducial could be used for unambiguous motion information. Fast orthogonal fluoroscopy (FF) sequences, included in the treatment workflow, were used to evaluate motion during treatment. Several motion parameters were compared between different FF sequences from the same fraction to evaluate the intrafraction variability...
October 6, 2017: Radiotherapy and Oncology: Journal of the European Society for Therapeutic Radiology and Oncology
https://www.readbyqxmd.com/read/28975421/maxillary-zygomatic-hexagonal-implant-system-mzh-system-for-severe-resorption-a-new-technique
#15
Muñoz Ruben, Golaszewski Jose, Diaz Alvaro, Speranza Grace
INTRODUCTION: The biomechanical demands of the severely resorbed maxilla have prompted the search for alternative points of anchorage for zygomatic implants that allows stabilizing a prosthesis in young patients (30 years old or more) for restitution of function and form. The purpose of this study is to describe the protocol of zygomatic hexagonal implants in patients with severe maxillary bone resorption. MATERIALS AND METHODS: Ten patients with severe maxillary resorption were treated with hexagonal implants system, they were evaluated at the preoperative and the postoperative periods for a minimal of 24 months, and the evaluation was clinical and trough conventional radiographs and CT scans...
December 2017: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28972737/friction-stir-processing-of-stainless-steel-for-ascertaining-its-superlative-performance-in-bioimplant-applications
#16
G Perumal, A Ayyagari, A Chakrabarti, D Kannan, S Pati, H S Grewal, S Mukherjee, S Singh, H S Arora
Substrate-cell interactions for a bioimplant are driven by substrate's surface characteristics. In addition, the performance of an implant and resistance to degradation are primarily governed by its surface properties. A bioimplant typically degrades by wear and corrosion in the physiological environment, resulting in metallosis. Surface engineering strategies for limiting degradation of implants and enhancing their performance may reduce or eliminate the need for implant removal surgeries and the associated cost...
October 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28972426/an-investigation-of-a-novel-tendon-transfer-surgery-for-high-median-ulnar-nerve-palsy-in-a-chicken-model
#17
Geoffrey R Browning, Anthony H Le, Jennifer J Warnock, Ravi Balasubramanian
PURPOSE: The state-of-the-art tendon transfer surgery for high median-ulnar nerve palsy involves directly suturing four finger flexor tendons to one wrist extensor muscle. This couples finger flexion limiting the patient's ability to grasp objects. Therefore, we propose a new approach to attach a novel passive implant to the extensor digitorum longus tendon in order to create a differential mechanism in situ. The implant is expected to enable the fingers to adapt to an object's shape during grasping...
October 3, 2017: Journal of Investigative Surgery: the Official Journal of the Academy of Surgical Research
https://www.readbyqxmd.com/read/28965251/accuracy-of-multi-unit-implant-impression-traditional-techniques-versus-a-digital-procedure
#18
Maria Menini, Paolo Setti, Francesco Pera, Paolo Pera, Paolo Pesce
OBJECTIVES: The objective of this study was to evaluate the accuracy of different impression techniques on multiple implants. MATERIAL AND METHODS: A master cast simulating a jaw with four implants was used. Eight impression techniques were tested: open tray-polyether#1, open tray plus splint of impression copings with acrylic resin-polyether#1, closed tray-polyether#1, open tray-polyether#2, open tray-splint-polyether#2, closed tray-polyether#2, open tray-impression plaster, and digital impression (DI)...
September 30, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28944373/misfit-of-implant-prostheses-and-its-impact-on-clinical-outcomes-definition-assessment-and-a-systematic-review-of-the-literature
#19
Joannis Katsoulis, Takuro Takeichi, Ana Sol Gaviria, Lukas Peter, Konstantinos Katsoulis
BACKGROUND AND AIM: Compromised fit between the contact surfaces of screw-retained implant-supported fixed dentures (IFDs) is thought to create uncontrolled strains in the prosthetic components and peri-implant tissues, thus evoking biological and technical complications such as bone loss, screw loosening, component fractures and, at worst, loss of implants or prostheses. The aim of this systematic review was to evaluate the impact of marginal misfit on the clinical outcomes of IFDs, and to elucidate definition and assessment methods for passive fit...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28936684/kinematics-of-mobile-bearing-unicompartmental-knee-arthroplasty-compared-to-native-results-from-an-in-vitro-study
#20
Geert Peersman, Josh Slane, Philippe Vuylsteke, Susanne Fuchs-Winkelmann, Philipp Dworschak, Thomas Heyse, Lennart Scheys
INTRODUCTION: Fixed-bearing unicompartmental knee arthroplasty (UKA) closely replicates native knee kinematics. As few studies have assessed kinematics following mobile-bearing (MB) UKA, the current study aimed to investigate whether MB UKA preserves natural knee kinematics. MATERIALS AND METHODS: Seven fresh-frozen full-leg cadaver specimens were prepared and mounted in a kinematic rig that allowed all degrees of freedom at the knee. Three motion patterns, passive flexion-extension (0°-110° flexion), open-chain extension (5°-70° flexion) and squatting (30°-100° flexion), were performed pre- and post-implantation of a medial MB UKA and compared in terms of rotational and translational knee joint kinematics in the different anatomical planes, respectively...
September 21, 2017: Archives of Orthopaedic and Trauma Surgery
keyword
keyword
70785
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"