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Extendible Prostheses

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https://www.readbyqxmd.com/read/28708920/complications-and-clinical-considerations-of-the-implant-retained-zirconia-complete-arch-prosthesis-with-various-opposing-dentitions
#1
Jorge Gonzalez, Robert G Triplett
PURPOSE: To evaluate the performance of the implant-retained zirconia complete-arch prosthesis with various opposing dentitions. MATERIALS AND METHODS: The 40 patients included in this retrospective case series study were treated with one or two implant-retained zirconia complete-arch prostheses (ZIRCAP) using the Zirkonzahn protocol. Prettau zirconia frames were created with strategic cutbacks in the structure to extend zirconia incisal coverage of the esthetic anterior sextants and complete monolithic zirconia in the molar areas; subsequent layers of porcelain were applied to nonfunctional and esthetic areas...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28628994/tio2-surfaces-support-neuron-growth-during-electric-field-stimulation
#2
M Canillas, B Moreno, E Chinarro, A M Rajnicek
TiO2 is proposed here for the first time as a substrate for neural prostheses that involve electrical stimulation. Several characteristics make TiO2 an attractive material: Its electrochemical behaviour as an insulator prevents surface changes during stimulation. Hydration creates -OH groups at the surface, which aid cell adhesion by interaction with inorganic ions and macromolecules in cell membranes. Its ability to neutralize reactive oxygen and nitrogen species that trigger inflammatory processes confers biocompatibility properties in dark conditions...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28602486/supramacroparticulate-pe-in-6-different-joint-endoprostheses-localisations-an-indicator-for-pe-damage
#3
Simon Krenn, Marc Thomsen, Sylvia Usbeck, Leslie F Scheuber, Friedrich Boettner, Manfred Georg Krukemeyer, Monika Huber, Jan Philippe Kretzer, Thorsten Gehrke, Veit Krenn
In the histopathological particle algorithm polyethylene (PE) particles with maximum lengths of more than 100μm - called PE supramacroparticles - are identified exclusively for knee joint and hip prostheses. However, a definitive characterisation, detection in all joint localisations and a causal clarification of the pathogenesis are lacking. In this study a total of 175 SLIM (synovial-like interface membrane) cases with PE supramacroparticles of knee joint prostheses (n=89), hip joint prostheses (n=44), ankle joint prostheses (n=36) and prostheses in three localisations of the upper extremities (n=6) were systematically investigated...
March 31, 2017: Pathology, Research and Practice
https://www.readbyqxmd.com/read/28513897/quality-and-survival-of-direct-light-activated-composite-resin-restorations-in-posterior-teeth-a-5-to-20-year-retrospective-longitudinal-study
#4
REVIEW
Ernesto Borgia, Rosario Baron, Jose Luis Borgia
PURPOSE: To analyze the clinical success of direct light-activated composite resin restorations in posterior teeth. The quality of the margins and occlusal surfaces were evaluated, as well as their survival, according to their extensions and locations. The clinical performance of posterior composite resin restorations with different compositions were compared. All restorations were performed by the first author in his private practice, in a 5- to 20-year period. MATERIALS AND METHODS: Several types of composite resins, provided by different manufacturers, were placed in posterior teeth, after isolation with rubber dams...
May 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28403102/mandibular-regeneration-after-immediate-load-dental-implant-in-a-periodontitis-patient-a-clinical-and-ultrastructural-case-report
#5
Maurizio Catinari, Manuel Scimeca, Massimo Amorosino, Mario Marini, Elena Bonanno, Virginia Tancredi
RATIONALE: In this case study, we characterized from radiographic, morphological and elemental point of view the mandibular reconstruction that occur in patients affects by periodontitis after application of endosseous titanium implants. In particular, we verified that the bone load applied by titanium implant was able to induce the mandibular osteogenic reconstruction. PATIENT CONCERN: A 57-year-old female active smoker with no contraindications for dental implants and 3 unstable dental prostheses, underwent open surgery for the application of endosseous titanium implants (BANP IMPLANT S...
April 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28390886/epidemiology-and-antibiotic-resistance-of-late-prosthetic-knee-and-hip-infections
#6
Lorenzo Drago, Elena De Vecchi, Monica Bortolin, Luigi Zagra, Carlo L Romanò, Laura Cappelletti
BACKGROUND: Prosthetic joint infections (PJI) are still a major complication of hip and knee arthroplasties. Identification of the causative pathogens and knowledge of their antibiotic susceptibilities are essential for the management of these infections. The main purpose of the study was to identify and compare the causative bacteria of prosthetic knee and hip joint infections in a reference Italian orthopedic center and to characterize antibiotic resistance profiles of bacteria involved...
March 15, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28387657/the-importance-of-orthoses-on-activities-of-daily-living-in-patients-with-unilateral-lower-limb-amputations
#7
Sule Sahin Onat, Sibel Ünsal-Delialioğlu, Sumru Özel
BACKGROUND: The role of the selected prothesis on activities of daily living (ADL). OBJECTIVE: To evaluate the impact of prothesis on ADL in patients with lower-limb amputations. METHODS: The data of 500 patients with unilateral lower limb amputation were recorded. The activity level was defined based on the Medicare Functional Classification Level. Old and new prescribed prosthesis were recorded. Nottingham Extended Activities of daily living activities Daily Living Scale was used to evaluate ADL...
March 31, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28376233/a-call-for-fertility-preservation-coverage-for-breast-cancer-patients-the-cost-of-consistency
#8
Jessica R Walter, Shuai Xu, Teresa K Woodruff
In 1998, the passage of the Women's Health and Cancer Rights Act required insurance health plans nationwide covering breast cancer treatments to also reimburse for subsequent breast reconstructive surgery and prostheses. In response to low utilization of breast reconstructive services, particularly among racial minorities, plastic surgery interest groups successfully advocated for the passage of the Breast Cancer Patient Education Act, which provides a timely opportunity to reconsider patient accessibility to other equally important quality of life issues for cancer survivors...
May 1, 2017: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/28371783/monocular-vision-and-imu-based-system-for-prosthesis-pose-estimation-during-total-hip-replacement-surgery
#9
Shaojie Su, Yixin Zhou, Zhihua Wang, Hong Chen
The average age of population increases worldwide, so does the number of total hip replacement surgeries. Total hip replacement, however, often involves a risk of dislocation and prosthetic impingement. To minimize the risk after surgery, we propose an instrumented hip prosthesis that estimates the relative pose between prostheses intraoperatively and ensures the placement of prostheses within a safe zone. We create a model of the hip prosthesis as a ball and socket joint, which has four degrees of freedom (DOFs), including 3-DOF rotation and 1-DOF translation...
June 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28269495/split-belt-adaptation-and-gait-symmetry-in-transtibial-amputees-walking-with-a-hybrid-emg-controlled-ankle-foot-prosthesis
#10
Oliver A Kannape, Hugh M Herr
Our ability to automatically adapt our walking pattern to the demands of our environment is central to maintaining a steady gait. Accordingly, a large effort is being made to extend and integrate this adaptability to lower-limb prostheses. To date, the main focus of this research has been on short term adaptation, such as in response to a terrain transition or a sudden change in the environment. However, long term adaptation and underlying sensorimotor learning processes are critical to optimizing walking patterns and predictively changing our gait when faced with continued perturbations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268266/simple-emg-driven-musculoskeletal-model-enables-consistent-control-performance-during-path-tracing-tasks
#11
Dustin Crouch, He Huang
Consistent, robust performance is critical for the utility and user-acceptance of neurally-controlled powered upper limb prostheses. We preliminarily evaluated the performance consistency of an electromyography (EMG)-driven controller based on a two degree-of-freedom musculoskeletal hand model, whose simplified structure is more practical for real-time prosthesis control than existing, complex models. Parameters of four virtual muscles were computed by numerical optimization from an able-bodied subject's kinematic and EMG data collected during wrist and metacarpophalangeal (MCP) flexion/extension movements...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28261012/evaluation-of-effects-of-electrical-stimulation-in-the-retina-with-optical-coherence-tomography
#12
A Gonzalez-Calle, J D Weiland
Retinal prostheses provide the capability to blind patients to detect motion and locate large objects. To avoid activating axons of passage, which can create streak-like perceptions, long pulse stimulation can be used to bypass axons and achieve focal retinal activation. Safety is a concern because long pulses require more charge than short pulses to elicit a response from neural tissue. Future implants will require smaller electrodes to improve resolution, but increased charge density may result, which is another safety concern...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227922/evaluation-of-effects-of-electrical-stimulation-in-the-retina-with-optical-coherence-tomography
#13
A Gonzalez-Calle, J D Weiland, A Gonzalez-Calle, J D Weiland, A Gonzalez-Calle, J D Weiland
Retinal prostheses provide the capability to blind patients to detect motion and locate large objects. To avoid activating axons of passage, which can create streak-like perceptions, long pulse stimulation can be used to bypass axons and achieve focal retinal activation. Safety is a concern because long pulses require more charge than short pulses to elicit a response from neural tissue. Future implants will require smaller electrodes to improve resolution, but increased charge density may result, which is another safety concern...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227747/split-belt-adaptation-and-gait-symmetry-in-transtibial-amputees-walking-with-a-hybrid-emg-controlled-ankle-foot-prosthesis
#14
Oliver A Kannape, Hugh M Herr, Oliver A Kannape, Hugh M Herr, Oliver A Kannape, Hugh M Herr
Our ability to automatically adapt our walking pattern to the demands of our environment is central to maintaining a steady gait. Accordingly, a large effort is being made to extend and integrate this adaptability to lower-limb prostheses. To date, the main focus of this research has been on short term adaptation, such as in response to a terrain transition or a sudden change in the environment. However, long term adaptation and underlying sensorimotor learning processes are critical to optimizing walking patterns and predictively changing our gait when faced with continued perturbations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226423/simple-emg-driven-musculoskeletal-model-enables-consistent-control-performance-during-path-tracing-tasks
#15
Dustin Crouch, He Huang, Dustin Crouch, He Huang, Dustin Crouch, He Huang
Consistent, robust performance is critical for the utility and user-acceptance of neurally-controlled powered upper limb prostheses. We preliminarily evaluated the performance consistency of an electromyography (EMG)-driven controller based on a two degree-of-freedom musculoskeletal hand model, whose simplified structure is more practical for real-time prosthesis control than existing, complex models. Parameters of four virtual muscles were computed by numerical optimization from an able-bodied subject's kinematic and EMG data collected during wrist and metacarpophalangeal (MCP) flexion/extension movements...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223914/decoding-lower-limb-muscle-activity-and-kinematics-from-cortical-neural-spike-trains-during-monkey-performing-stand-and-squat-movements
#16
Xuan Ma, Chaolin Ma, Jian Huang, Peng Zhang, Jiang Xu, Jiping He
Extensive literatures have shown approaches for decoding upper limb kinematics or muscle activity using multichannel cortical spike recordings toward brain machine interface (BMI) applications. However, similar topics regarding lower limb remain relatively scarce. We previously reported a system for training monkeys to perform visually guided stand and squat tasks. The current study, as a follow-up extension, investigates whether lower limb kinematics and muscle activity characterized by electromyography (EMG) signals during monkey performing stand/squat movements can be accurately decoded from neural spike trains in primary motor cortex (M1)...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28186679/directed-differentiation-of-human-embryonic-stem-cells-toward-placode-derived-spiral-ganglion-like-sensory-neurons
#17
Akihiro J Matsuoka, Zachery D Morrissey, Chaoying Zhang, Kazuaki Homma, Abdelhak Belmadani, Charles A Miller, Duncan M Chadly, Shun Kobayashi, Alexandra N Edelbrock, Miho Tanaka-Matakatsu, Donna S Whitlon, Ljuba Lyass, Tammy L McGuire, Samuel I Stupp, John A Kessler
The ability to generate spiral ganglion neurons (SGNs) from stem cells is a necessary prerequisite for development of cell-replacement therapies for sensorineural hearing loss. We present a protocol that directs human embryonic stem cells (hESCs) toward a purified population of otic neuronal progenitors (ONPs) and SGN-like cells. Between 82% and 95% of these cells express SGN molecular markers, they preferentially extend neurites to the cochlear nucleus rather than nonauditory nuclei, and they generate action potentials...
March 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28160269/infections-in-cancer-patients-with-solid-tumors-a-review
#18
REVIEW
Kenneth V I Rolston
Solid tumors are much more common than hematologic malignancies. Although severe and prolonged neutropenia is uncommon, several factors increase the risk of infection in patients with solid tumors, and the presence of multiple risk factors in the same patient is not uncommon. These include obstruction (most often caused by progression of the tumor), disruption of natural anatomic barriers such as the skin and mucosal surfaces, and treatment-related factors such as chemotherapy, radiation, diagnostic and/or therapeutic surgical procedures, and the increasing use of medical devices such as various catheters, stents, and prostheses...
March 2017: Infectious Diseases and Therapy
https://www.readbyqxmd.com/read/28159347/prevention-of-periimplant-skin-inflammation-using-an-acrylic-resin-housing-with-a-tunnel-design-for-an-implant-retained-auricular-prosthesis
#19
Hai Hoang Phan, Natdhanai Chotprasert, Prana Shakya, M L Theerathavaj Srithavaj
Implant-retained auricular prostheses offer better retention than conventional adhesive retentive methods. Periimplant skin inflammation, which results from improper substructure design, poor hygiene, skin thickness, and the hot and moist environment around abutments, however, is a common complication of craniofacial implants. This article describes a technique for fabricating an acrylic resin housing design with an extended arm to improve ventilation around implants and to reduce the risk of the silicone prosthesis tearing away from the acrylic resin housing...
January 31, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28112854/a-current-perspective-on-screw-retained-single-implant-restorations-a-review-of-pertinent-literature
#20
REVIEW
George Priest
OBJECTIVE: There is a trend toward increased use of screw-retained single-implant restorations. A comprehensive literature review was undertaken to examine the data related to screw- and cement-retention and to objectively evaluate the innovations in implant dentistry that have led to this resurgence. OVERVIEW: When comparing the two options, survival and complication rates are similar, bone and soft-tissue levels are comparable, and zirconia offers esthetic advantages for both selections...
January 23, 2017: Journal of Esthetic and Restorative Dentistry
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