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Extendible Prostheses

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https://www.readbyqxmd.com/read/29759826/framework-design-and-pontics-of-fiber-reinforced-composite-fixed-dental-prostheses-an-overview
#1
REVIEW
Leila Perea-Lowery, Pekka K Vallittu
PURPOSE: Fiber-reinforced composite (FRC) fixed dental prostheses (FDPs) have shown good performance in clinical applications due to their good mechanical properties and minimally invasive approach. However, typical failure patterns of FRC FDPs are often localized at the pontic site. That reflects the structural considerations at the framework and pontic location that need to be examined when creating these kinds of prostheses. STUDY SELECTION: Peer-reviewed articles and other scientific literature were reviewed for providing up-to-date information on how pontics of FRC FDPs can be made...
May 11, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29755399/leg-prosthesis-with-somatosensory-feedback-reduces-phantom-limb-pain-and-increases-functionality
#2
Caroline Dietrich, Sandra Nehrdich, Sandra Seifert, Kathrin R Blume, Wolfgang H R Miltner, Gunther O Hofmann, Thomas Weiss
Phantom limb pain (PLP) develops in most patients with lower limb amputation. Changes in the peripheral and central nervous system (CNS) are hypothesized to contribute to PLP. Based on ideas to modify neural reorganization within the CNS, the aim of the study was to test, whether prostheses with somatosensory feedback might help to reduce PLP, and increase the functionality of movement with a prosthesis. We therefore equipped the prostheses of 14 lower leg amputees with a simple to use feedback system that provides electrocutaneous feedback to patients' thigh whenever the foot and toes of the prosthesis touch the ground...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29723319/prosthetic-tooth-replacement-in-a-german-population-over-the-course-of-11-years-results-of-the-study-of-health-in-pomerania
#3
Torsten Mundt, Christian Schwahn, Carsten Oliver Schmidt, Reiner Biffar, Stefanie Samietz
PURPOSE: To evaluate changes in distribution of teeth and in prosthodontic tooth replacement during an 11-year period in an adult population. MATERIALS AND METHODS: Information on prosthetic status was collected from 4,288 participants aged 20 to 81 years at baseline in the Study of Health in Pomerania (SHIP-0) and from 2,244 participants aged 30 to 92 years who reappeared in the 11-year follow-up (SHIP-2). The tooth distribution per arch was classified into one of the six following classes: class 0 (edentulous), class 1 (one to three remaining teeth), class 2 (extended tooth-bounded space or extreme shortened dental arch), class 3 (small anterior space), class 4 (small posterior space with one or more missing premolars), or class 5 (functional dentition)...
May 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29692718/human-s-capability-to-discriminate-spatial-forces-at-the-big-toe
#4
Annette Hagengruber, Hannes Höppner, Jörn Vogel
A key factor for reliable object manipulation is the tactile information provided by the skin of our hands. As this sensory information is so essential in our daily life it should also be provided during teleoperation of robotic devices or in the control of myoelectric prostheses. It is well-known that feeding back the tactile information to the user can lead to a more natural and intuitive control of robotic devices. However, in some applications it is difficult to use the hands as natural feedback channels since they may already be overloaded with other tasks or, e...
2018: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/29673708/fractographic-analyses-of-failed-one-piece-zirconia-implant-restorations
#5
Marit Øilo, Dwayne Arola
BACKGROUND: Promising results of initial clinical trials with yttria-stabilized zirconia have led to more extensive use of zirconia in dental implant superstructures. The applications have extended to abutments and complex individually designed crown-abutment one-piece structures. Little is known about their clinical success and the primary cause of failures. PURPOSE: The aim of this study was to identify the cause of fracture of retrieved implant-retained one-piece prostheses that failed during clinical use...
April 16, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29589498/the-use-of-a-non-invasive-extendable-prosthesis-at-the-time-of-revision-arthroplasty
#6
M M Gilg, C L Gaston, L Jeys, A Abudu, R M Tillman, J D Stevenson, R J Grimer, M C Parry
Aims The use of a noninvasive growing endoprosthesis in the management of primary bone tumours in children is well established. However, the efficacy of such a prosthesis in those requiring a revision procedure has yet to be established. The aim of this series was to present our results using extendable prostheses for the revision of previous endoprostheses. Patients and Methods All patients who had a noninvasive growing endoprosthesis inserted at the time of a revision procedure were identified from our database...
March 1, 2018: Bone & Joint Journal
https://www.readbyqxmd.com/read/29536682/-application-of-tri-lock-bone-preservation-stem-in-acetabular-protrusion-combined-with-shorten-defect-of-femoral-head-and-neck
#7
Jun Liu, Ping Zhen, Sheng-Hu Zhou, Qi Tian, Hui Chen, Wei Wang, Xiao-le He, Xu-Sheng Li
OBJECTIVE: To evaluate the manipulation technique and clinical outcome of Tri-Lock bone preservation stem for acetabular protrusion combined with shorten defect of femoral head and neck. METHODS: From January 2013 to December 2015, 10 patients(12 hips) with acetabular protrusion combined with shorten defect of femoral head and neck were treated with total hip arthroplasty(THA) including 5 males and 5 female with an average age of(51.6±3.0) years old ranging from 42...
February 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29529639/what-are-the-complications-of-allograft-reconstructions-for-sarcoma-resection-in-children-younger-than-10-years-at-long-term-followup
#8
Luis A Aponte-Tinao, Jose I Albergo, Miguel A Ayerza, D Luis Muscolo, Federico Milano Ing, German L Farfalli
BACKGROUND: Preservation of limb function after resection of malignant bone tumors in skeletally immature children is challenging. Resection of bone sarcomas and reconstruction with an allograft in patients younger than 10 years old is one reconstructive alternative. However, long-term studies analyzing late complications and limb length discrepancy at skeletal maturity are scarce; this information would be important, because growth potential is altered in these patients owing to the loss of one physis during tumor resection...
March 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29498576/3d-printing-and-intraoperative-neuronavigation-tailoring-for-skull-base-reconstruction-after-extended-endoscopic-endonasal-surgery-proof-of-concept
#9
Walid I Essayed, Prashin Unadkat, Ahmed Hosny, Sarah Frisken, Marcio S Rassi, Srinivasan Mukundan, James C Weaver, Ossama Al-Mefty, Alexandra J Golby, Ian F Dunn
OBJECTIVE Endoscopic endonasal approaches are increasingly performed for the surgical treatment of multiple skull base pathologies. Preventing postoperative CSF leaks remains a major challenge, particularly in extended approaches. In this study, the authors assessed the potential use of modern multimaterial 3D printing and neuronavigation to help model these extended defects and develop specifically tailored prostheses for reconstructive purposes. METHODS Extended endoscopic endonasal skull base approaches were performed on 3 human cadaveric heads...
March 2, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29483694/new-technologies-for-developing-second-generation-retinal-prostheses
#10
REVIEW
Fabio Benfenati, Guglielmo Lanzani
Inherited or age-dependent retinal dystrophies such as Retinitis pigmentosa (RP) and macular degeneration (MD) are among the most prevalent causes of blindness. Despite enormous efforts, no established pharmacological treatment to prevent or cure photoreceptor degeneration has been identified. Given the relative survival of the inner retina, attempts have been made to restore vision with optogenetics or with retinal neuroprostheses to allow light-dependent stimulation of the inner retinal network. While microelectrode and photovoltaic devices based on inorganic technologies have been proposed and in many cases implanted in RP patients, a new generation of prosthetics based on organic molecules, such as organic photoswitches and conjugated polymers, is demonstrating an unexpected potential for visual rescue and intimate interactions with functioning tissue...
March 2018: Lab Animal
https://www.readbyqxmd.com/read/29432117/closed-loop-continuous-hand-control-via-chronic-recording-of-regenerative-peripheral-nerve-interfaces
#11
Philip P Vu, Zachary T Irwin, Autumn J Bullard, Shoshana W Ambani, Ian C Sando, Melanie G Urbanchek, Paul S Cederna, Cynthia A Chestek
Loss of the upper limb imposes a devastating interruption to everyday life. Full restoration of natural arm control requires the ability to simultaneously control multiple degrees of freedom of the prosthetic arm and maintain that control over an extended period of time. Current clinically available myoelectric prostheses do not provide simultaneous control or consistency for transradial amputees. To address this issue, we have implemented a standard Kalman filter for continuous hand control using intramuscular electromyography (EMG) from both regenerative peripheral nerve interfaces (RPNI) and an intact muscle within non-human primates...
February 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29362635/prosthodontic-rehabilitation-of-patient-with-anterior-hyper-function-syndrome
#12
Vesna Korunoska-Stevkovska, Ljuben Guguvcevski, Zaklina Menceva, Nikola Gigovski, Aneta Mijoska, Julijana Nikolovska, Emilija Bajraktarova-Valjakova
BACKGROUND: The success of prosthetic rehabilitation in patients with removable dentures depends on the achievement of the aesthetics, phonetics and most of all, proper use in the mastication process. All the patients that receive removable prostheses need a feeding education program. They must cut the food into smaller pieces, extend the length of time necessary for chewing and place the food upon both the right and left sides of the mouth at once. Bilaterally chewing with dentures will contribute to increased efficiency and denture stability during mastication...
December 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/29360049/analysis-of-the-elastic-bending-characteristics-of-cementless-short-hip-stems-considering-the-valgus-alignment-of-the-prosthetic-stem
#13
Alexander Jahnke, Carlos A Fonseca Ulloa, Jörn Bengt Seeger, Markus Rickert, Gerhard Walter Jahnke, Gafar Adam Ahmed, Bernd Alexander Ishaque
BACKGROUND: The resultant hip force causes a varus torque which must be compensated by a shear force couple depending on the stem alignment of the prosthesis. Since the prosthesis is substantially less flexible than the bone, the interior of the femur is stiffened over the entire prosthesis length. The present study thus aims at analyzing short-stem prostheses for its elastic bending characteristics, considering inappropriate valgus alignment of the prosthetic stem. METHODS: Five short stem prostheses were implanted each in synthetic femora in a standardized manner - in neutral and valgus stem alignments...
February 2018: Clinical Biomechanics
https://www.readbyqxmd.com/read/29276305/stable-robust-hybrid-zero-dynamics-control-of-powered-lower-limb-prostheses
#14
Anne E Martin, Robert D Gregg
To improve the quality of life for lower-limb amputees, powered prostheses are being developed. Advanced control schemes from the field of bipedal robots, such as hybrid zero dynamics (HZD), may provide great performance. HZD-based control specifies the motion of the actuated joints using output functions to be zeroed, and the required torques are calculated using input-output linearization. For one-step periodic gaits, there is an analytic metric of stability. To apply HZD-based control on a powered prosthesis, several modifications must be made...
August 2017: IEEE Transactions on Automatic Control
https://www.readbyqxmd.com/read/29198812/the-effect-of-a-radial-neck-notch-on-press-fit-stem-stability-a-biomechanical-study-on-7-cadavers
#15
Dave R Shukla, Dipit C Sahu, James S Fitzsimmons, Kai-Nan An, Shawn W O'Driscoll
BACKGROUND: Minimal micromotion is necessary for osteointegration of cementless radial head prostheses. When radial head fractures extend longitudinally, where the neck cut for prosthetic replacement should be made is uncertain. We hypothesized that complete resection of the notched portion of a radial neck confers no advantage in initial stability compared with not resecting the defect and inserting the implant into a notched radial neck. MATERIALS AND METHODS: The radii of 7 cadavers underwent radial head resection and implantation with a 25-mm-long press-fit radial head stem...
March 2018: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/28940708/clinical-and-patient-reported-outcomes-of-zirconia-based-implant-fixed-dental-prostheses-results-of-a-prospective-case-series-5-years-after-implant-placement
#16
Benedikt Christopher Spies, Siegbert Witkowski, Kirstin Vach, Ralf-Joachim Kohal
OBJECTIVE: To evaluate the clinical and patient-reported outcome of all-ceramic zirconia implant supported fixed dental prostheses (FDPs) 5 years after implant installation. MATERIALS AND METHODS: Thirteen patients were treated with two terminally placed one-piece zirconia implants for a three-unit FDP each. The FDPs consisted of a CAD/CAM-fabricated zirconia framework over-pressed with a fluor-apatite veneering ceramic and were adhesively cemented. Survival and success were assessed by applying modified US Public Health Service (USPHS) criteria and preparation of Kaplan-Meier (KM) plots...
January 2018: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28832013/model-and-experiments-to-optimize-co-adaptation-in-a-simplified-myoelectric-control-system
#17
M Couraud, D Cattaert, F Paclet, P Y Oudeyer, A de Rugy
OBJECTIVE: To compensate for a limb lost in an amputation, myoelectric prostheses use surface electromyography (EMG) from the remaining muscles to control the prosthesis. Despite considerable progress, myoelectric controls remain markedly different from the way we normally control movements, and require intense user adaptation. To overcome this, our goal is to explore concurrent machine co-adaptation techniques that are developed in the field of brain-machine interface, and that are beginning to be used in myoelectric controls...
April 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28814025/learning-from-demonstration-teaching-a-myoelectric-prosthesis-with-an-intact-limb-via-reinforcement-learning
#18
Gautham Vasan, Patrick M Pilarski
Prosthetic arms should restore and extend the capabilities of someone with an amputation. They should move naturally and be able to perform elegant, coordinated movements that approximate those of a biological arm. Despite these objectives, the control of modern-day prostheses is often nonintuitive and taxing. Existing devices and control approaches do not yet give users the ability to effect highly synergistic movements during their daily-life control of a prosthetic device. As a step towards improving the control of prosthetic arms and hands, we introduce an intuitive approach to training a prosthetic control system that helps a user achieve hard-to-engineer control behaviours...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813980/human-mimetic-forearm-mechanism-towards-bionic-arm
#19
Minsang Seo, Hogyun Kim, Youngjin Choi
The paper presents a mechanical forearm mechanism to extend the pronation and supination (P/S) movement of the trans-radial amputee when he/she is able to conduct the P/S motion partially with his/her remaining forearm. The P/S motions of the existing prostheses and robotic arms developed till now are completely different from those of the human. When we are to develop the robotic prostheses for the amputees, two important issues should be considered such as cosmetic issue to look like normal arm and motion harmony issue between robotic prosthesis and the amputated living arm...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28741593/electro-cutaneous-stimulation-on-the-palm-elicits-referred-sensations-on-intact-but-not-on-amputated-digits
#20
M D' Alonzo, L F Engels, M Controzzi, C Cipriani
OBJECTIVE: Grasping and manipulation control critically depends on tactile feedback. Without this feedback, the ability for fine control of a prosthesis is limited in upper limb amputees. Early studies have shown that non-invasive electro-cutaneous stimulation (ES) can induce referred sensations that are spread to a wider and/or more distant area, with respect to the electrodes. Building on this, we sought to exploit this effect to provide somatotopically matched sensory feedback to people with partial hand (digital) amputations...
February 2018: Journal of Neural Engineering
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