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https://www.readbyqxmd.com/read/28814013/a-third-arm-design-of-a-bypass-prosthesis-enabling-incorporation
#1
Adam W Wilson, Daniel H Blustein, Jon W Sensinger
A variety of factors affect the performance of a person using a myoelectric prosthesis, including increased control noise, reduced sensory feedback, and muscle fatigue. Many studies use able-bodied subjects to control a myoelectric prosthesis using a bypass socket in order to make comparisons to movements made with intact limbs. Depending on the goals of the study, this approach can also allow for greater subject numbers and more statistical power in the analysis of the results. As we develop assessment tools and techniques to evaluate how peripheral nerve interfaces impact prosthesis incorporation, involving normally limbed subjects in the studies becomes challenging...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28814007/embroidered-archimedean-spiral-electrodes-for-contactless-prosthetic-control
#2
Andrew Mangezi, Andre Rosendo, Matthew Howard, Riaan Stopforth
With continuous advancements on active prosthetics the detection of the user's intention becomes the new technological bottleneck. While electromyography (EMG) is widely used to detect individual muscular contributions, sweat and relative sensor movements degrade the quality of the signal over time. In this paper, we bypass the problems created with the skin contact analyzing the muscular activation with Archimedean Spiral (AS) electrodes. We compare traditional EMG electrodes with AS electrodes, stacked up in textile embroidered layers to improve their functionality, and eventually adding a layer of cloth/silicon between the electrodes and the human skin to ascertain the feasibility of the method...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813997/dynamic-elasticity-measurement-for-prosthetic-socket-design
#3
Yujin Kim, Junghoon Kim, Hyeryon Son, Youngjin Choi
The paper proposes a novel apparatus to measure the dynamic elasticity of human limb in order to help the design and fabrication of the personalized prosthetic socket. To take measurements of the dynamic elasticity, the desired force generated as an exponential chirp signal in which the frequency increases and amplitude is maintained according to time progress is applied to human limb and then the skin deformation is recorded, ultimately, to obtain the frequency response of its elasticity. It is referred to as a Dynamic Elasticity Measurement Apparatus (DEMA) in the paper...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813988/capturing-prosthetic-socket-fitment-preliminary-results-using-an-ultrasound-based-device
#4
Andrew K LaPre, Vinh Q Nguyen, Ulvi Baspinar, Michael White, Frank C Sup
The acceptance of advanced prosthetic systems by users requires overcoming unique challenges of fitting prostheses to unique user anatomies to achieve systematic performance across a user base. Variations among individuals introduce complexities in fitting the sockets. Due to the difficulty of measuring socket interface characteristics, there is a lack of quantifiable diagnostic fitment information available. As a result, the process of fitting sockets is currently a laborintensive, manual approach, and can often result in sockets that are uncomfortable, unstable, or impede full range of motion...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28813975/a-lightweight-robotic-ankle-prosthesis-with-non-backdrivable-cam-based-transmission
#5
Tommaso Lenzi, Marco Cempini, Jeremy Newkirk, Levi J Hargrove, Todd A Kuiken
Below-knee level amputation significantly impacts the ability of an individual to ambulate. Transtibial amputees are typically prescribed energetically passive ankle-foot prostheses that behave as a spring or controlled damper, and therefore cannot fully replace the function of the missing limb. More recently, fully-powered devices have been proposed to more closely match the power generation ability of intact limbs. However, these fully-powered devices are significantly heavier than passive devices, thus increasing the stress on the socket-residual limb interface...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28812933/use-of-bilayer-matrix-wound-dressing-in-the-exenterated-socket
#6
Leon Rafailov, Roger E Turbin, Paul D Langer
To describe the novel use of a bilayer dermal substitute to reconstruct exenterated orbits. A retrospective chart review was performed in the practices of two surgeons (RET and PDL) of all patients who had undergone orbital exenteration between April 2014 and June 2016 and whose subsequent reconstruction included lining the socket with Integra bilayer. Patient demographics, pathologic diagnoses, surgical and post-operative complications, graft integrity, and patient acceptance were recorded. The charts of 7 patients (4 men and 3 women, ages 60-87 years) were reviewed...
August 16, 2017: Orbit
https://www.readbyqxmd.com/read/28812919/comparison-of-primary-and-secondary-enucleation-for-uveal-melanoma
#7
Chau M Pham, Philip L Custer, Steven M Couch
We investigated operative course and post-operative findings of patients undergoing primary enucleation for uveal melanoma versus those requiring secondary enucleation after brachytherapy. A retrospective chart review was performed with IRB approval on patients receiving treatment for uveal melanoma. Patients with enucleation as initial treatment and patients enucleated after plaque brachytherapy were analyzed for demographic data, operative course, and post-enucleation outcome. Further cause analysis for secondary enucleations was investigated...
August 16, 2017: Orbit
https://www.readbyqxmd.com/read/28812412/an-investigation-into-discharge-visual-perception-and-appearance-concerns-of-prosthetic-eye-wearers
#8
Nicola S Pine, Ian de Terte, Keith R Pine
We investigate prosthetic eye wearers' initial and current concerns about mucoid discharge, visual perception, and appearance, and the reasons for their concerns. A retrospective, cross-sectional study of private practice patients was designed. Participants were 217 experienced prosthetic eye wearers, aged at least 16 years. An anonymous questionnaire was e-mailed or mailed to participants. Descriptive and inferential statistics were used to investigate differences or correlations between variables. Content analysis was used to analyze participants' open responses...
August 16, 2017: Orbit
https://www.readbyqxmd.com/read/28803140/a-competent-catalytic-active-site-is-necessary-for-substrate-induced-dimer-assembly-in-triosephosphate-isomerase
#9
Pedro Jimenez-Sandoval, Jose Luis Vique-Sanchez, Marisol López Hidalgo, Gilberto Velazquez-Juarez, Corina Diaz-Quezada, Luis Fernando Arroyo-Navarro, Gabriela Montero Moran, Juliana Fattori, A Jessica Diaz-Salazar, Enrique Rudiño-Pinera, Rogerio Sotelo-Mundo, Ana Carolina Migliorini Figueira, Samuel Lara-Gonzalez, Claudia G Benítez-Cardoza, Luis G Brieba
The protozoan parasite Trichomonas vaginalis contains two nearly identical triosephosphate isomerases (TvTIMs) that dissociate into stable monomers and dimerize upon substrate binding. Herein, we compare the role of the "ball and socket" and loop 3 interactions in substrate assisted dimer assembly in both TvTIMs. We found that point mutants at the "ball" are only 39 and 29-fold less catalytically active than their corresponding wild-type counterparts, whereas loop 3 deletions are 1502 and 9400-fold less active...
August 9, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28802762/clinical-application-of-autogenous-partially-demineralized-dentin-matrix-prepared-immediately-after-extraction-for-alveolar-bone-regeneration-in-implant-dentistry-a-pilot-study
#10
T Minamizato, T Koga, Takashi I, Y Nakatani, M Umebayashi, Y Sumita, T Ikeda, I Asahina
The aim of this study was to examine the efficacy and safety of autogenous partially demineralized dentin matrix (APDDM) prepared onsite, for clinical application in bone regeneration procedures related to implant dentistry, including socket preservation, alveolar ridge augmentation, and maxillary sinus floor augmentation. In this study, 16 patients underwent dental implant placement using APDDM transplantation. There were no systemic or local complications (including surgical site infection) in any of the cases, and oral rehabilitation using dental implants was successful in all cases for at least 2 years after attachment of the suprastructure...
August 9, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28795622/animal-models-for-periodontal-tissue-engineering-a-knowledge-generating-process
#11
Karim Mohamed Fawzy El-Sayed, Christof Doerfer
The human periodontium is a uniquely complex vital structure, supporting and anchoring the teeth in their alveolar sockets, playing thereby a decisive role in tooth homeostasis and function. Chronic periodontitis is a highly prevalent immune-inflammatory disease of the periodontium, affecting 15% of adult individuals and is characterized by progressive destruction of the periodontal tooth-investing tissues, culminating in their irreversible damage. Current periodontal evidence-based treatment strategies achieve periodontal healing via repair processes, mostly combating the inflammatory component of the disease, to halt or reduce prospective periodontal tissue loss...
August 10, 2017: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/28781844/third-molar-transplantation-combined-with-an-osteotome-sinus-lift-two-case-reports
#12
Katsuki Yamamoto, Yoshinaga Osamu, Kae Kakura, Kazuko Yamamoto, Hirofumi Kido
We report here on our application of the socket lift technique to create a transplant socket for the transplanted maxillary molar. These outcomes suggest that this technique is likely to be effective for tooth transplantation when the maxillary sinus bottom is close to the alveolar crest.
August 2017: Clinical Case Reports
https://www.readbyqxmd.com/read/28781070/immediate-implant-placement-and-complete-mouth-rehabilitation-with-cad-cam-titanium-frameworks-and-cemented-crowns-for-a-patient-with-severe-periodontal-disease-a-clinical-report
#13
Pei Wang, Chunbo Tang, Yi Tang, Yunong Wu
The technique of immediate implantation has been widely used to reduce treatment time and bone loss after extraction. However, immediate implant placement in infected extraction sockets is generally contraindicated. This clinical report describes a treatment protocol for immediate implantation after the extraction of teeth with generalized chronic periodontitis. The technique used for the oral rehabilitation used computer-assisted design and computer-assisted manufacturing (CAD-CAM) titanium frameworks and cemented zirconia crowns...
August 4, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28781017/differences-in-femoral-head-penetration-between-highly-cross-linked-polyethylene-cemented-sockets-and-uncemented-liners
#14
Daigo Morita, Taisuke Seki, Yoshitoshi Higuchi, Yasuhiko Takegami, Naoki Ishiguro
BACKGROUND: This study aimed at investigating differences in femoral head penetration between highly cross-linked polyethylene (HXLPE) cemented sockets and uncemented liners during 5 years postoperatively. METHODS: Ninety-six patients (106 hips) with a mean age of 64.4 (range, 35-83) years underwent total hip arthroplasty using a HXLPE cemented socket or liner and were respectively divided into cemented (35 patients [37 hips]) and uncemented (61 patients [69 hips]) groups...
July 21, 2017: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28780249/dermal-fat-graft-for-anophthalmic-socket-in-children-enucleated-for-retinoblastoma
#15
V Bosch-Canto, C Cruz, J C Ordaz-Favila
Retinoblastoma is the most frequent intraocular tumour in childhood. The definitive treatment is enucleation. The management of the anophthalmic socket consists in the use of a plastic implant. The problem is that they are expensive and they usually extrude. The use of dermal-fat grafts minimises the hemi-facial hypoplasia. They usually grow with the face, and help to expand the orbital bones, thus avoiding the psychological and physical consequences. OBJECTIVE: To determine if there is hemi-facial hypoplasia, using MRI images after the use of a dermal-fat implant in patients enucleated for RB...
August 2, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28774523/wet-laboratory-training-using-porcine-eyes-with-eyelids
#16
Hiroyuki Nakashizuka, Yu Wakatsuki, Yumiko Machida, Yuko Okubo, Ari Shinojima, Takayuki Hattori, Hiroyuki Shimada, Mitsuko Yuzawa
OBJECTIVE: This study aimed to evaluate the usefulness of a new wet laboratory (wet lab) system using porcine eyes with eyelids. DESIGN: Teaching device trial. PARTICIPANTS: Porcine eyes with orbital tissues and eyelids. METHODS: Twenty porcine eyes with orbital tissues and eyelids were enucleated from pigs butchered at age 6 months. These eyes were positioned in the eye sockets of a model head and stabilized with a pin...
August 2017: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/28773112/corrosion-and-tribology-of-materials-used-in-a-novel-reverse-hip-replacement
#17
Linda Braddon, Zafer Termanini, Steven MacDonald, Jay Parvizi, Jay Lieberman, Victor Frankel, Joseph Zuckerman
Total hip arthroplasty has been utilized for the past 50 years as an effective treatment for degenerative, inflammatory and traumatic disorders of the hip. The design of these implants has generally followed the anatomy of the hip as a ball and socket joint with the femoral head representing the ball and the acetabulum representing the socket. We describe a novel hip arthroplasty design in which the "ball" is located on the acetabular side and the "socket" is located on the femoral side. The results of extensive biomechanical testing are described and document wear and corrosion characteristics that are at least equivalent to standard designs...
July 5, 2017: Materials
https://www.readbyqxmd.com/read/28770164/use-of-elevator-instruments-when-luxating-and-extracting-teeth-in-dentistry-clinical-techniques
#18
John Mamoun
In dentistry, elevator instruments are used to luxate teeth, and this technique imparts forces to tooth particles that sever the periodontal ligament around tooth roots inside the socket and expand alveolar bone around tooth particles. These effects can result in extraction of the tooth particles or facilitate systematic forceps extraction of the tooth particles. This article presents basic oral surgery techniques for applying elevators to luxate teeth. Determination of the optimal luxation technique requires understanding of the functions of the straight elevator and the Cryer elevator, the concept of purchase points, how the design elements of elevator working ends and tips influence the functionality of an elevator, application of forces to tooth particles, sectioning teeth at furcations, and bone removal to facilitate luxation...
June 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/28770156/platelet-rich-fibrin-in-the-management-of-established-dry-socket
#19
Srinivas Chakravarthi
OBJECTIVES: Dry socket may occur secondary to the removal of any tooth. However, most dry socket cases develop in the third molar region. Dry socket is multifactorial in nature and has been treated using various modalities with varying success rates. This study assessed the efficacy of platelet rich fibrin (PRF) in established dry socket. MATERIALS AND METHODS: Ten patients of either sex aged from 41 to 64 years with established dry socket according to established criteria were treated using PRF...
June 2017: Journal of the Korean Association of Oral and Maxillofacial Surgeons
https://www.readbyqxmd.com/read/28769626/new-record-for-the-genus-platymessa-mello-leit%C3%A3-o-1941-in-colombia-with-the-description-of-a-new-species-opiliones-cosmetidae
#20
Conchita A Pinzón-M, Victor R Townsend, Jr, Neis Martínez-H
The genus Platymessa Mello-Leitão, 1941 is represented by two species in the Andes of Colombia: P. h-inscriptum Mello-Leitão, 1941 and P. ectroxantha Mello-Leitão, 1941. Platymessa victoriae Pinzón-M. & Townsend, sp. n. is described on the basis of somatic morphological characters and the structure of the penis. The placement of this new species in the genus Platymessa is based upon multiple characters including the outline of dorsal scutum, the presence of a blunt spine on coxa IV, having short and strong legs with femora III and IV having five longitudinal rows of small tubercles, the shape of the basitarsomeres of male leg I, the distribution and relative sizes of the marginal setae on the ventral plate of the penis, and the morphology of the chelicerae and cheliceral sockets...
2017: ZooKeys
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