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https://www.readbyqxmd.com/read/28781071/effect-of-thixotropic-agents-as-additives-on-the-mechanical-properties-of-maxillofacial-silicone-elastomers
#1
Abdel Rahim M Bibars, Zeid Al-Hourani, Yousef Khader, Mark Waters
STATEMENT OF PROBLEM: The incorporation of thixotropic agents to prevent slumping during the silicone packing procedure may alter some favorable mechanical properties of the silicone elastomers and could possibly influence the success of the prosthesis. PURPOSE: The purpose of this in vitro study was to evaluate the effect of adding thixotropic agents on the mechanical properties of 3 commonly used silicone elastomers. MATERIAL AND METHODS: Specimens of 3 maxillofacial silicones (M511, Z004; Technovent Ltd, and A2000; Factor II Inc) were prepared according to the manufacturers' instructions...
August 4, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28648426/percutaneous-closure-of-symptomatic-large-tricuspid-paravalvular-regurgitation-using-two-muscular-vsd-occluders
#2
Aritra Mukherji, Rajaram Anantharaman, Raghavan Subramanyan
Paravalvular leaks are common following valve replacement surgery. Majority are benign and do not require any active intervention. However, occasionally severe paravalvular regurgitation can produce heart failure and/or hemolysis, needing closure of the defect. It is more commonly associated with aortic and mitral prosthesis, symptomatic tricuspid paravalvular regurgitation being a rare entity. In this report we present the successful percutaneous transcatheter closure of a large paravalvular tricuspid regurgitation in a 59-year old lady with history of multiple previous operations...
May 2017: Indian Heart Journal
https://www.readbyqxmd.com/read/28570398/patient-with-cleft-maxillary-hypoplasia-who-underwent-distraction-osteogenesis-and-conservative-therapies-to-postoperative-velopharyngeal-insufficiency
#3
Katsu Takahashi, Khaled Gamal Dahy, Kazuyuki Saito, Hiromu Masuoka, Shigehiko Suzuki, Kazuhisa Bessho
The authors performed distraction osteogenesis using The Maxillary Distractor System (SYNTHES) to maxillary hypoplasia patient with cleft lip palate, and consequently improved the aesthetic complexion of the patient. Velopharyngeal insufficiency developed after bone elongation; the authors improved the insufficiency with conservative therapies such as articulatory training using the bulb attached palatal lift prosthesis. And then the authors got successful and accepted postoperative speech outcome.
May 31, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28507643/imaging-of-complications-after-limb-prostheses-implantation-in-children-with-bone-tumors
#4
Beata Iwanowska, Hanna Brągoszewska, Jarosław Mądzik, Sylwia Szkudlińska-Pawlak, Izabela Kopyś-Wiszniewska, Małgorzata Jastrzębska, Barbara Kowalska, Maria Uliasz, Monika Bekiesińska-Figatowska
BACKGROUND: Tumors of the developmental age are an important problem in clinical practice. Primary bone tumors constitute 1-1.5% of all tumors, and 7% of all tumors diagnosed in the developmental age. The aim of the study was to assess the capabilities of imaging methods in diagnosing complications of limb endoprostheses in children with osteoarticular tumors. MATERIAL/METHODS: We included 155 patients with limb endoprostheses, aged 7-26 years. There were 113 patients with knee prostheses, 1 patient with bilateral knee prostheses, 16 patients with shoulder prostheses, 14 patients with hip prostheses, 11 patients with hip and knee prostheses, and 1 patient with a femoral prosthesis...
2017: Polish Journal of Radiology
https://www.readbyqxmd.com/read/28337986/simultaneous-treatment-of-temporomandibular-joint-ankylosis-with-severe-mandibular-deficiency-by-standard-tmj-prosthesis
#5
YiHui Hu, LuZhu Zhang, DongMei He, Chi Yang, MinJie Chen, ShanYong Zhang, Hui Li, Edward Ellis Iii
Temporomandibular joint (TMJ) ankylosis is a refractory disease that is difficult to predictably treat. This study evaluated the prognosis of using standard alloplastic TMJ prostheses for the treatment of TMJ ankylosis in Chinese patients with severe mandibular deficiency. Patients treated from 2013 to 2015 were reviewed. The computer-aided design and manufacture (CAD/CAM) technique was used to guide bony mass removal and locate the TMJ prosthesis (Biomet, USA). Eleven patients were included in this study. All prostheses were successfully installed and stabilized intraoperatively...
March 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093375/biomechanical-strength-and-failure-mechanism-of-different-tubercula-refixation-methods-within-the-framework-of-an-arthroplasty-for-shoulder-fracture
#6
J Fleischer, A Schleyer, R Nassutt, U Grittner, I Ojodu, S J Hopp
BACKGROUND: Tuberosity repair in shoulder fracture prosthesis implantation still remains a challenge often leading to poor functional outcomes, despite a variety of materials and suggested suture patterns. We aimed to evaluate, which forces currently used suture and cerclage materials withstand and to assess whether they are useful with regard to stability of reconstruction of tuberosities and which failure modes they display. MATERIAL AND METHODS: Using sheep infraspinatus tendons with attached tuberosities three different suture materials (suture 1: Ethibond size 2; suture 2: Orthocord size 2; suture 3: Fiberwire size 5) and a 0...
April 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/27843041/an-analysis-of-reported-cases-of-fracture-of-the-universal-exeter-femoral-stem-prosthesis
#7
Ben J R F Bolland, Matthew J Wilson, Jonathan R Howell, Matthew J W Hubble, A John Timperley, Graham A Gie
BACKGROUND: Between 1991 and 2008, approximately 80 cases of fracture (neck or stem) have been reported. This study aimed at determining factors predisposing to implant fracture. METHODS: Clinical, surgical, radiological, and retrieval data were collated. Risk factors associated with fracture were categorized to patient related (weight and activity levels), surgical related (poor medial support, component size, and placement), and anatomic/implant related (head size/offset)...
October 5, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/27818542/intestinal-perforation-by-an-ingested-foreign-body
#8
Gabriel Cleve Nicolodi, Cesar Rodrigo Trippia, Maria Fernanda F S Caboclo, Francisco Gomes de Castro, Wagner Peitl Miller, Raphael Rodrigues de Lima, Leandro Tazima, Jamylle Geraldo
OBJECTIVE: To identify the computed tomography findings suggestive of intestinal perforation by an ingested foreign body. MATERIALS AND METHODS: This was a retrospective study of four cases of surgically proven intestinal perforation by a foreign body, comparing the computed tomography findings with those described in the literature. RESULTS: None of the patients reported having ingested a foreign body, all were over 60 years of age, three of the four patients used a dental prosthesis, and all of the foreign bodies were elongated and sharp...
September 2016: Radiologia Brasileira
https://www.readbyqxmd.com/read/27788126/3d-printed-polyurethane-prosthesis-for-partial-tracheal-reconstruction-a-pilot-animal-study
#9
Soo Yeon Jung, Sang Jin Lee, Ha Yeong Kim, Hae Sang Park, Zhan Wang, Hyun Jun Kim, James J Yoo, Sung Min Chung, Han Su Kim
A ready-made, acellular patch-type prosthesis is desirable in repairing partial tracheal defects in the clinical setting. However, many of these prostheses may not show proper biological integration and biomechanical function when they are transplanted. In this study, we developed a novel 3D printed polyurethane (PU) tracheal scaffold with micro-scale architecture to allow host tissue infiltration and adequate biomechanical properties to withstand physiological tracheal condition. A half-pipe shaped PU scaffold (1...
October 27, 2016: Biofabrication
https://www.readbyqxmd.com/read/27738741/three-dimensional-patellar-tendon-fibre-kinematics-in-navigated-tka-with-and-without-patellar-resurfacing
#10
C Belvedere, A Ensini, M d'Amato, P Barbadoro, A Leardini
PURPOSE: Physiological elongation and orientation of patellar tendon fibres are among the scopes of total knee arthroplasty, but little is known in the three dimensions. The study aims to assess in vitro these variations at the intact and replaced knee, with and without patellar resurfacing. It was hypothesised that fibre patterns differ before and after prosthesis implantation, and between specific prosthesis designs. It was also expected that patellar resurfacing would affect relevant results...
October 13, 2016: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/27631661/impact-of-prosthesis-length-on-tympanic-membrane-s-and-annular-ligament-s-stiffness-and-the-resulting-middle-ear-sound-transmission
#11
Marcus Neudert, Matthias Bornitz, Nikoloz Lasurashvili, Uwe Schmidt, Thomas Beleites, Thomas Zahnert
HYPOTHESIS: Prosthesis' length creates tension in ossicular reconstructions, which directly effects the middle ear sound transmission. BACKGROUND: Relatively long prostheses are often used to stabilize the middle ear reconstruction to prevent dislocation. Thereby, tension on the flexible components such as the tympanic membrane (TM) and the annular ligament (AL) is increased. Only little is known on the amount of displacement-related stiffening of the TM and AL, as well as the consecutive reduction in middle ear transfer function (METF)...
October 2016: Otology & Neurotology
https://www.readbyqxmd.com/read/26766813/three-component-hydraulic-penile-prosthesis-malfunction-due-to-penile-fibrolipoma-secondary-to-augmentative-phalloplasty-a-case-report
#12
Gabriele Antonini, Patrizio Vicini, Ettore De Berardinis, Arianna Pacchiarotti, Vincenzo Gentile, Paul Perito
Fibrolipomas are an infrequent type of lipomas. We describe a case of a man suffering from subcutaneous penile fibrolipoma, who twelve months earlier has been submitted to augmentative phalloplasty due to aesthetic dysmorphophobia. The same patient three years earlier has been submitted to three-component hydraulic penile prostheses implantation due to erectile dysfunction. After six months from removing of the mass, the penile elongation and penile enlargement were stable, the prostheses were correctly functioning and the patient was satisfied with his sexual intercourse and life...
December 2015: Archivio Italiano di Urologia, Andrologia
https://www.readbyqxmd.com/read/26721466/vascular-prostheses-based-on-nanofibers-from-aliphatic-copolyamide
#13
P V Popryadukhin, G I Popov, I P Dobrovolskaya, V E Yudin, V N Vavilov, G Yu Yukina, E M Ivan'kova, I O Lebedeva
Tubular grafts based on nanofibers of copolymer of ε-caprolactam and hexamethylendiaminadipate were obtained by the electrospinning method. The strength of materials based on the dry nanofibers was 6.2 MPa with elongation at break of 133%, or 7.5 MPa and 299% in saline, respectively. The pressure value at which liquid started seeping through the tube wall was P = 10 kPa. Absence of cytotoxicity was proved, as well as adhesion and proliferation of mesenchymal stem cells on the surface. Tubes with inner diameter of 1 mm were tested in vivo in rat abdominal aorta...
March 2016: Cardiovascular Engineering and Technology
https://www.readbyqxmd.com/read/26413093/smooth-muscle-cell-alignment-and-phenotype-control-by-melt-spun-polycaprolactone-fibers-for-seeding-of-tissue-engineered-blood-vessels
#14
Animesh Agrawal, Bae Hoon Lee, Scott A Irvine, Jia An, Ramya Bhuthalingam, Vaishali Singh, Kok Yao Low, Chee Kai Chua, Subbu S Venkatraman
A method has been developed to induce and retain a contractile phenotype for vascular smooth muscle cells, as the first step towards the development of a biomimetic blood vessel construct with minimal compliance mismatch. Melt spun PCL fibers were deposited on a mandrel to form aligned fibers of 10 μm in diameter. The fibers were bonded into aligned arrangement through dip coating in chitosan solution. This formed a surface of parallel grooves, 10 μm deep by 10 μm across, presenting a surface layer of chitosan to promote cell surface interactions...
2015: International Journal of Biomaterials
https://www.readbyqxmd.com/read/26326671/activity-in-hand-and-tool-selective-regions-for-prosthetic-limbs-in-amputees-is-associated-with-prosthesis-usage-in-everyday-life
#15
Fiona van den Heiligenberg, Scott Macdonald, Eugene Duff, David Henderson Slater, Heidi Johansen-Berg, Jody Culham, Tamar Makin
The lateral occipitotemporal cortex (LOTC) contains subregions differentially responding to specific object categories, such as body parts and tools. This selectivity may relate to action knowledge, rather than visual properties of the objects. Prosthetic limbs share different commonalities with hands and tools (in terms of both visual and action features). Specifically, cosmetic prostheses look like hands, but can be used as tools (elongate the stump), whereas functional prostheses ("hook") do not resemble hands, but can be used as such (e...
2015: Journal of Vision
https://www.readbyqxmd.com/read/26236342/unruptured-aneurysm-of-sinus-of-valsalva-coexisting-with-the-large-ventricular-septal-defect-and-severe-aortic-regurgitation-in-a-young-man
#16
Pouya Nezafati, Mohammad Hassan Nezafati, Hamid Hoseinikhah
Introduction. Unruptured sinus of valsalva aneurysm (SVA) is a rare congenital anomaly, particularly, when it coexists with a ventricular septal defect (VSD) and aortic regurgitation due to the prolapse of the elongated aortic cusp into the VSD. In this report, we present the case of a 19-year-old young man with VSD challenging in spite of dyspnea and lower limb edema. Presentation of Case. Its diagnosis was made on the basis of transthoracic echocardiography results. Surgical management consisted of replacing the SVA with mechanical valve prosthesis...
2015: Case Reports in Medicine
https://www.readbyqxmd.com/read/26200489/central-and-peripheral-corneal-power-change-in-myopic-orthokeratology-and-its-relationship-with-2-year-axial-length-change
#17
Yuanyuan Zhong, Zhi Chen, Feng Xue, Huamao Miao, Xingtao Zhou
PURPOSE: We assessed the relationship between axial length (AL) change and corneal refractive power change induced by orthokeratology (ortho-k) contact lens wear. METHODS: A total of 88 myopic children aged 7 to 12 years were fitted with ortho-k lenses for overnight wear. Axial length was measured before enrollment and every 6 months after initiation of lens wear up to 24 months. Corneal apical refractive power and the mean power of each concentric ring from 0.5 to 7...
July 2015: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/25861192/traumatic-globe-luxation-associated-with-orbital-fracture-in-a-child-a-case-report-and-literature-review
#18
Márcio Bruno Figueiredo Amaral, Matheus Furtado Carvalho, André Baptista Ferreira, Ricardo Alves Mesquita
Orbital fracture associated with traumatic globe luxation is rare, as it generally requires trauma with high energy for this to occur. The present case report focused on a child who had been hit by a motorcycle, leading to a globe luxation of the left eye and fractures of the superolateral orbital walls. The patient presented initial cosmetic and psychological benefits from the repositioning of the intact globe and the reduction of the orbital fractures. However, a subsequent evisceration of the globe was required due to persistent proptosis and pain...
March 2015: Journal of Maxillofacial and Oral Surgery
https://www.readbyqxmd.com/read/25738090/gingival-veneer-a-novel-technique-of-masking-gingival-recession
#19
Praful Choudhari, Arpita Pillai, R Zade, Ramesh Amirishetty, Sunaina Shetty
One of the most distressing aspects of periodontitis is the unesthetic appearance of maxillary and mandibular anteriors. The elongation of the crowns due to root exposure and increased interdental spacing results in unesthetic appearance. Surgical procedures for gingival recession coverage do not have acceptable results in cases of severe gingival recession. So nonsurgical methods like gingival veneers should be considered as a treatment modality in such cases. This article aims to revisit the gingival veneer: its uses, advantages, disadvantages, and its fabrication...
January 2015: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/25579940/the-processing-of-mg-alloy-micro-tubes-for-biodegradable-vascular-stents
#20
Fei Liu, Chenxin Chen, Jialin Niu, Jia Pei, Hua Zhang, Hua Huang, Guangyin Yuan
In this study, through a combination of hot extrusion, cold rolling and drawing, three Mg alloys, Mg-Nd-Zn-Zr (abbr. JDBM), AZ31 and WE43, were successfully fabricated into the high-quality micro-tubes with 3.00mm outer diameter and 180μm thickness for biodegradable stents. This processing method overcame the shortcoming of the poor workability of Mg alloys and could be applied to fabricate sufficiently long tubes with low dimensional errors within 2.8%. Microstructure observation demonstrated that the as-annealed JDBM, AZ31 and WE43 micro-tubes had more uniformly distributed grains with an average size of 10...
March 2015: Materials Science & Engineering. C, Materials for Biological Applications
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