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https://www.readbyqxmd.com/read/29340344/biomechanical-comparison-of-different-implant-inclinations-and-cantilever-lengths-in-all-on-4-treatment-concept-by-three-dimensional-finite-element-analysis
#1
Oguz Ozan, Sevcan Kurtulmus-Yilmaz
PURPOSE: The aim of this study was to evaluate the effect of implant inclination and cantilever length on the stress distribution in mandibular cortical bone, implant, abutment, prosthetic framework, and prosthetic screw via three-dimensional (3D) finite element analysis (FEA). MATERIALS AND METHODS: Four different finite element models (0-0, 17-17, 30-30, 45-30) were designed according to the tilting angle (0, 17, 30, and 45 degrees) of the posterior implant and angle of multiunit abutments (0, 17, and 30 degrees)...
January 2018: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29339793/skin-inspired-highly-stretchable-and-conformable-matrix-networks-for-multifunctional-sensing
#2
Qilin Hua, Junlu Sun, Haitao Liu, Rongrong Bao, Ruomeng Yu, Junyi Zhai, Caofeng Pan, Zhong Lin Wang
Mechanosensation electronics (or Electronic skin, e-skin) consists of mechanically flexible and stretchable sensor networks that can detect and quantify various stimuli to mimic the human somatosensory system, with the sensations of touch, heat/cold, and pain in skin through various sensory receptors and neural pathways. Here we present a skin-inspired highly stretchable and conformable matrix network (SCMN) that successfully expands the e-skin sensing functionality including but not limited to temperature, in-plane strain, humidity, light, magnetic field, pressure, and proximity...
January 16, 2018: Nature Communications
https://www.readbyqxmd.com/read/29322318/total-knee-arthroplasty-with-unexplained-pain-new-insights-from-kinematics
#3
Célia Planckaert, Gabriel Larose, Pierre Ranger, Marc Lacelle, Alexandre Fuentes, Nicola Hagemeister
INTRODUCTION: Up to 20% of total knee arthroplasty patients remain unsatisfied post-surgery, and a large proportion of them report anterior knee pain. This study aims to verify whether patients who experience anterior knee pain after total knee arthroplasty (TKA) will exhibit kinematic characteristics similar to those associated with patellofemoral syndrome, including in the frontal and transverse planes. MATERIALS AND METHODS: Using four different assessment methods [radiological, patient-reported outcome, musculoskeletal assessment with functional performance testing, and a 3D kinematic assessment during gait], the clinical and 3D knee kinematic profiles of three groups were compared: a painful and an asymptomatic TKA group and a healthy control group...
January 10, 2018: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/29310359/natural-teeth-retained-splint-based-on-a-patient-specific-3d-printed-mandible-used-for-implant-surgery-and-vestibuloplasty-a-case-report
#4
Helin Xing, Jinshuang Wu, Lei Zhou, Sefei Yang
RATIONALE: With respect to improving the quality of oral rehabilitation, the management of keratinized mucosa is as important as bone condition for implant success. To enhance this management, a natural teeth-retained splint based on a patient-specific 3-dimensional (3D) printed mandible was used in vestibuloplasty to provide sufficient keratinized mucosa around dental implants to support long-term implant maintenance. PATIENT CONCERNS: A 28-year-old male patient had a fracture of the anterior andible 1 year ago, and the fracture was treated with titanium...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29300207/stress-distribution-in-splinted-and-unsplinted-implant-supported-maxillary-overdentures-a-3d-finite-element-analysis
#5
Allahyar Geramy, Sareh Habibzadeh
INTRODUCTION: This study was accomplished to assess the biomechanical state of splinting in implant-supported maxillary overdentures. MATERIALS AND METHODS: Two models of maxillary overdentures were designed in SolidWorks 2011. The first model included 4 separate implants and ball abutments, whereas the second one included 4 splinted implants connected with a bar. Evaluation was performed in ANSYS Workbench software with 200 N load applied at the molar-premolar region, bilaterally...
January 3, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29285326/3d-x-ray-microscopic-analysys-on-a-prosthetically-loaded-implant-with-platform-switching-and-conical-connection-a-case-report
#6
M DI Girolamo, L Baggi, P Pirelli, L Pappalardo, G Massei, F Iaculli, G Iezzi, A Piattelli, R Calcaterra
The histological and histomorphometrical examination were the gold standard in the qualitative and quantitative analyses of the peri-implant tissue around the implant. In recent years, the field of microscopy has witnessed a considerable enhancement of the performance of microscopes that have very high resolution performance and allowing very sophisticated analysis even larger than traditional preparations. The possibility to have an affordable analyses of whole implant with the surrounding different tissues (soft and hard tissues) without the traditional pre-treatment necessary for the histological analysis may represent a goal to describe material properties and behaviors or simply to visualize structural details...
July 2017: Oral & Implantology
https://www.readbyqxmd.com/read/29250661/effects-of-malalignment-angle-on-the-contact-stress-of-knee-prosthesis-components-using-finite-element-method
#7
Daniela TarniŢă, Dan Marian Calafeteanu, IonuŢ Daniel Geonea, Alin Petcu, DănuŢ Nicolae TarniŢă
In this paper, the complex 3D virtual model of the prosthetic knee is obtained using embedded applications: DesignModeler and SpaceClaim under ANSYS Workbench 14.5 software package. A number of six cases of prosthetic knee joint assembly, depending on the malalignment angle, are developed. Stress maps and the values of the maximum von Mises stress on the three prosthesis components: polyethylene insert, tibial component and femoral component, for all studied prosthetic knee assemblies were obtained. The results show that as the malalignment angle increases, the values of von Mises stresses increase in all prosthesis components...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/29224416/utilising-three-dimensional-printing-techniques-when-providing-unique-assistive-devices-a-case-report
#8
Sarah Jane Day, Shaun Patrick Riley
BACKGROUND: The evolution of three-dimensional printing into prosthetics has opened conversations about the availability and cost of prostheses. This report will discuss how a prosthetic team incorporated additive manufacture techniques into the treatment of a patient with a partial hand amputation to create and test a unique assistive device which he could use to hold his French horn. Case description and methods: Using a process of shape capture, photogrammetry, computer-aided design and finite element analysis, a suitable assistive device was designed and tested...
December 1, 2017: Prosthetics and Orthotics International
https://www.readbyqxmd.com/read/29216869/horizontal-ridge-reconstruction-of-the-anterior-maxilla-using-customized-allogeneic-bone-blocks-with-a-minimally-invasive-technique-a-case-series
#9
Laurent Venet, Michel Perriat, Francesco Guido Mangano, Thomas Fortin
BACKGROUND: Different surgical procedures have been proposed to achieve horizontal ridge reconstruction of the anterior maxilla; all these procedures, however, require bone replacement materials to be adapted to the bone defect at the time of implantation, resulting in complex and time-consuming procedures. The purpose of this study was to describe how to use a 3D printed hardcopy model of the maxilla to prepare customized milled bone blocks, to be adapted on the bone defect areas using a minimally invasive subperiosteal tunneling technique...
December 8, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/29211127/evaluation-of-stress-distribution-in-endodontically-weakened-teeth-restored-with-different-crown-materials-3d-fea-analysis
#10
Izabela C M Moris, Carolina Alves Moscardini, Luana Kelle Batista Moura, Yara Teresinha Corrêa Silva-Sousa, Erica Alves Gomes
This study evaluated the stress distribution in endodontically treated teeth, weakened (W) or not weakened (NW), restored with different materials of prosthetic crown using 3D-FEA. Models of a maxillary canine were constructed based on micro-CT images and divided into the groups: G1 (control) - sound tooth; G2 to G7 - endodontically treated teeth restored with glass fiber post (GFP); which G2 to G4 simulated NW root and G5 to G7 simulated W root. For crown material the teeth were restored with: G2 and G5: metallic coping and ceramic veneering, G3 and G6: zirconia coping and ceramic veneering, G4 and G7: alumina coping and ceramic veneering...
November 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29201828/hand-functions-of-myoelectric-and-3d-printed-pressure-sensored-prosthetics-a-comparative-study
#11
Kyu Ho Lee, Hobeom Bin, KeunBae Kim, So Young Ahn, Bong-Ok Kim, Soo-Kyung Bok
The loss of an upper limb significantly limits the functional activities of daily living. A huge emphasis is placed on the manipulation, shape, weight, and comfort of a prosthesis, to enable its use as an inherent body part. Even with technological advances, customized upper-extremity myoelectric prosthesis remain heavy and expensive. The high cost of upper-extremity prosthesis is an especially steep economic barrier for patients. Three-dimensional (3D) printing is a promising avenue for reducing the cost of prosthesis...
October 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/29184103/inconsistency-in-the-crown-to-root-ratios-of-single-rooted-premolars-measured-by-2d-and-3d-examinations
#12
Hsiang-Hsi Hong, Heng-Liang Liu, Adrienne Hong, Pu Chao
Micro-computed tomography (micro-CT) was applied to elucidate the relationship between the three-dimensional (3D) root surface area (RSA) and two-dimensional (2D) crown-to-root ratio (CRR) of extracted teeth to classify the periodontitis and assign a periodontal/prosthetic prognosis. A total of 31 maxillary and 35 mandibular single-rooted human premolars were examined. The amount of periodontal support on the basis of 3D RSA and 2D root length (RL) at CRRs of 1:1, 5:4, 3:2, and 2:1 were analyzed. Both maxillary and mandibular premolars demonstrated a nonsignificant RSA percentage at the evaluated CRRs...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29139286/highly-sensitive-flexible-pressure-sensors-based-on-printed-organic-transistors-with-centro-apically-self-organized-organic-semiconductor-microstructures
#13
So Young Yeo, Sangsik Park, Yeonjin Yi, Do Hwan Kim, Jung Ah Lim
A highly sensitive pressure sensor based on a printed organic transistors with three-dimensionally self-organized organic semiconductor microstructures were demonstrated. A unique organic transistor with semiconductor channels positioned at the highest summit of printed cylindrical microstructures was achieved simply by printing an organic semiconductor and polymer blend on the plastic substrate without the use of additional etching or replication processes. A combination of the printed organic semiconductor microstructure and an elastomeric top-gate dielectric resulted in a highly sensitive OFET pressure sensor with a high pressure sensitivity of 1...
November 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29125215/additive-manufacturing-a-comparative-analysis-of-dimensional-accuracy-and-skin-texture-reproduction-of-auricular-prostheses-replicas
#14
Alexey Unkovskiy, Sebastian Spintzyk, Detlef Axmann, Eva-Maria Engel, Heiner Weber, Fabian Huettig
PURPOSE: The use of computer-aided design/computer-aided manufacturing (CAD/CAM) and additive manufacturing in maxillofacial prosthetics has been widely acknowledged. Rapid prototyping can be considered for manufacturing of auricular prostheses. Therefore, so-called prostheses replicas can be fabricated by digital means. The objective of this study was to identify a superior additive manufacturing method to fabricate auricular prosthesis replicas (APRs) within a digital workflow. MATERIALS AND METHODS: Auricles of 23 healthy subjects (mean age of 37...
November 10, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29116866/functional-changes-through-the-usage-of-3d-printed-transitional-prostheses-in-children
#15
Jorge M Zuniga, Jean L Peck, Rakesh Srivastava, James E Pierce, Drew R Dudley, Nicholas A Than, Nicholas Stergiou
INTRODUCTION: There is limited knowledge on the use of 3 D-printed transitional prostheses, as they relate to changes in function and strength. Therefore, the purpose of this study was to identify functional and strength changes after usage of 3 D-printed transitional prostheses for multiple weeks for children with upper-limb differences. MATERIALS AND METHODS: Gross manual dexterity was assessed using the Box and Block Test and wrist strength was measured using a dynamometer...
November 8, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/29116295/effect-of-ceramic-thickness-grinding-and-aging-on-the-mechanical-behavior-of-a-polycrystalline-zirconia
#16
Rodrigo Diniz Prado, Gabriel Kalil Rocha Pereira, Marco Antonio Bottino, Renata Marques de Melo, Luiz Felipe Valandro
Monolithic restorations of Y-TZP have been recommended as a restorative alternative on prosthetic dentistry as it allows a substantial reduction of ceramic thickness, which means a greater preservation of tooth structure. However, the influence of grinding and aging when using a thinner layer of the material is unclear. This investigation aimed to evaluate and compare the effects of ceramic thickness (0.5 mm and 1.0 mm), grinding and aging (low-temperature degradation) on the mechanical behavior and surface characteristics of a full-contour Y-TZP ceramic...
November 6, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/29068576/assessment-of-the-primary-stability-of-root-analog-zirconia-implants-designed-using-cone-beam-computed-tomography-software-by-means-of-the-periotest%C3%A2-device-an-ex-vivo-study-a-preliminary-report
#17
Jacek Matys, Katarzyna Świder, Rafał Flieger, Marzena Dominiak
BACKGROUND: The implant primary stability is a fundamental prerequisite for a success of osseointegration process which determines the prosthetic reconstruction time. OBJECTIVES: The aim of the present study was to assess the quality and precision of modern conical bone computer tomography (CBCT) software in preparing root analog zirconia implants (RAZIs) by measuring its primary stability by means of the Periotest device. MATERIAL AND METHODS: Thirteen pig jaws with proper erupted first premolar (P1) teeth were used in the study...
August 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/29060829/image-based-fluid-dynamics-analysis-of-left-ventricle-outflow-tract-pressure-gradient-after-deployment-transcatheter-mitral-valve
#18
Yousef Alharbi, Nigel H Lovell, James Otton, David Muller, Amr Al Abed, Socrates Dokos
The goal of this study was to develop an image-based model to computational investigate blood flow and pressure gradients resulting from left ventricular (LV) wall motion after the implantation of a mitral valve (MV) prosthesis. Two image-based 3D models were reconstructed from multi-slice computed tomography images obtained from patients undergoing transcatheter MV replacement. Navier-Stokes equations were then used to compute the fluid motion. Outflow tract obstruction of the models with MV prosthesis were identified by calculating the difference between LV systolic and aortic pressures...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29060020/design-implementation-and-performance-validation-of-uompro-artificial-hand-towards-affordable-hand-prostheses
#19
Kalinga Nisal, Isuru Ruhunge, Janaka Subodha, Chamika Janith Perera, Thilina Dulantha Lalitharatne
In this paper, an anthropometric, active artificial prosthetic hand named UOMPro (University of Moratuwa Prosthetic) is proposed. The UOMPro hand is realized during research on developing affordable hand prostheses for use by people mainly in developing countries where purchasing high cost state-of-the-art commercial hand prostheses may be beyond their capacity. The proposed hand is developed with an affordable cost (<; 850 USD) and it consists of 6 Degrees of Freedom (DOF) including flexion/extension motions of five fingers and abduction/adduction motion of the thumb finger...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28979183/nanowire-fet-based-neural-element-for-robotic-tactile-sensing-skin
#20
William Taube Navaraj, Carlos García Núñez, Dhayalan Shakthivel, Vincenzo Vinciguerra, Fabrice Labeau, Duncan H Gregory, Ravinder Dahiya
This paper presents novel Neural Nanowire Field Effect Transistors (υ-NWFETs) based hardware-implementable neural network (HNN) approach for tactile data processing in electronic skin (e-skin). The viability of Si nanowires (NWs) as the active material for υ-NWFETs in HNN is explored through modeling and demonstrated by fabricating the first device. Using υ-NWFETs to realize HNNs is an interesting approach as by printing NWs on large area flexible substrates it will be possible to develop a bendable tactile skin with distributed neural elements (for local data processing, as in biological skin) in the backplane...
2017: Frontiers in Neuroscience
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