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https://www.readbyqxmd.com/read/28208996/stress-distribution-under-commercial-denture-liners-a-finite-element-and-clinical-analysis
#1
Rahul Shrivastava, Saurabh Chaturvedi, Ashok Kumar Verma, Mariyum Ali, Amrita Nagendra, Mudita Chaturvedi
INTRODUCTION: Previous studies have shown that 20-30% of denture users have been dissatisfied with their dentures. AIM: To evaluate the stress pattern under elastic and viscoelastic denture liners using 3-Dimensional Finite Element Analysis (FEA) and its clinical correlation using a questionnaire. MATERIALS AND METHODS: The study had both in-vitro and in-vivo phases. In in-vitro phase fabrication of a virtual parametric model of edentulous maxilla and dentures with overlying mucosa was made...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28208758/a-study-on-the-thermomechanical-reliability-risks-of-through-silicon-vias-in-sensor-applications
#2
Shuai Shao, Dapeng Liu, Yuling Niu, Kathy O'Donnell, Dipak Sengupta, Seungbae Park
Reliability risks for two different types of through-silicon-vias (TSVs) are discussed in this paper. The first is a partially-filled copper TSV, if which the copper layer covers the side walls and bottom. A polymer is used to fill the rest of the cavity. Stresses in risk sites are studied and ranked for this TSV structure by FEA modeling. Parametric studies for material properties (modulus and thermal expansion) of TSV polymer are performed. The second type is a high aspect ratio TSV filled by polycrystalline silicon (poly Si)...
February 9, 2017: Sensors
https://www.readbyqxmd.com/read/28190816/fracture-resistance-of-zirconia-composite-veneered-crowns-in-comparison-with-zirconia-porcelain-crowns
#3
Omar Alsadon, David Patrick, Anthony Johnson, Sarah Pollington, Duncan Wood
The objectives were to evaluate the fracture resistance and stress concentration in zirconia/composite veneered crowns in comparison to zirconia/porcelain crowns using occlusal fracture resistance and by stress analysis using finite element analysis method. Zirconia substructures were divided into two groups based on the veneering material. A static load was applied occlusally using a ball indenter and the load to fracture was recorded in Newtons (N). The same crown design was used to create 3D crown models and evaluated using FEA...
February 11, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28185216/clinical-evaluation-of-bone-strength-and-fracture-risk
#4
REVIEW
Chantal M J de Bakker, Wei-Ju Tseng, Yihan Li, Hongbo Zhao, X Sherry Liu
PURPOSE OF REVIEW: This paper seeks to evaluate and compare recent advances in the clinical assessment of the changes in bone mechanical properties that take place as a result of osteoporosis and other metabolic bone diseases and their treatments. RECENT FINDINGS: In addition to the standard of DXA-based areal bone mineral density (aBMD), a variety of methods, including imaging-based structural measurements, finite element analysis (FEA)-based techniques, and alternate methods including ultrasound, bone biopsy, reference point indentation, and statistical shape and density modeling, have been developed which allow for reliable prediction of bone strength and fracture risk...
February 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28167115/association-between-autistic-traits-and-emotion-adaptation-to-partially-occluded-faces
#5
Chengwen Luo, Edwin Burns, Hong Xu
Prolonged exposure to an emotional face (e.g., a happy face) leads to a repulsive bias in the emotion perception of subsequently presented faces (e.g., they are perceived as sadder). These shifts in perception are known as facial emotion aftereffects (FEA). People with autism spectrum disorders and their relatives have diminished holistic perception of complex objects. Levels of autism can be measured continuously in the general population in the form of autistic traits. Prior work has failed to find any association between levels of autism and FEA in adults, possibly due to non-holistic processing strategies employed by those at the higher end of the spectrum...
February 3, 2017: Vision Research
https://www.readbyqxmd.com/read/28160353/a-review-on-microbiological-decontamination-of-fresh-produce-with-nonthermal-plasma
#6
REVIEW
C Pignata, D D'Angelo, E Fea, G Gilli
Food safety is a critical public health issue for consumers and the food industry because microbiological contamination of food causes considerable social and economic burdens on health care. Most foodborne illness comes from animal production, but as of the mid-1990s in the United States and more recently in the European Union, the contribution of fresh produce to foodborne outbreaks has rapidly increased. Recent studies have suggested that sterilisation with nonthermal plasma could be a viable alternative to the traditional methods for the decontamination of heat-sensitive materials or food because this technique proves capable of eliminating microorganisms on surfaces without altering the substrate...
February 4, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28154316/effect-of-frame-design-and-veneering-material-on-biomechanical-behavior-of-zirconia-dental-crowns-veneered-with-overpressing-ceramics
#7
Liliana Porojan, Florin Topală, Sorin Porojan, Cristina Savencu
The objective of this investigation was to compare alternative framework designs of molar zirconia crowns veneered with various overpressing ceramics and to predict the biomechanical behavior based on the stress evaluation. The hypothesis of the study is that the zirconia framework design and type of the veneering material, using the same technological procedure, may influence the biomechanical behavior of the restorations. Three geometric models with differential coping designs (uniform thickness, cutback and buccal reduction) were developed and two types of hot-pressed ceramics (leucite and lithium disilicate reinforced) were analyzed for the veneers...
February 1, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28153036/biomechanical-comparison-of-multilevel-lateral-interbody-fusion-with-and-without-supplementary-instrumentation-a-three-dimensional-finite-element-study
#8
Xilin Liu, Jun Ma, Paul Park, Xiaodong Huang, Ning Xie, Xiaojian Ye
BACKGROUND: Lateral lumbar interbody fusion (LLIF) is a popular, minimally invasive technique that is used to address challenging multilevel degenerative spinal diseases. It remains controversial whether supplemental instrumentation should be added for multilevel LLIF. In this study, we compared the kinematic stability afforded by stand-alone lateral cages with those supplemented by bilateral pedicle screws and rods (PSR), unilateral PSR, or lateral plate (LP) fixation using a finite-element (FE) model of a multi-level LLIF construct with simulated osteoporosis...
February 2, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/28137635/in-silico-analysis-of-the-biomechanical-stability-of-commercially-pure-ti-and-ti-15mo-plates-for-the-treatment-of-mandibular-angle-fracture
#9
Satoshi Yamaguchi, Rodolfo B Anchieta, Fernando P S Guastaldi, Nick Tovar, Daisuke Tawara, Satoshi Imazato, Paulo G Coelho
PURPOSE: To investigate the influence of different materials and fixation methods on maximum principal stress (MPS) and displacement in reconstruction plates using in silico 3-dimensional finite element analysis (3D-FEA). MATERIALS AND METHODS: Computer-assisted designed (CAD) models of the mandible and teeth were constructed. Champy and AO/ASIF plates and fixation screws were designed with CAD software. 3D-FEA was performed by image-based CAE software. Maximum and minimum values of biomechanical stability, MPS, and displacement distribution were compared in Champy and AO/ASIF plates made from commercially pure titanium grade 2 (cp-Ti) and a titanium-and-molybdenum (14...
January 4, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28118035/is-the-outcome-at-surgery-different-when-flat-epithelial-atypia-and-lobular-neoplasia-are-found-in-association-at-biopsy
#10
Mona El Khoury, Lilia Maria Sanchez, Lucie Lalonde, Isabelle Trop, Julie David, Benoît Mesurolle
OBJECTIVES: To assess the impact on the final outcome at surgery of Flat Epithelial Atypia (FEA) when found concomitantly with Lobular Neoplasia (LN) in biopsy specimens, compared to pure biopsy proven FEA. METHODS: Institutional review board approval was obtained. A retrospective review of our database between 2009 and 2013 identified eighty-one women (mean age 54, range 38-90) with 81 FEA biopsy-proven lesions. These were pure or associated with LN only in respectively 59/81 (73%) and 22/81 (27%)...
January 24, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28114490/adaptation-reveals-that-facial-expression-averaging-occurs-during-rapid-serial-presentation
#11
Haojiang Ying, Hong Xu
How do we interpret the rapidly changing visual stimuli we encounter? How does our past visual experience shape our perception? Recent work has suggested that our visual system is able to interpret multiple faces presented temporally via integration or ensemble coding. Visual adaptation is widely used to probe such short term plasticity. Here we use an adaptation paradigm to investigate whether integration or averaging of emotional faces occurs during a rapid serial visual presentation (RSVP). In four experiments, we tested whether the RSVP of distinct emotional faces could induce adaptation aftereffects and whether these aftereffects were of similar magnitudes as their statistically averaged face...
January 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28114012/ultrasonic-needles-for-bone-biopsy
#12
Andrew Mathieson, Robert Wallace, Rebecca Cleary, Li Li, Hamish Simpson, Margaret Lucas
Bone biopsy is an invasive clinical procedure where a bone sample is recovered for analysis during the diagnosis of a medical condition. When the architecture of the bone tissue is required to be preserved, a core-needle biopsy is taken. Although this procedure is performed while the patient is under local anaesthesia, the patient can still experience significant discomfort. Additionally, large haematoma can be induced in the soft tissue surrounding the biopsy site due to the large axial and rotational forces which are applied through the needle to penetrate bone...
December 7, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28113891/design-of-a-collapse-mode-cmut-with-an-embossed-membrane-for-improving-output-pressure
#13
Yuanyu Yu, Sio Pun, Peng Un Mak, Ching-Hsiang Cheng, Jiujiang Wang, Pui In Mak, Mang I Vai
Capacitive micromachined ultrasonic transducers (CMUTs) have emerged as a competitive alternative to piezoelectric ultrasonic transducers, especially in medical ultrasound imaging and therapeutic ultrasound applications which require high output pressure. However, as compared with piezoelectric ultrasonic transducers, the output pressure capability of CMUTs remains to be improved. In this paper, a novel structure is proposed by forming an embossed vibrating membrane on a CMUT cell operating in the collapse-mode to increase the maximum output pressure...
April 15, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28111069/mechanical-characterization-and-comparison-of-energy-storage-and-return-prostheses
#14
Stacey M Rigney, Anne Simmons, Lauren Kark
The suitability of finite element analysis (FEA) for standardizing the mechanical characterization of energy storage and return (ESAR) prostheses was investigated. A methodology consisting of both experimental and numerical analysis was proposed and trialed for the Vari-flex(®) Modular(TM), Flex-foot Cheetah and Cheetah Xtreme by Össur(®) and a 1E90 Sprinter by Ottobock(®). Gait analysis was conducted to determine suitable orientation angles for non-destructive testing (NDT) of the ESAR prostheses followed by a quasi-static inverse FEA procedure within COMSOL Multiphysics(®), where the NDT conditions were replicated to determine the homogenized material properties of the prostheses...
January 20, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28108173/broach-handle-design-changes-force-distribution-in-the-femur-during-total-hip-arthroplasty
#15
Dustin A Greenhill, Pooyan Abbasi, Kurosh Darvish, Andrew M Star
BACKGROUND: Curved broach handles were developed to overcome limited surgical exposures during total hip arthroplasty. Some authors report increased intraoperative fracture rates during limited exposures. This study evaluates mechanical force ratios transmitted to the bone while broaching with curved vs straight handles. METHODS: An experimental model utilized a 6-axis load cell to measure force distributions produced by 4 different broach handles, each with increasing offset and curvature...
December 29, 2016: Journal of Arthroplasty
https://www.readbyqxmd.com/read/28097386/biomechanical-analysis-of-clavicle-hook-plate-implantation-with-different-hook-angles-in-the-acromioclavicular-joint
#16
Li-Kun Hung, Kuo-Chih Su, Wen-Hsien Lu, Cheng-Hung Lee
PURPOSE: A clavicle hook plate is a simple and effective method for treating acromioclavicular dislocation and distal clavicle fractures. However, subacromial osteolysis and peri-implant fractures are complicated for surgeons to manage. This study uses finite element analysis (FEA) to investigate the post-implantation biomechanics of clavicle hook plates with different hook angles. METHODS: This FEA study constructed a model with a clavicle, acromion, clavicle hook plate, and screws to simulate the implantation of clavicle hook plates at different hook angles (90°, 95°, 100°, 105°, and 110°) for treating acromioclavicular joint dislocations...
January 18, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28089389/three-dimensional-finite-element-model-to-predict-patterns-of-pterygomaxillary-dysjunction-during-le-fort-i-osteotomy
#17
H Fujii, N Kuroyanagi, T Kanazawa, S Yamamoto, H Miyachi, K Shimozato
The aim of this study was to determine whether non-linear three-dimensional finite element analysis (3D-FEA) can be applied to simulate pterygomaxillary dysjunction during Le Fort I osteotomy (LFI) not involving a curved osteotome (LFI-non-COSep), and to predict potential changes in the fracture pattern associated with extending the cutting line. Computed tomography (CT) image data (100 snapshots) after LFI were converted to 3D-CT images. 3D-FEA models were built using preoperative CT matrix data and used to simulate pterygomaxillary dysjunction...
January 12, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28088646/bone-microarchitecture-in-adolescent-boys-with-autism-spectrum-disorder
#18
Ann M Neumeyer, Natalia Cano Sokoloff, Erin McDonnell, Eric A Macklin, Christopher J McDougle, Madhusmita Misra
BACKGROUND: Boys with autism spectrum disorder (ASD) have lower areal bone mineral density (aBMD) than typically developing controls (TDC). Studies of volumetric BMD (vBMD) and bone microarchitecture provide information about fracture risk beyond that provided by aBMD but are currently lacking in ASD. OBJECTIVES: To assess ultradistal radius and distal tibia vBMD, bone microarchitecture and strength estimates in adolescent boys with ASD compared to TDC. DESIGN/METHODS: Cross-sectional study of 34 boys (16 ASD, 18 TDC) that assessed (i) aBMD at the whole body (WB), WB less head (WBLH), hip and spine using dual X-ray absorptiometry (DXA), (ii) vBMD and bone microarchitecture at the ultradistal radius and distal tibia using high-resolution peripheral quantitative CT (HRpQCT), and (iii) bone strength estimates (stiffness and failure load) using micro-finite element analysis (FEA)...
January 11, 2017: Bone
https://www.readbyqxmd.com/read/28076414/a-mri-compatible-combined-mechanical-loading-and-mr-elastography-setup-to-study-deformation-induced-skeletal-muscle-damage-in-rats
#19
Jules L Nelissen, Larry de Graaf, Willeke A Traa, Tom J L Schreurs, Kevin M Moerman, Aart J Nederveen, Ralph Sinkus, Cees W J Oomens, Klaas Nicolay, Gustav J Strijkers
Deformation of skeletal muscle in the proximity of bony structures may lead to deep tissue injury category of pressure ulcers. Changes in mechanical properties have been proposed as a risk factor in the development of deep tissue injury and may be useful as a diagnostic tool for early detection. MRE allows for the estimation of mechanical properties of soft tissue through analysis of shear wave data. The shear waves originate from vibrations induced by an external actuator placed on the tissue surface. In this study a combined Magnetic Resonance (MR) compatible indentation and MR Elastography (MRE) setup is presented to study mechanical properties associated with deep tissue injury in rats...
2017: PloS One
https://www.readbyqxmd.com/read/28068473/optimizing-the-field-emission-properties-of-zno-nanowire-arrays-by-precisely-tuning-the-population-density-and-application-in-large-area-gated-field-emitter-arrays
#20
Yufeng Li, Zhipeng Zhang, Guofu Zhang, Long Zhao, Shaozhi Deng, Ningsheng Xu, Jun Chen
Zinc oxide (ZnO) nanowires are prepared for application in large area gated field emitter arrays (FEAs). By oxidizing Al-coated Zn films, the population density of the ZnO nanowires was tuned precisely by varying the thickness of the Al film. The nanowire density decreased linearly as the thickness of the Al film increased. Optimal field emission properties with a turn-on field of 6.21 V μm(-1) and current fluctuations less than 1% are obtained. This can be explained by the minimized screening effect and good electrical conductivity of the back-contact layer...
February 1, 2017: ACS Applied Materials & Interfaces
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