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https://www.readbyqxmd.com/read/28646185/the-relation-between-residual-stress-interfacial-structure-and-the-joint-property-in-the-sio2f-sio2-nb-joints
#1
Qiang Ma, Zhuo Ran Li, Lai Shan Yang, Jing Huang Lin, Jin Ba, Ze Yu Wang, Jun Lei Qi, Ji Cai Feng
In order to achieve a high-quality joint between SiO2f/SiO2 and metals, it is necessary to address the poor wettability of SiO2f/SiO2 and the high residual stress in SiO2f/SiO2-Nb joint. Here, we simultaneously realize good wettability and low residual stress in SiO2f/SiO2-Nb joint by combined method of HF etching treatment and Finite Element Analysis (FEA). After etching treatment, the wettability of E-SiO2f/SiO2 was improved, and the residual stress in the joint was decreased. In order to better control the quality of joints, efforts were made to understand the relationship between surface structure of E-SiO2f/SiO2 and residual stress in joint using FEA...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28645850/biomechanical-analysis-using-fea-and-experiments-of-a-standard-plate-method-versus-three-cable-methods-for-fixing-acetabular-fractures-with-simultaneous-tha
#2
Mina S R Aziz, Omar Dessouki, Saeid Samiezadeh, Habiba Bougherara, Emil H Schemitsch, Radovan Zdero
Acetabular fractures potentially account for up to half of all pelvic fractures, while pelvic fractures potentially account for over one-tenth of all human bone fractures. This is the first biomechanical study to assess acetabular fracture fixation using plates versus cables in the presence of a total hip arthroplasty, as done for the elderly. In Phase 1, finite element (FE) models compared a standard plate method versus 3 cable methods for repairing an acetabular fracture (type: anterior column plus posterior hemi-transverse) subjected to a physiological-type compressive load of 2207N representing 3 x body weight for a 75kg person during walking...
June 20, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28623521/exploring-for-the-optimal-structural-design-for-the-3d-printing-technology-for-cranial-reconstruction-a-biomechanical-and-histological-study-comparison-of-solid-vs-porous-structure
#3
Jun Young Lim, Namhyun Kim, Jong-Chul Park, Sun K Yoo, Dong Ah Shin, Kyu-Won Shim
PURPOSE: Cranioplasty for recovering skull defects carries the risk for a number of complications. Various materials are used, including autologous bone graft, metallic materials, and non-metallic materials, each of which has advantages and disadvantages. If the use of autologous bone is not feasible, those artificial materials also have constraints in the case of complex anatomy and/or irregular defects. MATERIAL AND METHODS: This study used metal 3D-printing technology to overcome these existing drawbacks and analyze the clinical and mechanical performance requirements...
June 16, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28621279/comparative-evaluation-of-stress-developed-on-rotary-retreatment-instruments-during-retrieval-of-gutta-percha
#4
Dhanasekaran Sihivahanan, T Vinay Kumar Reddy, Anchu Rachel Thomas, Natarajan Senthilnathan, Murali Sivakumar, Sushmita Shivanna
AIM: The aim of the study is to compare the maximum stress distribution on the rotary retreatment instruments within the root canal at cervical, middle, and the apical one-third during retreatment of gutta-percha. MATERIALS AND METHODS: A human mandibular premolar was scanned, and three-dimensional geometry of the root was reconstructed using finite element analysis (FEA) software package (ANSYS). The basic model was kept unchanged; tooth models were created using the same dimensions and divided into two groups as follows: Group I: ProTaper Universal retreatment system and group II: Mtwo rotary retreatment system...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28615109/study-of-guided-wave-propagation-on-a-plate-between-two-solid-bodies-with-imperfect-contact-conditions
#5
A J Balvantín, J A Diosdado-De-la-Peña, P A Limon-Leyva, E Hernández-Rodríguez
In this work, fundamental symmetric Lamb wave S0 mode is characterized in terms of its velocity variation as function of the interfacial conditions between solid bodies in contact. Imperfect contact conditions are numerically and experimentally determined by using ultrasonic Lamb wave propagation parameters. For the study, an experimental system was used, formed by two solid aluminum rods (25.4mm in diameter) axially loading a thin aluminum plate to control contact interfacial stiffness. The axially applied load on the aluminum plate was varied from 0MPa to 10MPa...
June 3, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28602314/dynamic-equivalence-of-ultrasonic-stress-wave-propagation-in-solids
#6
Medhat Awad El-Hadek
Ultrasonic stress waves, generated during the dynamic impact on structures, were studied. A benchmark for the finite element analysis (FEA) was made to define the optimum geometrical factors, which were represented as, mesh distribution, analysis time, ultrasonic wave properties, element type, and shape to capture the dynamic phenomena compared to the theoretical exact solution. Comparison of three different dimensional finite element models was performed depending on the applied impact forces, the element size, and the structural geometry...
June 3, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28584518/an-investigation-into-a-gear-based-knee-joint-designed-for-lower-limb-prosthesis
#7
M S H Bhuiyan, I A Choudhury, M Dahari, Y Nukman, S Z Dawal
A gear-based knee joint is designed to improve the performance of mechanical-type above-knee prostheses. The gear set with the help of some bracing, and bracket arrangement, is used to enable the prosthesis to follow the residual limb movement. The motion analysis and finite-element analysis (FEA) of knee joint components are carried out to assess the feasibility of the design. The maximum stress of 29.74 MPa and maximum strain of 2.393e-004 are obtained in the gear, whereas the maximum displacement of 7...
2017: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/28578345/calcium-channel-opening-rather-than-the-release-of-atp-causes-the-apoptosis-of-osteoblasts-induced-by-overloaded-mechanical-stimulation
#8
Lu Liu, Hui Li, Ying Cui, Ruixin Li, Fan Meng, Zi Ye, Xizheng Zhang
BACKGROUND: Stress fracture is one of the most common overuse injuries in athletes. Overloaded mechanical stimulation is an important factor affecting stress fractures, but the mechanism is unclear. METHODS: MC3T3-E1 cells and a polycaprolactone (PCL) scaffold were co-cultured, and finite element analysis (FEA) was used to analyze the load-carrying capability. Cell proliferation was investigated with CCK-8 assays. An alkaline phosphatase (AKP) activity assay was used to evaluate cell differentiation...
June 5, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28558326/preparation-characterization-and-thermal-risk-evaluation-of-dihydroxylammonium-5-5-bistetrazole-1-1-diolate-based-polymer-bonded-explosive
#9
Hu Niu, Shusen Chen, Qinghai Shu, Lijie Li, Shaohua Jin
Dihydroxylammonium 5,5'- bistetrazole-1,1'-diolate (TKX-50) was used to prepare TKX-50-based polymer bonded explosive (PBX) for the first time in this study. The thermal stabilities and the kinetic parameters of TKX-50 and TKX-50-based PBX were compared via Differential Scanning Calorimetry (DSC), Thermal Gravity-Differential Thermal Gravity (TG-DTG) and Accelerating Rate Calorimeter (ARC). Furthermore, in order to know about their thermal safeties comprehensively, an advanced thermal analysis program based on Friedman method was employed to calculate the thermal safety parameters for TKX-50 and its PBX...
May 22, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28553957/genetic-association-study-of-exfoliation-syndrome-identifies-a-protective-rare-variant-at-loxl1-and-five-new-susceptibility-loci
#10
Tin Aung, Mineo Ozaki, Mei Chin Lee, Ursula Schlötzer-Schrehardt, Gudmar Thorleifsson, Takanori Mizoguchi, Robert P Igo, Aravind Haripriya, Susan E Williams, Yury S Astakhov, Andrew C Orr, Kathryn P Burdon, Satoko Nakano, Kazuhiko Mori, Khaled Abu-Amero, Michael Hauser, Zheng Li, Gopalakrishnan Prakadeeswari, Jessica N Cooke Bailey, Alina Popa Cherecheanu, Jae H Kang, Sarah Nelson, Ken Hayashi, Shin-Ichi Manabe, Shigeyasu Kazama, Tomasz Zarnowski, Kenji Inoue, Murat Irkec, Miguel Coca-Prados, Kazuhisa Sugiyama, Irma Järvelä, Patricio Schlottmann, S Fabian Lerner, Hasnaa Lamari, Yildirim Nilgün, Mukharram Bikbov, Ki Ho Park, Soon Cheol Cha, Kenji Yamashiro, Juan C Zenteno, Jost B Jonas, Rajesh S Kumar, Shamira A Perera, Anita S Y Chan, Nino Kobakhidze, Ronnie George, Lingam Vijaya, Tan Do, Deepak P Edward, Lourdes de Juan Marcos, Mohammad Pakravan, Sasan Moghimi, Ryuichi Ideta, Daniella Bach-Holm, Per Kappelgaard, Barbara Wirostko, Samuel Thomas, Daniel Gaston, Karen Bedard, Wenda L Greer, Zhenglin Yang, Xueyi Chen, Lulin Huang, Jinghong Sang, Hongyan Jia, Liyun Jia, Chunyan Qiao, Hui Zhang, Xuyang Liu, Bowen Zhao, Ya-Xing Wang, Liang Xu, Stéphanie Leruez, Pascal Reynier, George Chichua, Sergo Tabagari, Steffen Uebe, Matthias Zenkel, Daniel Berner, Georg Mossböck, Nicole Weisschuh, Ursula Hoja, Ulrich-Christoph Welge-Luessen, Christian Mardin, Panayiota Founti, Anthi Chatzikyriakidou, Theofanis Pappas, Eleftherios Anastasopoulos, Alexandros Lambropoulos, Arkasubhra Ghosh, Rohit Shetty, Natalia Porporato, Vijayan Saravanan, Rengaraj Venkatesh, Chandrashekaran Shivkumar, Narendran Kalpana, Sripriya Sarangapani, Mozhgan R Kanavi, Afsaneh Naderi Beni, Shahin Yazdani, Alireza Lashay, Homa Naderifar, Nassim Khatibi, Antonio Fea, Carlo Lavia, Laura Dallorto, Teresa Rolle, Paolo Frezzotti, Daniela Paoli, Erika Salvi, Paolo Manunta, Yosai Mori, Kazunori Miyata, Tomomi Higashide, Etsuo Chihara, Satoshi Ishiko, Akitoshi Yoshida, Masahide Yanagi, Yoshiaki Kiuchi, Tsutomu Ohashi, Toshiya Sakurai, Takako Sugimoto, Hideki Chuman, Makoto Aihara, Masaru Inatani, Masahiro Miyake, Norimoto Gotoh, Fumihiko Matsuda, Nagahisa Yoshimura, Yoko Ikeda, Morio Ueno, Chie Sotozono, Jin Wook Jeoung, Min Sagong, Kyu Hyung Park, Jeeyun Ahn, Marisa Cruz-Aguilar, Sidi M Ezzouhairi, Abderrahman Rafei, Yaan Fun Chong, Xiao Yu Ng, Shuang Ru Goh, Yueming Chen, Victor H K Yong, Muhammad Imran Khan, Olusola O Olawoye, Adeyinka O Ashaye, Idakwo Ugbede, Adeola Onakoya, Nkiru Kizor-Akaraiwe, Chaiwat Teekhasaenee, Yanin Suwan, Wasu Supakontanasan, Suhanya Okeke, Nkechi J Uche, Ifeoma Asimadu, Humaira Ayub, Farah Akhtar, Ewa Kosior-Jarecka, Urszula Lukasik, Ignacio Lischinsky, Vania Castro, Rodolfo Perez Grossmann, Gordana Sunaric Megevand, Sylvain Roy, Edward Dervan, Eoin Silke, Aparna Rao, Priti Sahay, Pablo Fornero, Osvaldo Cuello, Delia Sivori, Tamara Zompa, Richard A Mills, Emmanuelle Souzeau, Paul Mitchell, Jie Jin Wang, Alex W Hewitt, Michael Coote, Jonathan G Crowston, Sergei Y Astakhov, Eugeny L Akopov, Anton Emelyanov, Vera Vysochinskaya, Gyulli Kazakbaeva, Rinat Fayzrakhmanov, Saleh A Al-Obeidan, Ohoud Owaidhah, Leyla Ali Aljasim, Balram Chowbay, Jia Nee Foo, Raphael Q Soh, Kar Seng Sim, Zhicheng Xie, Augustine W O Cheong, Shi Qi Mok, Hui Meng Soo, Xiao Yin Chen, Su Qin Peh, Khai Koon Heng, Rahat Husain, Su-Ling Ho, Axel M Hillmer, Ching-Yu Cheng, Francisco A Escudero-Domínguez, Rogelio González-Sarmiento, Frederico Martinon-Torres, Antonio Salas, Kessara Pathanapitoon, Linda Hansapinyo, Boonsong Wanichwecharugruang, Naris Kitnarong, Anavaj Sakuntabhai, Hip X Nguyn, Giang T T Nguyn, Trình V Nguyn, Werner Zenz, Alexander Binder, Daniela S Klobassa, Martin L Hibberd, Sonia Davila, Stefan Herms, Markus M Nöthen, Susanne Moebus, Robyn M Rautenbach, Ari Ziskind, Trevor R Carmichael, Michele Ramsay, Lydia Álvarez, Montserrat García, Héctor González-Iglesias, Pedro P Rodríguez-Calvo, Luis Fernández-Vega Cueto, Çilingir Oguz, Nevbahar Tamcelik, Eray Atalay, Bilge Batu, Dilek Aktas, Burcu Kasım, M Roy Wilson, Anne L Coleman, Yutao Liu, Pratap Challa, Leon Herndon, Rachel W Kuchtey, John Kuchtey, Karen Curtin, Craig J Chaya, Alan Crandall, Linda M Zangwill, Tien Yin Wong, Masakazu Nakano, Shigeru Kinoshita, Anneke I den Hollander, Eija Vesti, John H Fingert, Richard K Lee, Arthur J Sit, Bradford J Shingleton, Ningli Wang, Daniele Cusi, Raheel Qamar, Peter Kraft, Margaret A Pericak-Vance, Soumya Raychaudhuri, Steffen Heegaard, Tero Kivelä, André Reis, Friedrich E Kruse, Robert N Weinreb, Louis R Pasquale, Jonathan L Haines, Unnur Thorsteinsdottir, Fridbert Jonasson, R Rand Allingham, Dan Milea, Robert Ritch, Toshiaki Kubota, Kei Tashiro, Eranga N Vithana, Shazia Micheal, Fotis Topouzis, Jamie E Craig, Michael Dubina, Periasamy Sundaresan, Kari Stefansson, Janey L Wiggs, Francesca Pasutto, Chiea Chuen Khor
Exfoliation syndrome (XFS) is the most common known risk factor for secondary glaucoma and a major cause of blindness worldwide. Variants in two genes, LOXL1 and CACNA1A, have previously been associated with XFS. To further elucidate the genetic basis of XFS, we collected a global sample of XFS cases to refine the association at LOXL1, which previously showed inconsistent results across populations, and to identify new variants associated with XFS. We identified a rare protective allele at LOXL1 (p.Phe407, odds ratio (OR) = 25, P = 2...
May 29, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28533825/in-situ-mems-testing-correlation-of-high-resolution-x-ray-diffraction-with-mechanical-experiments-and-finite-element-analysis
#11
REVIEW
Andreas Schifferle, Alex Dommann, Antonia Neels
New methods are needed in microsystems technology for evaluating microelectromechanical systems (MEMS) because of their reduced size. The assessment and characterization of mechanical and structural relations of MEMS are essential to assure the long-term functioning of devices, and have a significant impact on design and fabrication. Within this study a concept for the investigation of mechanically loaded MEMS materials on an atomic level is introduced, combining high-resolution X-ray diffraction (HRXRD) measurements with finite element analysis (FEA) and mechanical testing...
2017: Science and Technology of Advanced Materials
https://www.readbyqxmd.com/read/28527188/optimum-pure-intrusion-of-a-mandibular-canine-with-the-segmented-arch-in-lingual-orthodontics
#12
Abhishek M Thote, Krishna Sharma, Rashmi V Uddanwadiker, Sunita Shrivastava
BACKGROUND: Approximately 50% patients with a deep bite possess anatomically extruded mandibular canines. OBJECTIVE: The objective of this study was to specify an optimum toe (Θ) of the vertical segment of a cantilever from the distal aspect to achieve pure intrusion of a mandibular canine with the segmented arch in lingual orthodontics (LiO). METHODS: The geometrical model of a mandibular canine was developed to compute the required values of Θ (positive values - toe-in, negative values - toe-out)...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28476576/non-bmd-dxa-measurements-of-the-hip
#13
Clinten P Edmondson, Elliott N Schwartz
Hip fracture is one of the most serious complications of osteoporosis. More than 50% of hip and other fractures occur in patients without densitometric osteoporosis. Therefore, areal bone mineral density (aBMD) may not be the best way to assess fracture risk. In order to improve assessment of fracture risk, many other approaches have been taken. At the present time, the Fracture Risk Algorithm (FRAX©) is one of the most notable ways to improve assessment of fracture risk. However, since early in the initiation of the dual energy x-ray absorptiometry (DXA) era, several non-BMD DXA approaches to the assessment of hip fracture risk have been proposed...
May 2, 2017: Bone
https://www.readbyqxmd.com/read/28475933/surgical-implications-and-variability-in-the-use-of-the-flat-epithelial-atypia-diagnosis-on-breast-biopsy-specimens
#14
Laura S Samples, Mara H Rendi, Paul D Frederick, Kimberly H Allison, Heidi D Nelson, Thomas R Morgan, Donald L Weaver, Joann G Elmore
OBJECTIVES: Flat epithelial atypia (FEA) is a relatively new diagnostic term with uncertain clinical significance for surgical management. Any implied risk of invasive breast cancer associated with FEA is contingent upon diagnostic reproducibility, yet little is known regarding its use. MATERIALS AND METHODS: Pathologists in the Breast Pathology Study interpreted one of four 60-case test sets, one slide per case, constructed from 240 breast biopsy specimens. An electronic data form with standardized diagnostic categories was used; participants were instructed to indicate all diagnoses present...
May 3, 2017: Breast: Official Journal of the European Society of Mastology
https://www.readbyqxmd.com/read/28467256/stress-strain-analysis-of-premolars-with-non-carious-cervical-lesions-influence-of-restorative-material-loading-direction-and-mechanical-fatigue
#15
A C Machado, C J Soares, B R Reis, A A Bicalho, Lha Raposo, P V Soares
Noncarious cervical lesions (NCCLs) are characterized by a loss of dental structure at the cementoenamel junction (CEJ) caused by stress, biocorrosion, and attrition. Variations in occlusal loading can promote different stress and strain patterns on the CEJ. Restoration of NCCLs is part of lesion management; however, there is still no conclusive restorative protocol for NCCLs. This study aimed to evaluate the stress and strain distribution of maxillary premolars with NCCLs according to three factors: 1) restorative technique; 2) direction of occlusal loading; and 3) mechanical fatigue...
May 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28464946/evaluating-the-biomechanical-effects-of-implant-diameter-in-case-of-facial-trauma-to-an-edentulous-atrophic-mandible-a-3d-finite-element-analysis
#16
Aysa Ayali, Kani Bilginaylar
BACKGROUND: Rehabilitation using an implant supported overdenture with two implants inserted in the interforaminal region is the easiest and currently accepted treatment modality to increase prosthetic stabilization and patient satisfaction in edentulous patients. The insertion of implants to the weakend mandibular bone decreases the strength of the bone and may lead to fractures either during or after implant placement. The aim of this three dimensional finite element analysis (3D FEA) study was to evaluate the biomechanical effects of implant diameter in case of facial trauma (2000 N) to an edentulous atrophic mandible with two implant supported overdenture...
May 2, 2017: Head & Face Medicine
https://www.readbyqxmd.com/read/28460543/biomechanical-evaluation-of-the-natural-abutment-teeth-in-combined-tooth-implant-supported-telescopic-prostheses-a-three-dimensional-finite-element-analysis
#17
Yu Chen, Chao Wang, Yuanding Huang, Tianming Feng, Huawei Zou, Yubo Fan
Telescopic overdentures supported by the combination of natural teeth and implants have been thought a valuable treatment for the severely compromised partially edentulous patients. But the combination of teeth and implants involves highly complex biomechanical problems. This study is to evaluate biomechanical behaviors of the natural abutment teeth with the treatment of combined tooth-implant supported telescopic crown prostheses in mandible through 3D FEA. According to this study, the prosthetic option supported by a combination of teeth and implants and retained by double crowns could protect teeth and their periodontal support tissues acting as a rigid splint, and may be a valuable treatment option for partially edentulous patients with severely reduced remaining teeth in mandible...
May 1, 2017: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/28457593/a-review-of-cutting-mechanics-and-modeling-techniques-for-biological-materials
#18
REVIEW
Behrouz Takabi, Bruce L Tai
This paper presents a comprehensive survey on the modeling of tissue cutting, including both soft tissue and bone cutting processes. In order to achieve higher accuracy in tissue cutting, as a critical process in surgical operations, the meticulous modeling of such processes is important in particular for surgical tool development and analysis. This review paper is focused on the mechanical concepts and modeling techniques utilized to simulate tissue cutting such as cutting forces and chip morphology. These models are presented in two major categories, namely soft tissue cutting and bone cutting...
April 27, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28452766/finite-element-modelling-of-multilayer-x-ray-optics
#19
Xianchao Cheng, Lin Zhang
Multilayer optical elements for hard X-rays are an attractive alternative to crystals whenever high photon flux and moderate energy resolution are required. Prediction of the temperature, strain and stress distribution in the multilayer optics is essential in designing the cooling scheme and optimizing geometrical parameters for multilayer optics. The finite-element analysis (FEA) model of the multilayer optics is a well established tool for doing so. Multilayers used in X-ray optics typically consist of hundreds of periods of two types of materials...
May 1, 2017: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/28441022/low-valent-lead-hydride-and-its-extreme-low-field-1-h-nmr-chemical-shift
#20
Julia Schneider, Christian P Sindlinger, Klaus Eichele, Hartmut Schubert, Lars Wesemann
Although hydrides of the group 14 elements are well-known as versatile starting materials in many chemical transformations, a hydride of lead in oxidation state II is so far unknown. In this work, we finally complete the jigsaw puzzle by reporting the isolation of the first low valent organolead hydride. The thermolabile dimeric organolead hydride was synthesized at low temperature and features a hydride (1)H NMR signal (in solution 35.61 ppm; in the solid state 31.1 ppm) at the lowest field observed so far for a diamagnetic compound in agreement with quantum chemical predictions...
May 4, 2017: Journal of the American Chemical Society
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