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https://www.readbyqxmd.com/read/28813019/grafting-modification-of-the-reactive-core-shell-particles-to-enhance-the-toughening-ability-of-polylactide
#1
Zhaokun Li, Shixin Song, Xuanchen Zhao, Xue Lv, Shulin Sun
In order to overcome the brittleness of polylactide (PLA), reactive core-shell particles (RCS) with polybutadiene as core and methyl methacrylate-co-styrene-co-glycidyl methacrylate as shell were prepared to toughen PLA. Tert-dodecyl mercaptan (TDDM) was used as chain transfer agent to modify the grafting properties (such as grafting degree, shell thickness, internal and external grafting) of the core-shell particles. The introduction of TDDM decreased the grafting degree, shell thickness and the Tg of the core phase...
August 16, 2017: Materials
https://www.readbyqxmd.com/read/28774087/zrb%C3%A2-cnts-nanocomposites-fabricated-by-spark-plasma-sintering
#2
Hua Jin, Songhe Meng, Weihua Xie, Chenghai Xu, Jiahong Niu
ZrB₂-based nanocomposites with and without carbon nanotubes (CNTs) as reinforcement were prepared at 1600 °C by spark plasma sintering. The effects of CNTs on the microstructure and mechanical properties of nano-ZrB₂ matrix composites were studied. The results indicated that adding CNTs can inhibit the abnormal grain growth of ZrB₂ grains and improve the fracture toughness of the composites. The toughness mechanisms were crack deflection, crack bridging, debonding, and pull-out of CNTs. The experimental results of the nanograined ZrB₂-CNTs composites were compared with those of the micro-grained ZrB₂-CNTs composites...
November 29, 2016: Materials
https://www.readbyqxmd.com/read/28773966/comparisons-of-damage-evolution-between-2d-c-sic-and-sic-sic-ceramic-matrix-composites-under-tension-tension-cyclic-fatigue-loading-at-room-and-elevated-temperatures
#3
Longbiao Li
In this paper, comparisons of damage evolution between 2D C/SiC and SiC/SiC ceramic-matrix composites (CMCs) under tension-tension cyclic fatigue loading at room and elevated temperatures have been investigated. Fatigue hysteresis loops models considering multiple matrix cracking modes in 2D CMCs have been developed based on the damage mechanism of fiber sliding relative to the matrix in the interface debonded region. The relationships between the fatigue hysteresis loops, fatigue hysteresis dissipated energy, fatigue peak stress, matrix multiple cracking modes, and interface shear stress have been established...
October 19, 2016: Materials
https://www.readbyqxmd.com/read/28773136/fracture-toughness-and-elastic-modulus-of-epoxy-based-nanocomposites-with-dopamine-modified-nano-fillers
#4
Kwang Liang Koh, Xianbai Ji, Aravind Dasari, Xuehong Lu, Soo Khim Lau, Zhong Chen
This paper examines the effect of surface treatment and filler shape factor on the fracture toughness and elastic modulus of epoxy-based nanocomposite. Two forms of nanofillers, polydopamine-coated montmorillonite clay (D-clay) and polydopamine-coated carbon nanofibres (D-CNF) were investigated. It was found that Young's modulus increases with increasing D-clay and D-CNF loading. However, the fracture toughness decreases with increased D-clay loading but increases with increased D-CNF loading. Explanations have been provided with the aid of fractographic analysis using electron microscope observations of the crack-filler interactions...
July 10, 2017: Materials
https://www.readbyqxmd.com/read/28773098/finite-element-analysis-of-interfacial-debonding-in-copper-diamond-composites-for-thermal-management-applications
#5
Muhammad Zain-Ul-Abdein, Hassan Ijaz, Waqas Saleem, Kabeer Raza, Abdullah Salmeen Bin Mahfouz, Tarek Mabrouki
Copper/diamond (Cu/D) composites are famous in thermal management applications for their high thermal conductivity values. They, however, offer some interface related problems like high thermal boundary resistance and excessive debonding. This paper investigates interfacial debonding in Cu/D composites subjected to steady-state and transient thermal cyclic loading. A micro-scale finite element (FE) model was developed from a SEM image of the Cu/20 vol % D composite sample. Several test cases were assumed with respect to the direction of heat flow and the boundary interactions between Cu/uncoated diamonds and Cu/Cr-coated diamonds...
July 2, 2017: Materials
https://www.readbyqxmd.com/read/28773024/mechanical-behavior-of-steel-fiber-reinforced-concrete-beams-bonded-with-external-carbon-fiber-sheets
#6
Viktor Gribniak, Vytautas Tamulenas, Pui-Lam Ng, Aleksandr K Arnautov, Eugenijus Gudonis, Ieva Misiunaite
This study investigates the mechanical behavior of steel fiber-reinforced concrete (SFRC) beams internally reinforced with steel bars and externally bonded with carbon fiber-reinforced polymer (CFRP) sheets fixed by adhesive and hybrid jointing techniques. In particular, attention is paid to the load resistance and failure modes of composite beams. The steel fibers were used to avoiding the rip-off failure of the concrete cover. The CFRP sheets were fixed to the concrete surface by epoxy adhesive as well as combined with various configurations of small-diameter steel pins for mechanical fastening to form a hybrid connection...
June 17, 2017: Materials
https://www.readbyqxmd.com/read/28772945/crack-extension-and-possibility-of-debonding-in-encapsulation-based-self-healing-materials
#7
Wenting Li, Zhengwu Jiang, Zhenghong Yang
The breakage of capsules upon crack propagation is crucial for achieving crack healing in encapsulation-based self-healing materials. A mesomechanical model was developed in this study to simulate the process of crack propagation in a matrix and the potential of debonding. The model used the extended finite element method (XFEM) combined with a cohesive zone model (CZM) in a two-dimensional (2D) configuration. The configuration consisted of an infinite matrix with an embedded crack and a capsule nearby, all subjected to a uniaxial remote tensile load...
May 27, 2017: Materials
https://www.readbyqxmd.com/read/28772544/synergistic-effects-of-stress-rupture-and-cyclic-loading-on-strain-response-of-fiber-reinforced-ceramic-matrix-composites-at-elevated-temperature-in-oxidizing-atmosphere
#8
Longbiao Li
In this paper, the synergistic effects of stress rupture and cyclic loading on the strain response of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperature in air have been investigated. The stress-strain relationships considering interface wear and interface oxidation in the interface debonded region under stress rupture and cyclic loading have been developed to establish the relationship between the peak strain, the interface debonded length, the interface oxidation length and the interface slip lengths...
February 15, 2017: Materials
https://www.readbyqxmd.com/read/28750109/comparison-of-fixed-dental-prostheses-with-zirconia-and-metal-frameworks-five-year-results-of-a-randomized-controlled-clinical-trial
#9
Irena Sailer, Marc Balmer, Hüsler Jürg, Christoph Hans Franz Hämmerle, Sarah Känel, Daniel Stefan Thoma
PURPOSE: The aim of this study was to test whether posterior zirconia-ceramic (ZC) and metal-ceramic (MC) fixed dental prostheses (FDPs) exhibit similar survival and technical/biologic complication rates. MATERIALS AND METHODS: A total of 58 patients in need of 76 posterior FDPs were randomly assigned to receive 40 ZC and 36 MC FDPs. The restorations were examined at baseline (cementation) and yearly for 5 years. Technical and biologic outcomes were compared. The independent treatment groups were compared with nonparametric Mann-Whitney test for metric variables and with Fisher exact test for categoric data...
July 27, 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28749238/aesthetic-and-functional-outcomes-using-a-multiloop-edgewise-archwire-for-camouflage-orthodontic-treatment-of-a-severe-class-iii-open-bite-malocclusion
#10
Guido Artemio Marañón-Vásquez, Luciano Carlos Soldevilla Galarza, Freddy Antonio Tolentino Solis, Cliff Wilson, Fábio Lourenço Romano
Occasionally, orthodontists will be challenged to treat malocclusions and skeletal disharmonies, which by their complexity one might think that the only treatment alternative is the surgical-orthodontic approach. A male patient, aged 17 years old, was diagnosed with a skeletal Class III malocclusion, anterior open bite and negative overjet. An unpleasant profile was the patient's 'chief complaint' showing interest in facial aesthetics improvement. Nevertheless, the patient and his parents strongly preferred a non-surgical treatment approach...
July 27, 2017: Journal of Orthodontics
https://www.readbyqxmd.com/read/28740326/on-line-laser-radiation-controlled-to-the-removal-of-adhesive-on-teeth-after-bracket-debonding
#11
Clara Gómez, Juan Carlos Palma, Ángel Costela
BACKGROUND AND AIMS: After bracket debonding a correct removal of the adhesive from tooth surfaces without causing any iatrogenic damage to the enamel is needed. However, conventional techniques do not allow a selective removal process. The present article focuses on the removal of adhesive on teeth after bracket debonding by using laser radiation at 355 nm (third harmonic wavelength of a Q-switched Nd:YAG). MATERIAL AND METHODS: Brackets were bonded to 10 extracted human premolars from young patients and removed after a storage period of 2 months...
March 31, 2017: Laser Therapy
https://www.readbyqxmd.com/read/28734997/influence-of-preparation-fitting-and-cementation-on-the-vitro-performance-and-fracture-resistance-of-cad-cam-crowns
#12
Martin Rosentritt, Verena Preis, Michael Behr, Sebastian Hahnel
OBJECTIVES: To investigate debonding and stability of CAD/CAM composite crowns as a function of (a) preparation design, (b) fitting parameters of the milling process, and (c) type of cementation. METHODS: Extracted human molars were prepared providing either retentive design (R) or no retention (NR). After digitalization, full-contour crowns were milled using either optimal (OF) or reduced (RF) fitting parameters. A total of 112 crowns were milled from the composite materials Lava Ultimate (L) and Grandio Blocs (G) and a ceramic reference...
July 19, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28734190/two-dimensional-modeling-of-elastic-wave-propagation-in-solids-containing-cracks-with-rough-surfaces-and-friction-part-ii-numerical-implementation
#13
Steven Delrue, Vladislav Aleshin, Kevin Truyaert, Olivier Bou Matar, Koen Van Den Abeele
Our study aims at the creation of a numerical toolbox that describes wave propagation in samples containing internal contacts (e.g. cracks, delaminations, debondings, imperfect intergranular joints) of known geometry with postulated contact interaction laws including friction. The code consists of two entities: the contact model and the solid mechanics module. Part I of the paper concerns an in-depth description of a constitutive model for realistic contacts or cracks that takes into account the roughness of the contact faces and the associated effects of friction and hysteresis...
July 13, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28734189/two-dimensional-modeling-of-elastic-wave-propagation-in-solids-containing-cracks-with-rough-surfaces-and-friction-part-i-theoretical-background
#14
Vladislav Aleshin, Steven Delrue, Andrey Trifonov, Olivier Bou Matar, Koen Van Den Abeele
Our study aims at the creation of a numerical toolbox that describes wave propagation in samples containing internal contacts (e.g. cracks, delaminations, debondings, imperfect intergranular joints) of known geometry with postulated contact interaction laws including friction. The code consists of two entities: the contact model and the solid mechanics module. Part I of the paper concerns the modeling of internal contacts (called cracks for brevity), while part II is related to the integration of the developed contact model into a solid mechanics module that allows the description of wave propagation processes...
July 13, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28722001/enamel-color-changes-following-orthodontic-treatment
#15
REVIEW
Akshaya Pandian, Sukanya Ranganathan, Sridevi Padmanabhan
OBJECTIVE: To evaluate and compare the effect of various orthodontic bonding systems and clean up procedures on quantitative enamel colour change. MATERIALS AND METHODS: A literature search was done to identify the studies that assessed the quantitative enamel colour change associated with the various bonding systems and cleanup procedures. Electronic database (Pub Med, Cochrane and Google Scholar) were searched. First stage screening was performed and the abstracts were selected according to the initial selection criteria...
May 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/28713110/an-innovative-approach-to-retention-thermoplastic-retainer
#16
K A Adam Ozeer, Sumitha A David, Umar Mohamed, P C Sunil, Sam Paul, Parson Paul
AIM: The aim of this study was to design and introduce a retainer that overcomes the common shortcomings seen in other retainers. MATERIALS AND METHODS: Hard thermoplastic sheet of 0.5 mm thickness is vacuum or pressure-molded onto the patient cast. Lingual portion of the retainer is trimmed according to the contours of the anterior teeth. Contact points between the maxillary and mandibular anterior teeth are marked on the retainer and reduced. Punch cut holes are placed on the retainer for the exit of flash and air bubbles while fixation...
July 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28711589/fixation-strength-of-a-polyetheretherketone-femoral-component-in-total-knee-arthroplasty
#17
Lennert de Ruiter, Dennis Janssen, Adam Briscoe, Nico Verdonschot
INTRODUCTION: Introducing polyetheretherketone (PEEK) polymer as a material for femoral components in total knee arthroplasty (TKA) could potentially lead to a reduction of the cemented fixation strength. A PEEK implant is more likely to deform under high loads, rendering geometrical locking features less effective. Fixation strength may be enhanced by adding more undercuts or specific surface treatments. The aim of this study is to measure the initial fixation strength and investigate the associated failure patterns of three different iterations of PEEK-OPTIMA(®) implants compared with a Cobalt-Chromium (CoCr) component...
July 12, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28708920/complications-and-clinical-considerations-of-the-implant-retained-zirconia-complete-arch-prosthesis-with-various-opposing-dentitions
#18
Jorge Gonzalez, Robert G Triplett
PURPOSE: To evaluate the performance of the implant-retained zirconia complete-arch prosthesis with various opposing dentitions. MATERIALS AND METHODS: The 40 patients included in this retrospective case series study were treated with one or two implant-retained zirconia complete-arch prostheses (ZIRCAP) using the Zirkonzahn protocol. Prettau zirconia frames were created with strategic cutbacks in the structure to extend zirconia incisal coverage of the esthetic anterior sextants and complete monolithic zirconia in the molar areas; subsequent layers of porcelain were applied to nonfunctional and esthetic areas...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28703151/predictability-of-resin-bonded-bridges-a-systematic-review
#19
G R Balasubramaniam
Objective The objective of this systematic review is to evaluate the survival rate of resin bonded bridges (RBBs) and understand the relationship between various prognostic factors and survival rate.Methods An electronic medline and hand search were carried out to identify prospective studies on RBBs. Critical appraisal of the studies was done and data was extracted from selected studies. Survival rate was estimated with random effect Poissons regression using R software. Influence of location and luting cements was estimated using odds ratio and forest plots using CMA software...
June 9, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28689915/a-3-year-clinical-evaluation-of-endodontically-treated-posterior-teeth-restored-with-two-different-materials-using-the-cerec-ac-chair-side-system
#20
Ting Lu, Ling Peng, Fu Xiong, Xiao-Yu Lin, Ping Zhang, Zhi-Ting Lin, Bu-Ling Wu
STATEMENT OF PROBLEM: The introduction of polymer-infiltrated ceramic network (PICN) materials may provide more options for dentists in restoring short clinical crowns and extensively damaged posterior teeth, but clinical data for their performance are lacking. PURPOSE: The purpose of this clinical study was to compare the 3-year performance and survival rates of PICN material with those of conservative ceramic onlay restorations for endodontically treated posterior teeth using the CEREC AC chair-side system...
July 7, 2017: Journal of Prosthetic Dentistry
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