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https://www.readbyqxmd.com/read/29471557/prospective-comparison-of-a-metal-free-ceramic-total-knee-arthroplasty-with-an-identical-metal-system
#1
Klemens Trieb, David Ullmann, Katharina Metzinger, Reinhard Kramar, Andreas Mauerer, Stefan Hofstätter, Rainer Fiala
AIMS: The aim of this open-label, prospective, short-term study was to carry out an initial comparison of a completely metal-free ceramic with a geometrically identical metallic arthroplasty over a 1-year follow-up period. METHODS: This study investigates a completely metal-free system using a composite matrix material containing aluminum oxide (Al2 O3 , BPK-S Integration, Peter Brehm GmbH, Weisendorf, Germany) or zirconium oxide (ZrO2 , BPK-S Integration Ceramic, Biolox Delta-CeramTec GmbH, Plochingen, Germany)...
February 2018: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/29457596/evaluation-of-osteoinductive-calcium-phosphate-ceramics-repairing-alveolar-cleft-defects-in-dog-model
#2
Jinfeng Yao, Haodong Chen, Qi Gao, Zhigang Liang
BACKGROUND: Alveolar cleft repair is an important step in the sequence of treatments for cleft lip and palate. Intrinsically osteoinductive materials have been the subject of research interest. OBJECTIVE: The aim of this study was to explore the use of osteoinductive biphasic calcium phosphate (BCP) ceramics to repair alveolar cleft defects in dogs. METHODS: We prepared two kinds of BCP ceramic with different physical characteristics: osteoinductive BCP (OBCP) and non-osteoinductive BCP (NBCP)...
2018: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/29457311/bicuspid-axial-wall-height-effect-on-cad-cam-crown-fracture-mode-on-preparations-containing-advanced-total-occlusal-convergence
#3
Matthew Miller, Nicholas DuVall, John Brewster, Michael N Wajdowicz, Ashley Harris, Howard W Roberts
PURPOSE: To evaluate bicuspid axial wall height effect on the fracture mode of adhesively luted, all-ceramic CAD/CAM crowns with a 20° total occlusal convergence (TOC). MATERIALS AND METHODS: Recently extracted premolars were randomly divided into 4 groups (n = 12) with all-ceramic crown preparations accomplished using a high-speed handpiece inserted into a milling device. Specimens were prepared containing occlusogingival axial wall heights of 3, 2, and 1 mm as well as a group containing a flat preparation surface with no axial wall height...
February 18, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29454279/bonding-of-composite-cements-to-zirconia-a-systematic-review-and-meta-analysis-of-in-vitro-studies
#4
REVIEW
Putsadeeporn Thammajaruk, Masanao Inokoshi, Shanley Chong, Massimiliano Guazzato
OBJECTIVES: The aim of this study was to systematically review the literature and statistically analyze bond strength data to identify the influence that composite cements, type of test methodology, chemical and mechanical pre-treatments have on the bond strength of composite cements to zirconia in three different artificial aging conditions. METHODS: The literature was electronically searched in MEDLINE, PUBMED, EMBASE, and SCOPUS to select relevant articles that evaluated the bond strength between zirconia and composite cements...
February 8, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29448629/synthesis-and-characterization-of-calcium-phosphate-ceramic-poly-vinyl-alcohol-polycaprolactone-bilayer-nanocomposites-a-bone-tissue-regeneration-scaffold
#5
S Uma Maheshwari, K Govindan, M Raja, A Raja, M B S Pravin, S Vasanth Kumar
β Tricalcium phosphate ceramic was used to reinforce nanofibers in composite mats produced via electrospinning of poly(vinyl alcohol) (PVA), polycaprolactone (PCL) and (PVA: PCL) bilayers. The role of TCP ceramic on morphology of nanocomposites, crystalline structure, functional groups and thermal behaviour of nanocomposites were characterized by SEM, EDAX, XRD, FTIR and DSC analysis. Ultrathin cross-sections of the obtained nanocomposites were morphologically investigated with SEM and all fabricated composites consisted of fibers with average fiber diameter (AFD) around 100 nm except PCL-TCP fibers having AFD in the range of 608 nm...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448572/dc-magnetron-sputtered-izto-thin-films-for-organic-photovoltaic-application
#6
Hye Ji Lee, Imas Noviyana, Maryane Putri, Chang Young Koo, Jung-A Lee, Jeong-Joo Kim, Youngjun Jeong, Youngu Lee, Hee Young Lee
IZTO20 (In0.6Zn0.2Sn0.2O1.5) ceramic target was prepared from oxide mixture of In2O3, ZnO, and SnO2 powders. IZTO20 thin films were then deposited onto glass substrate at 400 °C by DC magnetron sputtering. The average optical transmittance determined by ultraviolet-visible spectroscopy was higher than 85% for all films. The minimum resistivity of the annealed IZTO20 thin film was approximately 6.1×10-4 Ω·cm, which tended to increase with decreasing indium content. Substrate heating and annealing were found to be important parameters affecting the electrical and optical properties...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29447309/single-tooth-replacement-using-dental-implants-supporting-all-ceramic-and-metal-based-reconstructions-results-at-18-months-of-loading
#7
Adrian Bösch, Ronald Ernst Jung, Irena Sailer, Benic Goran, Christoph Hans Hämmerle, Daniel Stefan Thoma
The aim of this study was to compare customized zirconia and titanium abutments with respect to survival rates and technical, biologic, and esthetic outcomes. A total of 28 patients with single implants were randomly assigned to 12 customized zirconia (test, AC) and 16 customized titanium (control, MC) abutments. Technical, biologic, and esthetic outcomes were assessed after a mean follow-up time of 18 months. No biologic complications were observed, and no statistical difference for the bone-to-implant distance was found at 18 months (AC -0...
March 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29445947/bone-graft-materials-for-posterolateral-fusion-made-simple-a-systematic-review
#8
REVIEW
Matthew T Morris, Sandip P Tarpada, Woojin Cho
BACKGROUND: Iliac crest has long been the gold standard for lumbar fusion, but concerns over donor site morbidity have led to a wide variety of bone graft substitutes. Despite prolific research, a general consensus is yet to be reached on bone graft materials that lead to optimal fusion. PURPOSE: The purpose of this review is to evaluate the current literature for bone graft material options that maximize fusion rate in posterolateral lumbar fusion surgery. DESIGN: Systematic Review...
February 14, 2018: European Spine Journal
https://www.readbyqxmd.com/read/29442627/studies-on-mechanical-biocompatibility-and-antibacterial-activity-of-plasma-sprayed-nano-micron-ceramic-bilayered-coatings-on-ti-6al-4v-alloy-for-biomedical-application
#9
Suganthan Veerachamy, Pearlin Hameed, Dwaipayan Sen, Sitaram Dash, Geetha Manivasagam
Ceramic oxides such as alumina and zirconia are used to fabricate dental and orthopedic implants. However, their usage is limited as they fail due to low fracture toughness. To overcome this issue, ceramic coatings on metallic implants is attempted to have a combined effect of ceramics and metallic materials. This paper reports on the microstructure, phase analysis, mechanical properties, osseointegration and antibacterial activity of three different wear-resistant coatings developed on Ti-6Al-4V alloy which is used widely as orthopedic and dental implants...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29437054/the-effect-of-bearing-surface-on-risk-of-periprosthetic-joint-infection-in-total-hip-arthroplasty-a-systematic-review-and-meta-analysis
#10
REVIEW
A T Hexter, S M Hislop, G W Blunn, A D Liddle
AIMS: Periprosthetic joint infection (PJI) is a serious complication of total hip arthroplasty (THA). Different bearing surface materials have different surface properties and it has been suggested that the choice of bearing surface may influence the risk of PJI after THA. The objective of this meta-analysis was to compare the rate of PJI between metal-on-polyethylene (MoP), ceramic-on-polyethylene (CoP), and ceramic-on-ceramic (CoC) bearings. PATIENTS AND METHODS: Electronic databases (Medline, Embase, Cochrane library, Web of Science, and Cumulative Index of Nursing and Allied Health Literature) were searched for comparative randomized and observational studies that reported the incidence of PJI for different bearing surfaces...
February 2018: Bone & Joint Journal
https://www.readbyqxmd.com/read/29436570/the-effects-of-irradiance-and-exposure-time-on-the-surface-roughness-of-bulk-fill-composite-resin-restorative-materials
#11
Fahad I Alkhudhairy
To evaluate the surface roughness of 4 different bulk-fill resin-based composites cured using different irradiance levels. Methods: This in vitro study was performed in February 2017 to August 2017 at the College of Dentistry, King Saud University. Twenty-four specimens were prepared from each of the bulk-fill materials [Tetric N-Ceram (TNC), SonicFill (SF), Smart Dentin Replacement (SDR), and Filtek Bulk-Fill (FB)] using a brass metal mold, resulting in a total of 96 specimens, cured using a Bluephase N light curing unit...
February 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29432984/high-strength-biodegradable-and-cytocompatible-alpha-tricalcium-phosphate-iron-composites-for-temporal-reduction-of-bone-fractures
#12
E B Montufar, M Casas-Luna, M Horynová, S Tkachenko, Z Fohlerová, S Diaz-de-la-Torre, K Dvorak, L Celko, J Kaiser
In this work alpha tricalcium phosphate (α-TCP)/ iron (Fe) composites were developed as a new family of biodegradable, load-bearing and cytocompatible materials. The composites with composition from pure ceramic to pure metallic samples were consolidated by pulsed electric current assisted sintering to minimise processing time and temperature while improving their mechanical performance. The mechanical strength of the composites was increased and controlled with the Fe content, passing from brittle to ductile failure...
February 9, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29432651/a-20-year-historical-prospective-cohort-study-of-root-canal-treatments-a-multilevel-analysis
#13
C Prati, C Pirani, F Zamparini, M R Gatto, M G Gandolfi
AIM: To evaluate the number of healthy and functional root filled teeth of patients included in a recall program for at least 20 years. METHODOLOGY: Teeth were root filled by a single specialist following manual canal instrumentation, lateral/vertical compaction of gutta-percha and restored with glass-ionomer cements and bonding system/composite resin. In a large percentage of teeth a metal-ceramic crown was positioned during follow-up. Patients included in the recall program (n=130) were blindly assessed both clinically and radiographically (every 2 years) to evaluate clinical symptoms and periapical status (PAI)...
February 12, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29430815/microscopic-study-on-the-concretion-of-ceramics-in-the-nanhai-i-shipwreck-of-china-southern-song-dynasty-1-127-1-279-a-d
#14
Xi-Luo Hao, Tie-Quan Zhu, Jin-Jin Xu, Yan-Rong Wang, Xuan-Wei Zhang
"Nanhai I" shipwreck of China Southern Song Dynasty is the oldest and the most integrally preserved shipwreck in the world. The related conservation and archeological research have caught great attention of different experts all over the world. In this study, different types of concretion covered on the surface of the ceramics in "Nanhai I" shipwreck were analyzed by X-ray diffractometer, micro-Raman spectrometer, and scanning electron microscope equipped with energy dispersive spectroscopy. Based on the analyses, we found that the grey concretion was mainly composed of quartz, aragonite, and calcite while the reddish concretion was mainly composed of pyrite and quartz...
February 12, 2018: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29427066/ion-neutral-clustering-of-bile-acids-in-electrospray-ionization-across-uplc-flow-regimes
#15
Patrick Brophy, Corey D Broeckling, James Murphy, Jessica E Prenni
Bile acid authentic standards were used as model compounds to quantitatively evaluate complex in-source phenomenon on a UPLC-ESI-TOF-MS operated in the negative mode. Three different diameter columns and a ceramic-based microfluidic separation device were utilized, allowing for detailed descriptions of bile acid behavior across a wide range of flow regimes and instantaneous concentrations. A custom processing algorithm based on correlation analysis was developed to group together all ion signals arising from a single compound; these grouped signals produce verified compound spectra for each bile acid at each on-column mass loading...
February 9, 2018: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/29426786/effect-of-feldspathic-porcelain-layering-on-the-marginal-fit-of-zirconia-and-titanium-complete-arch-fixed-implant-supported-frameworks
#16
Burak Yilmaz, Faris A Alshahrani, Ediz Kale, William M Johnston
STATEMENT OF PROBLEM: Veneering with porcelain may adversely affect the marginal fit of long-span computer-aided design and computer-aided manufacturing (CAD-CAM) implant-supported fixed prostheses. Moreover, data regarding the precision of fit of CAD-CAM-fabricated implant-supported complete zirconia fixed dental prostheses (FDPs) before and after porcelain layering are limited. PURPOSE: The purpose of this in vitro study was to evaluate the effect of porcelain layering on the marginal fit of CAD-CAM-fabricated complete-arch implant-supported, screw-retained FDPs with presintered zirconia frameworks compared with titanium...
February 6, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29422462/assessment-of-retention-and-resistance-form-of-tooth-preparations-for-all-ceramic-restorations-using-digital-imaging-technique
#17
Alex M Muruppel, Joyce Thomas, Sudeep Saratchandran, Dinesh Nair, Sheeba Gladstone, Milen M Rajeev
AIM: This in vitro study evaluated the resistance form of die preparations for all ceramic restorations and, thereby, explored the concept of effective taper and its correlation between the ideal in theory and actual in the clinical situation by analyzing the digital images of the die preparations. MATERIALS AND METHODS: Scanned digital images of 114 die preparations for all ceramic restorations (n = 114) were collected from a dental laboratory. All the images were also analyzed digitally using Adobe Photoshop® software to analyze the degree of taper (angle of convergence) of each preparation and then applied the Zuckerman's circle, and the Lewis perpendicular methods were used to measure the resistance form...
February 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29420309/a-versatile-three-dimensional-foam-fabrication-strategy-for-soft-and-hard-tissue-engineering
#18
Changlu Xu, Yanjie Bai, Shaofeng Yang, Huilin Yang, David A Stout, Phong A Tran, Lei Yang
The fabrication strategies of three-dimensional porous biomaterials have been extensively studied and well established in the past few decades, yet the biocompatibility and versatility of porous architecture preparation is still lacking. Herewith, we present a novel and green 3D porous foam fabrication technique for both soft and hard engineering. By utilizing the gelatinization and retrogradation properties of starches, stabilized porous constructs made of various building blocks, from living cells to ceramic particles, were created for the first time...
February 8, 2018: Biomedical Materials
https://www.readbyqxmd.com/read/29414841/structure-and-infrared-emissivity-properties-of-the-mao-coatings-formed-on-tc4-alloys-in-k%C3%A2-zrf%C3%A2-based-solution
#19
Guangrui Gao, Ying Li, Dan Hu, Zhengping Xi
Micro-arc oxidation (MAO) ceramic coatings were formed on TC4 alloy surface in silicate and metaphosphate electrolytes based with K₂ZrF₆ for various concentrations. X-ray diffraction (XRD), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) were used to characterize the phase composition, microstructure and chemical compositions of the coatings. The infrared emissivity of the coatings was measured at 50 °C in a wavelength range of 8-20 µm. The microstructural observations all revealed the typical porousstructures...
February 7, 2018: Materials
https://www.readbyqxmd.com/read/29414476/fracture-free-surfaces-of-cad-cam-lithium-metasilicate-glass-ceramic-using-micro-slurry-jet-erosion
#20
Ling Yin, Takashi Baba, Yoshitaka Nakanishi
This paper reports the use of micro-slurry jet erosion (MSJE) on CAD/CAM lithium mesilicate glass ceramic (LMGC) that is capable of achieving the fracture-free surface quality. A computer-controlled MSJE process using a low-pressure and low-concentration alumina slurry was applied to diamond-ground LMGC surfaces with surface and subsurface damage. The MSJE processed and diamond-ground LMGC surfaces were examined using scanning electron microscopy (SEM) to examine surface morphology, fractures, and residual defects...
January 29, 2018: Journal of the Mechanical Behavior of Biomedical Materials
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