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https://www.readbyqxmd.com/read/27933437/focal-disruption-in-the-wall-of-the-porcelain-gallbladder-a-sign-of-gallbladder-carcinoma
#1
EDITORIAL
Mougnyan Cox, Manisha Patel, Upasana Joneja, Colette Shaw, Patrick O'Kane
No abstract text is available yet for this article.
December 8, 2016: Internal and Emergency Medicine
https://www.readbyqxmd.com/read/27927283/bond-strengths-of-porcelain-to-cobalt-chromium-alloys-made-by-casting-milling-and-selective-laser-melting
#2
Jieyin Li, Chaojie Chen, Juankun Liao, Lang Liu, Xiuhua Ye, Shiyao Lin, Jiantao Ye
STATEMENT OF PROBLEM: Cobalt-chromium (Co-Cr) alloys have been widely used for metal ceramic fixed prostheses and can be fabricated using conventionally cast or new computer-aided technology. However, the effect of different manufacturing methods on the metal-ceramic bond strength needs further evaluation. PURPOSE: The purpose of this in vitro study was to evaluate the metal-ceramic bond strength of a Co-Cr alloy made by casting, milling, and selective laser melting (SLM)...
December 4, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27892840/adhesive-cementation-promotes-higher-fatigue-resistance-to-zirconia-crowns
#3
F Campos, L F Valandro, S A Feitosa, C J Kleverlaan, A J Feilzer, N de Jager, M A Bottino
OBJECTIVE: The aim of this study was to investigate the influence of the cementation strategy on the fatigue resistance of zirconia crowns. The null hypothesis was that the cementation strategy would not affect the fatigue resistance of the crowns. METHODS AND MATERIALS: Seventy-five simplified molar tooth crown preparations were machined in glass fiber-filled epoxy resin. Zirconia crowns were designed (thickness=0.7 mm), milled by computer-aided design/computer-aided manufacturing, and sintered, as recommended...
November 28, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27890357/effect-of-cement-space-on-stress-distribution-in-y-tzp-based-crowns
#4
Carlos Eduardo Edwards Rezende, Ana Flávia Sanches Borges, Carla Castiglia Gonzaga, Yuanyuan Duan, José Henrique Rubo, Jason Alan Griggs
OBJECTIVE: To evaluate the stress distribution in bi-layered Y-TZP based crowns, according to the occlusal internal spacing between coping and abutment. METHODS: Twelve premolar shaped Y-TZP copings were made by a CAD/CAM system and seated on an abutment to evaluate the internal fit at the occlusal third using micro-CT images. Considering the fitting range obtained experimentally, two 3D finite element models, consisting on bone tissue, a titanium implant, a zirconia abutment, cement layer and a bi-layered Y-TZP ceramic crown were constructed based on the micro-CT images, one corresponding to the thinnest cement space and other representing the specimen with the thickest cement space obtained experimentally...
November 24, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27881325/influence-of-porcelain-firing-and-cementation-on-the-marginal-adaptation-of-metal-ceramic-restorations-prepared-by-different-methods
#5
Necati Kaleli, Duygu Saraç
STATEMENT OF PROBLEM: Marginal adaptation plays an important role in the survival of metal ceramic restorations. Porcelain firings and cementation may affect the adaptation of restorations. Moreover, conventional casting procedures and casting imperfections may cause deteriorations in the marginal adaptation of metal ceramic restorations. PURPOSE: The purpose of this in vitro study was to compare the marginal adaptation after fabrication of the framework, porcelain application, and cementation of metal ceramic restorations prepared by using the conventional lost-wax technique, milling, direct metal laser sintering (DMLS), and LaserCUSING, a direct process powder-bed system...
October 27, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27880011/shear-bond-strength-of-repair-systems-to-new-cad-cam-restorative-materials
#6
Özlem Üstün, Işıl Keçik Büyükhatipoğlu, Aslı Seçilmiş
PURPOSE: To evaluate the bond strength of repair systems (Ceramic Repair, Clearfil Repair) to computer-aided design/computer-assisted machining (CAD/CAM) restorative materials (IPS e.max CAD, Vita Suprinity, Vita Enamic, Lava Ultimate). MATERIALS AND METHODS: Thermally aged CAD/CAM restorative material specimens (5000 cycles between 5°C and 55°C) were randomly divided into two groups according to the repair system: Ceramic Repair (37% phosphoric acid + Monobond-S + Heliobond + Tetric N Ceram) or Clearfil Repair (40% phosphoric acid + mixture of Clearfil Porcelain Bond Activator and Clearfil SE Bond Primer + Clearfil SE Bond + Filtek Z250)...
November 23, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27866055/microstructure-and-nanoindentation-analyses-of-low-temperature-aging-on-the-zirconia-porcelain-interface
#7
M D Peng, J Q Wei, Y N Wang, Q Li
The aim of the present study was to investigate the effects of low-temperature aging on the micro-mechanical and micro-structural properties of zirconia-porcelain interface. In total, thirty-three Y-TZP zirconia blocks were fabricated by using CAD/CAM technology, veneered with porcelains. Specimens were submitted to low-temperature aging in an autoclave at 134°C, additional 0.2MPa pressure for 0h, 5h, or 10h. Flexural strength was obtained by using three-point bending test. Micro-mechanical properties (nano-hardness (H) and reduced modulus (Er)) were investigated by nanoindentation tests...
November 11, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27860023/evaluation-of-a-novel-computer-color-matching-system-based-on-the-improved-back-propagation-neural-network-model
#8
Jiaqiang Wei, Mengdong Peng, Qing Li, Yining Wang
PURPOSE: To explore the feasibility of a novel computer color-matching (CCM) system based on the improved back-propagation neural network (BPNN) model by comparing it with the traditional visual method. MATERIAL AND METHODS: Forty-three metal-ceramic specimens were fabricated by proportionally mixing porcelain powders. Thirty-nine specimens were randomly selected to train the BPNN model, while the remaining four specimens were used to test and calibrate the model...
November 9, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27829759/an-in-vitro-study-to-evaluate-the-difference-in-shade-between-commercially-available-shade-guides-and-glazed-porcelain
#9
P Manimaran, D Sai Sadan
INTRODUCTION: Smile is one of the most important interactive communication skills of a person. A smile is the key factor for an aesthetic appearance. Hence aesthetics is one of the motivating factor for the patients to seek dental care. Correction of unaesthetic appearance gives a positive effect to the self esteem of the patient. AIM: The aim of this study was to compare the difference in the shade between the commercially available shade guides namely Vita Classical And Ivoclar Chromascop and the fired porcelain samples fabricated using Vita Zahnfabrik VMK 95 and Ivoclar Classic Materials respectively...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27822956/porcelain-gallbladder
#10
Diogo Albergaria, Nuno Carvalho, Filipe Borges, António Folgado, João Corte Real
A 62-year-old female was referenced to our outpatient clinic for a single episode of right upper quadrant pain and weight loss of 3 kg in the last 6 months. No other complaints were reported. Her past medical history was unremarkable except for total hysterectomy. The upper abdominal ultrasonography and abdominal plain X-ray revealed a porcelain gallbladder.
November 2016: Revista Española de Enfermedades Digestivas
https://www.readbyqxmd.com/read/27802886/environmental-and-human-health-assessment-of-life-cycle-of-nanotio2-functionalized-porcelain-stoneware-tile
#11
Martina Pini, Federica Bondioli, Rita Montecchi, Paolo Neri, Anna Maria Ferrari
Recently, there has been a rise in the interest in nanotechnology due to its enormous potential for the development of new products and applications with higher performance and new functionalities. However, while nanotechnology might revolutionize a number of industrial and consumer sectors, there are uncertainties and knowledge gaps regarding toxicological effects of this emerging science. The goal of this research concerns the implementation into Life Cycle Assessment (LCA) of preliminary frameworks developed to evaluate human toxicity and exposure factors related to the potential nanoparticle releases that could occur during the life cycle steps of a functionalized building material...
January 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/27799424/in-situ-raman-mapping-of-art-objects
#12
D Lauwers, Ph Brondeel, L Moens, P Vandenabeele
Raman spectroscopy has grown to be one of the techniques of interest for the investigation of art objects. The approach has several advantageous properties, and the non-destructive character of the technique allowed it to be used for in situ investigations. However, compared with laboratory approaches, it would be useful to take advantage of the small spectral footprint of the technique, and use Raman spectroscopy to study the spatial distribution of different compounds. In this work, an in situ Raman mapping system is developed to be able to relate chemical information with its spatial distribution...
December 13, 2016: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/27796574/clinical-performance-of-screw-retained-and-cemented-implant-supported-zirconia-single-crowns-36-month-results
#13
Claudio Cacaci, Friederike Cantner, Thomas Mücke, Peter Randelzhofer, Jan Hajtó, Florian Beuer
OBJECTIVES: The objective of this clinical study was to evaluate the clinical performance of implant-supported zirconia crowns with a sintered veneering cap. Furthermore, the influence of the type of retention (screw-retained vs cemented single crowns) was analysed. MATERIALS AND METHODS: Fifty-eight patients were accommodated with 114 implants, inserted in the molar and premolar regions. Zirconia-based crowns with a sintered veneering cap were either screw-retained (n = 53) or cemented (n = 61) on the implant...
October 29, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27796072/time-efficiency-analysis-of-the-treatment-with-monolithic-implant-crowns-in-a-digital-workflow-a-randomized-controlled-trial
#14
Tim Joda, Urs Brägger
OBJECTIVES: The aim of the randomized controlled trial was to analyze time-efficiency of a treatment with implant crowns made of monolithic lithium disilicate (LS2) plus titanium base vs. porcelain fuse to zirconium dioxide (ZrO2 ) in a digital workflow. MATERIALS AND METHODS: Twenty study participants were included for single-tooth replacement in premolar and molar sites. Baseline was the start of the prosthetic treatment. All patients received transocclusal screw-retained implant reconstructions on a soft tissue level-type implant...
November 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/27765396/prospective-cohort-clinical-study-assessing-the-5-year-survival-and-success-of-anterior-maxillary-zirconia-based-crowns-with-customized-zirconia-copings
#15
Sami Dogan, Ariel J Raigrodski, Hai Zhang, Lloyd A Mancl
STATEMENT OF PROBLEM: Studies evaluating anterior zirconia-based crowns are limited. PURPOSE: The purpose of this prospective cohort clinical study was to assess the efficacy of zirconia-based anterior maxillary crowns with 0.3-mm customized copings at the cervical third and anatomical design elsewhere for up to 5 years of service. MATERIAL AND METHODS: Eighteen participants who required an anterior maxillary crown (n=20) and who had signed a consent form approved by the University of Washington Health Sciences Center Human Subjects Division were enrolled...
October 17, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27747233/bonding-of-metal-orthodontic-attachments-to-sandblasted-porcelain-and-zirconia-surfaces
#16
Amitoj S Mehta, Carla A Evans, Grace Viana, Ana Bedran-Russo, Maria Therese S Galang-Boquiren
This study evaluates tensile bond strength (TBS) of metal orthodontic attachments to sandblasted feldspathic porcelain and zirconia with various bonding protocols. Thirty-six (36) feldspathic and 36 zirconia disc samples were prepared, glazed, embedded in acrylic blocks and sandblasted, and divided into three groups according to one or more of the following treatments: hydrofluoric acid 4% (HF), Porcelain Conditioner silane primer, Reliance Assure® primer, Reliance Assure plus® primer, and Z Prime™ plus zirconia primer...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27738633/shear-bond-strength-of-three-orthodontic-bonding-systems-on-enamel-and-restorative-materials
#17
Andreas Hellak, Jennifer Ebeling, Michael Schauseil, Steffen Stein, Matthias Roggendorf, Heike Korbmacher-Steiner
Objective. The aim of this in vitro study was to determine the shear bond strength (SBS) and adhesive remnant index (ARI) score of two self-etching no-mix adhesives (iBond™ and Scotchbond™) on different prosthetic surfaces and enamel, in comparison with the commonly used total etch system Transbond XT™. Materials and Methods. A total of 270 surfaces (1 enamel and 8 restorative surfaces, n = 30) were randomly divided into three adhesive groups. In group 1 (control) brackets were bonded with Transbond XT primer...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27733720/qualitative-assessment-of-wear-resistance-and-surface-hardness-of-different-commercially-available-dental-porcelain-an-in-vitro-study
#18
Abhishek Singh, Abhishek Nagpal, Salil Pawah, Chetan Pathak, Gaurav Issar, Pankaj Sharma
INTRODUCTION: In an attempt to minimize wear damage to the enamel of antagonist teeth, new low and medium fusing ceramic materials have been developed. Manufacturers usually claim that these ceramics are wear-friendly because of their lower hardness, lower concentrations of crystal phase, and smaller crystal sizes. This study aimed to quantitatively analyze the wear strength of various commercially available dental porcelain with tooth enamel as well as the surface hardness of these dental porcelain...
September 1, 2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27726968/effect-of-different-aging-methods-on-the-mechanical-behavior-of-multi-layered-ceramic-structures
#19
Márcia Borba, Maico D de Araújo, Karen A Fukushima, Humberto N Yoshimura, Jason A Griggs, Álvaro Della Bona, Paulo F Cesar
OBJECTIVE: To evaluate the effect of two aging methods (mechanical cycling and autoclave) on the mechanical behavior of veneer and framework ceramic specimens with different configurations (monolithic, two and three-layers). METHODS: Three ceramics used as framework for fixed dental prostheses (YZ-Vita In-Ceram YZ; IZ-Vita In-Ceram Zirconia; AL-Vita In-Ceram AL) and two veneering porcelains (VM7 and VM9) were studied. Bar-shaped specimens were produced in three different designs: monolithic, two layers (porcelain-framework) and three layers (porcelain-framework-porcelain)...
December 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27722227/artefacts-of-implant-supported-single-crowns-impact-of-material-composition-on-artefact-volume-on-dental-mri
#20
Tim Hilgenfeld, Marcel Prager, Franz Sebastian Schwindling, Alexander Heil, Stefan Kuchenbecker, Peter Rammelsberg, Martin Bendszus, Sabine Heiland
PURPOSE: MRI allows radiation-free imaging of the head and neck area. However, implant-supported prostheses may severely impair image quality due to artefacts. Therefore, identification of preferable material compositions for implants and supported prostheses with little impact on MR image quality is mandatory. MATERIALS AND METHODS: Overall, one zirconia and four titanium dental implants were provided with different single crown materials: porcelain-fused-to-metal precious alloy (GP-T), porcelain-fused-to-metal non-precious alloy (CCT-T), porcelain-fused-to-zirconia (ZC-T) and monolithic zirconia (Z-T, Z-Z)...
2016: European Journal of Oral Implantology
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