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https://www.readbyqxmd.com/read/28090035/effect-of-ice-quenching-on-the-change-in-hardness-of-a-pd-au-zn-alloy-during-porcelain-firing-simulation
#1
Hye-Jeong Shin, Min-Jung Kim, Hyung-Il Kim, Yong Hoon Kwon, Hyo-Joung Seol
This study examined the effect of ice-quenching after degassing on the change in hardness of a Pd-Au-Zn alloy during porcelain firing simulations. By ice-quenching after degassing, the specimens were softened due to homogenization without the need for an additional softening heat treatment. The lowered hardness by ice-quenching after degassing was recovered greatly from the first stage of porcelain firing process by controlling the cooling rate. The increase in hardness during cooling after porcelain firing was attributed to the precipitation of the f...
January 13, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28088308/effect-of-various-polishing-systems-on-the-surface-roughness-and-phase-transformation-of-zirconia-and-the-durability-of-the-polishing-systems
#2
Chan Park, Mong-Sook Vang, Sang-Won Park, Hyun-Pil Lim
STATEMENT OF PROBLEM: Although many systems are used to polish zirconia, a comparison of the performance of zirconia and feldspathic porcelain polishing systems is lacking. PURPOSE: The purpose of this in vitro study was to compare the effects of 3 polishing systems on surface roughness, zirconia phase transformation, and durability of the polishing systems when applied to zirconia and feldspathic porcelain. MATERIAL AND METHODS: Three polishing systems were evaluated: Z1, a zirconia polishing system; Z2, a zirconia polishing system, and F1, a feldspathic porcelain polishing system...
January 11, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28074827/the-perceval-s-aortic-valve-implantation-in-patients-with-porcelain-aorta-is-this-ideal-option
#3
Nikolaos G Baikoussis, Panagiotis Dedeilias, Efstathia Prappa, Michalis Argiriou
We would like to present in this paper a patient with severe aortic valve stenosis referred to our department for surgical aortic valve replacement. In this patient, it was intraoperatively detected an unexpected heavily calcified porcelain ascending aorta. We present the treatment options in this situation, the difficulties affronted intraoperatively, the significance of the preoperative chest computed tomography scan and the use of the Perceval S aortic valve as ideal bioprosthesis implantation. This is a self-expanding, self-anchoring, and sutureless valve with a wide indication in all patients requiring aortic bioprosthesis...
January 2017: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/28073571/early-clinical-outcomes-of-a-novel-self-expanding-transapical-transcatheter-aortic-valve-bioprosthesis
#4
Michael W A Chu, Rodrigo Bagur, Katie L Losenno, Philip M Jones, Pantelis Diamantouros, Patrick Teefy, Jill J Gelinas, Bob Kiaii
OBJECTIVE: Coronary obstruction remains a challenging complication of transcatheter aortic valve replacement; however, a new self-expanding transapical prosthesis may reduce this risk. The purpose of this study was to evaluate the early 1-year outcomes of patients with low coronary heights who received the Acurate TA bioprosthesis (Symetis, Ecublens, Switzerland). METHODS: Between May 2014 and April 2015, 30 consecutive patients (aged 85 ± 6 years, 63% were female, Society of Thoracic Surgeons score 8...
December 15, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28060024/stress-distribution-in-an-implant-supported-mandibular-complete-denture-using-different-cantilever-lengths-and-occlusal-coating-materials
#5
Rodrigo Antonio de Medeiros, Marcelo Coelho Goiato, Aldiéris Alves Pesqueira, Aljomar José Vechiato Filho, Liliane da Rocha Bonatto, Daniela Micheline Dos Santos
PURPOSE: The aim of this study was to assess stress distribution in the bone-implant interface of a mandibular implant-supported prosthesis with different cantilever lengths, aesthetic coating materials, and implant abutments. MATERIALS AND METHODS: A photoelastic model of an edentulous mandible, containing 5 external hexagon implants, was constructed. Experimental models were divided into 6 groups: group 1-UCLA component and metal bar; group 2-UCLA component and acrylic resin coating; group 3-UCLA component and porcelain coating; group 4-abutment and metal bar; group 5-abutment and acrylic resin coating; and group 6-abutment and porcelain coating...
January 4, 2017: Implant Dentistry
https://www.readbyqxmd.com/read/28054794/full-mouth-implant-rehabilitation-with-monolithic-zirconia-benefits-and-limitations
#6
Sarah Amin, Hans-Peter Weber, Yukio Kudara, Panos Papaspyridakos
As increased chipping rates have been reported with porcelain-fused-to-zirconia fixed dental prostheses, monolithic zirconia has been introduced in an effort to reduce the technical complications associated with bilayered ceramics. This clinical report illustrates the steps for achieving full-mouth implant rehabilitation with monolithic zirconia prostheses and minimal facial porcelain veneering. The benefits and limitations of this technique are also discussed. The incisal edges and occluding surface areas comprised monolithic zirconia to reduce the possibility of breakage and improve the esthetic outcome...
January 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28044972/-giant-viruses-update-enigmas-controversies-and-perspectives
#7
Jean-Michel Claverie, Chantal Abergel
Unlike microbes known in his time, the first virus (that of tobacco mosaic disease) was discovered by Ivanoski in 1892 because it was not retained by Chamberland's porcelain candles. For more than a century afterward, viruses were equated with this simple property that is still extensively used today (using modern 0,2 µm pore filters) as a practical criterion to delineate the "viral fraction" from other microbes in medical or environmental samples. The first documented exception to the simplistic criterion of particle size came with the discovery of Mimivirus, the viral nature of which was eventually recognized in 2003, following ten years during which it was mistaken for an obligate intracellular bacterium...
December 2016: Médecine Sciences: M/S
https://www.readbyqxmd.com/read/28018561/comparison-of-the-fit-accuracy-of-zirconia-based-prostheses-generated-by-two-cad-cam-systems
#8
Seok-Joon Ha, Jin-Hyun Cho
PURPOSE: The purposes of this study are to evaluate the internal and marginal adaptation of two widely used CAD/CAM systems and to study the effect of porcelain press veneering process on the prosthesis adaptation. MATERIALS AND METHODS: Molar of a lower jaw typodont resin model was prepared by adjusting a 1.0 mm circumferential chamfer, an occlusal reduction of 2.0 mm, and a 5° convergence angle and was duplicated as an abrasion-resistant master die. The monolithic crowns and copings were fabricated with two different CAD/CAM system-Ceramil and Zirkonzahn systems...
December 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28007135/sex-based-differences-in-outcomes-with-transcatheter-aortic-valve-therapy-tvt-registry-from-2011-to-2014
#9
Jaya Chandrasekhar, George Dangas, Jennifer Yu, Sreekanth Vemulapalli, Sunil Suchindran, Amit N Vora, Usman Baber, Roxana Mehran
BACKGROUND: A differential impact of sex has been observed in transcatheter aortic valve replacement (TAVR) outcomes from small observational studies and subgroup analyses of randomized trials. OBJECTIVES: The goal of this study was to compare the in-hospital and 1-year outcomes in male and female subjects from the U.S. nationwide TAVR registry. METHODS: National data from the Society of Thoracic Surgeons/American College of Cardiology Transcatheter Valve Therapy Registry were used for in-hospital outcomes, and data linked from the Centers for Medicare & Medicaid Services were used to provide 1-year events...
December 27, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/28006713/influence-of-sodalite-zeolite-infiltration-on-the-coefficient-of-thermal-expansion-and-bond-strength-of-all-ceramic-dental-prostheses
#10
Ghassan Abdul-Hamid Naji, Ros Anita Omar, Rosiyah Yahya
In all-ceramic systems, a high incidence of veneer chip-off has been reported in clinical studies. Coefficient of thermal expansion (CTE) behaviour is one of the factors that may increase residual stress in the interface and influence the veneer/core bond strength. Therefore, this study aimed to evaluate the effect of sodalite zeolite-infiltration on the CTE behaviour and bond strength of different all-ceramic prostheses. The case-study groups were synthesized sodalite zeolite-infiltrated alumina (IA-SOD) and synthesized sodalite zeolite-infiltrated zirconia-toughened alumina (ZTA) (IZ-SOD), while the control groups were glass-infiltrated alumina (IA-glass) and glass-infiltrated ZTA (IZ-glass)...
December 15, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28003886/porcelain-gallbladder-decoding-the-malignant-truth
#11
REVIEW
Norman O Machado
Gallbladder calcification, also referred to as porcelain gallbladder, has received significant attention in the medical literature due to its perceived role in increasing the risk of developing a gallbladder carcinoma. However, recent reports raise questions challenging this purported high risk. While previous studies reported a concomitant incidence of gallbladder cancer in porcelain gallbladder ranging from 7-60%, more recent analyses indicate the incidence to be much lower (6%). Based on evidence in the current literature, a prophylactic cholecystectomy is not routinely recommended for all patients with porcelain gallbladder and should be restricted to those with conventional indications, such as young patients...
November 2016: Sultan Qaboos University Medical Journal
https://www.readbyqxmd.com/read/27997143/desorption-of-svocs-from-heated-surfaces-in-the-form-of-ultrafine-particles
#12
Lance Arthur Wallace, Wayne R Ott, Charles J Weschler, Alvin C K Lai
Ultrafine particles (UFP) produced by electric heating of stoves and metal cooking pans, absent food, have been hypothesized to be created from a surface film of semivolatile organic compounds (SVOCs) sorbed from the surrounding air. This study tests that hypothesis by size-resolved measurements extending the lower range of the UFP studied from 10 nm to 2.3 nm, and including other surfaces (glass, aluminum, and porcelain). Heating glass Petri dishes or squares of aluminum foil to about 350-400 oC for 4-6 minutes removed all sorbed organic substances completely...
December 20, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/27995653/influence-of-misfit-on-the-occurrence-of-veneering-porcelain-fractures-chipping-in-implant-supported-metal-ceramic-fixed-dental-prostheses-an-in%C3%A2-vitro-pilot-trial
#13
Nils Löfgren, Christel Larsson, Nikos Mattheos, Martin Janda
OBJECTIVE: Technical complications such as veneer fractures are more common in implant-supported than tooth-supported restorations. The underlying causes have not been fully identified. The aim of this study was to evaluate whether misfit between the restoration and the implant may affect the risk of veneer fractures. MATERIALS AND METHODS: Twenty standardized five-unit implant-supported metal-ceramic fixed dental prostheses (FDP)s were manufactured and fixed in acrylic blocks...
December 19, 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/27987657/influence-of-interlayer-design-on-residual-thermal-stresses-in-trilayered-and-graded-all-ceramic-restorations
#14
Bruno Henriques, Douglas Fabris, Júlio C M Souza, Filipe S Silva, Joana Mesquita-Guimarães, Yu Zhang, Márcio Fredel
Residual thermal stresses are formed in dental restorations during cooling from high temperature processing. The aim of this study was to evaluate the influence of constructive design variables (composition and interlayer thickness) on residual stresses in alumina- and zirconia-graded restorations. Restorations' real-like cooling conditions were simulated using finite elements method and temperature-dependent material properties were used. Three different designs were evaluated: a bilayered restoration (sharp transition between materials); a trilayered restoration with a homogenous interlayer between core and veneer; and a trilayered restoration with a graded interlayer...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27982231/low-fusing-porcelain-glaze-application-on-3y-tzp-surfaces-can-enhance-zirconia-porcelain-adhesion
#15
Lígia Tiaki Yamamoto, Vinícius Anéas Rodrigues, Lucio Strazzabosco Dornelles, Marco Antonio Bottino, Luiz Felipe Valandro, Renata Marques de Melo
The aim of this study was to assess whether surface treatment improves zirconia-porcelain adhesion. The 3Y-TZP blocks were cut into squares, then polished and sintered. The zirconia surface treatments were performed as follows: no treatment (C); tribochemical silica coating (TBS); glaze application + hydrofluoric acid etching (GA); glaze application + hydrofluoric acid etching + silanization (GAS); deposition of silica nanofilm (NF). After treatments, veneering porcelain cylinders (3.3 x 3.3 mm) were built up on all specimens and fired...
September 2016: Brazilian Dental Journal
https://www.readbyqxmd.com/read/27982228/effect-of-glaze-cooling-rate-on-mechanical-properties-of-conventional-and-pressed-porcelain-on-zirconia
#16
Diogo Longhini, Cibele Oliveira de Melo Rocha, Igor Studart Medeiros, Renata Garcia Fonseca, Gelson Luis Adabo
The aim of this study was to characterize a conventional and a pressed porcelain for zirconia core as to biaxial flexural strength (BFS), apparent fracture toughness (FT) and microstructure composition, and to investigate the effect of glaze cooling rate on the BFS of the zirconia/porcelain bilayers. Monolayers of conventional porcelain Vita VM9 and pressed porcelain Vita PM9 (n=15) (12 mm diameter x 1.2 mm thick) were prepared for the BFS test (MPa). Apparent fracture toughness (MPa.m1/2) was measured by indentation technique (n=15)...
September 2016: Brazilian Dental Journal
https://www.readbyqxmd.com/read/27982193/use-of-feldspathic-porcelain-veneers-to-improve-smile-harmony-a-3-year-follow-up-report
#17
Leonardo Federizzi, Érica Alves Gomes, Samantha Schaffer Pugilato Báratro, Flares Baratto-Filho, Ataís Bacchi, Aloísio Oro Spazzin
This case report describes an esthetic treatment to improve the shape and alignment of the anterior teeth, reestablishing smile harmony, using feldspathic porcelain veneers. Results of clinical follow up after 36 months are also presented. The advantages, disadvantages and limitations of the technique are detailed with reference to the relevant literature. This suggests that the success of treatment depends on adequate conditions of bonding between the veneers and the tooth complex, which involves parameters such as the strength and durability of the bond interface...
October 2016: Brazilian Dental Journal
https://www.readbyqxmd.com/read/27964932/effects-of-different-electrolytes-for-micro-arc-oxidation-on-the-bond-strength-between-titanium-and-porcelain
#18
Xiaohui Yuan, Fei Tan, Haitao Xu, Shaojun Zhang, Fuzhen Qu, Jie Liu
PURPOSE: The aim of this study is to investigate the effects of different electrolytes on the titanium-porcelain bond strength after micro-arc oxidation (MAO) treatment. METHODS: Three electrolytes at the same concentration were used as MAO reaction solutions: Na2SiO3, KF, and MgSiF6. Blasting treatment was chosen as a control. After MAO treatment in each electrolyte, the titanium-porcelain bond strengths were measured by the three-point bending test, as described in ISO 9693...
December 7, 2016: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/27957283/treatment-and-restoration-of-adult-dentoalveolar-trauma-a-clinical-case-report
#19
Blanca Serra-Pastor, Miguel Penarrocha-Diago, María Penarrocha-Diago, Rubén Agustín-Panadero
Adult dentoalveolar trauma most often occurs in the context of sports activities and traffic accidents. Coronal fractures are the most common type of lesion, followed by tooth luxation. We present the case of a 25-year-old woman who suffered alveolar bone damage and coronal fractures of the upper incisors, with extrusive luxation of the right central incisor, as the result of a fall. On the first visit, manual reduction of the buccal plate was carried out under local anesthesia, with repositioning of the right central incisor and splinting to the neighboring teeth...
December 2016: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/27942403/the-future-of-off-pump-coronary-artery-bypass-grafting-a-north-american-perspective
#20
Bobby Yanagawa, Rashmi Nedadur, John D Puskas
Off-pump coronary artery bypass graft (OPCAB) is currently performed routinely in a minority of specialized centers and in many more centers, utilized only when a porcelain aorta mandates a no-touch aortic technique. The OPCAB literature can be summarized as follows: (I) large-scale randomized trials in relatively low risk patients that include surgeons with a range of experience demonstrating no consistent beneficial differences in major cardiovascular and cerebrovascular outcomes but lower transfusion rates and shorter length of stay, tempered by some reports of higher rates of incomplete revascularization and lower rates of long term graft patency; (II) smaller randomized controlled trials (RCTs) from highly specialized programs demonstrating equivalent or superior outcomes with OPCAB and similar completeness of revascularization and graft patency; and (III) observational data from large databases demonstrating a consistent benefit of OPCAB, especially in higher-risk patient subsets...
November 2016: Journal of Thoracic Disease
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