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https://www.readbyqxmd.com/read/28532098/mechanical-behavior-of-yttria-stabilized-tetragonal-zirconia-polycrystalline-ceramic-after-different-zirconia-surface-treatments
#1
Joao Luiz Pozzobon, Gabriel Kalil Rocha Pereira, Vinicius Felipe Wandscher, Lucio Strazzabosco Dorneles, Luiz Felipe Valandro
This study investigated the effects of different zirconia surface conditioning methods on the biaxial flexure strength, surface characteristics and fractographic analysis of a Y-TZP ceramic. Disc-shaped specimens were manufactured according to ISO 6872-2008 for biaxial flexure strength testing, and then randomly assigned into seven groups (n=30). Control (CTRL): without treatment; Tribochemical silica coating (TBS): specimens were sandblasted with silica-coated aluminum oxide particles (CoJet-Sand) for 10s; Silica nanofilm (SNF): specimens were silica coated with a 5nm SiO2 nanofilm; and four protocols of low-fusing porcelain glaze (GLZ): etching with 10% hydrofluoric acid gel (HF) for 1min (GLZ1), 5min (GLZ5), 10min (GLZ10) and 15min (GLZ15)...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28509505/effects-of-different-porcelains-and-shades-on-light-transmission-and-resin-polymerization
#2
Maan Alshaafi, Mohammed AlQahtani, Richard Price
This study evaluated the effect of light-curing through two ceramics on the degree of conversion-(DC) and Knoop microhardness-(KHN) of resin cements. Three shades were used and light-cured directly on a Golden Gate attenuated total reflectance FT-IR plate at 30°C. KHN was tested immediately and after 24-h. Resin shade, type of ceramic, and storage time all had significant effects on the DC and KHN values. Within each shade, the choice of ceramic always had a significant effect, but the shade of the resin had a greater effect...
September 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28509504/marginal-adaptation-gap-width-and-fracture-strength-of-teeth-restored-with-different-all-ceramic-vs-metal-ceramic-crown-systems-an-in-vitro-study
#3
Carlo Monaco, Martin Rosentritt, Altin Llukacej, Paolo Baldissara, Roberto Scotti
This study evaluated marginal adaptation before and after thermomechanical (TCML) loading, gap width and fracture strength of all-ceramic single crowns, as compared to porcelain-fused-to-metal (PFM). Thirty extracted premolars were prepared with a round shoulder of 1.0 mm depth. Specimens were restored with zirconia-ceramic (Group 1), lithium disilicate (Group 2) and metal-ceramic single crowns (Group 3). The replica of each sample was observed with a scanning electron microscope (SEM) to evaluate the crown-cement (c-c) and tooth-cement interface (t-c)...
September 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28506654/effect-of-number-of-firings-on-the-color-and-translucency-of-ceramic-core-materials-with-veneer-ceramic-of-different-thicknesses
#4
Funda Bayindir, Ozlem Ozbayram
STATEMENT OF PROBLEM: Whether masking or translucency should be the goal for achieving an esthetic restoration with ceramic materials is unknown. PURPOSE: The purpose of this in vitro study was to examine the effect of the number of firings on the color and translucency of ceramic core material with different thicknesses of veneer ceramic. MATERIAL AND METHODS: Three different ceramic systems were used: IPS Empress (IE), IPS e.max Press (IEP), and Turkom Cera (TC)...
May 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28506651/a-load-to-fracture-and-strain-analysis-of-monolithic-zirconia-cantilevered-frameworks
#5
Faris A Alshahrani, Burak Yilmaz, Jeremy D Seidt, Edwin A McGlumphy, William A Brantley
STATEMENT OF PROBLEM: The dimensions of implant-supported fixed cantilevered prostheses are important to prevent mechanical and biological complications. Information on the optimum thickness and cantilever length for improving the strength of zirconia cantilevered frameworks is limited in the literature. PURPOSE: The purpose of this in vitro study was to investigate the effect of cantilever length and occlusocervical thickness on the load-to-fracture and strain distribution of zirconia frameworks...
May 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28503474/bonding-of-the-silane-containing-multi-mode-universal-adhesive-for-lithium-disilicate-ceramics
#6
Hyun-Young Lee, Geum-Jun Han, Juhea Chang, Ho-Hyun Son
OBJECTIVES: This study evaluated the influence of a multi-mode universal adhesive (MUA) containing silane (Single Bond Universal, 3M EPSE) on the bonding of resin cement to lithium disilicate. MATERIALS AND METHODS: Thirty IPS e.max CAD specimens (Ivoclar Vivadent) were fabricated. The surfaces were treated as follows: Group A, adhesive that did not contain silane (ANS, Porcelain Bonding Resin, Bisco); Group B, silane (S) and ANS; Group C, hydrofluoric acid (HF), S, and ANS; Group D, MUA; Group E, HF and MUA...
May 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/28494037/effect-of-abutment-preparation-and-fatigue-loading-in-a-moist-environment-on-the-fracture-resistance-of-the-one-piece-zirconia-dental-implant
#7
Mohamed Kamel, Tritala K Vaidyanathan, Robert Flinton
PURPOSE: One-piece zirconia dental implants have been widely used in Europe for many years. This in vitro study was done to evaluate the effect of abutment preparation and fatigue (cyclic) loading in a moist environment on the fracture resistance of the one-piece zirconia dental implant. MATERIALS AND METHODS: Twenty-four Cera Root zirconium oxide dental implants, divided into three groups of eight, were used in this study: group 1 (control group): implants with no preparation, tested in a dry environment; group 2: implants with no preparation, tested in a moist environment (simulating clinical conditions); and group 3: implants after abutment preparation tested in a moist environment...
May 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28492748/influence-of-resin-cements-on-color-stability-of-different-ceramic-systems
#8
Renata Borges Rodrigues, Erick de Lima, Marina Guimarães Roscoe, Carlos José Soares, Paulo Francisco Cesar, Veridiana Resende Novais
The purpose of this study was to evaluate color stability of two dental ceramics cemented with two resin cements, assessing the color difference (ΔE00) by the measurement of L*, a*, b*, c* and h* of transmittance. The combination of two ceramic system (feldspathic and lithium disilicate) and two resin cements - color A3 (RelyX ARC and Variolink II) resulted in 4 groups (n=5). Ten disks-shaped specimens were fabricated for each ceramic system (10x1.5 mm), etched with hydrofluoric acid (10%) and silanized prior to cementation...
March 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28482471/comparison-of-the-osteogenic-adipogenic-chondrogenic-and-cementogenic-differentiation-potential-of-periodontal-ligament-cells-cultured-on-different-biomaterials
#9
C C Barrera-Ortega, L Hoz-Rodríguez, H Arzate, A Fonseca-García, J Pérez-Alvarez, S E Rodil
It has been shown that the cellular responses such as adhesion, proliferation and differentiation are influenced by the surface properties, such as the topography or the surface energy. However, less is known about the effect of the chemical composition and type of material on the differentiation potential. The objective of the present paper is to compare the differentiation potential of periodontal ligament cells (HPLC) into adipocytes, osteoblasts, chondroblasts and cementoblasts of three type of materials (metals, ceramics and polymers) without using any biological induction media, but keeping the average roughness values within a limited range of 2...
July 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28474062/-evaluation-of-the-effect-of-modified-wet-particle-erosion-on-bond-strength-between-3y-tzp-zirconia-framework-and-veneering-porcelain
#10
Jing Guo, Jia Zhu, Hon-Guang Liu, Hong-Shui Zhu
PURPOSE: To evaluate the effect of bond strength between 3mol% yttrium-stabilized tetragonal zirconium polycrystal (3Y-TZP) zirconia framework after modified wet particle erosion and veneering porcelain. METHODS: A total of 174 [8 mm× 8 mm× 3 mm (±0.02)] specimens were prepared and then randomly divided into different groups according to different particle size, sandblasting pressure, sandblasting time through conventional sandblasting (experimental groups); specimens in the control group were not sandblasted...
February 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28466248/comparative-evaluation-of-the-stability-of-two-different-dental-implant-designs-and-surgical-protocols-a-pilot-study
#11
David E Simmons, Pooja Maney, Austin G Teitelbaum, Susan Billiot, Lomesh J Popat, A Archontia Palaiologou
BACKGROUND: The purpose of this study was to compare a parallel wall design implant to a tapered apex design implant when placed in the posterior maxilla using two different surgical protocols. METHODS: Twenty-seven patients (30 implants) were divided into three groups. All implants were 4 mm wide in diameter and 8 mm long. Group A received 10 tapered implants (OSPTX) (Astra Tech OsseoSpeed TX™) using the soft bone surgical protocol (TXSoft). Group B received 10 tapered implants (OSPTX) (AstraTech OsseoSpeedTX™) using the standard surgical protocol (TXStd)...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28459247/conservative-functional-and-esthetic-rehabilitation-of-severe-palatal-erosion-class-iv-using-modified-dahl-approach
#12
Aliasger Tunkiwala, Rajeev Chitguppi
This article demonstrates the clinical application of biomechanical and occlusal principles to conservatively provide optimal clinical outcomes in restoring an eroded anterior dentition. The authors manage a challenging case involving limited palatal clearance (ie, deep bite) coupled with palatal erosion and wear by combining the centric relation (CR) and Dahl principles to create anterior interocclusal space to reduce the need for more invasive palatal reduction. The combined use of adhesive restorations-resin composites on the palatal surface and indirect porcelain veneers on the facial/incisal surfaces-through enamel and dentin bonding helped optimize esthetic and functional/biomechanical aspects...
May 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28456363/aortic-homograft-replacement-in-a-patient-with-a-porcelain-aorta-a-case-report
#13
Kirolos A Jacob, Rik Rozemeijer, Annemarie M Den Harder, Willem J L Suyker
No abstract text is available yet for this article.
April 7, 2017: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28452026/micro-sized-tio2-as-photoactive-catalyst-coated-on-industrial-porcelain-gr%C3%A3-s-tiles-to-photodegrade-drugs-in-water
#14
Claudia L Bianchi, Benedetta Sacchi, Sofia Capelli, Carlo Pirola, Giuseppina Cerrato, Sara Morandi, Valentino Capucci
Pharmaceutical compounds and their metabolites raise worrying questions because of their continuous release and lack of efficient removal by conventional wastewater treatments; therefore, they are being detected in groundwater, surface water and drinking water in increasing concentrations. Paracetamol and aspirin are two of the most commonly used drugs employed as fever reducer, analgesic and anti-inflammatory. They and their metabolites are very often found in river water, so their degradation is necessary in order to render water suitable for human consumption...
April 27, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28450675/the-effect-of-heat-treatments-applied-to-superstructure-porcelain-on-the-mechanical-properties-and-microstructure-of-lithium-disilicate-glass-ceramics
#15
Hatice Özdemir, Alper Özdoğan
The aim of this study was to investigate that heat treatments with different numbers applied to superstructure porcelain whether effects microstructure and mechanical properties of lithium disilicate ceramic (LDC). Eighty disc-shaped specimens were fabricated from IPS e.max Press. Specimens were fired at heating values of porcelain in different numbers and divided four groups (n=5). Initial Vickers hardness were measured and X-ray diffraction (XRD) analysis was performed. Different surface treatment were applied and then Vickers hardness, surface roughness and environmental scanning electron microscopy (ESEM) analysis were performed...
April 26, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28437049/composite-versus-porcelain-part-3-modern-management-of-deep-caries
#16
David J Clark
No abstract text is available yet for this article.
July 2016: Dentistry Today
https://www.readbyqxmd.com/read/28428604/in-vitro-cavity-and-crown-preparations-and-direct-restorations-a-comparison-of-performance-at-the-start-and-end-of-the-fd-programme
#17
F J T Burke, V Ravaghi, L Mackenzie, N Priest, H C Falcon
Aim To assess the performance and thereby the progress of the FDs when they carried out a number of simulated clinical exercises at the start and at the end of their FD year.Methods A standardised simulated clinical restorative dentistry training exercise was carried out by a group of 61 recently qualified dental graduates undertaking a 12 months' duration foundation training programme in England, at both the start and end of the programme. Participants completed a Class II cavity preparation and amalgam restoration, a Class IV composite resin restoration and two preparations for a porcelain-metal full crown...
April 21, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28420828/y-tzp-zirconia-regeneration-firing-microstructural-and-crystallographic-changes-after-grinding
#18
Daniel Patrick Obelenis Ryan, Laiza Maria Grassi Fais, Selma Gutierrez Antonio, Gabriel Rodrigues Hatanaka, Lucas Miguel Candido, Ligia Antunes Pereira Pinelli
This study evaluated microstructural and crystallographic phase changes after grinding (G) and regeneration firing/anneling (R) of Y-TZP ceramics. Thirty five bars (Lava(TM) and Ice Zirkon) were divided: Y-TZP pre-sintered, control (C), regeneration firing (R), dry grinding (DG), dry grinding+regeneration firing (DGR), wet grinding (WG) and wet grinding+regeneration firing (WGR). Grinding was conducted using a diamond bur and annealing at 1,000°C. The microstructure was analyzed by SEM and the crystalline phases by X-ray diffraction (XRD)...
April 18, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28412039/distal-left-main-trifurcation-disease-in-a-patient-with-porcelain-aorta
#19
Ulises Lopez-Peña, Francisco Garcia-Garcia, Rogelio Robledo-Nolasco, Ernesto Fernandez-Ceseña, Ricardo Borrego-Montoya, Neisser Morales
Coronary trifurcation lesions are a complex subset of lesions and are substantially more complex than bifurcations when treated with percutaneous coronary intervention (PCI) because of higher rates of acute periprocedural complications (dissection, myocardial infarction, acute vessel closure) and less effective long-term outcomes (stent thrombosis, restenosis) as compared to non-bifurcation lesions. We present the case of a 73-year-old man who was admitted to our hospital with symptomatic severe aortic stenosis who was found to have a distal left main trifurcation disease as well as porcelain aorta on work-up...
March 8, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/28402342/survival-rates-and-bone-and-soft-tissue-level-changes-around-one-piece-dental-implants-placed-with-a-flapless-or-flap-protocol-8-5-year-results
#20
Stuart J Froum, Ismael Khouly
The purpose of the current study was to determine the survival rates and to measure marginal bone changes and peri-implant conditions 8.5 years after placement of one-piece implants with an anodically oxidized surface (AOS). A total of 52 subjects who received a one-piece implant with an AOS using a flapless or flap protocol and completed a previous randomized clinical trial were contacted for a recall visit 8.5 years after implant placement (T8.5). Implant success and survival rates, probing pocket depth (PPD), presence of bleeding on probing (BoP), papilla level, and incidence of complications and peri-implant disease were assessed by a single, blinded examiner...
May 2017: International Journal of Periodontics & Restorative Dentistry
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