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https://www.readbyqxmd.com/read/28936283/influence-of-thermal-and-mechanical-fatigue-on-the-shear-bond-strength-of-different-all-ceramic-systems
#1
Hugo-Alberto Vidotti, Jefferson-Ricardo Pereira, Elizeu Insaurralde, Luiz F Plaça, José R Delben, Accácio-Lins do Valle
BACKGROUND: To evaluate the influence of thermal and mechanical fatigue on the shear bond strength of different all-ceramic cores and veneering porcelain interfaces. MATERIAL AND METHODS: All-ceramic systems tested were lithium disilicate and zirconia veneered by layering technique. Sixty specimens (n=20) were subjected to shear bond strength. Ten of them were thermal and mechanical cycled. Fracture analysis was performed with stereomicroscopy and scanning electron microscopy...
August 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28936039/comparative-three-dimensional-finite-element-analysis-of-implant-supported-fixed-complete-arch-mandibular-prostheses-in-two-materials
#2
João Paulo Mendes Tribst, Dayana Campanelli de Morais, Alexandre Abhdala Alonso, Amanda Maria de Oliveira Dal Piva, Alexandre Luis Souto Borges
BACKGROUND: The increase of requests for implant-supported prosthesis (ISP) with zirconia as infrastructure has attracted a lot of attention due to its esthetics, biocompatibility, and survival rate similar to metallic infrastructure. The aim of this study was to evaluate the influence of two different framework materials on stress distribution over a bone tissue-simulating material. MATERIALS AND METHODS: Two ISP were modeled and divided into two infrastructure materials: titanium (Ti) and zirconia...
July 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28935192/effect-of-priming-agents-on-shear-bond-strengths-of-resin-based-luting-agents-to-a-translucent-zirconia-material
#3
Shogo Yagawa, Futoshi Komine, Ryosuke Fushiki, Kei Kubochi, Fumiaki Kimura, Hideo Matsumura
PURPOSE: The purpose of the present study was to evaluate the effect of priming agents and artificial aging with thermocycling on shear bond strengths of two resin-based luting agents to a translucent zirconia material. METHODS: A total of 308 pairs of translucent zirconia disk specimens were divided into seven treatment groups: Alloy Primer (ALP), Clearfil Ceramic Primer Plus (CCP), Meta Fast Bonding Liner (MFB), MR. bond (MRB), Super-Bond PZ Primer Liquid B (PZB), V-Primer (VPR), and an unprimed group (UP)...
September 18, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28927925/optical-properties-of-zirconia-ceramics-for-esthetic-dental-restorations-a-systematic-review
#4
REVIEW
Reza Shahmiri, Owen Christopher Standard, Judy N Hart, Charles Christopher Sorrell
STATEMENT OF PROBLEM: Yttria-stabilized tetragonal zirconia polycrystal has been used as a dental biomaterial for several decades because the fracture toughness and bend strength are increased by a stress-induced transformation-toughening mechanism. However, its esthetics are compromised by its poor translucency and grayish-white appearance. PURPOSE: The purpose of the present systematic review was to assess information on the mechanical, chemical, and optical requirements of monolithic zirconia dental restorations...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28923546/influence-of-implant-abutment-material-and-ceramic-thickness-on-optical-properties
#5
Bundhit Jirajariyavej, Peeraphorn Wanapirom, Chuchai Anunmana
STATEMENT OF PROBLEM: Anterior shade matching is an essential factor influencing the esthetics of a ceramic restoration. Dentists face a challenge when the color of an implant abutment creates an unsatisfactory match with the ceramic restoration or neighboring teeth. PURPOSE: The purpose of this in vitro study was to evaluate the influence of abutment material and ceramic thickness on the final color of different ceramic systems. MATERIAL AND METHODS: Four experimental and control ceramic specimens in shade A3 were cut from IPS e...
September 16, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28918009/low-temperature-degradation-of-single-layers-of-multilayered-zirconia-in-comparison-to-conventional-unshaded-zirconia-phase-transformation-and-flexural-strength
#6
Sebastian Wille, Paul Zumstrull, Victor Kaidas, Lea Katharina Jessen, Matthias Kern
OBJECTIVES: The aim of this study was to evaluate the transformation of yttrium stabilized tetragonal zirconia (Y-TZP) to monoclinic phase and its change in flexural strength of the various layers of multilayered zirconia (enamel layer, transition layer 1, transition layer 2 and body layer) in comparison to two conventional zirconia ceramics. Additionally, the ball-on-three-balls test was compared with a conventional biaxial flexural strength test. METHODS: The crystallographic structure of the four layers of Katana Zirconia ML (Kuraray), e...
September 8, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28916163/effects-of-small-grit-grinding-and-glazing-on-mechanical-behaviors-and-ageing-resistance-of-a-super-translucent-dental-zirconia
#7
Xuan Lai, Wenjie Si, Danyu Jiang, Ting Sun, Longquan Shao, Bin Deng
OBJECTIVES: The purpose of this study is to elucidate the effects of small-grit grinding on the mechanical behaviors and ageing resistance of a super-translucent dental zirconia and to investigate the necessity of glazing for the small-grit ground zirconia. METHODS: Small-grit grinding was performed using two kinds of silicon carbide abrasive papers. The control group received no grinding. The unground surfaces and the ground surfaces were glazed by an experienced dental technician...
September 12, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28914306/enhanced-intermediate-temperature-co2-splitting-using-nonstoichiometric-ceria-and-ceria-zirconia
#8
Zhenlong Zhao, Mruthunjaya Uddi, Nikolai Tsvetkov, Bilge Yildiz, Ahmed F Ghoniem
CO2 splitting via thermo-chemical or reactive redox has emerged as a novel and promising carbon-neutral energy solution. Its performance depends critically on the properties of the oxygen carriers (OC). Ceria is recognized as one of the most promising OC candidates, because of its fast chemistry, high ionic diffusivity, and large oxygen storage capacity. The fundamental surface ion-incorporation pathways, along with the role of surface defects and the adsorbates remain largely unknown. This study presents a detailed kinetics study of CO2 splitting using CeO2 and Ce0...
September 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28906500/fracture-of-reduced-diameter-zirconia-dental-implants-following-repeated-insertion
#9
Matthias Karl, Stefan Scherg, Tanja Grobecker-Karl
PURPOSE: Achievement of high insertion torque values indicating good primary stability is a goal during dental implant placement. The objective of this study was to evaluate whether or not two-piece implants made from zirconia ceramic may be damaged as a result of torque application. MATERIALS AND METHODS: A total of 10 two-piece zirconia implants were repeatedly inserted into polyurethane foam material with increasing density and decreasing osteotomy size. The insertion torque applied was measured, and implants were checked for fractures by applying the fluorescent penetrant method...
September 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28902420/one-piece-zirconia-oral-implants-for-single-tooth-replacement-three-year-results-from-a-long-term-prospective-cohort-study
#10
Ralf-Joachim Kohal, Benedikt Christopher Spies, Annalena Bauer, Frank Butz
AIM: This 3-year report of a prospective long-term cohort investigation aimed to evaluate the clinical and radiographic outcomes of a one-piece zirconia oral implant for single tooth replacement. MATERIALS AND METHODS: 65 patients received a 1-stage implant surgery with immediate temporization. Standardized radiographs were taken at implant insertion, after 1 year, and after 3 years to monitor peri-implant bone levels. A univariate analysis of the association of different baseline parameters on marginal bone loss from implant insertion to 36 months was performed...
September 13, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28902238/dental-ceramics-a-review-of-new-materials-and-processing-methods
#11
Lucas Hian da Silva, Erick de Lima, Ranulfo Benedito de Paula Miranda, Stéphanie Soares Favero, Ulrich Lohbauer, Paulo Francisco Cesar
The evolution of computerized systems for the production of dental restorations associated to the development of novel microstructures for ceramic materials has caused an important change in the clinical workflow for dentists and technicians, as well as in the treatment options offered to patients. New microstructures have also been developed by the industry in order to offer ceramic and composite materials with optimized properties, i.e., good mechanical properties, appropriate wear behavior and acceptable aesthetic characteristics...
August 28, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28890971/quantitative-interpretation-of-impedance-spectroscopy-data-on-porous-lsm-electrodes-using-x-ray-computed-tomography-and-bayesian-model-based-analysis
#12
Giuseppe F Brunello, William K Epting, Juwana de Silva, Paul A Salvador, Shawn Litster, Harry O Finklea, Yueh-Lin Lee, Kirk R Gerdes, David S Mebane
It is broadly understood that strontium-doped lanthanum manganate (LSM) cathodes for solid oxide fuel cells (SOFCs) have two pathways for the reduction of oxygen: a surface-mediated pathway culminating in oxygen incorporation into the electrolyte at the triple-phase boundary (TPB), and a bulk-mediated pathway involving oxygen transfer across the electrode-electrolyte interface. Patterned electrode and thin film experiments have shown that both pathways are active in LSM. Porous electrode geometries more commonly found in SOFCs have not been amenable for precise measurement of active electrode width because of the difficulty in precisely measuring the electrode geometry...
September 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28888428/displacement-comparison-of-cad-cam-titanium-and-zirconia-abutments-to-implants-with-different-conical-connections
#13
Burak Yilmaz, Shervin Hashemzadeh, Jeremy D Seidt, Nancy L Clelland
PURPOSE: To compare the displacements of CAD-CAM zirconia and titanium abutments into different internal connection systems after torquing. METHODS: OsseoSpeed EV and OsseoSpeed TX implants (n=10) were placed in resin blocks. Zirconia and titanium abutments (n=5) were first hand tightened and then tightened to the recommended torque (20Ncm for TX and 25Ncm for EV). Displacements of abutments between screw tightening by hand and torque driver was measured using three-dimensional digital image correlation (3D DIC) technique...
September 6, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28888071/the-effect-of-ventricular-assist-device-associated-biomaterials-on-human-blood-leukocytes
#14
Gemma Radley, Ina Laura Pieper, Catherine A Thornton
Ventricular assist devices (VADs) are an effective bridging or destination therapy for patients with advanced stage heart failure. These devices remain susceptible to adverse events including infection, bleeding, and thrombus; events linked to the foreign body response. Therefore, the biocompatibility of all biomaterials used is crucial to the success of medical devices. Biomaterials common in VADs-DLC: diamond-like carbon coated stainless steel; Sap: single-crystal sapphire; SiN: silicon nitride; Ti: titanium alloy; and ZTA: zirconia-toughened alumina-were tested for their biocompatibility through incubation with whole human blood for 2 h with mild agitation...
September 9, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28884060/low-temperature-co-oxidation-over-cu-pt-co-doped-zro2-nanoparticles-synthesized-by-solution-combustion
#15
Amit Singhania, Shipra Mital Gupta
Zirconia (ZrO2) nanoparticles co-doped with Cu and Pt were applied as catalysts for carbon monoxide (CO) oxidation. These materials were prepared through solution combustion in order to obtain highly active and stable catalytic nanomaterials. This method allows Pt(2+) and Cu(2+) ions to dissolve into the ZrO2 lattice and thus creates oxygen vacancies due to lattice distortion and charge imbalance. High-resolution transmission electron microscopy (HRTEM) results showed Cu/Pt co-doped ZrO2 nanoparticles with a size of ca...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28883302/effect-of-framework-design-on-fracture-load-after-thermal-cycling-and-mechanical-loading-of-implant-supported-zirconia-based-prostheses
#16
Futoshi Komine, Shingo Kamio, Hiroki Takata, Shogo Yagawa, Serina Taguchi, Kohei Taguchi, Akiko Hashiguchi, Hideo Matsumura
This study evaluated the effect of zirconia framework design on fracture load of implant-supported zirconia-based prostheses after thermal cycling and mechanical loading. Three different zirconia framework designs were investigated: uniform-thickness (UNI), anatomic (ANA), and supported anatomic (SUP) designs. Each framework was layered with feldspathic porcelain (ZAC group) or indirect composite material (ZIC group). The specimens then underwent fracture load testing after thermal cycling and cyclic loading...
September 7, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28876966/the-effect-of-resin-bonding-on-long-term-success-of-high-strength-ceramics
#17
M B Blatz, M Vonderheide, J Conejo
Digital manufacturing, all-ceramics, and adhesive dentistry are currently the trendiest topics in clinical restorative dentistry. Tooth- and implant-supported fixed restorations from computer-aided design (CAD)/computer-aided manufacturing (CAM)-fabricated high-strength ceramics-namely, alumina and zirconia-are widely accepted as reliable alternatives to traditional metal-ceramic restorations. Most recent developments have focused on high-translucent monolithic full-contour zirconia restorations, which have become extremely popular in a short period of time, due to physical strength, CAD/CAM fabrication, and low cost...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28874999/comparison-of-retention-forces-with-various-fabrication-methods-and-materials-in-double-crowns
#18
Melahat Çelik Güven, Meral Tuna, Ergun Bozdağ, Gizem Nur Öztürk, Gulsen Bayraktar
PURPOSE: The purpose of this study was to analyze the retention force changes and wear behaviours of double-crown systems over long-term use. MATERIALS AND METHODS: Ten groups, each consisting of six samples, were evaluated. Specifically, casting gold alloy primary crown - casting gold alloy secondary crown (AA), laser sintering primary crown - laser sintering secondary crown (LL), casting Cr alloy primary crown - casting Cr alloy secondary crown, (CC) zirconia primary crown - electroformed secondary crown (ZA), and CAD/CAM titanium alloy primary crown - CAD/CAM titanium alloy secondary crown (TT) groups were evaluated at cone angles of 4° and 6°...
August 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28874994/comparison-of-fit-accuracy-and-torque-maintenance-of-zirconia-and-titanium-abutments-for-internal-tri-channel-and-external-hex-implant-connections
#19
Hakimeh Siadat, Elaheh Beyabanaki, Niloufar Mousavi, Marzieh Alikhasi
PURPOSE: This in vitro study aimed to evaluate the effect of implant connection design (external vs. internal) on the fit discrepancy and torque loss of zirconia and titanium abutments. MATERIALS AND METHODS: Two regular platform dental implants, one with external connection (Brånemark, Nobel Biocare AB) and the other with internal connection (Noble Replace, Nobel Biocare AB), were selected. Seven titanium and seven customized zirconia abutments were used for each connection design...
August 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28874991/ceramic-molar-crown-reproducibility-by-digital-workflow-manufacturing-an-in-vitro-study
#20
Ii-Do Jeong, Woong-Chul Kim, Jinyoung Park, Chong-Myeong Kim, Ji-Hwan Kim
PURPOSE: This in vitro study aimed to analyze and compare the reproducibility of zirconia and lithium disilicate crowns manufactured by digital workflow. MATERIALS AND METHODS: A typodont model with a prepped upper first molar was set in a phantom head, and a digital impression was obtained with a video intraoral scanner (CEREC Omnicam; Sirona GmbH), from which a single crown was designed and manufactured with CAD/CAM into a zirconia crown and lithium disilicate crown (n=12)...
August 2017: Journal of Advanced Prosthodontics
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