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Zirconia

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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
#1
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/28087075/cellular-transcriptional-response-to-zirconia-based-implant-materials
#2
Brigitte Altmann, Kerstin Rabel, Ralf J Kohal, Susanne Proksch, Pascal Tomakidi, Erik Adolfsson, Falk Bernsmann, Paola Palmero, Tobias Fürderer, Thorsten Steinberg
OBJECTIVE: To adequately address clinically important issues such as osseointegration and soft tissue integration, we screened for the direct biological cell response by culturing human osteoblasts and gingival fibroblasts on novel zirconia-based dental implant biomaterials and subjecting them to transcriptional analysis. METHODS: Biomaterials used for osteoblasts involved micro-roughened surfaces made of a new type of ceria-stabilized zirconia composite with two different topographies, zirconium dioxide, and yttria-stabilized zirconia (control)...
January 10, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28077209/residual-compressive-surface-stress-increases-the-bending-strength-of-dental-zirconia
#3
Masanao Inokoshi, Fei Zhang, Kim Vanmeensel, Jan De Munck, Shunsuke Minakuchi, Ignace Naert, Jozef Vleugels, Bart Van Meerbeek
OBJECTIVE: To assess the influence of surface treatment and thermal annealing on the four-point bending strength of two ground dental zirconia grades. METHODS: Fully-sintered zirconia specimens (4.0×3.0×45.0mm(3)) of Y-TZP zirconia (LAVA Plus, 3M ESPE) and Y-TZP/Al2O3 zirconia (ZirTough, Kuraray Noritake) were subjected to four surface treatments: (1) 'GROUND': all surfaces were ground with a diamond-coated grinding wheel on a grinding machine; (2) 'GROUND+HEAT': (1) followed by annealing at 1100°C for 30min; (3) 'GROUND+Al2O3 SANDBLASTED': (1) followed by sandblasting using Al2O3; (4) 'GROUND+CoJet SANDBLASTED': (1) followed by tribochemical silica (CoJet) sandblasting...
January 8, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28073074/tribocorrosion-behavior-of-bio-functionalized-highly-porous-titanium
#4
F Toptan, A C Alves, A M P Pinto, P Ponthiaux
Titanium and its alloys are widely used in orthopedic and dental implants, however, some major clinical concerns such as poor wear resistance, lack of bioactivity, and bone resorption due to stress shielding are yet to be overcome. In order to improve these drawbacks, highly porous Ti samples having functionalized surfaces were developed by powder metallurgy with space holder technique followed by anodic treatment. Tribocorrosion tests were performed in 9g/L NaCl solution using a unidirectional pin-on-disc tribometer under 3N normal load, 1Hz frequency and 4mm track diameter...
January 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28069245/extended-glaze-firing-on-ceramics-for-hard-machining-crack-healing-residual-stresses-optical-and-microstructural-aspects
#5
Iana L Aurélio, Lucio S Dorneles, Liliana G May
OBJECTIVE: To evaluate the effect of extended and conventional (manufacturer-recommended) glaze firings on crack healing, residual stresses, optical characteristics and crystalline structure of four ceramics for hard machining. METHODS: Rectangular specimens were obtained by sectioning densely sintered feldspathic (FEL), leucite- (LEU), lithium disilicate- (DIS), and zirconia-reinforced lithium silicate-based (ZLS) prefabricated ceramic blocks and divided into groups according to the applied glaze firing (n=5): conventional glaze/manufacturer-recommended (G), extended glaze (EG) and control/no heat treatment (C)...
January 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28068266/translucency-and-strength-of-high-translucency-monolithic-zirconium-oxide-materials
#6
Todd D Church, Jeffrey P Jessup, Villa L Guillory, Kraig S Vandewalle
The purpose of this study was to evaluate the translucency and strength of highly translucent monolithic zirconia ceramic materials recently introduced to the market. Four monolithic zirconium oxide materials promoted as having high translucency (BruxZir Shaded 16, BruxZir HT, Lava Plus, and inCoris TZI C) were compared to a high-translucency, lithium disilicate monolithic glass-ceramic material (IPS e.max CAD HT). To evaluate translucency, the materials were sectioned into 0.5-, 1.0-, 1.5-, and 2.0-mm-thick specimens; all were sintered and polished...
January 2017: General Dentistry
https://www.readbyqxmd.com/read/28060492/tetragonal-to-cubic-transformation-of-sio2-stabilized-zro2-polymorph-through-dysprosium-substitutions
#7
Subramaniyan Vasanthavel, Brian Derby, Sanjeevi Kannan
Partially stabilized tetragonal zirconia (t-ZrO2) is of particular interest for hard tissue replacements. Aging-related failures of the ceramic associated with the gradual transformation from t-ZrO2 to m-ZrO2 (monoclinic zirconia) can lead to its premature removal from the implant site. In addition, monitoring the satisfactory performance of the implant throughout its lifespan without invasive techniques is a challenging task. The magnetic resonance imaging (MRI) contrast ability of dysprosium (Dy(3+)) is well-established...
January 6, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28054794/full-mouth-implant-rehabilitation-with-monolithic-zirconia-benefits-and-limitations
#8
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/28024816/zirconia-changes-after-grinding-and-regeneration-firing
#9
Gabriel R Hatanaka, Gabriela S Polli, Laiza M G Fais, José Maurício Dos S N Reis, Lígia A P Pinelli
STATEMENT OF PROBLEM: Despite improvements in computer-aided design and computer-aided manufacturing (CAD-CAM) systems, grinding during either laboratory procedures or clinical adjustments is often needed to modify the shape of 3 mol(%) yttria-tetragonal zirconia polycrystal (3Y-TZP) restorations. However, the best way to achieve adjustment is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the microstructural and crystallographic phase changes, flexural strength, and Weibull modulus of a 3Y-TZP zirconia after grinding with or without water cooling and regeneration firing...
December 23, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28024784/assessing-the-feasibility-of-yttria-stabilized-zirconia-in-novel-designs-as-mandibular-anterior-fixed-lingual-retention-after-orthodontic-treatment
#10
Matthew M Stout, Brian K Cook, Dwayne D Arola, Hanson Fong, Ariel J Raigrodski, Anne-Marie Bollen
INTRODUCTION: The purpose of this study is to explore the feasibility of yttria-stabilized zirconia (Y-TZP) in fixed lingual retention as an alternative to stainless steel. METHODS: Exploratory Y-TZP specimens were milled to establish design parameters. Next, the specimens were milled according to ASTM standard C1161-13 and subjected to 4-point flexural tests to determine material properties. Finite element analysis was used to evaluate 9 novel cross-sectional designs, which were compared with stainless steel wire...
January 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28024588/surface-analysis-and-shear-bond-strength-of-zirconia-on-resin-cements-after-non-thermal-plasma-treatment-and-or-primer-application-for-metallic-alloys
#11
Aljomar José Vechiato-Filho, Adaias Oliveira Matos, Richard Landers, Marcelo Coelho Goiato, Elidiane Cipriano Rangel, Grace Mendonça De Souza, Valentim Adelino Ricardo Barão, Daniela Micheline Dos Santos
There is no established protocol for bonding zirconia (Y-TZP) with resin cements. Non-thermal plasma (NTP) may be an alternative for the clinical problems related to adhesion. The purpose of the present study was to characterize the surface of Y-TZP exposed to methane (CH4) NTP or coated with a layer of primer for metal alloys and the association between the two methods and to evaluate the effect of NTP treatment on bond strength between Y-TZP and two resin cements. A total of 235 Y-TZP discs (8×2mm) were distributed into five groups: Co (no surface treatment), Pr (primer), NTP (methane plasma), Pr+NTP and NTP+Pr...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28024583/reconciling-in-vivo-and-in-vitro-kinetics-of-the-polymorphic-transformation-in-zirconia-toughened-alumina-for-hip-joints-i-phenomenology
#12
B Sonny Bal, Wenliang Zhu, Matteo Zanocco, Elia Marin, Nobuhiko Sugano, Bryan J McEntire, Giuseppe Pezzotti
Exploitation of the toughening effect induced by polymorphic phase transformation of zirconia in zirconia-toughened alumina (ZTA) requires the composite being properly designed and carefully manufactured. A sound algorithm for predicting phase stability along with strict control over manufacturing steps are required in order to prevent possible in vivo surface degradation or implant fracture. This paper is the first in a series of three monographs, which aim at: (i) statistically comparing the in vitro/in vivo phenomenology of surface-metastability for currently marketed ZTA femoral heads; (ii) refining pre-existing theoretical models for predicting in vivo zirconia phase metastability via the use of accelerated in vitro ageing experiments; and, (iii) providing a rationale for the mechanism(s) involved with the observed in vivo surface metastability...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28019096/zro2-tio2-electron-collection-layer-for-efficient-meso-superstructured-hybrid-perovskite-solar-cells
#13
Mario Alejandro Mejía Escobar, Sandeep Pathak, Jiewei Liu, Henry J Snaith, Franklin Jaramillo
Since the first reports of efficient organic-inorganic perovskite solar cells in 2012, an explosion of research activity has emerged around the world, which has led to a rise in the power conversion efficiencies (PCEs) to over 20%. Despite the impressive efficiency, a key area of the device, which remains sub-optimal is the electronic electron extraction layer and its interface with the photoactive perovskite. Here, we implement an electron collection "bi-layer" composed of a thin layer of zirconia coated with titania, siting upon the transparent conductive oxide fluorine doped tin oxide (FTO)...
December 26, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28018566/interfacial-modulus-mapping-of-layered-dental-ceramics-using-nanoindentation
#14
Antonios L Theocharopoulos, Andrew J Bushby, Ken My P'ng, Rory M Wilson, K Elizabeth Tanner, Michael J Cattell
PURPOSE: The aim of this study was to test the modulus of elasticity (E) across the interfaces of yttria stabilized zirconia (YTZP) / veneer multilayers using nanoindentation. MATERIALS AND METHODS: YTZP core material (KaVo-Everest, Germany) specimens were either coated with a liner (IPS e.max ZirLiner, Ivoclar-Vivadent) (Type-1) or left as-sintered (Type-2) and subsequently veneered with a pressable glass-ceramic (IPS e.max ZirPress, Ivoclar-Vivadent). A 5 µm (nominal tip diameter) spherical indenter was used with a UMIS CSIRO 2000 (ASI, Canberra, Australia) nanoindenter system to test E across the exposed and polished interfaces of both specimen types...
December 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28018562/effect-of-cement-type-on-the-color-attributes-of-a-zirconia-ceramic
#15
Farhad Tabatabaian, Maliheh Habib Khodaei, Mahshid Namdari, Minoo Mahshid
PURPOSE: This in vitro study evaluated the effects of four different cements on the color attributes of a zirconia ceramic. MATERIALS AND METHODS: 40 zirconia ceramic disk specimens (0.5 mm thickness, 10 mm diameter, 0.1 mm cement space) were fabricated by a computer-aided design and computer-aided manufacturing system. The specimens were divided into 4 groups of 10 specimens and cemented to composite substrates using four different cements including: Glass Ionomer, Panavia F2...
December 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28018561/comparison-of-the-fit-accuracy-of-zirconia-based-prostheses-generated-by-two-cad-cam-systems
#16
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/28006713/influence-of-sodalite-zeolite-infiltration-on-the-coefficient-of-thermal-expansion-and-bond-strength-of-all-ceramic-dental-prostheses
#17
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/28005570/in-vitro-microbiological-analysis-of-bacterial-seal-in-hybrid-zirconia-abutment-tapered-connection
#18
Maurício Marcelo Harlos, Thiago Bezerra da Silva, Daiane C Peruzzo, Marcelo H Napimoga, Julio Cesar Joly, Elizabeth F Martinez
PURPOSE: The aim of this study was to evaluate the bacterial seal at the implant-hybrid zirconia abutment interface and Morse taper-type connections through in vitro microbiological analysis. MATERIALS AND METHODS: Sixteen implants and their respective abutments were divided into 3 groups: test (10 sets), positive control (3 sets), and negative control (3 sets). In the test group, 10 implants were contaminated with Escherichia coli using a sterile inoculating loop to the inner portion of the implants, followed by torque application to the abutment (30 N·cm)...
December 21, 2016: Implant Dentistry
https://www.readbyqxmd.com/read/28000765/dipentaerythritol-penta-acrylate-phosphate-an-alternative-phosphate-ester-monomer-for-bonding-of-methacrylates-to-zirconia
#19
Ying Chen, Franklin R Tay, Zhicen Lu, Chen Chen, Mengke Qian, Huaiqin Zhang, Fucong Tian, Haifeng Xie
The present work examined the effects of dipentaerythritol penta-acrylate phosphate (PENTA) as an alternative phosphate ester monomer for bonding of methacrylate-based resins to yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and further investigated the potential bonding mechanism involved. Shear bond strength testing was performed to evaluate the efficacy of experimental PENTA-containing primers (5, 10, 15, 20 or 30 wt% PENTA in acetone) in improving resin-Y-TZP bond strength. Bonding without the use of a PENTA-containing served as the negative control, and a Methacryloyloxidecyl dihydrogenphosphate(MDP)-containing primer was used as the positive control...
December 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/28000280/modern-implant-dentistry-based-on-osseointegration-50%C3%A2-years-of-progress-current-trends-and-open-questions
#20
REVIEW
Daniel Buser, Lars Sennerby, Hugo De Bruyn
In the 1960s and 1970s, implant-supported prostheses based on subperiosteal or blade implants had a poor reputation because of questionable clinical outcomes and lack of scientific documentation. The change to a scientifically sound discipline was initiated by the two scientific pioneers of modern implant dentistry, Professor P. I. Brånemark from the University of Gothenburg in Sweden and Professor André Schroeder from the University of Bern in Switzerland. Together with their teams, and independently of each other, they laid the foundation for the most significant development and paradigm shift in dental medicine...
February 2017: Periodontology 2000
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