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Dental And Zirconia

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https://www.readbyqxmd.com/read/30102765/evaluation-of-oral-microbial-corrosion-on-the-surface-degradation-of-dental-implant-materials
#1
Danyal A Siddiqui, Lidia Guida, Sathyanarayanan Sridhar, Pilar Valderamma, Thomas G Wilson, Danieli C Rodrigues
BACKGROUND: Titanium (Ti) dominates as the material of choice for dental implant systems. Recently, titanium-zirconium alloy (TiZr) and zirconia (ZrO₂ ) have emerged as alternative materials due to higher mechanical strength and lower corrosion susceptibility. Oral pathogenic bacteria can colonize Ti surfaces, leading to surface degradation, which has yet to be investigated on TiZr and ZrO2 . The aim of this study was to compare in vitro oral bacterial adhesion and subsequent surface degradation on commercial Ti, TiZr, and ZrO2 implants...
August 13, 2018: Journal of Periodontology
https://www.readbyqxmd.com/read/30085483/effect-of-zirconia-pigmentation-on-translucency
#2
I Gomes, L P Lopes, M Fonseca, J Portugal
PURPOSE: the aim of this study was to investigate the effect of shading on translucency and mean grain size of three Zirconia systems (Lava Frame, Ice Zirkon Translucent and Prettau Zirkon). MATERIALS AND METHODS: specimens pigmented in A1, A4 and a non-pigmented specimen was evaluated with Scanning Electron Microscopy and spectrophotometery. RESULTS: the transmittance ranged between 0.18 and 0.52, in Ice Zirkon Translucent A4 and Prettau Zircon non-pigmented, respectively...
August 7, 2018: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/30074223/biomechanical-evaluation-of-nano-zirconia-coatings-on-ti-6al-7nb-implant-screws-in-rabbit-tibias
#3
Thekra I Hamad, Abdalbseet A Fatalla, Amer Subhi Waheed, Zena G M Azzawi, Ying-Guang Cao, Ke Song
The clinical success of dental implants can be improved by achieving optimum implant properties, such as their biomechanical and surface characteristics. Nano-structured coatings can play an important role in improving the implant surface. The purpose of the present study was to determine the most appropriate conditions for electrophoretic deposition (EPD) of nano-zirconia coatings on Ti-6Al-7Nb substrates and to evaluate the structural and biomechanical characteristics of these deposited coatings on the dental implants...
June 2018: Current medical science
https://www.readbyqxmd.com/read/30064471/sphere-plane-methodology-to-evaluate-the-wear-of-titanium-of-dental-implants-a-research-proposal
#4
Teresa Almeida Mendes, João Caramês, Luís Pires Lopes, Amílcar Lopes Ramalho
OBJECTIVE: Titanium is the most commonly used material to manufacture dental implants and abutments. Recently, zirconia abutments have been manufactured with better aesthetic properties. However, zirconia abutments are harder than titanium implants; therefore, they could wear the implant surface. Therefore, this article aims to describe a sphere-plane system that can be used to assess the wear that different abutment materials cause in the titanium of dental implants when submitted to cyclic loading...
July 31, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/30057707/the-effect-of-z-primer-on-the-shear-bond-strength-of-zirconia-ceramic-to-dentin-in-vitro
#5
Anahit Afrasiabi, Elahe Mostajir, Niusha Golbari
Background: One of the major limitations of zirconia ceramic is the difficulty to adhere to dental. Said adhesion improves the marginal sealing of the restoration, minimizing microleakage. According to the limitation of zirconia ceramic bonding, zirconia primer enhances bond strengths to Zirconia, Alumina and Metal substrates. Purpose: the aim of the current study was to determine effect of Z-primer on the shear bond strength of zirconia ceramic to dentin. Material and Methods: 28 newly extracted intact premolars and divided into 4 groups (n=7)...
July 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/30046484/solid-electrolytes-based-on-1-x-y-zro-2-x-mgo-y-cao-ternary-system-preparation-characterization-ionic-conductivity-and-dielectric-properties
#6
Nazli Zeeshan, Rafiuddin
Different composition of composite material of zirconium dioxide co-doped with magnesium oxide [MgO(x)] and calcium oxide [CaO(y)] according to the general molecular formula {1 - (x + y)}ZrO2 -(x)MgO-(y)CaO were prepared by co-precipitation method and characterized by different techniques, such as XRD, FTIR, TG-DTA, and SEM. Co-doping was conducted to enhance the ionic conductivity, as mixed system show higher conductivity than the single doped one. Arrhenius plots of the conductance revealed that the co-doped composition "6Mg3Ca" has a higher conductivity with a minimum activation energy of 0...
January 2018: Journal of Advanced Research
https://www.readbyqxmd.com/read/30037692/randomized-controlled-clinical-trial-of-digital-and-conventional-workflows-for-the-fabrication-of-zirconia-ceramic-posterior-fixed-partial-dentures-part-ii-time-efficiency-of-cad-cam-versus-conventional-laboratory-procedures
#7
Sven Mühlemann, Goran I Benic, Vincent Fehmer, Christoph H F Hämmerle, Irena Sailer
STATEMENT OF PROBLEM: Clinical trials are needed to evaluate the digital and conventional fabrication technology for providing fixed partial dentures (FPDs). PURPOSE: The purpose of the second part of this clinical study was to compare the laboratory production time for tooth-supported, 3-unit FPDs by means of computer-aided design and computer-aided manufacturing (CAD-CAM) systems and a conventional workflow. In addition, the quality of the 3-unit framework of each treatment group was evaluated clinically...
July 20, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/30028052/effect-of-aging-time-and-thickness-on-low-temperature-degradation-of-dental-zirconia
#8
Yongxiang Zhuang, Ziyuan Zhu, Ting Jiao, Jian Sun
PURPOSE: To evaluate the influence of specimen thickness and low-temperature degradation (LTD) on yttrium-stabilized tetragonal zirconia polycrystals (Y-TZP). MATERIALS AND METHODS: Thin discs of Y-TZP from four manufacturers were sintered according to each manufacturer's recommendations, cut into 23 mm (length) × 4 mm (width) × 0.8 mm/1.5 mm (thickness) specimens, artificially aged under standard autoclave sterilization conditions (34°C at 0.2 MPa for 10 and 20 hours), and finally ground and polished...
July 20, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/30026892/effect-of-surface-modification-on-viability-of-l929-cells-on-zirconia-nanocomposite-substrat
#9
Moluk Aivazi, Mohammadhossein Fathi, Farahnaz Nejatidanesh, Vajihesadat Mortazavi, Batoul Hashemi Beni, Jukka Pekka Matinlinna
Introduction: Zirconia bioceramic can be considered for metallic replacement in dental implant applications. A proper method of surface modification may promote better osseointegration. Methods: In study evaluated viability of fibroblast cell following surface treatment. Therefore, viability L929 cells were characterized using MTT assay and scanning electron microscopy. Results: The viability assessment determined significant differences A-Y-TZP20 without surface treatment as compared to laser surface treatment (B), laser surface treatment + hydroxyapatiteyttrium stabilized tetragonal zirconia nanocomposite coat (C) and control...
2018: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/30020799/implant-abutment-biomechanics-and-material-selection-for-predictable-results
#10
Steve Hurson
Change in crestal bone height and volume around endosseous dental implants is a complex issue involving interactions among many variables such as surgical approach, patient health, volume of hard and soft tissues, and implant configuration. Establishing and maintaining a soft-tissue seal around transmucosal abutments on bone-level implants or on the collar of one-stage tissue-level implants is paramount to maintaining crestal bone height, and failing to do so will result in apical migration of the soft tissue onto the implant...
July 2018: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/30017167/trueness-analysis-of-zirconia-crowns-fabricated-with-3-dimensional-printing
#11
Weina Wang, Hai Yu, Yifan Liu, Xinlei Jiang, Bo Gao
STATEMENT OF PROBLEM: The primary manufacturing method of zirconia ceramic crowns is computer-aided design and computer-aided manufacture (CAD-CAM), but a disadvantage of this technique is material waste. Three-dimensional (3D) printing, which has been recently introduced into dentistry, has improved the processing of polymers and metals, but not yet of ceramic crowns. PURPOSE: The purpose of this in vitro study was to evaluate the 3D trueness of zirconia crowns fabricated by 3D printing to investigate the potential application of this technology in dental ceramic restorations...
July 13, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/30015816/-a-phd-completed-innovations-in-restorative-dentistry-necessary-or-superfluous
#12
U Schepke
Restorative dentists are faced with a dilemma: they needs to be aware of the most recent developments in order to be able to offer state-of-the-art care but they also have to be able to identify which of the many innovations are superfluous. In this doctoral dissertation the focus was on the role of digital production and procedures in restorative dentistry, and in oral implantology in particular. The variety of studies performed revealed that patients prefer to have impressions taken digitally rather than with dental impression putty and that digital impressions can be taken more quickly...
July 2018: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/30006275/mechanical-reliability-of-dental-grade-zirconia-after-laser-patterning
#13
E Roitero, M Anglada, F Mücklich, E Jiménez-Piqué
The aim of this work is to test the mechanical properties of dental zirconia surfaces patterned with Nd:YAG laser interference (λ = 532 nm and 10 ns pulse). The laser treatment produces an alteration of the topography, engraving a periodic striped pattern. Laser-material interaction results mainly in thermal effects producing microcracking, phase transformation and texturization. The role of such microstructural modifications and collateral damage on the integrity and mechanical performances has been assessed...
October 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/30006227/differences-in-micromorphology-of-the-implant-abutment-junction-for-original-and-third-party-abutments-on-a-representative-dental-implant
#14
George Fokas, Li Ma, Vasilios Chronopoulos, Martin Janda, Nikos Mattheos
STATEMENT OF PROBLEM: Evidence for micromorphology and precision of fit of third-party prosthetic components compared with the original manufacturer's components is lacking. PURPOSE: The purpose of this in vitro pilot study was to evaluate the micromorphological differences among different commercial brands of zirconia, titanium, and gold abutments for dental implants in terms of tight surface contact. MATERIAL AND METHODS: The following abutments (n=3 per type) were preloaded on Straumann Bone Level implants according to the manufacturer's instructions for zirconia (Zr, Zr2, Zr3), titanium (Ti and Ti2), and gold (Gold 1, Gold 2)...
July 10, 2018: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29998938/hard-and-soft-tissue-responses-to-implant-made-of-three-different-materials-with-microgrooved-collar-in-a-dog-model
#15
Kensuke Igarashi, Ken Nakahara, Eizaburo Kobayashi, Fumihiko Watanabe, Maiko Haga-Tsujimura
The objective of the present study was to assess hard and soft tissue around dental implants made of three different materials with microgrooves on the collar surface. Microgrooved implants were inserted in the mandibles of five male beagles. Implants were made of three kinds of material; titanium (Ti), yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) and ceria partially stabilized zirconia/alumina nanocomposite (Ce-TZP/Al2 O3 ). The animals were euthanatized at three months after implantation, and harvested tissue was analyzed by means of histology...
July 12, 2018: Dental Materials Journal
https://www.readbyqxmd.com/read/29986287/effect-of-grinding-on-subsurface-modifications-of-pre-sintered-zirconia-under-different-cooling-and-lubrication-conditions
#16
P Suya Prem Anand, N Arunachalam, L Vijayaraghavan
Pre-sintered zirconia is preferred as a restoration material in dental applications due to its excellent strength and fracture toughness. When abrasive processes were used to obtain the required shape of (Y-TZP) yttria-stabilized tetragonal pre-sintered zirconia, it resulted in material strength degradation in the presence of coolant. Therefore, experiments were carried out on pre-sintered zirconia with diamond grinding wheel to evaluate the performance of cooling conditions such as dry, wet and minimum quantity lubrication (MQL)...
October 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29985324/oral-biofilm-formation-on-different-materials-for-dental-implants
#17
Thalisson S O Silva, Alice R Freitas, Marília L L Pinheiro, Cássio do Nascimento, Evandro Watanabe, Rubens F Albuquerque
Dental implants and their prosthetic components are prone to bacterial colonization and biofilm formation. The use of materials that provides low microbial adhesion may reduce the prevalence and progression of peri-implant diseases. In view of the oral environment complexity and oral biofilm heterogeneity, microscopy techniques are needed that can enable a biofilm analysis of the surfaces of teeth and dental materials. This article describes a series of protocols implemented for comparing oral biofilm formation on titanium and ceramic materials for prosthetic abutments, as well as the methods involved in oral biofilms analyses at the morphological and cellular levels...
June 24, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29983377/a-systematic-review-and-meta-analysis-on-the-clinical-outcome-of-zirconia-implant-restoration-complex
#18
REVIEW
Mireia Haro Adánez, Hironobu Nishihara, Wael Att
PURPOSE: This systematic review evaluates the clinical outcome of zirconia implant-associated survival and success rates, marginal bone loss, and implant-restoration complex integrity. STUDY SELECTION: Using the preferred reporting items for systematic reviews and meta-analysis (PRISMA) guidelines, studies including ≥10 patients restored with zirconia implants supporting single crowns (SCs) or fixed dental prostheses (FDPs) prior to January 2017 were identified...
July 5, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29975849/a-functionally-graded-picn-material-for-biomimetic-cad-cam-blocks
#19
M Eldafrawy, J F Nguyen, A K Mainjot, M J Sadoun
The objective of this study was to introduce a functionally graded (FG) polymer-infiltrated ceramic network (PICN) block, characterized by a gradient of mechanical properties, as a biomimetic material for computer-aided design and manufacturing (CAD-CAM) prostheses. FG-PICN blocks were manufactured from a slurry of glass-ceramic powder, which was subsequently centrifuged and sintered. The ceramic network was infiltrated with urethane dimethacrylate and polymerized under high temperature-pressure. Blocks were sectioned into 9 layers, and each layer was subsequently cut into 3 samples...
July 1, 2018: Journal of Dental Research
https://www.readbyqxmd.com/read/29972909/-effect-of-sandblasting-on-bending-strength-and-subcritical-crack-growth-of-the-dental-zirconia-ceramics
#20
X Gong, X Y Zhao, C B Zhang, S B Li, Y L Wu, B Wu
Objective: To evaluate the effect of sandblasting on bending strength and subcritical crack growth (SCG) under cyclic loading of yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramics. Methods: After being polished, sixty bar-shaped specimens of Y-TZP (Wieland zirconia ceramics) were assigned to two groups ( n= 30) according to the random number table, the sandblasting group (SG) which was treated with sandblasting and the control group (CG) which remained untouched. In each group, half of the specimens ( n= 15) were subjected to bending strength test, and the results were examined by Weibull statistics and analyzed with ANOVA...
July 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
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