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Zirconia

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https://www.readbyqxmd.com/read/29150133/effect-of-coloring-and-sintering-on-the-translucency-and-biaxial-strength-of-monolithic-zirconia
#1
Nazmiye Sen, Ibrahim Bülent Sermet, Sevki Cinar
STATEMENT OF PROBLEM: The influences of coloring and sintering procedures on the optical and mechanical properties of monolithic zirconia have not been thoroughly investigated. PURPOSE: The purpose of this in vitro study was to investigate the effects of the coloring procedure and of varying final sintering temperatures on the translucency parameter (TP) and biaxial flexural strength (BFS) of monolithic zirconia. MATERIAL AND METHODS: Disk-shaped specimens (N=210) of 2 different monolithic zirconia brands (Vita YZ HT(White) [VYZa]; Vita YZ HT(Color) A2 [VYZb]; Prettau Zirkonzahn [PZ]; Prettau Anterior Zirkonzahn [PZA]) with a diameter of 15 mm and a thickness of 1...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29143391/an-all-zirconia-crown-discovered-2-years-following-aspiration
#2
Han Qin, Hai Qing, Na Hu, Hui Zhu, Jian Wang
Accidental aspiration or ingestion can occur in dental treatment, as most procedures are performed with the patient in a supine position or semi-recumbent position. Aspiration of foreign bodies commonly causes acute symptoms such as violent coughing, choking, and dyspnea; however, if foreign bodies are stuck distally to the lower lobe bronchi or the bronchus intermedius, acute presentation can be rare. This clinical report documents a 68-year-old male patient who accidentally aspirated an all-zirconia crown during the try-in procedure...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29142648/comparison-of-the-optical-properties-of-pre-colored-dental-monolithic-zirconia-ceramics-sintered-in-a-conventional-furnace-versus-a-microwave-oven
#3
Hee-Kyung Kim, Sung-Hun Kim
PURPOSE: The purpose of this study was to compare the optical properties of pre-colored dental monolithic zirconia ceramics of various thicknesses sintered in a microwave and those in a conventional furnace. MATERIALS AND METHODS: A2-shade of pre-colored monolithic zirconia ceramic specimens (22.0 mm × 22.0 mm) in 3 thickness groups of 0.5, 1.0, and 1.5 mm were divided into 2 subgroups according to the sintering methods (n=9): microwave and conventional sintering...
October 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/29140375/plasma-of-argon-increases-cell-attachment-and-bacterial-decontamination-on-different-implant-surfaces
#4
Luigi Canullo, Tullio Genova, Hom-Lay Wang, Stefano Carossa, Federico Mussano
PURPOSE: This in vitro study tested the effects of argon atmospheric pressure dielectric barrier discharge (APDBD) on different implant surfaces with regard to physical changes, bacterial decontamination, and osteoblast adhesion. MATERIALS AND METHODS: Seven hundred twenty disks with three different surface topographies-machined (MAC), titanium plasma-sprayed (TPS), and zirconia-blasted and acid-etched (ZRT)-were tested in this experiment. Bacterial adhesion tests were performed repeatedly on a simplified biofilm of Streptococcus mitis...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29140369/wear-at-the-implant-abutment-interface-of-zirconia-abutments-manufactured-by-three-cad-cam-systems
#5
Ana Luiza Pinheiro Tannure, Alfredo Gonçalves Cunha, Luiz Antônio Borges Junior, Laís Regiane da Silva Concílio, Ana Christina Claro Neves
PURPOSE: To evaluate the changes in the external-hexagon surface of the titanium (Ti) implant before and after mechanical cycling, when coupled with zirconia (Zr) abutments (A) manufactured by three computer-aided design/computer-aided manufacturing (CAD/CAM) systems (Neodent Digital, Zirkonzahn, and AmannGirrbach) and the ZrTi abutment manufactured by Neodent. MATERIALS AND METHODS: Four groups were formed (n = 6): titanium implant with Zr AmannGirrbach abutment (AZrAG), with Zr Zirkonzahn abutment (AZrZ), with Zr Neodent abutment (AZrN), and with Zr abutment with infrastructure in Ti Neodent (AZrTiN)...
November 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/29137761/ultrasound-assisted-surface-treatment-of-zro2-with-bsa-and-incorporating-in-pvc-to-improve-the-properties-of-the-obtained-nanocomposites-fabrication-and-characterization
#6
Shadpour Mallakpour, Zahra Hajjari
This paper describes the preparation of poly(vinyl chloride) (PVC) nanocomposites (NCs) reinforced with modified zirconia (ZrO2) nanoparticles (NPs). The ZrO2 NPs were defined as efficient filler for PVC NCs. For achieving the best dispersion and improvement of properties, the surface of ZrO2 NPs was modified by Bovine Serum Albumin (BSA). Carboxylic acids and amines are important functional groups of BSA which handle the grafting BSA on the surface of ZrO2 NPs. The PVC/ZrO2-BSA NCs were fabricated by incorporation of various amounts of the ZrO2-BSA NPs (3, 6 and 9wt%) into PVC matrix...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29130030/a-review-of-engineered-zirconia-surfaces-in-biomedical-applications
#7
Ling Yin, Yoshitaka Nakanishi, Abdur-Rasheed Alao, Xiao-Fei Song, Jaafar Abduo, Yu Zhang
Zirconia is widely used for load-bearing functional structures in medicine and dentistry. The quality of engineered zirconia surfaces determines not only the fracture and fatigue behaviour but also the low temperature degradation (ageing sensitivity), bacterial colonization and bonding strength of zirconia devices. This paper reviews the current manufacturing techniques for fabrication of zirconia surfaces in biomedical applications, particularly, in tooth and joint replacements, and influences of the zirconia surface quality on their functional behaviours...
2017: Procedia CIRP
https://www.readbyqxmd.com/read/29128350/biomechanical-behavior-of-adhesive-cement-layer-and-periodontal-tissues-on-the-restored-teeth-with-zirconia-rbfdps-using-three-kinds-of-framework-design-3d-fea-study
#8
Ayana Uraba, Reina Nemoto, Kosuke Nozaki, Tasuku Inagaki, Satoshi Omori, Hiroyuki Miura
PURPOSE: To investigate stress and strain concentrations on resin-bonded fixed dental prostheses (RBFDPs) frameworks of different design using finite element analysis. METHODS: A human dry skull was scanned and models were produced using three-dimensional printer. After abutment preparation, three frameworks, including a three-unit RBFDP, and two-unit cantilevered RBFDPs using #21 and #23 for the abutment tooth, were fabricated. Scanned data were subtracted to define boundary of each structure...
November 8, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29126690/evaluation-of-peri-implant-bone-levels-and-soft-tissue-dimensions-around-zirconia-implants-a-three-year-follow-up-study
#9
K Kniha, K A Schlegel, H Kniha, A Modabber, F Hölzle, K Kniha
The aim of this study was to measure bone levels around zirconia implants during follow-up of up to 3 years. Additionally, the effect of clinical contact point positions on the papilla deficit was evaluated. Eighty-one patients with 105 zirconia implants were examined at the 3-year follow-up. Bone levels were measured on the date of implant placement and at 3 months, 1year, and 3 years thereafter. Distances between the first bone-implant contact and the contact point of the crowns and between the bone level at the adjacent tooth and the contact point of the crowns were assessed...
November 7, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29125746/selective-activation-of-methane-on-single-atom-catalyst-of-rhodium-dispersed-on-zirconia-for-direct-conversion
#10
Yongwoo Kwon, Tae Yong Kim, Gihun Kwon, Jongheop Yi, Hyunjoo Lee
Direct methane conversion into value-added products becomes more important. Due to inertness of methane, cleaving the first C-H bond has been very difficult requiring high reaction temperature on the heterogeneous catalysts. Once the first C-H bond becomes activated, the remaining C-H bonds are successively dissociated on the metal surface, hindering the direct methane conversion into chemicals. Here, a single-atom Rh catalyst dispersed on ZrO2 surface has been synthesized and used for selective activation of methane...
November 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29122237/osseointegration-of-zirconia-dental-implants-in-animal-investigations-a-systematic-review-and-meta-analysis
#11
REVIEW
Stefano Pieralli, Ralf-Joachim Kohal, Emilia Lopez Hernandez, Sam Doerken, Benedikt Christopher Spies
OBJECTIVE: To determine the osseointegration rate of zirconium dioxide (ZrO2) dental implants in preclinical investigations. DATA: Data on the osseointegration rate was extracted considering the bone to implant contact (BIC), removal torque analysis (RTQ) and push-in tests. Meta analyses were conducted using multilevel multivariable mixed-effects linear regression models. The Šidák method was used in case of multiple testing. SOURCES: An electronic screening of the literature (MEDLINE/Pubmed, Cochrane Library and Embase) and a supplementary manual search were performed...
November 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29116295/effect-of-ceramic-thickness-grinding-and-aging-on-the-mechanical-behavior-of-a-polycrystalline-zirconia
#12
Rodrigo Diniz Prado, Gabriel Kalil Rocha Pereira, Marco Antonio Bottino, Renata Marques de Melo, Luiz Felipe Valandro
Monolithic restorations of Y-TZP have been recommended as a restorative alternative on prosthetic dentistry as it allows a substantial reduction of ceramic thickness, which means a greater preservation of tooth structure. However, the influence of grinding and aging when using a thinner layer of the material is unclear. This investigation aimed to evaluate and compare the effects of ceramic thickness (0.5 mm and 1.0 mm), grinding and aging (low-temperature degradation) on the mechanical behavior and surface characteristics of a full-contour Y-TZP ceramic...
November 6, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/29116000/effect-of-mouthrinses-on-color-stability-of-monolithic-zirconia-and-feldspathic-ceramic-an-in-vitro-study
#13
Reza Derafshi, Hooman Khorshidi, Mohamadhasan Kalantari, Ilyad Ghaffarlou
BACKGROUND: Patients susceptible to periodontal disease and dental caries, including those who undergo fixed prosthodontic treatments use chemical plaque control agents. However, these mouthrinses may result in adverse effects such as discoloration of the restorative materials. The aim of this study was to compare the color stability of monolithic zirconia and feldspathic porcelain after immersion in two different mouthrinses: 0.2% Chlorhexidine digluconate (CHX), or Listerine®. Color change was evaluated by color spectrophotometer and according to the Commission Internationale de l'Eclairage (CIELab) system...
November 7, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/29109822/the-effect-of-various-types-of-mechanical-and-chemical-preconditioning-on-the-shear-bond-strength-of-orthodontic-brackets-on-zirconia-restorations
#14
Jihun Kim, Chanhee Park, Jeong-Sub Lee, Jungho Ahn, Yoon Lee
The purpose of this study was to investigate the combined effect of mechanical and chemical treatments on the shear bond strength (SBS) of metal orthodontic brackets on zirconia restoration. The zirconia specimens were randomly divided into 12 groups (n = 10) according to three factors: AL (Al2O3) and CO (CoJet™) by sandblasting material; SIL (silane), ZPP (Zirconia Prime Plus), and SBU (Single Bond Universal) by primer; and N (not thermocycled) and T (thermocycled). The specimens were evaluated for shear bond strength, and the fractured surfaces were observed using a stereomicroscope...
2017: Scanning
https://www.readbyqxmd.com/read/29104596/deposition-of-crystalline-hydroxyapatite-nanoparticles-on-y-tzp-ceramic-a-potential-solution-to-enhance-bonding-characteristics-of-y-tzp-ceramics
#15
Abbas Azari, Sakineh Nikzad Jamnani, Arash Yazdani, Faezeh Atri, Vania Rasaie, Abbas Fazel Anvari Yazdi
Objectives: Many advantages have been attributed to dental zirconia ceramics in terms of mechanical and physical properties; however, the bonding ability of this material to dental structure and/or veneering ceramics has always been a matter of concern. On the other hand, hydroxyapatite (HA) shows excellent biocompatibility and good bonding ability to tooth structure, with mechanically unstable and brittle characteristics, that make it clinically unacceptable for use in high stress bearing areas...
March 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29101546/retention-force-of-removable-partial-dentures-with-different-double-crowns
#16
Christin Arnold, Jeremias Hey, Jürgen M Setz, Arne F Boeckler, Ramona Schweyen
OBJECTIVES: The aim of the study was to compare the retentive behaviors of double crowns with different designs and material compositions before and after artificial aging. MATERIALS AND METHODS: Six pairs of double crowns were fabricated: telescopic crowns 0° made of high-noble metal (group A) or non-precious metal (group B), telescopic zirconia copings with secondary crowns made of electroplated gold 2° (group C), crowns with friction pins 2° made of non-precious metal (group D) or zirconia (group E), and conical crowns 6° made of high-noble metal (group F)...
November 3, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/29099373/fluorination-of-zirconia-surfaces-impairs-bonding-to-resin-cement
#17
Leandro Tolomelli Carraro Franco, Marina Amaral, Rafael Pino Vitti, Alecsandro Moura Silva, Laís Regiane Silva-Concílio, Ana Christina Claro Neves
The aim of this study was to evaluate the fluorination of a zirconia surface as an alternative treatment for bonding to resin cement; the null hypothesis was that fluorination would not improve adhesion values. Four different surface treatments were performed on the surface of yttria-stabilized tetragonal zirconia polycrystal discs (N = 80): Ctrl (control), no treatment; SB, sandblasting with 50-μm alumina particles; SBS, sandblasting with 30-μm silica-modified alumina particles and application of silane; and SF, fluorination with sulfur hexafluoride-containing plasma...
November 2017: General Dentistry
https://www.readbyqxmd.com/read/29098259/-clinical-efficacy-and-effects-of-cad-cam-zirconia-all-ceramic-crown-and-metal-ceramic-crown-restoration-on-periodontal-tissues
#18
Xin-Yi Xu, Yin-Lian Zhang, Fang-Hui Geng
PURPOSE: To investigate the clinical efficacy and effects of CAD/CAM zirconia all-ceramic crown, cobalt-chromium alloy and silver-palladium alloy porcelain-fused-to-metal crown restorations on periodontal tissues. METHODS: Forty-nine teeth with crowns in 46 patients were randomly assigned into CAD/CAM zirconia all-ceramic crown group, cobalt-chromium alloy porcelain-fused-to-metal crown group and silver-palladium alloy porcelain-fused-to-metal crown group. The amounts of GCF, TNF-α and IL-6 were analyzed before and 12 months after restorations, and the clinical efficacy was evaluated...
June 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/29098160/micro-raman-vibrational-identification-of-10-mdp-bond-to-zirconia-and-shear-bond-strength-analysis
#19
Diego Martins De-Paula, Alessandro D Loguercio, Alessandra Reis, Natasha Marques Frota, Radamés Melo, Kumiko Yoshihara, Victor Pinheiro Feitosa
So far, there is no report regarding the micro-Raman vibrational fingerprint of the bonds between 10-methacryloyloxy-decyl dihydrogen phosphate (10-MDP) and zirconia ceramics. Thus, the aim of this study was to identify the Raman vibrational peaks related to the bonds of 10-MDP with zirconia, as well as the influence on microshear bond strength. Micro-Raman spectroscopy was employed to assess the vibrational peak of 10-MDP binding to zirconia. Microshear bond strength of the dual-cure resin cement to zirconia with the presence of 10-MDP in composition of experimental ceramic primer and self-adhesive resin cement was also surveyed...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29097830/speed-sintering-translucent-zirconia-for-chairside-one-visit-dental-restorations-optical-mechanical-and-wear-characteristics
#20
Marina R Kaizer, Petra C Gierthmuehlen, Mateus Bf Dos Santos, Sergio S Cava, Yu Zhang
The fabrication of zirconia dental restorations is a time-consuming process due to traditional slow sintering schemes; zirconia (Y-TZP) produced by these conventional routes are predominantly opaque. Novel speed sintering protocols have been developed to meet the demand for time and cost effective chairside CAD/CAM-produced restorations, as well as to control ceramic microstructures for better translucency. Although the speed sintering protocols have already been used to densify dental Y-TZP, the wear properties of these restorations remain elusive...
October 1, 2017: Ceramics International
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