5,300 results match your criteria zirconium dioxide


Influence of time and hydration (ageing) on flexural strength of Yttrium stabilized Zirconia polycrystals (Y-TZP) fabricated with different CAD-CAM Systems.

Pak J Med Sci 2021 May-Jun;37(3):833-839

Tariq Abduljabbar. Department of Prosthetic Dental Sciences, Research Chair for Biological Research in Dental Health, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.

Objectives: To evaluate the effect of time and hydration (ageing) on flexural strength of yttrium-stabilized zirconia polycrystals (Y-TZP) zirconia fabricated from three different materials.

Methods: This in-vitro study was performed from June to September 2019. Y-TZP bars, measuring 2 x 3 x 20 mm were prepared and sintered from three different materials, Group-1: LAVA™ Zirconia (3M ESPE, US) (control) Group-2: Vita In-Ceram YZ (VITA, Germany) and Group-3: Aadva™ Zirconia (Zr) (GC Advanced technologies Inc. Read More

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In Vitro Assessment of Artificial Aging on the Antifungal Activity of PMMA Denture Base Material Modified with ZrO Nanoparticles.

Int J Dent 2021 13;2021:5560443. Epub 2021 May 13.

Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, P.O. Box 1982, Dammam 41441, Saudi Arabia.

The antifungal effect of zirconium dioxide nanoparticles (ZrONPs) incorporated into denture base material has been inadequately investigated; additionally, to the authors' knowledge, no studies have assessed the influence of artificial aging on the antifungal activity of these particles. . Heat-polymerized acrylic resin disks were fabricated and divided into four groups (0%, 1%, 2. Read More

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Prosthetically Driven Computer-Guided One-Piece Zirconia Implant Placement and Restoration Replacing Missing Central Incisor: A Case Report.

J Oral Implantol 2021 Jun 5. Epub 2021 Jun 5.

King Abdulaziz University Faculty of Dentistry Assistant professor Periodontics 5148 halban SAUDI ARABIA Jeddah Makkah 21362 King Abdulaziz University Faculty of Dentistry.

Currently, the gold standard materials of choice for dental implants are the commercially pure titanium. However, these materials may have suboptimal anterior esthetic outcome due to the dark grayish burnout. To enhance the esthetic outcomes, zirconium dioxide materials, with reported long-term success in medical uses and with its tooth-like color, was introduced as a dental implants material. Read More

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Stress distribution of esthetic posts in the restored maxillary central incisor: Three-dimensional finite-element analysis.

Dent Res J (Isfahan) 2021 23;18:10. Epub 2021 Feb 23.

Department of Prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran.

Background: Glass fiber posts, along with their esthetic properties, may have a better stress distribution than cast posts, Therefore, the aim of the present study was to investigate the effect of glass fiber, casting, titanium, and zirconia posts on stress distribution in maxillary central tooth treated with different amounts of ferrule using finite-element analysis.

Materials And Methods: In this experimental study, three-dimensional models of maxillary central incisors that have undergone root canal treatment were designed. Then, the models were divided into four groups according to the type of post (Ni-Cr casting, glass fiber, titanium, and zirconia) used. Read More

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February 2021

Experimental resin-modified calcium-silicate cement containing N-(2-hydroxyethyl) acrylamide monomer for pulp tissue engineering.

Mater Sci Eng C Mater Biol Appl 2021 Jul 27;126:112105. Epub 2021 Apr 27.

KU Leuven (University of Leuven), Department of Oral Health Sciences, BIOMAT - Biomaterials Research group & UZ Leuven (University Hospitals Leuven), Dentistry, Leuven, Belgium.

Aim: Our study aimed to measure (1) the flexural strength, (2) shear bond strength to dentin, (3) pH, and (4) calcium (Ca) release of a series of innovative resin-modified calcium-silicate pulp-capping cements (Rm-CSCs). Using an ex-vivo human vital tooth-culture model, we additionally assessed (5) their pulp-healing initiation when brought in direct contact with human dental pulp tissue.

Methodology: Three experimental Rm-CSCs, being referred to 'Exp_HEAA', 'Exp_GDM' and 'Exp_HEAA/GDM', contained either 20 wt% N-(2-hydroxyethyl) acrylamide (HEAA), 20 wt% glycerol dimethacrylate (GDM) or 10 wt% HEAA plus 10 wt% GDM, added to a common base composition consisting of 25 wt% urethane dimethacrylate (UDMA), 10 wt% 4-methacryloxyethyl trimellitate anhydride (4-MET), and 5 wt% N,N'-{[(2-acrylamido-2-[(3-acrylamidopropoxy)methyl] propane-1,3-diyl)bis(oxy)]bis-(propane-1,3-diyl)}diacrylamide (FAM-401). Read More

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Removal of arsenic from aqueous solution by novel iron and iron-zirconium modified activated carbon derived from chemical carbonization of Tectona grandis sawdust: Isotherm, kinetic, thermodynamic and breakthrough curve modelling.

Environ Res 2021 May 31;200:111431. Epub 2021 May 31.

Department of Environmental Engineering, Kwangwoon University, Seoul, 139-701, Republic of Korea. Electronic address:

The aim of the present study was: development of activated carbon modified with iron ([email protected]) and modified with iron and zirconium ([email protected]) from the Tectona grandis sawdust (TGS) waste biomass and its potential applicability for the removal of As (III) from contaminated water by batch and column mode. The biomass waste was pre-treated with ferric chloride (FeCl) and the mixture of FeCl and zirconium oxide (ZrO) and then pyrolyzed at 500 °C for 2 h. The properties of both bioadsorbents were comprehensively characterized by using Scanning electron microscopy (SEM), Energy dispersive X-ray (EDX), Fourier transform infra-red spectroscopy (FTIR), X-ray diffraction (XRD), Particle Size analysis (PSA), point of zero charge (pH), Brunauer-Emmett-Teller (BET) to prove successful impregnation of the Fe and Zr on the surface of AC of TGS. Read More

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Bacteriological Evaluation of Gingival Crevicular Fluid in Teeth Restored Using Fixed Dental Prostheses: An In Vivo Study.

Int J Mol Sci 2021 May 22;22(11). Epub 2021 May 22.

Department of Prosthodontics and Implantology, College of Dentistry, King Faisal University, Al-Hofuf, Al-Ahsa 31982, Saudi Arabia.

The present in vivo study determined the microbiological counts of the gingival crevicular fluid (GCF) among patients with fixed dental prostheses fabricated using three different techniques. A total of 129 subjects were divided into three study groups: first, cobalt-chrome-based, metal-ceramic prostheses fabricated by the conventional method (MC, = 35); the second group consisted of cobalt-chrome-based, metal-ceramic prostheses fabricated by the computer-aided design and computer-aided manufacturing (CAD/CAM) technique (CC-MC, = 35); the third group comprised zirconia-based ceramic prostheses fabricated using the CAD/CAM technique (CC-Zr, = 35). The control consisted of 24 patients using prostheses fabricated with either MC, CC-MC, or CC-Zr. Read More

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Shear Bond Strength of Composite Cement to Lithium-Disilicate Glass-coated Zirconia Versus Alumina Air-abraded Zirconia.

J Adhes Dent 2021 Jun;23(3):267-275

Purpose: To compare the shear bond strength of composite cement to lithium-disilicate glass-ceramic coated zirconia vs to alumina air-abraded zirconia and to analyze the residual stresses on both of lithium-disilicate glass-ceramic coated zirconia vs alumina air-abraded zirconia specimens.

Materials And Methods: One hundred eighty zirconia disks (diameters 10 mm and 5 mm, 4.5 mm thick) were divided into two groups: lithium-disilicate glass-ceramic coating followed by hydrofluoric acid etching and Monobond N Primer (LiDi) or alumina air-abrasion (AA). Read More

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The influence of the resin-based cement layer on ceramic-dentin bond strength.

Eur J Oral Sci 2021 May 31:e12791. Epub 2021 May 31.

Institute of Clinical Dentistry, University of Oslo, Oslo, Norway.

The purpose of the study was to measure the cement thickness obtained when ceramic rods were luted to dentin and to analyze the relation between cement thickness and the previously published tensile bond strength of similar test specimens. In addition, the ISO standard 4049:2019 method was used to determine the film thickness of the used cements. Zirconia (n = 100) and lithium disilicate (n = 50) rods were cemented to bovine dentin using one of five different resin-based cements. Read More

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Inflammatory responses to metal oxide ceramic nanopowders.

Sci Rep 2021 May 18;11(1):10531. Epub 2021 May 18.

Faculty of Medical Sciences, Translational and Clinical Research Institute, Newcastle University, Newcastle upon Tyne, NE1 4HH, UK.

Ceramic orthopaedic implants are increasingly popular due to the need for robust total joint replacement implants that have a high success rate long-term and do not induce biological responses in patients. This study was designed to investigate the biological effects of ceramic nanopowders containing aluminium oxide or zirconium oxide to activate the human macrophage THP-1 cell line. In vitro investigation of pro-inflammatory gene expression and chemokine secretion was performed studied using RT-qPCR and ELISA, respectively. Read More

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Comparison of conventional and digital workflows for implant-supported screw-retained zirconia FPD bars: Fit and cement gap evaluation using SEM analysis.

Int J Oral Implantol (Berl) 2021 May;14(2):199-210

Purpose: To assess the fit and cement gap of fixed partial dentures supported by two implants made using conventional and digital workflows.

Materials And Methods: Patients requiring fixed partial dentures supported by two implants were included in the study. Forty-eight zirconia fixed partial denture bars supported by two implants (AnyOne, MegaGen, Daegu, South Korea) were produced using a conventional (n = 24, group C) and digital (n = 24, group D) workflow. Read More

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Full-arch implant-supported monolithic zirconia fixed dental prostheses: An updated systematic review.

Int J Oral Implantol (Berl) 2021 Mar;14(1):13-22

Purpose: To update an existing systematic review assessing the clinical performance of full-arch implant-supported monolithic zirconia fixed dental prostheses.

Materials And Methods: The review was conducted according to the guidelines outlined in the Preferred Reporting Items of Systematic Reviews and Meta-analyses (PRISMA) statement. An electronic search was conducted using the PubMed, Science Direct and Cochrane Library databases to identify clinical studies on full-arch implant-supported monolithic and minimally layered zirconia fixed dental prostheses. Read More

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Zirconium dioxide implants as an alternative to titanium: A systematic review.

J Clin Exp Dent 2021 May 1;13(5):e511-e519. Epub 2021 May 1.

Zirconia Implant Research Group, Silver Spring, MD, 20910, USA.

Background: This systematic review evaluates the available scientific literature to demonstrate the aesthetic and clinical benefits and to determine the survival and the success of zirconium dioxide implants concerning titanium implants.

Material And Methods: The electronic databases were searched until January 2020. Outcome measures were pink aesthetic score (PAS), white aesthetic score (WAS), bleeding on probing (BOP) and probing depth (PD). Read More

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Upshot of Concentration of Zirconium (IV) Oxynitrate Hexa Hydrate on Preparation and Analyses of Zirconium Oxide (ZrO₂) Nanoparticles by Modified Co-Precipitation Method.

J Nanosci Nanotechnol 2021 Nov;21(11):5707-5713

#120, Energy Materials Lab, Department of Physics, Science Block, Alagappa University, Karaikudi 630003 Tamil Nadu, India.

In the present work, pure nanocrystalline monoclinic Zirconia (ZrO₂) has been successfully synthesized and optimized by the modified co-precipitation method. The concentration of raw material has been optimized with the fixed amount of precipitation agent (Potassium hydroxide KOH). The thermal history of the precursor has been examined through TG/DTA analysis. Read More

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November 2021

Optical Behavior of Zirconia-Based Restorations Over Teeth and Implants in the Esthetic Zone: A Clinical Report.

Compend Contin Educ Dent 2021 May;42(5):236-241

Professor, Department of Dentistry, Federal University of Santa Catarina, Florianópolis, Brazil.

While various zirconia-based alternatives are available today for the restoration of teeth and implants in the esthetic zone, each treatment approach could result in different optical behavior. To clinically demonstrate these differences, this case report describes a rehabilitation in the esthetic zone using several options of teeth- and implant-supported restorations. Conventional veneered zirconia crowns, high-translucent monolithic zirconia crowns, and minimally veneered high-translucent zirconia crowns were proposed and assessed under different light sources before cementation. Read More

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Peptidic biofunctionalization of laser patterned dental zirconia: A biochemical-topographical approach.

Mater Sci Eng C Mater Biol Appl 2021 Jun 20;125:112096. Epub 2021 Apr 20.

Biomaterials, Biomechanics and Tissue Engineering Group (BBT), Department of Materials Science and Engineering, Universitat Politècnica de Catalunya-BarcelonaTECH, 08019 Barcelona, Spain; Barcelona Research Center in Multiscale Science and Engineering, Universitat Politècnica de Catalunya-BarcelonaTECH, 08019 Barcelona, Spain. Electronic address:

A dual approach employing peptidic biofunctionalization and laser micro-patterns on dental zirconia was explored, with the aim of providing a flexible tool to improve tissue integration of restorations. Direct laser interference patterning with a femtosecond Ti:Sapphire laser was employed, and two periodic grooved patterns were produced with a periodicity of 3 and 10 μm. A platform containing the cell-adhesive RGD and the osteogenic DWIVA peptides was used to functionalize the grooved surfaces. Read More

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Atomic layer deposited nanolaminates of zirconium oxide and manganese oxide from manganese(III)acetylacetonate and ozone.

Nanotechnology 2021 May 26;32(33). Epub 2021 May 26.

Institute of Physics, University of Tartu, W. Ostwaldi tn 1, 50411 Tartu, Estonia.

Atomic layer deposition method was used to grow thin films consisting of ZrOand MnOlayers. Magnetic and electric properties were studied of films deposited at 300 °C. Some deposition characteristics of the manganese(III)acetylacetonate and ozone process were investigated, such as the dependence of growth rate on the deposition temperature and film crystallinity. Read More

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Efficient solar light facilitated photo-oxidative detoxification of gaseous 2-chloroethyl ethyl sulfide on ZrO-doped g-CN under dry and humid air.

Chemosphere 2021 Apr 27;280:130685. Epub 2021 Apr 27.

Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, Republic of Korea. Electronic address:

Photo-oxidation of chemical warfare agents is considered a promising strategy to cope with threats from accidental or intentional release. In this study, heterostructure photocatalysts comprising different amounts of zirconium oxide (ZrO) over carbon nitride (CN) were synthesized via simple thermal exfoliation, followed by a precipitation method. The successful photocatalytic detoxification activity of the as-prepared photocatalyst was analyzed against 2-chloroethyl ethyl sulfide (CEES) under simulated solar light and natural sunlight irradiation in dry and humid air. Read More

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Effect of laser irradiation on bond strength between zirconia and resin cement or veneer ceramic: A systematic review and meta-analysis.

J Indian Prosthodont Soc 2021 Apr-Jun;21(2):125-137

Department of Surgery and Integrated Clinic, Division of Periodontics, Group for the Research and Study of Laser in Dentistry, Aracatuba Dental School, Sao Paulo State University (UNESP), Sao Paulo, Brazil.

Aim: This systematic review with meta-analysis aimed to evaluate the effect of the laser treatment on bond strength between Y-TZP and the resin cement or with the veneering ceramic, and the effect on the alteration of the Y-TZP surface roughness.

Settings And Design: Systematic review and meta analysis following PROSPERO guidelines.

Materials And Methods: A comprehensive review was performed up to September 2020 on four databases (PubMed/MEDLINE, Embase, Scopus, and Cochrane Library), using the combination of keywords: "laser AND zirconia AND surface treatment AND bond strength". Read More

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The impact of nanoparticles-modified repair resin on denture repairs: a systematic review.

Jpn Dent Sci Rev 2021 Nov 14;57:46-53. Epub 2021 Apr 14.

Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia.

This study aimed to evaluate the effect of nanoparticles on the mechanical properties of acrylic denture repairs. The review was designed following PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analysis) guidelines. Database search was conducted involving articles published from 2000 to 2020 using the following keywords: PMMA/nanoparticles, denture repair/nanoparticles, and repair strength/nanoparticles. Read More

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November 2021

Fracture Load of CAD/CAM Fabricated Cantilever Implant-Supported Zirconia Framework: An In Vitro Study.

Molecules 2021 Apr 13;26(8). Epub 2021 Apr 13.

Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University, Riyadh 11545, Saudi Arabia.

The fracture resistance of computer-aided designing and computer-aided manufacturing CAD/CAM fabricated implant-supported cantilever zirconia frameworks (ISCZFs) is affected by the size/dimension and the micro cracks produced from diamond burs during the milling process. The present in vitro study investigated the fracture load for different cross-sectional dimensions of connector sites of implant-supported cantilever zirconia frameworks (ISCZFs) with different cantilever lengths (load point). A total of 48 ISCZFs (Cercon, Degudent; Dentsply, Deutschland, Germany) were fabricated by CAD/CAM and divided into four groups based on cantilever length and reinforcement of distal-abutment: Group A: 9 mm cantilever; Group B: 9 mm cantilever with reinforced distal-abutment; Group C: 12 mm cantilever; Group D: 12 mm cantilever with reinforced distal-abutment ( = 12). Read More

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Tooth Discoloration Using Calcium Silicate-Based Cements For Simulated Revascularization in Vitro.

Braz Dent J 2021 Jan-Feb;32(1):53-58

Postgraduate Program in Dentistry, School of Dentistry, University of Taubaté, Taubaté, Brazil.

The endodontic revascularization may be an alternative treatment for necrotic immature teeth, however, several treatment steps may cause tooth discoloration. This study evaluated the use of three calcium silicate-based cements with different radiopacifying agents on the color alteration (∆E) of extracted premolars after simulation of revascularization. Forty single rooted extracted premolars were shaped with #1-6 gates Glidden drills, rinsed with sodium hypochlorite, and filled with fresh human blood. Read More

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Direct assessment of the acidity of individual surface hydroxyls.

Nature 2021 Apr 28;592(7856):722-725. Epub 2021 Apr 28.

Institute of Applied Physics, TU Wien, Vienna, Austria.

The state of deprotonation/protonation of surfaces has far-ranging implications in chemistry, from acid-base catalysis and the electrocatalytic and photocatalytic splitting of water, to the behaviour of minerals and biochemistry. An entity's acidity is described by its proton affinity and its acid dissociation constant pK (the negative logarithm of the equilibrium constant of the proton transfer reaction in solution). The acidity of individual sites is difficult to assess for solids, compared with molecules. Read More

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Fracture Resistance of Zirconia, Polyetheretherketone, and Polyetherketoneketone Implant Abutments After Aging.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):332-340

Purpose: This study aimed to assess the fracture resistance of zirconia (Zr), reinforced polyetheretherketone (PEEK), and polyetherketoneketone (PEKK) implant abutments restored with glass-ceramic crowns after thermomechanical aging.

Materials And Methods: Zr, reinforced PEEK, and PEKK titanium base abutments were divided into three groups (n = 10). CAD/CAM maxillary central incisor crowns were fabricated using monolithic lithium disilicate and luted to the abutments using resin cement. Read More

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Mechanical Stability of Restorations Supported by Titanium Base, Zirconia, and Polyetherketoneketone Abutments on One- and Two-Piece Zirconia Implants.

Int J Oral Maxillofac Implants 2021 Mar-Apr;36(2):313-321

Purpose: To evaluate survival, complication rates, and bending moments of one- and two-piece zirconia implants restored with different abutment materials and lithium disilicate crowns after aging, compared to titanium implants restored with titanium base-supported lithium disilicate crowns.

Materials And Methods: Sixty anterior crowns were either screwretained on two-piece titanium implants (C) and two-piece zirconia implants (T1, T2, T3) or cemented on one-piece zirconia implants (T4), resulting in 5 groups with 12 specimens each. For the screw-retained crowns, different abutment materials and implant connections were tested: titanium base with internal conical connection and horizontal joint component (C and T2), zirconia with internal hexagonal connection and horizontal joint component (T1), and polyetherketoneketone with internal hexagonal connection and horizontal joint component (T3). Read More

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Superior and stable ferroelectric properties of hafnium-zirconium-oxide thin films deposited atomic layer deposition using cyclopentadienyl-based precursors without annealing.

Nanoscale 2021 May;13(18):8524-8530

Department of Materials Science and Chemical Engineering, Hanyang University, Ansan 15588, Republic of Korea.

HfO2-based ferroelectric thin films deposited via atomic layer deposition have been extensively studied as promising candidates for next-generation ferroelectric devices. The conversion of an amorphous Hf1-xZrxO2 film to the ferroelectric phase (non-centrosymmetric orthorhombic phase) has been achieved through annealing using a post-thermal process. However, in this study, we present the first report of ferroelectricity of hafnium-zirconium-oxide (HZO) thin films deposited via atomic layer deposition using cyclopentadienyl-based precursors without additional post-thermal processing. Read More

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Sub-Nanometer Nanobelts Based on Titanium Dioxide/Zirconium Dioxide-Polyoxometalate Heterostructures.

Adv Mater 2021 Jun 27;33(23):e2100576. Epub 2021 Apr 27.

Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China.

In addition to offering conformational flexibility, sub-nanometer nanobelts (SNBs) also outperform many larger nanobelts with large size owing to their ultrathin morphologies. However, to date, only a few monocomponent SNBs have been synthesized. This study presents a facile method for synthesizing ZrO -PMoO (PMZ) SNBs and TiO -PMoO (PMT) SNBs with heterostructures. Read More

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Influence of Surface Modification Protocol and Type of Luting Cement on Bonding of Monolithic Zirconia to Dentin Substrate.

J Contemp Dent Pract 2020 Dec 1;21(12):1342-1349. Epub 2020 Dec 1.

Department of Restorative Dentistry, Taibah University, Madinah, Kingdom of Saudi Arabia, Phone: +966554654666, e-mail:

Aim And Objective: To assess microtensile bond strength (μTBS) of two types of luting cement to monolithic zirconia and dentin following various surface modifications and aging.

Materials And Methods: Monolithic zirconia blocks were divided into four main groups. Group N: no surface modification; Group SB: sandblasted using 50 μm AlO particles. Read More

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December 2020

Flexural test as an alternative to tensile test for bond strength of resin cement to zirconia.

J Mech Behav Biomed Mater 2021 07 20;119:104525. Epub 2021 Apr 20.

Department of Conservative Dentistry, Seoul National University School of Dentistry, Seoul, South Korea; Dental Research Institute, Seoul National University, Seoul, South Korea; Technology-leading Open Platform for Dental Instrumentation, Seoul National University Dental Hospital, Seoul, South Korea. Electronic address:

Objective: There has been a great many technical difficulties in measuring the bond strengths between brittle dental substrates and materials, especially in preparing specimens. This study evaluated the validity of the relatively easy flexural bond strength (FBS) test in measuring bond strength of resin cement to zirconia as an alternative to the cumbersome tensile bond strength (TBS) and micro-tensile bond strength (MTBS) tests.

Materials And Methods: The FBS and TBS of resin cement to zirconia were measured experimentally after three surface treatments on a zirconia ceramic: air abrasion only (A), conditioning with Single Bond Universal (U) after air abrasion, and conditioning with Z-Prime Plus (Z) after air abrasion. Read More

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Translucency of nanoparticle-reinforced PMMA denture base material: An invitro comparative study.

Dent Mater J 2021 Apr 22. Epub 2021 Apr 22.

Department of Substitutive Dental Sciences, College of Dentistry, Imam Abdulrahman Bin Faisal University.

The aim of this study was to assess the translucency of denture base acrylic resin reinforced with zirconium dioxide (ZrONPs), silicon dioxide (SiONPs), and diamond (DNPs) nanoparticles. A total of 130 heat-polymerized acrylic discs (15×2.5 mm) were fabricated conventionally and divided into control and experimental groups according to nanoparticle type and concentration (0. Read More

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