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Dental And Zirconia

Eeraveni Ranadheer, Utsav D Shah, Kiran Kumar Neelakantappa, Shoba Fernandes
Context Various restorative materials are introduced in dentistry to achieve adequate strength and restore aesthetics. Dental amalgam is a versatile material with self-sealing property, but is unaesthetic. Other restorative materials like composites require conservative preparation, but exhibit polymerisation shrinkage resulting in microleakage. To overcome these drawbacks, a high strength restorative material reinforced with ceramic and zirconia fillers known as Zirconomer (Shofu Inc., Japan) has been introduced...
December 3, 2018: Curēus
M V Swain, V Mercurio, J E Tibballs, M Tholey
OBJECTIVE: To determine the thermal expansion of a porcelain (VM9) and tetragonal zirconia (Y-TZP) as well as the deflection upon re-heating and cooling of a bilayer fabricated from these two materials after slow and rapid cooling during initial fabrication. METHODS: The coefficient of thermal expansion (CTE) of bulk porcelain and Y-TZP as well as bilayer beam deflection was measured with a novel non-contact optical dilatometer. The influence of cooling rate during initial fabrication of the porcelain-zirconia bilayer and the bulk porcelain during subsequent heating and cooling is investigated...
February 6, 2019: Dental Materials: Official Publication of the Academy of Dental Materials
Ikiru Atsuta, Yasunori Ayukawa, Akihiro Furuhashi, Ikue Narimatsu, Ryosuke Kondo, Wakana Oshiro, Kiyoshi Koyano
The aims of implant treatment now involve not only restoration of mastication function, but also recovery of esthetics. Currently, zirconia is widely used as an esthetic material for implant abutment. Therefore, it is very important to understand the efficacy of zirconia for epithelial sealing as an implant material. We compared the effects of materials on the sealing of the peri-implant epithelium (PIE) to titanium (Ti) or zirconia (Zr) implants, for application to clinical work. Maxillary first molars were extracted from rats and replaced with Ti or Zr implants...
February 6, 2019: Journal of Biomedical Materials Research. Part A
Silvia Brandt, Anna Winter, Hans-Christoph Lauer, Fritz Kollmar, Soo-Jeong Portscher-Kim, Georgios E Romanos
The IPS e.max system by Ivoclar Vivadent, offering a variety of products and indications, is widely used for all-ceramic restorations. We analyzed the clinical track record of these products in daily clinical practice, associating their restorative survival rate with various parameters to define recommendations for long-term stability. A total of 1058 full-coverage crowns and fixed partial dentures (FPDs) were evaluated retrospectively over up to 66.48 (37.05 ± 18.4) months. All were made of IPS e.max Press, IPS e...
February 2, 2019: Materials
Jonas Lorenz, Nino Giulini, Werner Hölscher, Andreas Schwiertz, Frank Schwarz, Robert Sader
BACKGROUND: Dental implants made of zirconia ceramics experienced a renaissance in the past years. However, there is still a lack in reliable long-term clinical data. PURPOSE: Aim of the present prospective clinical study was to analyze the dental implants made from zirconia, regarding their clinical performance compared to natural teeth (control). MATERIALS AND METHODS: Eighty-three zirconia implants in 28 adults were analyzed after 7.8 years of integration...
February 4, 2019: Clinical Implant Dentistry and related Research
Majed Al-Akhali, Matthias Kern, Adham Elsayed, Abdulaziz Samran, Mohamed Sad Chaar
STATEMENT OF PROBLEM: With the development of new computer-aided design and computer-aided manufacturing (CAD-CAM) restorative dental materials, limited data regarding their survival rate and fracture strength are available when they are used as occlusal veneers. Therefore, these materials should be evaluated under conditions similar to those of the oral environment before being recommended for clinical use. PURPOSE: To evaluate the influence of thermomechanical fatigue loading on the fracture strength of minimally invasive occlusal veneer restorations fabricated from different CAD-CAM materials and bonded to human maxillary premolars using self-etchnig bonding technique...
January 30, 2019: Journal of Prosthetic Dentistry
Oscar Borrero-Lopez, Fernando Guiberteau, Yu Zhang, Brian R Lawn
An investigation is made of wear mechanisms in a suite of dental materials with a ceramic component and tooth enamel using a laboratory test that simulates clinically observable wear facets. A ball-on-3-specimen wear tester in a tetrahedral configuration with a rotating hard antagonist zirconia sphere is used to produce circular wear scars on polished surfaces of dental materials in artificial saliva. Images of the wear scars enable interpretation of wear mechanisms, and measurements of scar dimensions quantify wear rates...
January 12, 2019: Journal of the Mechanical Behavior of Biomedical Materials
Oya Akyol, Bahar Dirican, Turkay Toklu, Hakan Eren, Turan Olgar
OBJECTIVES: The aim of this study was to investigate the effect of dental implant materials with different physical densities on dose distribution for head and neck cancer radiotherapy planning. METHODS: Titanium (Ti), Titanium alloy (Ti-6Al-4V), Zirconia (Y-TZP), Zirconium oxide (ZrO2 ), Alumina (Al2 O3 ) and polyetheretherketone (PEEK) dental implant materials were used for determination of implant material effect on dose distribution. Dental implant effect was investigated by using pencil beam convolution (PBC) algorithm of Eclipse treatment planning systems (TPS) and Monte Carlo (MC) simulation technique...
February 1, 2019: Dento Maxillo Facial Radiology
Allison Buchanan, Amelia Orta, Sajitha Kalathingal
OBJECTIVES: The aim of this study was to describe a quality assurance issue, that is, the production of nondiagnostic high-contrast radiographs when imaging teeth restored with all-zirconia crowns on bitewing radiographs. STUDY DESIGN: All-zirconia crowns were imaged with DIGORA Optime photostimulable phosphor (PSP) plates (Soredex/Orion Corp., Helsinki, Finland). To assess the differences in software processing, the PSP plates were scanned into third-party software as well as directly into the twain and native software provided by the manufacturer...
December 31, 2018: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Diogo N M Gouveia, Michael E Razzoog, Maria F Alfaro
The use of a fully digital approach to fabricate an anatomic contour crown to fit an existing removable prosthesis allows the dentist and the dental laboratory technician to work efficiently in a digital environment. This report presents a series of patient treatments involving the fabrication of an anatomic contour monolithic zirconia crown to retrofit an existing removable partial denture. A complete digital workflow comprises an intraoral digital scan and computer-aided design and computer-aided manufacturing (CAD-CAM) technology...
January 17, 2019: Journal of Prosthetic Dentistry
Gabriella A C Springall, Ling Yin
This paper reports on a cyclic nanoindentation approach of a pre-crystallized zirconia-reinforced lithium silicate glass ceramic (ZLS) to understand its material behavior associated with its machinability in dental CAD/CAM diamond abrasive milling. The material response to the cyclic nanoindentation using a Berkovich diamond tip was quantitatively determined in terms of the indentation contact hardness, elastic modulus, elasticity and plasticity for each loading cycle at peak loads of 2.5-10 mN. The cyclic load-displacement curves at different load levels indicate discrete discontinuities and hysteresis loops, which might have arisen from viscoelasticity behavior...
January 10, 2019: Journal of the Mechanical Behavior of Biomedical Materials
Mohammed N Alasqah
BACKGROUND: To systematically review the literature regarding the antimicrobial effects of photodynamic therapy (PDT) on the multi-bacterial species and the possible surface alterations of the dental implants as a result of PDT METHODS: The addressed focused question was: "Does PDT show antimicrobial efficacy against multi-bacterial species colonization and result in surface alteration on dental implants?" Electronic databases including MEDLINE and EMBASE up to and including December 2018 were searched...
January 12, 2019: Photodiagnosis and Photodynamic Therapy
Burcu Kanat-Ertürk
PURPOSE: To investigate the color stability of zirconia-reinforced lithium silicate glass-ceramic and lithium disilicate reinforced glass-ceramic, which were prepared with various surface finishing procedures, following 1-week, 2-weeks, 1-month, and 2-months storage in various beverages, and after the application of polishing paste. MATERIALS AND METHODS: Lithium disilicate glass-ceramic (IPS e.max CAD HT) and zirconia-reinforced lithium silicate ceramic (Vita Suprinity HT) CAD/CAM blocks were sectioned with a diamond saw (Metkon) under water cooling into 1...
January 14, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
René Steiner, Irene Heiss-Kisielewsky, Vincent Schwarz, Dagmar Schnabl, Herbert Dumfahrt, Johannes Laimer, Otto Steinmassl, Patricia-Anca Steinmassl
PURPOSE: Various resin cements and priming agents are available for adhesive luting of zirconia restorations. The purpose of this study was to investigate how cement type and priming protocol affect the shear bond strength on zirconia ceramics. MATERIALS AND METHODS: Yttria-stabilized tetragonal zirconia polycrystalline ceramic cylinders were bonded to flat zirconia ceramic surfaces using 7 commercially available resin cements. Ten specimens of each cement group were pre-treated with a universal primer, and 10 specimens per group were bonded without pre-treatment...
January 9, 2019: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Jingjing Liao, Dou Zhang, Xuewen Wu, Hang Luo, Kechao Zhou, Bo Su
In this paper, a water soluble hydantion epoxy resin (ER) was employed to prepare zirconia green bodies with high mechanical strength via epoxy gel-casting (EGC) for dental applications. The rheological properties and gelation behaviors of the suspensions, and the microstructure and mechanical strength of zirconia were systematically studied. The results revealed that solid loadings of up to 52.0 vol% could be achieved with the addition of 0.8 wt% dispersant. When the concentration of ER in the 52.0 vol% suspensions increased from 10...
March 2019: Materials Science & Engineering. C, Materials for Biological Applications
Rafael Rocha Pacheco, Adriana Oliveira Carvalho, Carolina Bosso André, Ana Paula Almeida Ayres, Renata Bacelar Catanhede de Sá, Tiago Monteiro Dias, Frederick Allen Rueggeberg, Marcelo Giannini
PURPOSE: The aim of this study was to evaluate the influence of indirect restorative material type and thickness on the transmission of different wavelengths from a broad-banded dental curing light. METHODS: Four dental indirect restorative materials for computer-aided design and computer-aided manufacturing (CAD/CAM) were evaluated: [RC] resin/ceramic hybrid material (Lava Ultimate), [FC] feldspathic ceramic (VitaBlocs), and two zirconia-based ceramics ([ZK] Katana; and [ZL] Lava)...
December 28, 2018: Journal of Prosthodontic Research
N Gopi Chander, Arnob Biswas
Objective: The study compared the proximal contact strength (CS) of different fixed dental prosthesis (FDP) materials. Materials and Methods: Thirty volunteers participated in this study with definitive inclusion and exclusion criteria. Participants were divided into full metal, zirconia, and metal ceramic groups. The CS between the natural teeth and the maxillary posterior quadrant FDP was measured with force gauge. The data were evaluated with one-way analysis of variance test, and Tukey's honest significant difference post hoc was done to compare the mean values...
November 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Aws S ArRejaie, Rana S Al-Hamdan, Ghadeer I Basunbul, Tariq Abduljabbar, Khulud A Al-Aali, Nawaf Labban
The aim of the present review was to evaluate the clinical and radiographic performance of one-piece zirconia implants (O-PZI). This review followed the PRISMA (Preferred Reporting Items for Systematic Review and Meta-Analysis) guidelines that addressed the following focused question: What is the overall clinical and radiographic performance of O-PZI? The MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, and Cochrane Oral Health Group Trials Register databases were searched. Six clinical studies were included...
December 26, 2018: Journal of Investigative and Clinical Dentistry
A C Branco, V Moreira, J A Reis, R Colaço, C G Figueiredo-Pina, A P Serro
Loosening and fracture of implanted dental crowns is a consequence of relative micromovements between the zirconia abutment and the titanium alloy of the implant, in a biochemical aggressive environment. Thus, it is important to establish the in vitro tribological testing conditions that better mimics such environment. The present work aims to evaluate the effect of ball-on-plate tests configuration on the tribological behavior of ZrO2 /Ti6Al4V pair in dry and lubricated conditions, using different lubricants: water, artificial saliva solution and human saliva...
December 13, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Hee-Kyung Kim, Sung-Hun Kim
STATEMENT OF PROBLEM: The long-term color stability of precolored monolithic zirconia has not been thoroughly investigated. PURPOSE: The purpose of this in vitro study was to evaluate the effect of hydrothermal aging on the optical properties, phase transformation, and surface topography of precolored monolithic zirconia ceramics. MATERIAL AND METHODS: Precolored monolithic zirconia specimens (17.0×17.0×1.5 mm, n=50) and lithium disilicate glass-ceramic specimens (16...
December 20, 2018: Journal of Prosthetic Dentistry
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