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https://www.readbyqxmd.com/read/28054794/full-mouth-implant-rehabilitation-with-monolithic-zirconia-benefits-and-limitations
#1
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/28050314/biocompatibility-study-of-lithium-disilicate-and-zirconium-oxide-ceramics-for-esthetic-dental-abutments
#2
Céline Brunot-Gohin, Jean-Luc Duval, Sandra Verbeke, Kayla Belanger, Isabelle Pezron, Gérard Kugel, Dominique Laurent-Maquin, Sophie Gangloff, Christophe Egles
PURPOSE: The increasing demand for esthetically pleasing results has contributed to the use of ceramics for dental implant abutments. The aim of this study was to compare the biological response of epithelial tissue cultivated on lithium disilicate (LS2) and zirconium oxide (ZrO2) ceramics. Understanding the relevant physicochemical and mechanical properties of these ceramics will help identify the optimal material for facilitating gingival wound closure. METHODS: Both biomaterials were prepared with 2 different surface treatments: raw and polished...
December 2016: Journal of Periodontal & Implant Science
https://www.readbyqxmd.com/read/28048424/su-f-t-426-measurement-of-dose-enhancement-due-to-backscatter-from-modern-dental-materials
#3
M Hurwitz, T Tso, S Lee, E Rosen, D Margalit, C Williams
PURPOSE: High-density materials used in dental restoration can cause significant localized dose enhancement due to electron backscatter in head-and-neck radiotherapy, increasing the risk of mucositis. The materials used in prosthetic dentistry have evolved in the last decades from metal alloys to ceramics. We aim to determine the dose enhancement caused by backscatter from currently-used dental materials. METHODS: Measurements were performed for three different dental materials: lithium disilicate (Li2 Si2 O5 ), zirconium dioxide (ZrO2 ), and gold alloy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042280/advancements-in-all-ceramics-for-dental-restorations-and-their-effect-on-the-wear-of-opposing-dentition
#4
REVIEW
Haroon Rashid, Zeeshan Sheikh, Syed Misbahuddin, Murtaza Raza Kazmi, Sameer Qureshi, Muhammad Zuhaib Uddin
Tooth wear is a process that is usually a result of tooth to tooth and/or tooth and restoration contact. The process of wear essentially becomes accelerated by the introduction of restorations inside the oral cavity, especially in case of opposing ceramic restorations. The newest materials have vastly contributed toward the interest in esthetic dental restorations and have been extensively studied in laboratories. However, despite the recent technological advancements, there has not been a valid in vivo method of evaluation involving clinical wear caused due to ceramics upon restored teeth and natural dentition...
October 2016: European Journal of Dentistry
https://www.readbyqxmd.com/read/28024819/randomized-controlled-within-subject-evaluation-of-digital-and-conventional-workflows-for-the-fabrication-of-lithium-disilicate-single-crowns-part-ii-cad-cam-versus-conventional-laboratory%C3%A2-procedures
#5
Irena Sailer, Goran I Benic, Vincent Fehmer, Christoph H F Hämmerle, Sven Mühlemann
STATEMENT OF PROBLEM: Clinical studies are needed to evaluate the entire digital and conventional workflows in prosthetic dentistry. PURPOSE: The purpose of the second part of this clinical study was to compare the laboratory production time for tooth-supported single crowns made with 4 different digital workflows and 1 conventional workflow and to compare these crowns clinically. MATERIAL AND METHODS: For each of 10 participants, a monolithic crown was fabricated in lithium disilicate-reinforced glass ceramic (IPS e...
December 23, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28018566/interfacial-modulus-mapping-of-layered-dental-ceramics-using-nanoindentation
#6
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/28007396/academy-of-dental-materials-guidance-on-in-vitro-testing-of-dental-composite-bonding-effectiveness-to-dentin-enamel-using-micro-tensile-bond-strength-%C3%AE-tbs-approach
#7
Steve Armstrong, Lorenzo Breschi, Mutlu Özcan, Frank Pfefferkorn, Marco Ferrari, Bart Van Meerbeek
OBJECTIVE: An ideal dental adhesive should provide retentive strength, marginal seal, be relatively simple to achieve and demonstrate clinical durability. Future improvements in adhesive bonding to tooth structure require in vitro test methods that provide reliable data for materials development and/or evaluation of experimental variables. The objective of this project was to identify a test method that is relatively easy to perform, repeatable and ultimately useful for predicting clinical outcomes...
December 19, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
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
#8
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/28002827/the-in-vivo-inhibition-of-oral-biofilm-accumulation-and-streptococcus-mutans-by-ceramic-water
#9
Ryota Nomura, Risa Yoneyama, Shuhei Naka, Masatoshi Otsugu, Yuko Ogaya, Rina Hatakeyama, Yumiko Morita, Jumpei Maruo, Michiyo Matsumoto-Nakano, Osamu Yamada, Kazuhiko Nakano
Combustion-synthesized titanium carbide ceramics uniformly disperse silver, producing silver ions and hydroxyl radicals in water. This generates antimicrobial activity against various bacteria. One such bacterium is Streptococcus mutans, a gram-positive anaerobic bacterium known as a major pathogen of dental caries. In this study, we analyzed the inhibition of oral biofilms and S. mutans by ceramic water in in vitro and human studies. S. mutans strains showed significantly lower antimicrobial and sucrose-dependent adhesion activity in the presence of ceramic powder compared with untreated culture medium...
December 22, 2016: Caries Research
https://www.readbyqxmd.com/read/28000280/modern-implant-dentistry-based-on-osseointegration-50%C3%A2-years-of-progress-current-trends-and-open-questions
#10
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
https://www.readbyqxmd.com/read/28000266/zirconia-dental-implants-where-are-we-now-and-where-are-we-heading
#11
REVIEW
Norbert Cionca, Dena Hashim, Andrea Mombelli
Despite decades of titanium as the gold standard in oral implantology, the search for alternatives has been growing. High esthetic standards and increasing incidence of titanium allergies, along with a rising demand for metal-free reconstructions, have led to the proposal of ceramics as potential surrogates. Following numerous experimental studies, zirconium dioxide (zirconia) has earned its place as a potential substitute for titanium in implantology. Yet, despite zirconia's excellent biocompatibility and tissue integration, low affinity to plaque and favorable biomechanical properties, early failures were significantly higher for zirconia implants than for titanium implants...
February 2017: Periodontology 2000
https://www.readbyqxmd.com/read/27995653/influence-of-misfit-on-the-occurrence-of-veneering-porcelain-fractures-chipping-in-implant-supported-metal-ceramic-fixed-dental-prostheses-an-in%C3%A2-vitro-pilot-trial
#12
Nils Löfgren, Christel Larsson, Nikos Mattheos, Martin Janda
OBJECTIVE: Technical complications such as veneer fractures are more common in implant-supported than tooth-supported restorations. The underlying causes have not been fully identified. The aim of this study was to evaluate whether misfit between the restoration and the implant may affect the risk of veneer fractures. MATERIALS AND METHODS: Twenty standardized five-unit implant-supported metal-ceramic fixed dental prostheses (FDP)s were manufactured and fixed in acrylic blocks...
December 19, 2016: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/27995137/biomechanical-consequences-of-the-elastic-properties-of-dental-implant-alloys-on-the-supporting-bone-finite-element-analysis
#13
Esteban Pérez-Pevida, Aritza Brizuela-Velasco, David Chávarri-Prado, Antonio Jiménez-Garrudo, Fernando Sánchez-Lasheras, Eneko Solaberrieta-Méndez, Markel Diéguez-Pereira, Felipe J Fernández-González, Borja Dehesa-Ibarra, Francesca Monticelli
The objective of the present study is to evaluate how the elastic properties of the fabrication material of dental implants influence peri-implant bone load transfer in terms of the magnitude and distribution of stress and deformation. A three-dimensional (3D) finite element analysis was performed; the model used was a section of mandibular bone with a single implant containing a cemented ceramic-metal crown on a titanium abutment. The following three alloys were compared: rigid (Y-TZP), conventional (Ti-6Al-4V), and hyperelastic (Ti-Nb-Zr)...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27987709/synthesis-characterization-and-bioactivity-of-a-calcium-phosphate-glass-ceramics-obtained-by-the-sol-gel-processing-method
#14
Nouha Jmal, Jamel Bouaziz
In this work, a calcium-phosphate glass-ceramics was successfully obtained by heat treatment of a mixture of 26.52 in wt.% of fluorapatite (Fap) and 73.48 in wt.% of 77S (77 SiO214 CaO9 P2O5 in wt.%) gel. The calcium phosphate-glass-ceramics was prepared by sol-gel process with tetraethyl orthosilicate (TEOS), triethyl phosphate (TEP), calcium nitrate and fluorapatite. The synthesized powders were characterized by some commonly used tools such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), (31)P magic angle spinning nuclear magnetic resonance (MAS-NMR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and thin-film X-ray diffraction (TF-XRD)...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27987657/influence-of-interlayer-design-on-residual-thermal-stresses-in-trilayered-and-graded-all-ceramic-restorations
#15
Bruno Henriques, Douglas Fabris, Júlio C M Souza, Filipe S Silva, Joana Mesquita-Guimarães, Yu Zhang, Márcio Fredel
Residual thermal stresses are formed in dental restorations during cooling from high temperature processing. The aim of this study was to evaluate the influence of constructive design variables (composition and interlayer thickness) on residual stresses in alumina- and zirconia-graded restorations. Restorations' real-like cooling conditions were simulated using finite elements method and temperature-dependent material properties were used. Three different designs were evaluated: a bilayered restoration (sharp transition between materials); a trilayered restoration with a homogenous interlayer between core and veneer; and a trilayered restoration with a graded interlayer...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27984088/ten-year-survival-and-complication-rates-of-lithium-disilicate-empress-2-tooth-supported-crowns-implant-supported-crowns-and-fixed-dental-prostheses
#16
Maren Teichmann, Fabian Göckler, Volker Weber, Murat Yildirim, Stefan Wolfart, Daniel Edelhoff
OBJECTIVES: To prospectively evaluate the clinical long-term outcome of tooth-supported crowns (SCs), implant-supported crowns (ISCs), and fixed dental prostheses (FDPs) made of a lithium-disilicate glass-ceramic framework material (IPS Empress 2). MATERIALS AND METHODS: Between 1997 and 1999, a total of 184 restorations (106 SCs, 32 ISCs, 33 FDPs, and 13 diverse restorations) were placed in 73 patients. Kaplan-Meier estimation was applied for survival and chipping-free rates...
January 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/27977814/clinical-evaluation-of-the-influence-of-connection-type-and-restoration-height-on-the-reliability-of-zirconia-abutments-a-retrospective-study-on-965-abutments-with-a-mean-6-year-follow-up
#17
Giacomo Fabbri, Mauro Fradeani, Gianluca Dellificorelli, Marco De Lorenzi, Fernando Zarone, Roberto Sorrentino
This multicenter retrospective clinical study aimed to evaluate the clinical performance of zirconia abutments in anterior and posterior regions, focusing on implant-abutment connections and restoration vertical height (RVH). Six experienced prosthodontists used 965 computer-aided design/computer-assisted manufacture zirconia abutments in 601 patients. Different surgical approaches were taken according to the needs of each patient. The final restorations were all-ceramic single crowns and short-span fixed dental prostheses...
January 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/27965493/new-single-bottle-ceramic-primer-6-month-case-report-and-laboratory-performance
#18
Fabiana Sf Siqueira, Rodrigo S Alessi, Andres Fm Cardenas, Carlos Kose, Shelon C Souza Pinto, Matheus C Bandeca, Alessandro D Loguercio, João C Gomes
INTRODUCTION: This article presents a 6-month case report and an in vitro evaluation of the performance of the new self-etching glass-ceramic monobond etch and prime (MEP) when applied in a lithium disilicate (LD). The MEP contains in the same bottle, along with acid conditioner and silanes. This simplifies the bonding procedures by reducing not only the number of steps, but also the working time. A 42-year-old female patient sought for esthetic treatment, and the main complaint was the darkened appearance of the upper lateral incisor...
December 1, 2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27965487/accuracy-of-three-shade-matching-devices-in-replicating-the-shade-of-metal-ceramic-restorations-an-in-vitro-study
#19
Shruti Lakhanpal, Menon S Neelima
INTRODUCTION: In restorative dentistry, the clinician commonly encounters the challenge of replicating the color of natural teeth due to the subjectivity of perceptual evaluation. Recent advances in photography and computing have resulted in the widespread use of the digital camera for color imaging. These instruments can be used effectively for shade matching and communication to yield predictable results. MATERIALS AND METHODS: The study sample consisted of 20 freshly extracted noncarious premolars...
December 1, 2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27964931/the-effect-of-extended-aging-on-the-optical-properties-of-different-zirconia-materials
#20
Tariq F Alghazzawi
PURPOSE: The purpose of this study was to determine if the optical properties of zirconia and glass-ceramic (e.max) were affected by low-temperature degradation (aging). METHODS: Experiment samples were fabricated with seven zirconia brands (n=10): Zenostar, Zirlux, Katana, Bruxzir, DD-BioZX(2), DD-cubeX(2), NexxZr; and e.max were used as a control. This resulted in a total of 80 samples in the experiment. The L*, a* and b* were measured for each sample, and then the optical properties including translucency parameter (TP), contrast ratio (CR), and opalescence parameter (OP) were calculated...
December 7, 2016: Journal of Prosthodontic Research
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