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https://www.readbyqxmd.com/read/28068266/translucency-and-strength-of-high-translucency-monolithic-zirconium-oxide-materials
#1
Todd D Church, Jeffrey P Jessup, Villa L Guillory, Kraig S Vandewalle
The purpose of this study was to evaluate the translucency and strength of highly translucent monolithic zirconia ceramic materials recently introduced to the market. Four monolithic zirconium oxide materials promoted as having high translucency (BruxZir Shaded 16, BruxZir HT, Lava Plus, and inCoris TZI C) were compared to a high-translucency, lithium disilicate monolithic glass-ceramic material (IPS e.max CAD HT). To evaluate translucency, the materials were sectioned into 0.5-, 1.0-, 1.5-, and 2.0-mm-thick specimens; all were sintered and polished...
January 2017: General Dentistry
https://www.readbyqxmd.com/read/28056710/three-dimensional-printing-of-porous-load-bearing-bioceramic-scaffolds
#2
Elena Mancuso, Naif Alharbi, Oana A Bretcanu, Martyn Marshall, Mark A Birch, Andrew W McCaskie, Kenneth W Dalgarno
This article reports on the use of the binder jetting three-dimensional printing process combined with sintering to process bioceramic materials to form micro- and macroporous three-dimensional structures. Three different glass-ceramic formulations, apatite-wollastonite and two silicate-based glasses, have been processed using this route to create porous structures which have Young's modulus equivalent to cortical bone and average bending strengths in the range 24-36 MPa. It is demonstrated that a range of macroporous geometries can be created with accuracies of ±0...
December 1, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28040609/in-situ-observation-of-lubricant-film-formation-in-thr-considering-real-conformity-the-effect-of-diameter-clearance-and-material
#3
D Nečas, M Vrbka, F Urban, J Gallo, I Křupka, M Hartl
The aim of the present study is to provide an analysis of protein film formation in hip joint replacements considering real conformity based on in situ observation of the contact zone. The main attention is focused on the effect of implant nominal diameter, diametric clearance and material. For this purpose, a pendulum hip joint simulator equipped with electromagnetic motors enabling to apply continuous swinging flexion-extension motion was employed. The experimental configuration consists of femoral component (CoCrMo, BIOLOX®forte, BIOLOX®delta) and acetabular cup from optical glass fabricated according to the dimensions of real cups...
December 23, 2016: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28024899/characterization-quantification-and-management-of-china-s-municipal-solid-waste-in-spatiotemporal-distributions-a-review
#4
REVIEW
Binxian Gu, Suqin Jiang, Haikun Wang, Zibo Wang, Renfu Jia, Jie Yang, Sheng He, Rong Cheng
Municipal Solid Waste (MSW) is a heterogeneous waste stream, which is harmful for human health and the ecological environment if it is not well managed. Based on results from different authors by analyzing the generation, physical components and management of MSW from different cities, this paper presents an overview of the temporal trends and spatial variation characterization of MSW generation and its physical components in China. Total MSW generation has increased from 31,320 thousand tons in 1980 to 178,602 thousand tons in 2014, and MSW generation per capita has also increased from 448...
December 23, 2016: Waste Management
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/28018562/effect-of-cement-type-on-the-color-attributes-of-a-zirconia-ceramic
#7
Farhad Tabatabaian, Maliheh Habib Khodaei, Mahshid Namdari, Minoo Mahshid
PURPOSE: This in vitro study evaluated the effects of four different cements on the color attributes of a zirconia ceramic. MATERIALS AND METHODS: 40 zirconia ceramic disk specimens (0.5 mm thickness, 10 mm diameter, 0.1 mm cement space) were fabricated by a computer-aided design and computer-aided manufacturing system. The specimens were divided into 4 groups of 10 specimens and cemented to composite substrates using four different cements including: Glass Ionomer, Panavia F2...
December 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28018558/the-effects-of-different-polishing-techniques-on-the-staining-resistance-of-cad-cam-resin-ceramics
#8
Omer Sagsoz, Tevfik Demirci, Gamze Demirci, Nurdan Polat Sagsoz, Mehmet Yildiz
PURPOSE: The purposes of this study were to evaluate the staining resistance of CAD/CAM resin-ceramics polished with different techniques and to determine the effectiveness of the polishing techniques on resin-ceramics, comparing it with that of a glazed glass-ceramic. MATERIALS AND METHODS: Four different CAD/CAM ceramics (feldspathic ceramic: C-CEREC Blocs, (SIRONA) and three resin-ceramics: L-Lava Ultimate, (3M ESPE), E-Enamic, (VITA) and CS-CeraSmart, (GC)) and one light cure composite resin: ME-Clearfil Majesty Esthetic (Kuraray) were used...
December 2016: Journal of Advanced Prosthodontics
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
#9
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/27987709/synthesis-characterization-and-bioactivity-of-a-calcium-phosphate-glass-ceramics-obtained-by-the-sol-gel-processing-method
#10
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/27987674/biodegradable-ceramic-polymer-composites-for-biomedical-applications-a-review
#11
REVIEW
Michal Dziadek, Ewa Stodolak-Zych, Katarzyna Cholewa-Kowalska
The present work focuses on the state-of-the-art of biodegradable ceramic-polymer composites with particular emphasis on influence of various types of ceramic fillers on properties of the composites. First, the general needs to create composite materials for medical applications are briefly introduced. Second, various types of polymeric materials used as matrices of ceramic-containing composites and their properties are reviewed. Third, silica nanocomposites and their material as well as biological characteristics are presented...
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
#12
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/27982186/the-effect-of-hydrofluoric-acid-concentration-and-heat-on-the-bonding-to-lithium-disilicate-glass-ceramic
#13
Daniel Sundfeld, Lourenço Correr-Sobrinho, Núbia Inocêncya Pavesi Pini, Ana Rosa Costa, Renato Herman Sundfeld, Carmem Silvia Pfeifer, Luis Roberto Marcondes Martins
The aim of this study was to evaluate the effects of hydrofluoric acid (HF) concentration and previous heat treatment (PHT) on the surface morphology and micro-shear bond strength (mSBS) of a lithium disilicate glass ceramic (EMX) to resin cement. One hundred four EMX specimens were randomly assigned to two groups (n=52) according to the HF concentration: 5% and 10%. A new random distribution was made according to the PHTs (n=13): control (no PHT); previously heated HF (70 °C); previously heated EMX surface (85 °C); the combination of heated HF + heated EMX surface...
October 2016: Brazilian Dental Journal
https://www.readbyqxmd.com/read/27965501/effect-of-surface-treatments-on-the-bond-strength-to-turkom-cera-all-ceramic-material
#14
Abdul Aa Razak, Mohamed I Abu-Hassan, Bandar Ma Al-Makramani, Fuad A Al-Sanabani, Ibrahim Z Al-Shami, Hosain M Almansour
AIM: The aim of this study was to evaluate the effect of surface treatments on shear bond strength (SBS) of Turkom-Cera (Turkom-Ceramic (M) Sdn. Bhd., Puchong, Malaysia) all-ceramic material cemented with resin cement Panavia-F (Kuraray Medical Inc., Okayama, Japan). MATERIALS AND METHODS: Forty Turkom-Cera ceramic disks (10 mm × 3 mm) were prepared and randomly divided into four groups. The disks were wet ground to 1000-grit and subjected to four surface treatments: (1) No treatment (Control), (2) sandblasting, (3) silane application, and (4) sandblasting + silane...
November 1, 2016: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/27965493/new-single-bottle-ceramic-primer-6-month-case-report-and-laboratory-performance
#15
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/27964931/the-effect-of-extended-aging-on-the-optical-properties-of-different-zirconia-materials
#16
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
https://www.readbyqxmd.com/read/27956591/novel-molecular-spectroscopic-multimethod-approach-for-monitoring-water-absorption-desorption-kinetics-of-cad-cam-poly-methyl-methacrylate-prosthodontics
#17
Verena Wiedemair, Sophia Mayr, Daniel S Wimmer, Eva Maria Köck, Simon Penner, Andreas Kerstan, Patricia-Anca Steinmassl, Herbert Dumfahrt, Christian W Huck
Water absorbed to poly(methyl methacrylate) (PMMA)-based CAD/CAM (computer-assisted design/computer-assisted manufacturing) prosthodontics can alter their properties including hardness and stability. In the present contribution, water absorption and desorption kinetics under defined experimental conditions were monitored employing several supplementary and advanced Fourier transform infrared (FT-IR) spectroscopic techniques in combination with multivariate analysis (MVA). In this synergistic vibrational spectroscopic multimethod approach, first a novel near-infrared (NIR) diffuse fiber optic probe reflection spectroscopic method was established for time-resolved analysis of water uptake within seven days under controlled conditions...
December 12, 2016: Applied Spectroscopy
https://www.readbyqxmd.com/read/27942768/mechanical-properties-of-different-esthetic-and-conventional-orthodontic-wires-in-bending-tests-an-in-vitro-study
#18
Ahmad Alobeid, Cornelius Dirk, Susanne Reimann, Tarek El-Bialy, Andreas Jäger, Christoph Bourauel
AIMS: The goal of this study was to determine the mechanical properties of different esthetic and conventional orthodontic wires in three-point and four-point bending tests, and in a biomechanical test employing three bracket systems. METHODS: The behavior of round wires with a diameter of 0.46 mm (0.018″) were investigated: uncoated nickel titanium (NiTi) wires, surface modified NiTi wires; FLI(®) Orthonol Wire(®) and glass fiber reinforced plastic wires. The biomechanical bending test was performed using the following bracket types: metal brackets (Discovery(®), Dentaurum), ceramic brackets (Fascination(®), Dentaurum), and plastic brackets (Elegance(®), Dentaurum)...
December 9, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/27933322/silicone-disclosing-material-used-after-ceramic-surface-treatment-reduces-bond-strength
#19
Sara Fraga, Sara Cioccari Oliveira, Gabriel Kalil Rocha Pereira, Pieter Beekman, Marília Pivetta Rippe, Cornelis J Kleverlaan
PURPOSE: To evaluate the effect of a silicone disclosing procedure performed at different timepoints on the shear bond strength (SBS) of cements (self-adhesive composite cement, self-etch composite cement, resin-reinforced glass-ionomer cement) to different substrates (zirconia, lithium disilicate, bovine dentin). MATERIALS AND METHODS: The substrate/cement combinations were assigned to two groups (n = 15) according to the timepoint, at which the vinyl polyether silicone disclosing agent was applied: after (experimental groups, EXP) or before (control groups, CTRL) specific micromechanical treatments of the substrate surface...
December 8, 2016: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/27924866/pressure-induced-nano-crystallization-of-silicate-garnets-from-glass
#20
T Irifune, K Kawakami, T Arimoto, H Ohfuji, T Kunimoto, T Shinmei
Transparent ceramics are important for scientific and industrial applications because of the superior optical and mechanical properties. It has been suggested that optical transparency and mechanical strength are substantially enhanced if transparent ceramics with nano-crystals are available. However, synthesis of the highly transparent nano-crystalline ceramics has been difficult using conventional sintering techniques at relatively low pressures. Here we show direct conversion from bulk glass starting material in mutianvil high-pressure apparatus leads to pore-free nano-polycrystalline silicate garnet at pressures above ∼10 GPa in a limited temperature range around 1,400 °C...
December 7, 2016: Nature Communications
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