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https://www.readbyqxmd.com/read/28343675/influence-of-surface-finishing-on-fracture-load-and-failure-mode-of-glass-ceramic-crowns
#1
Rafael Tagliari Mores, Márcia Borba, Pedro Henrique Corazza, Álvaro Della Bona, Paula Benetti
STATEMENT OF PROBLEM: Ceramic restorations often require adjustments using diamond rotary instruments, which damage the glazed surface. The effect of these adjustments on the fracture behavior of these restorations is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the influence of induced surface defects on the fracture load and mode of failure of lithium disilicate-based (LDS) glass ceramic restorations. MATERIAL AND METHODS: Premolar crowns were obtained from LDS computer-aided design and computer-aided manufacturing blocks (n=60) and glazed...
March 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28304023/peptide-functionalized-gold-nanoparticles-versatile-biomaterials-for-diagnostic-and-therapeutic-applications
#2
REVIEW
Jingyi Zong, Steven L Cobb, Neil R Cameron
Colloidal gold solutions have been used for centuries in a wide variety of applications including staining glass and in the colouring of ceramics. More recently, gold nanoparticles (GNPs) have been studied extensively due to their interesting size-dependent electronic and optical properties. GNPs can be functionalized easily with biomolecules that contain thiols, amines, or even phosphine moieties. For example, the reaction of thiol-containing peptides with GNPs has been used extensively to prepare novel hybrid materials for biomedical applications...
March 17, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/28303948/transparent-polycrystalline-cubic-silicon-nitride
#3
Norimasa Nishiyama, Ryo Ishikawa, Hiroaki Ohfuji, Hauke Marquardt, Alexander Kurnosov, Takashi Taniguchi, Byung-Nam Kim, Hidehiro Yoshida, Atsunobu Masuno, Jozef Bednarcik, Eleonora Kulik, Yuichi Ikuhara, Fumihiro Wakai, Tetsuo Irifune
Glasses and single crystals have traditionally been used as optical windows. Recently, there has been a high demand for harder and tougher optical windows that are able to endure severe conditions. Transparent polycrystalline ceramics can fulfill this demand because of their superior mechanical properties. It is known that polycrystalline ceramics with a spinel structure in compositions of MgAl2O4 and aluminum oxynitride (γ-AlON) show high optical transparency. Here we report the synthesis of the hardest transparent spinel ceramic, i...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28279435/three-dimensional-characterization-and-distribution-of-fabrication-defects-in-bilayered-lithium-disilicate-glass-ceramic-molar-crowns
#4
Yutao Jian, Zi-Hua He, Li Dao, Michael V Swain, Xin-Ping Zhang, Ke Zhao
OBJECTIVE: To investigate and characterize the distribution of fabrication defects in bilayered lithium disilicate glass-ceramic (LDG) crowns using micro-CT and 3D reconstruction. METHODS: Ten standardized molar crowns (IPS e.max Press; Ivoclar Vivadent) were fabricated by heat-pressing on a core and subsequent manual veneering. All crowns were scanned by micro-CT and 3D reconstructed. Volume, position and sphericity of each defect was measured in every crown. Each crown was divided into four regions-central fossa (CF), occlusal fossa (OF), cusp (C) and axial wall (AW)...
March 6, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28278768/effects-of-waste-glass-and-waste-foundry-sand-additions-on-reclaimed-tiles-containing-sewage-sludge-ash
#5
Deng-Fong Lin, Huan-Lin Luo, Kuo-Liang Lin, Zhe-Kun Liu
Applying sewage sludge ash (SSA) to produce reclaimed tiles is a promising recycling technology in resolving the increasing sludge wastes from wastewater treatment. However, performance of such reclaimed tiles is inferior to that of original ceramic tiles. Many researchers have therefore tried adding various industrial by-products to improve reclaimed tile properties. In this study, multiple materials including waste glass and waste foundry sand (WFS) were added in an attempt to improve physical and mechanical properties of reclaimed tiles with SSA...
March 3, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28275786/-effects-of-repeated-firing-on-microleakage-of-selective-laser-melting-ceramic-crowns
#6
Qun Zhong, Yan Peng, Xue-Ying Wu, Jia-Wei Weng
PURPOSE: To investigate the effects of repeated firing on microleakage of selective laser melting ceramic crowns. METHODS: Fifty molars were randomly divided into 2 groups (25 teeth in each group). Teeth in group A received a chamfer finish line preparation, whereas teeth in group B received a shoulder finish line. After SLM metal crowns were fabricated, all the crowns received initial oxidation step, opaque firing, dentin firing and glaze firing, then crowns in each group were randomly divided into 5 sub-groups according to different time of clinical firings...
December 2016: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
https://www.readbyqxmd.com/read/28267829/success-and-survival-of-various-types-of-all-ceramic-single-crowns-a-critical-review-and-analysis-of-studies-with-a-mean-follow-up-of-5-years-or-longer
#7
Alhanoof Aldegheishem, George Ioannidis, Wael Att, Haralampos Petridis
PURPOSE: The aim of this critical review was to assess the survival and success rates of all-ceramic single crowns manufactured using different ceramic materials with a mean follow-up time of 5 years or longer. MATERIALS AND METHODS: An electronic search of studies published between 1980 and 2014 complemented by manual searching was conducted in Medline and Scopus. The terms ceramic, crown, survival, success, longevity, and complications were selected as keywords...
March 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28266570/spectroscopic-properties-in-er-3-doped-germanotellurite-glasses-and-glass-ceramics-for-mid-infrared-laser-materials
#8
Shiliang Kang, Xiudi Xiao, Qiwen Pan, Dongdan Chen, Jianrong Qiu, Guoping Dong
Transparent Er(3+)-doped germanotellurite glass ceramics (GCs) with variable Te/Ge ratio were prepared by controllable heat-treated process. X-ray diffraction (XRD) and transmission electron microscope (TEM) confirmed the formation of nanocrystals in glass matrix. Raman spectra were used to investigate the evolution of glass structure and photon energy. Fourier transform infrared (FTIR) spectra were introduced to characterize the change of hydroxyl group (OH(-)) content. Enhanced 2.7 μm emission was achieved from Er(3+)-doped GCs upon excitation with a 980 nm laser diode (LD), and the influence of GeO2 concentration and heat-treated temperature on the spectroscopic properties were also discussed in detail...
March 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28258266/effect-of-newly-developed-resin-cements-and-thermocycling-on-the-strength-of-porcelain-laminate-veneers
#9
Fawaz I Alqahtani
AIM: The aim of this study was to determine the effect of different luting cements and accelerated artificial aging (AAA) in the fracture resistance of porcelain laminate veneers (PLVs). MATERIALS AND METHODS: A total of 80 disc-shaped specimens were prepared using computer-aided design/computer-aided milling technology from lithium disilicate glass-ceramic blocks. Specimens (0.5 mm thick, 10 mm diameter) were divided into eight groups of 10 specimens per group...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28257251/interfacial-characteristics-and-bond-durability-of-universal-adhesive-to-various-substrates
#10
A Tsujimoto, W W Barkmeier, T Takamizawa, T M Wilwerding, M A Latta, M Miyazaki
OBJECTIVE: This study investigated the interfacial characteristics and bond durability of universal adhesives to various substrates. METHODS AND MATERIALS: Two universal adhesives were used: 1) Scotchbond Universal and 2) G-Premio Bond. The substrates used were bovine enamel and dentin with or without phosphoric acid etching, resin composite, lithium disilicate and leucite-reinforced glass ceramics, zirconia, and metal alloys. The surface free energy and the parameters of various substrates and of substrates treated by adhesive after light irradiation were determined by measuring the contact angles of three test liquids...
March 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28242456/the-proangiogenic-potential-of-a-novel-calcium-releasing-composite-biomaterial-orthotopic-in-vivo-evaluation
#11
Hugo Oliveira, Sylvain Catros, Oscar Castano, Sylvie Rey, Robin Siadous, Douglas Clift, Joan Marti-Munoz, Marc Batista, Reine Bareille, Josep Planell, Elisabeth Engel, Joëlle Amédée
Insufficient angiogenesis remains a major hurdle in current bone tissue engineering strategies. An extensive body of work has focused on the use of angiogenic factors or endothelial progenitor cells. However, these approaches are inherently complex, in terms of regulatory and methodologic implementation, and present a high cost. We have recently demonstrate the potential of electrospun poly(lactic acid) (PLA) fiber-based membranes, containing calcium phosphate (CaP) ormoglass particles, to elicit angiogenesis in vivo, in a subcutaneous model in mice...
February 24, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28238306/effect-of-hydrothermal-treatment-on-light-transmission-of-translucent-zirconias
#12
Armand Putra, Kwok-Hung Chung, Brian D Flinn, Tuesday Kuykendall, Cheng Zheng, Kosuke Harada, Ariel J Raigrodski
STATEMENT OF PROBLEM: Studies of the light transmission of translucent zirconias after hydrothermal treatment are limited. PURPOSE: The purpose of this in vitro study was to evaluate the effect of hydrothermal treatment on the light transmission of translucent zirconias for monolithic restorations. MATERIAL AND METHODS: Four commercially available zirconia products, BruxZir Anterior Solid Zirconia (BruxAnt, BA), Lava Plus High Translucency (LPHT), Katana Zirconia Super Translucent (KST), and Katana Zirconia Ultra Translucent (KUT) were assessed and 1 type of lithium disilicate, e...
February 18, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222866/shear-bond-strength-of-zirconia-based-ceramics-veneered-with-2-different-techniques
#13
Ahmed M Zaher, J L Hochstedler, Frederick A Rueggeberg, Edwin L Kee
STATEMENT OF PROBLEM: Delamination of veneering ceramic is reported as one of the most frequent problems associated with veneered zirconia restorations. PURPOSE: The purpose of this in vitro study was to compare the shear bond strength of sintered lithium disilicate to that of pressed fluorapatite glass-ceramic on a zirconia substrate. MATERIAL AND METHODS: Thirty zirconia blocks (20×15×2.5-mm thick) were cut, sintered, and divided into 2 groups...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28221913/an-immunoassay-for-quantification-of-contamination-by-raw-meat-juice-on-food-contact-surfaces
#14
Fur-Chi Chen, Sandria Godwin, Edgar Chambers
Raw chicken products often are contaminated with Salmonella and Campylobacter , which can be transmitted from packages to contact surfaces. Raw meat juices from these packages also provide potential media for cross-contamination. There are limited quantitative data on the levels of consumer exposure to raw meat juice during shopping for and handling of chicken products. An exposure assessment is needed to quantify the levels of transmission and to assess the risk. An enzyme-linked immunosorbent assay (ELISA) was developed and validated for quantitative detection of raw meat juice on hands and various food contact surfaces...
November 2016: Journal of Food Protection
https://www.readbyqxmd.com/read/28214537/biomechanical-behavior-of-endodontically-treated-premolars-using-different-preparation-designs-and-cad-cam-materials
#15
Diogo Pedrollo Lise, Annelies Van Ende, Jan De Munck, Thaís Yumi Umeda Suzuki, Luiz Clovis Cardoso Vieira, Bart Van Meerbeek
OBJECTIVES: To evaluate the effect of restoration design ('2.5-mm deep endocrown', '5-mm deep endocrown' or '5-mm deep post&crown') and CAD/CAM material type (composite or lithium disilicate glass-ceramic) on the load-to-failure of endodontically treated premolars in absence of any ferrule. METHODS: The crowns of 48 single-rooted premolars were cut and the roots were endodontically treated. Teeth were randomly divided into six groups (n=8); teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2...
February 15, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28213184/forensic-applications-fluorescence-properties-of-tooth-coloured-restorative-materials-using-a-fluorescence-dslr-camera
#16
Ramya Kiran, Laurence J Walsh, Alexander Forrest, Marc Tennant, James Chapman
The objective of this study was to compare the fluorescence properties of dry and wet samples of contemporary tooth-coloured restorative materials using a fluorescence based DSLR camera and a variety of LEDs emitting different wavelengths of visible light as excitation sources. The materials examined included resin composites; ceramics and hybrid restorative materials such as ormocers, Vita Enamic™ and resin reinforced glass-ionomer cements. The levels of fluorescence for each sample under different combinations of incident light wavelengths and filters was analysed by using histogram data for colour channels from Adobe Photoshop software...
February 3, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28209033/in-vitro-investigation-of-bioactive-glass-ceramic-composites-based-on-biogenic-hydroxyapatite-or-synthetic-calcium-phosphates
#17
Nataliia Pinchuk, Oleksandr Parkhomey, Olena Sych
This in vitro investigation of the behavior of two types of calcium phosphate glass ceramics on the basis of phosphates of biogenic or synthetic origin prepared from initial mixtures with different particle size has revealed that some different factors affect the behavior, namely the phase composition of composite, fraction of open porosity, and average diameter of pore channels. It was established that the solubility of the composites on the basis of synthetic calcium phosphates and glass after 2 and 7 days contact with saline composites is the highest among the materials under study...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28209008/effect-of-resin-bonded-luting-agents-influencing-marginal-discrepancy-in-all-ceramic-complete-veneer-crowns
#18
Dhanraj Ganapathy, Anusha Sathyamoorthy, Hemalatha Ranganathan, Karthikeyan Murthykumar
INTRODUCTION: Marginal discrepancy severely affects the long term success of All ceramic complete veneer crowns. The precise role of resin luting agents influencing this phenomenon needs to be explored further. AIM: To estimate and compare the marginal discrepancy in CAD/CAM processed All ceramic complete veneer crowns prior and following luting with resin bonded luting agents. MATERIALS AND METHODS: Extracted human maxillary first premolars were randomly allocated into four groups of 27 samples each Viz...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28196165/effect-of-cervical-collar-removal-on-the-fracture-load-of-anterior-zirconia-crowns
#19
Fernanda Campos, Mayra Cardoso, Renata Marques de Melo, Marco Antonio Bottino, Rodrigo Oa Souza
The objective of this study was to assess the influence of the extension of collar and fatigue cycling on the fracture load of anterior zirconia crowns. A total of 60 anterior full-crown preparations (central incisor) were machined in glass fiber-filled epoxy resin. Zirconia copings were designed and milled using computer-aided design/computer-assisted manufacture (thickness: buccal = 0.62 mm, lingual = 0.65 mm, incisal = 0.72 mm). The cervical collars (occlusogingival height = 0.8 mm, buccolingual width = 1...
March 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/28195190/modeling-of-amorphous-sicxo6-5-by-classical-molecular-dynamics-and-first-principles-calculations
#20
Ningbo Liao, Miao Zhang, Hongming Zhou, Wei Xue
Polymer-derived silicon oxycarbide (SiCO) presents excellent performance for high temperature and lithium-ion battery applications. Current experiments have provided some information on nano-structure of SiCO, while it is very challenging for experiments to take further insight into the molecular structure and its relationship with properties of materials. In this work, molecular dynamics (MD) based on empirical potential and first principle calculation were combined to investigate amorphous SiCxO6/5 ceramics...
February 14, 2017: Scientific Reports
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