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https://www.readbyqxmd.com/read/28747698/adjustable-multicolor-up-energy-conversion-in-light-luminesce-in-tb-3-tm-3-yb-3-co-doped-oxyfluoriffde-glass-ceramics-containing-ba2laf7-nanocrystals
#1
Zhencai Li, Dacheng Zhou, Yong Yang, Peng Ren, Jianbei Qiu
Transparent oxyfluoride glasses with highly efficient up-energy conversion (UEC) luminescence were developed in the 45SiO2-15Al2O3-12Na2CO3-21BaF2-7LaF3-xTbF3-yTmF3-zYbF3 composition (in mol%), and structural investigation by X-ray diffraction (XRD) and transmission electron microscopy (TEM) confirmed the formation of face-centered cubic Ba2LaF7 nanocrystals. The colors of UEC luminescences could be tuned easily by adjusting the concentration of doped rare earth ions and the excitation power of laser simultaneously...
July 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717632/effect-of-different-intracoronal-bleaching-methods-on-shear-bond-strength-of-ceramic-brackets-bonded-to-bleached-enamel-an-in-vitro-study
#2
Vikas Chauhan, Piush Kumar, Payal Sharma, Divya Shetty
OBJECTIVE: To investigate the effect of different intracoronal bleaching methods on the shear bond strength and site of failure of ceramic brackets. MATERIALS AND METHODS: Sixty freshly extracted human maxillary incisors were randomly divided into four groups (n = 15). Endodontic access cavity was prepared and root canals were filled, root fillings were removed 2mm apical to the cementoenamel junction, and a 2-mmthick layer of glass ionomer cement base was applied...
July 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28712740/aspects-of-adhesion-tests-on-resin-glass-ceramic-bonding
#3
Andrew Chi Ho Wong, Tian Tian, James Kit Hon Tsoi, Michael Francis Burrow, Jukka Pekka Matinlinna
OBJECTIVES: This study aimed to compare and contrast two resin-ceramic bond strength tests, the tensile bond strength and the four-point bending tests. The effects of hydrofluoric acid (HF) etching time and storage condition on bond strength were also studied. METHODS: Ceramic beams (N=480) with the dimensions of 2.00×2.00×12.45mm(3) were sectioned from lithium disilicate ceramic ingots (IPS e.max CAD), then polished and fired for final crystallization. The joint surfaces were etched with HF gel (IPS Ceramic etching gel) for 20s, 40s, or 60s of each group (n=160)...
July 13, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28708007/effect-of-hydrofluoric-acid-concentration-and-etching-time-on-bond-strength-to-lithium-disilicate-glass-ceramic
#4
J Puppin-Rontani, D Sundfeld, A R Costa, A B Correr, R M Puppin-Rontani, G A Borges, Mac Sinhoreti, L Correr-Sobrinho
The aim of this study was to evaluate the influence of different concentrations of hydrofluoric acid (HF) associated with varied etching times on the microshear bond strength (μSBS) of a resin cement to a lithium disilicate glass ceramic. Two hundred seventy-five ceramic blocks (IPS e.max Press [EMX], Ivoclar Vivadent), measuring 8 mm × 3 mm thickness, were randomly distributed into five groups according to the HF concentrations (n=50): 1%, 2.5%, 5%, 7.5%, and 10%. Further random distribution into subgroups was performed according to the following etching times (n=10): 20, 40, 60, 120, and 20 + 20 seconds...
July 14, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28697772/injectable-and-compression-resistant-low-viscosity-polymer-ceramic-composite-carriers-for-rhbmp-2-in-a-rabbit-model-of-posterolateral-fusion-a-pilot-study
#5
Stefanie M Shiels, Anne D Talley, Madison A P McGough, Katarzyna J Zienkiewicz, Kerem Kalpakci, Daniel Shimko, Scott A Guelcher, Joseph C Wenke
BACKGROUND: The challenging biological and mechanical environment of posterolateral fusion (PLF) requires a carrier that spans the transverse processes and resists the compressive forces of the posterior musculature. The less traumatic posterolateral approach enabled by minimally invasive surgical techniques has prompted investigations into alternative rhBMP-2 carriers that are injectable, settable, and compression-resistant. In this pilot study, we investigated injectable low-viscosity (LV) polymer/composite bone grafts as compression-resistant carriers for rhBMP-2 in a single-level rabbit PLF model...
July 11, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28696704/polymer-rich-composite-electrolytes-for-all-solid-state-li-s-cells
#6
Xabier Judez, Heng Zhang, Chunmei Li, Gebrekidan Gebresilassie Eshetu, Yan Zhang, José Antonio González-Marcos, Michel Armand, Lide Mercedez Rodriguez-Martinez
Polymer-rich composite electrolytes with lithium bis(fluorosulfonyl)imide/poly(ethylene oxide) (LiFSI/PEO) containing either Li-ion conducting glass ceramic (LICGC) or inorganic Al2O3 fillers are investigated in all solid-state Li-S cells. In the presence of the fillers, the ionic conductivity of the composite polymer electrolytes (CPEs) does not increase compared to the plain LiFSI/PEO electrolyte at various tested temperatures. The CPE with Al2O3 fillers improves the stability of Li/electrolyte interphase, while the Li-S cell with LICGC-based CPE delivers high sulfur utilization of 1111 mAh g-1 and areal capacity of 1...
July 11, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28696363/candle-soot-coating-for-latent-fingermark-enhancement-on-various-surfaces
#7
Qianhui Wei, Yu Zhu, Shouliang Liu, Yongjie Gao, Xiaolong Li, Mi Shi, Xueji Zhang, Meiqin Zhang
We demonstrate a facile method termed candle soot coating (CSC) for fast developing latent fingermarks (LFMs) on various kinds of surfaces (glass, ceramic, metal, paper and adhesive tape). The CSC method can be considered as simple, fast, and low-cost as well as providing high contrast for LFM visualization in potential forensic applications.
July 11, 2017: Sensors
https://www.readbyqxmd.com/read/28689909/effects-of-core-and-veneer-thicknesses-on-the-color-of-cad-cam-lithium-disilicate-ceramics
#8
Wol Kang, Jong-Kyoung Park, So-Ri Kim, Woong-Chul Kim, Ji-Hwan Kim
STATEMENT OF PROBLEM: The color of dental ceramics is important for achieving successful esthetic restorations. However, insufficient studies are available of the color of recently introduced computer-aided design-computer-aided manufacturing (CAD-CAM) lithium disilicate ceramics as functions of the core and veneer thicknesses. PURPOSE: The purpose of this in vitro study was to evaluate the effects of the thickness of different core and veneer thicknesses on the color of CAD-CAM lithium disilicate ceramics...
July 6, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28682548/-polishing-performance-of-different-polishing-tools-for-cerec-blocs-ceramic
#9
Wang Tao, Guo Zhenwei, Guo Huijing, Qiao Xianghe
OBJECTIVE: This study aimed to compare the polishing performance of five different glass-ceramic polishing tools on CEREC Blocs ceramic and provide evidence for clinical polishing tool selection. METHODS: Sixty ceramic specimens were prepared and divided into six groups (n=10). These specimens received different surface treatments, including glazing (group G), polishing with Shofu polishing set, that is, Porcelain Adjustment Kit+CeraMaster (group SF), 3M Sof-LexTM Discs (group 3M), TobooM polishing set (group Tob), EVE DIAPRO system (group EVE), and Ivoclar Vivadent OptraFine® system (group Ivo)...
April 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28680547/fracture-resistances-of-zirconia-cast-ni-cr-and-fiber-glass-composite-posts-under-all-ceramic-crowns-in-endodontically-treated-premolars
#10
Sareh Habibzadeh, Hamid Reza Rajati, Habib Hajmiragha, Shima Esmailzadeh, Mohamadjavad Kharazifard
PURPOSE: The aim of the present study was to evaluate the fracture resistances of zirconia, cast nickel-chromium alloy (Ni-Cr), and fiber-composite post systems under all-ceramic crowns in endodontically treated mandibular first premolars. MATERIALS AND METHODS: A total of 36 extracted human mandibular premolars were selected, subjected to standard endodontic treatment, and divided into three groups (n=12) as follows: cast Ni-Cr post-and-core, one-piece custom-milled zirconia post-and-core, and prefabricated fiber-glass post with composite resin core...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28676434/multifunctional-bioactive-glass-and-glass-ceramic-biomaterials-with-antibacterial-properties-for-repair-and-regeneration-of-bone-tissue
#11
REVIEW
João S Fernandes, Piergiorgio Gentile, Ricardo A Pires, Rui L Reis, Paul V Hatton
Bioactive glasses (BGs) and related glass-ceramic biomaterials have been used in bone tissue repair for over 30years. Previous work in this field was comprehensively reviewed including by their inventor Larry Hench, and the key features and properties of BGs are well understood. More recently, attention has focused on their modification to further enhance the osteogenic behaviour, or further compositional changes that may introduce additional properties, such as antimicrobial activity. Evidence is emerging that BGs and related glass-ceramics may be modified in such a way as to simultaneously introduce more than one desirable property...
July 1, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28675436/effect-of-teapot-materials-on-the-chemical-compositions-of-oolong-tea-infusion
#12
Zih-Hui Liao, Ying-Jie Chen, Jason Tze-Cheng Tzen, Ping-Chung Kuo, Maw-Rong Lee, Fu-Der Mai, Tirawat Rairat, Chi-Chung Chou
BACKGROUND: The flavor and quality of tea is widely believed to be associated with the pot the tea is made in. However, this claim is mostly by experience and lack solid support from scientific evidences. The current study investigated and compared the chemical compositions of oolong tea made from 6 teapot materials-Zisha, Zhuni, stainless steel, ceramic, glass, and plastic. RESULTS: For each tea sample, polyphenols and caffeine were examined by HPLC/UV, volatile compounds by GC/MS, amino acids by LC/MS, and minerals content by ICP/MS...
July 4, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28662861/the-influence-of-y-tzp-surface-treatment-on-topography-and-ceramic-resin-cement-interfacial-fracture-toughness
#13
P N G Paes, F L Bastian, P M Jardim
OBJECTIVE: Consider the efficacy of glass infiltration etching (SIE) treatment as a procedure to modify the zirconia surface resulting in higher interfacial fracture toughness. METHODS: Y-TZP was subjected to 5 different surface treatments conditions consisting of no treatment (G1), SIE followed by hydrofluoric acid treatment (G2), heat treated at 750°C (G3), hydrofluoric acid treated (G4) and airborne-particle abrasion with alumina particles (G5). The effect of surface treatment on roughness was evaluated by Atomic Force Microscopy providing three different parameters: Ra, Rsk and surface area variation...
June 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28662858/comparison-of-three-and-four-point-bending-evaluation-of-two-adhesive-bonding-systems-for-glass-ceramic-zirconia-bi-layered-ceramics
#14
C Gee, J N Weddell, M V Swain
OBJECTIVES: To quantify the adhesion of two bonding approaches of zirconia to more aesthetic glass-ceramic materials using the Schwickerath (ISO 9693-2:2016) three point bend (3PB) [1] test to determine the fracture initiation strength and strain energy release rate associated with stable crack extension with this test and the Charalamabides et al. (1989) [2] four point bend (4PB) test. METHODS: Two glass-ceramic materials (VITABLOCS Triluxe forte, Vita Zahnfabrik, Germany and IPS...
June 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28662857/glass-ceramic-coating-material-for-the-co2-laser-based-sintering-of-thin-films-as-caries-and-erosion-protection
#15
Marin Dean Bilandžić, Susanne Wollgarten, Jochen Stollenwerk, Reinhart Poprawe, Marcella Esteves-Oliveira, Horst Fischer
OBJECTIVES: The established method of fissure-sealing using polymeric coating materials exhibits limitations on the long-term. Here, we present a novel technique with the potential to protect susceptible teeth against caries and erosion. We hypothesized that a tailored glass-ceramic material could be sprayed onto enamel-like substrates to create superior adhesion properties after sintering by a CO2 laser beam. METHODS: A powdered dental glass-ceramic material from the system SiO2-Na2O-K2O-CaO-Al2O3-MgO was adjusted with individual properties suitable for a spray coating process...
June 26, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28651905/self-etching-ceramic-primer-versus-hydrofluoric-acid-etching-etching-efficacy-and-bonding-performance
#16
Hatem M El-Damanhoury, Maria D Gaintantzopoulou
AIM: This study assessed the effect of pretreatment of hybrid and glass ceramics using a self-etching primer on the shear bond strength (SBS) and surface topography, in comparison to pretreatment with hydrofluoric acid and silane. METHODS: 40 rectangular discs from each ceramic material (IPS e.max CAD;EM, Vita Mark II;VM, Vita Enamic;VE), were equally divided (n=10) and assigned to one of four surface pretreatment methods; etching with 4.8% hydrofluoric acid followed by Monobond plus (HFMP), Monobond etch & prime (Ivoclar Vivadent) (MEP), No treatment (NT) as negative control and Monobond plus (Ivoclar Vivadent) with no etching (MP) as positive control...
June 23, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28646212/direct-observation-of-a-non-crystalline-state-of-li2s-p2s5-solid-electrolytes
#17
Hirofumi Tsukasaki, Shigeo Mori, Hideyuki Morimoto, Akitoshi Hayashi, Masahiro Tatsumisago
There are two types of solid electrolytes which has been recently expected to be applied to all-solid-state batteries. One is the glasses characterized by an amorphous state. The other is the glass ceramics containing crystalline in an amorphous matrix. However, the non-crystalline state of glasses and glass ceramics is still an open question. It has been anticipated that sea-island and core-shell structures including crystalline nanoparticles have been proposed as candidate models for glass ceramics. Nevertheless, no direct observation has been conducted so far...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28645667/effect-of-different-restorative-crown-and-customized-abutment-materials-on-stress-distribution-in-single-implants-and-peripheral-bone-a-three-dimensional-finite-element-analysis-study
#18
Necati Kaleli, Duygu Sarac, Safak Külünk, Özgür Öztürk
STATEMENT OF PROBLEM: In recent years, the use of resin-matrix ceramics and polyetheretherketone (PEEK) abutments has been suggested to absorb excessive stresses on dental implants. However, only a few studies have evaluated the effect of these materials on stress distribution in implants and peripheral bone structure. PURPOSE: The purpose of this finite element analysis was to evaluate the biomechanical behaviors of resin-matrix ceramics and PEEK customized abutments in terms of stress distribution in implants and peripheral bone...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28645068/fracture-roughness-and-phase-transformation-in-cad-cam-milling-and-subsequent-surface-treatments-of-lithium-metasilicate-disilicate-glass-ceramics
#19
Abdur-Rasheed Alao, Richard Stoll, Xiao-Fei Song, John R Abbott, Yu Zhang, Jaafar Abduo, Ling Yin
This paper studied surface fracture, roughness and morphology, phase transformations, and material removal mechanisms of lithium metasilicate/disilicate glass ceramics (LMGC/LDGC) in CAD/CAM-milling and subsequent surface treatments. LMGC (IPS e.max CAD) blocks were milled using a chairside dental CAD/CAM milling unit and then treated in sintering, polishing and glazing processes. X-ray diffraction was performed on all processed surfaces. Scanning electron microscopy (SEM) was applied to analyse surface fracture and morphology...
June 15, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28636267/strontium-releasing-fluorapatite-glass-ceramics-crystallization-behavior-microstructure-and-solubility
#20
Isabelle Denry, Ourania-Menti Goudouri, Jeffrey D Harless, E M Hubbard, Julie A Holloway
The purpose of this work was to investigate the effect of strontium partial replacement for calcium on the crystallization behavior, microstructure and solubility of fluorapatite glass-ceramics. Four glass compositions were prepared with increasing amounts of strontium partially replacing calcium. The crystallization behavior was analyzed by differential scanning calorimetry and X-ray diffraction (XRD). The microstructure was investigated by scanning electron microscopy. The chemical solubility was quantified according to ISO standard 10993-14...
June 21, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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