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glass ceramic

Morgane Dolhen, Masayuki Tanaka, Vincent Couderc, Sébastien Chenu, Gaëlle Delaizir, Tomokatsu Hayakawa, Julie Cornette, François Brisset, Maggy Colas, Philippe Thomas, Jean-René Duclère
We report on the laser emission of the polycrystalline ceramic obtained from the full and congruent crystallization of the parent glass 1Nd3+ :75TeO2 -12.5Bi2 O3 -12.5Nb2 O5 composition. In particular, the current work underlines the importance of carefully controlling the heat treatment in order to solely crystallize the Bi0.8 Nb0.8 Te2.4 O8 cubic phase and consequently avoid the formation of the BiNbTe2 O8 orthorhombic phase that would be detrimental for optical purpose. The structure, microstructure and photoluminescence properties of the resulting transparent tellurite ceramics are characterized...
March 15, 2018: Scientific Reports
Stefanie Amend, Roland Frankenberger, Susanne Lücker, Eugen Domann, Norbert Krämer
OBJECTIVES: The present study aimed to establish Lactobacillus casei in a completely automated Streptococcus mutans-based artificial mouth model and to investigate secondary caries inhibiting properties of glass ionomer cements / resin composite groups in vitro. METHODS: Sixty extracted, caries-free human third molars were used for preparation of standardized class-V-cavities. Specimens were restored with a resin-modified (Photac Fil; PF) as well as a conventional glass ionomer cement (Ketac Molar; KM) and one resin composite bonded with and without conduction of etch-and-rinse technique (Prime&Bond NT, Ceram X mono; C+ERT, C)...
March 12, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Jex Ong, A U Yap, J Y Hong, A H Eweis, N A Yahya
This study investigated the viscoelastic properties of contemporary bulk-fill restoratives in distilled water and artificial saliva using dynamic mechanical analysis. The materials evaluated included a conventional composite (Filtek Z350), two bulk-fill composites (Filtek Bulk-fill and Tetric N Ceram), a bulk-fill giomer (Beautifil-Bulk Restorative), and two novel reinforced glass ionomer cements (Zirconomer [ZR] and Equia Forte [EQ]). The glass ionomer materials were also assessed with and without resin coating (Equia Forte Coat)...
March 13, 2018: Operative Dentistry
Irena Sailer, Asgeir G Asgeirsson, Daniel S Thoma, Vincent Fehmer, Thor Aspelund, Mutlu Özcan, Bjarni E Pjetursson
BACKGROUND: There is limited knowledge regarding the strength of zirconia abutments with internal and external implant abutment connections and zirconia abutments supported by a titanium resin base (Variobase, Straumann) for narrow diameter implants. OBJECTIVES: To compare the fracture strength of narrow diameter abutments with different types of implant abutment connections after chewing simulation. MATERIAL AND METHODS: Hundred and twenty identical customized abutments with different materials and implant abutment connections were fabricated for five groups: 1-piece zirconia abutment with internal connection (T1, Cares-abutment-Straumann BL-NC implant, Straumann Switzerland), 1-piece zirconia abutment with external hex connection (T2, Procera abutment-Branemark NP implant, Nobel Biocare, Sweden), 2-piece zirconia abutments with metallic insert for internal connection (T3, Procera abutment-Replace NP implant, Nobel Biocare), 2-piece zirconia abutment on titanium resin base (T4, LavaPlus abutment-VarioBase-Straumann BL-NC implant, 3M ESPE, Germany) and 1-piece titanium abutment with internal connection (C, Cares-abutment-Straumann BL-NC implant, Straumann, Switzerland)...
March 11, 2018: Clinical Oral Implants Research
Chenmin Yao, Jian Yu, Yake Wang, Chuliang Tang, Cui Huang
OBJECTIVES: Some silane-containing universal adhesives were introduced that a separate ceramic primer was unnecessary to glass-ceramic bonding because of incorporated silane. We aimed to investigate the effectiveness of silane in universal adhesives with acidic media. METHODS: A functional γ-methacryloxypropyltrimethoxysilane (γ-MPTS) was used, and its pH value was adjusted to 2.7 by adding hydrochloric acid (HCl) or 10-methacryloxydecyl phosphate (MDP). The prepared acidic silane solutions after 2h or 10d storage were characterized by Fourier transform infrared spectroscopy (FTIR),1 H and13 C nuclear magnetic resonance (NMR) spectroscopy...
March 7, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Praveen Jha, Satwinder Singh Danewalia, Gaurav Sharma, K Singh
Glasses with composition 55SiO2 -10K2 O-(35-x)CaO-xMgO (x = 5, 10, 15 up to 35) were prepared via conventional melt-quench technique. The glasses were converted to glass-ceramics by controlled heat-treatment at 850 °C. Higher content of MgO instead of CaO prevents the devitrification of the glasses. The in-vitro bioactivity of the glasses/glass-ceramics was evaluated in simulated body fluid (SBF). Glasses exhibited better bioactivity than the glass-ceramics. The weight loss and ions leaching profiles (especially potassium ions) of the samples played crucial role in formation of hydroxyapatite layer and its morphology...
May 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
Maren Teichmann, Anna Lena Wienert, Marcia Rückbeil, Volker Weber, Stefan Wolfart, Daniel Edelhoff
OBJECTIVES: To prospectively evaluate the clinical long-term outcome of 3- to 6-unit fixed dental prostheses (FDPs) made of hot isostatic pressed (HIP) zirconia frameworks, veneered with a synthetic sintering glass-ceramic. MATERIALS AND METHODS: A total of 27 different restorations were cemented in 21 patients. FDPs were examined with regard to biological and technical complications/failures. Additionally, clinical quality was assessed based on (i) the California Dental Association (CDA) criteria, (ii) the patient's viewpoint according to Hickel, and (iii) periodontal parameters...
March 8, 2018: Clinical Oral Investigations
Jobin Varghese, Tuomo Siponkoski, Maciej Sobocinski, Timo Vahera, Heli Jantunen
This paper reports the first ultralow sintering temperature (450 oC) co-fired multifunctional ceramic substrate based on a commercial lead zirconium titanate (PZ29)-glass composite and fabricated by tape casting, isostatic lamination, and sintering. This substrate was prepared from a novel tape casting slurry composition suitable for co-firing at this low temperature with commercial Ag electrodes at 450 oC. The green cast tape and sintered substrate showed a surface roughness of 146 nm and 355 nm, respectively, suitable for device level fabrication by post-processing...
March 7, 2018: ACS Applied Materials & Interfaces
Christopher Lund, Peter Guevara
Currently, there is no consensus on whether crowns fabricated via computer-aided design/computer-aided manufacturing (CAD/CAM) need to be replaced following an endodontic procedure. The aim of this in vitro study was to evaluate the effect of endodontic access preparation and repair on the failure load of lithium disilicate and resin nanoceramic crowns. The hypothesis was that there would be no difference in the failure load between the intact and repaired crowns. Eighty identical mandibular CAD/CAM crowns (40 lithium disilicate glass ceramic [IPS e...
March 2018: General Dentistry
Pablo Serrano-Castañeda, Jose Juan Escobar-Chavez, Isabel Marlen Rodriguez-Cruz, Luz Maria Melgoza, Jessica Martinez-Hernandez
The microneedles technology has found applications in many health-related fields. For example, their application in drugs and vaccines delivery as well, as the determination of biomarkers, has been reported. They also have a place in the dermatology and cosmetic areas such as the treatment of wounds from burns, scars, acne, depigmentation, and alopecia will be shown. Microneedles are used in therapeutic applications and are manufactured using materials such as metal (steel, titanium, nickel), polymer (oly-glycolic acid (PGA), poly-lactide-co-glycolide acid (PLGA), poly-L-lactic acid (PLA), chitosan), glass, silicon, ceramic, carbohydrates (trehalose, sucrose, mannitol)...
2018: Journal of Pharmacy & Pharmaceutical Sciences: a Publication of the Canadian Society for Pharmaceutical Sciences
Wenhao Li, Jingming Liu, Zhenting Zhang
Marginal gap (MG) was the most important factor to evaluate the success of crowns. The study was to assess the MG of lithium disilicate glass ceramic crowns with spectral domain optical coherence tomography (OCT) and stereomicroscopy in vitro, and to provide evidence to measure the MG with OCT. Consistency was observed between OCT and stereomicroscopy to measure the MG after cementation. There was no significant difference between the MG of lithium disilicate glass ceramic crowns using OCT and stereomicroscopy (OCT 59...
March 2018: Journal of Biomedical Optics
Soram Oh, Su-Mi Shin, Hyun-Jung Kim, Janghyun Paek, Sung-Joon Kim, Tai Hyun Yoon, Sun-Young Kim
The purpose of this study was to assess the influence of the types and thicknesses of glass ceramic plates on light transmittance and compare the degrees of conversion (DC) of resin cement under the ceramic materials. Three ceramic plates with thicknesses of 0.5, 1.0, 2.0, and 4.0 mm were fabricated from each of five commercial ceramic blocks in shade A2: high-translucency and low-translucency IPS Empress CAD (Emp_HT and Emp_LT); high-translucency and low-translucency IPS e.max CAD (Emx_HT and Emx_LT); and Vita Mark II (Vita)...
March 2, 2018: International Journal of Oral Science
Hamada Elasyed, Acacio Rincon Romero, Giulia Molino, Chiara Vitale Brovarone, Enrico Bernardo
Highly porous bioactive glass-ceramic scaffolds were effectively fabricated by an inorganic gel casting technique, based on alkali activation and gelification, followed by viscous flow sintering. Glass powders, already known to yield a bioactive sintered glass-ceramic (CEL2) were dispersed in an alkaline solution, with partial dissolution of glass powders. The obtained glass suspensions underwent progressive hardening, by curing at low temperature (40 °C), owing to the formation of a C-S-H (calcium silicate hydrate) gel...
February 27, 2018: Materials
Kristina E Goryainova, Egor S Morokov, Marina V Retinskaja, Fedor S Rusanov, Samvel V Apresyan, Igor Yu Lebedenko
Aim: The aim of the present work was to compare the elastic properties and internal structure of 4 different CAD/CAM chairside materials, by the method of Scanning Impulse Acoustic Microscopy (SIAM). Methods: Four chairside CAD/CAM materials with different structures from hybrid ceramic (VITA Enamic, VITA Zahnfabrik), feldspatic ceramic (VITABlocs Mark II, VITA Zahnfabrik), leucite glass-ceramic (IPS Empress CAD, Ivoclar Vivadent) and PMMA (Telio CAD, Ivoclar Vivadent) were examined by Scanning Impulse Acoustic Microscope (SIAM)...
2018: Open Dentistry Journal
Hiroki Takata, Futoshi Komine, Junichi Honda, Markus B Blatz, Hideo Matsumura
OBJECTIVES: The purpose of this in vitro study was to evaluate fracture loads of implant-supported zirconia-based prostheses fabricated with different veneer materials (resin-based material and lithium disilicate ceramics). MATERIAL AND METHODS: Forty-four zirconia-based molar prostheses were fabricated on dental implants and divided into four groups (n = 11): zirconia-based prostheses veneered with feldspathic porcelain (ZVF), zirconia-based prostheses bonded with the lithium disilicate glass-ceramic veneer (ZBD), zirconia-based prostheses veneered with indirect composite resin (ZVC), and zirconia-based prostheses bonded with composite materials fabricated from a CAD/CAM resin block (ZBC)...
February 27, 2018: Clinical Oral Implants Research
Zhenzhen Zhang, Jiawen Guo, Yali Sun, Beimin Tian, Xiaojuan Zheng, Ming Zhou, Lin He, Shaofeng Zhang
OBJECTIVES: The purpose of this study is to improve wear resistance and mechanical properties of lithium disilicate glass-ceramics by refining their crystal sizes. METHODS: After lithium disilicate glass-ceramics (LD) were melted to form precursory glass blocks, bar (N = 40, n = 10) and plate (N = 32, n = 8) specimens were prepared. According to the differential scanning calorimetry (DSC) of precursory glass, specimens G1-G4 were designed to form lithium disilicate glass-ceramics with different crystal sizes using a two-step thermal treatment...
February 20, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Sven Rinke, Anne-Kathrin Pabel, Xenia Schulz, Matthias Rödiger, Gerhard Schmalz, Dirk Ziebolz
OBJECTIVES: Retrospective evaluation of extended anterior glass-ceramic veneers 7 years after placement in a private practice. MATERIALS AND METHODS: A total of 31 patients (20 females/11 males) underwent restoration with adhesively luted extended veneers that were fabricated using heat-pressed glass-ceramic (Cergo, Dentsply Sirona). A single dentist restored 101 teeth (maxilla, n = 65; mandible, n = 36). Adhesive cementation was performed using an etch-and-rinse adhesive (OptibondFL, Kerr Corporation), and two different dual-curing composite cements (Variolink, Ivoclar Vivadent/Calibra, Dentsply Sirona)...
February 24, 2018: Journal of Esthetic and Restorative Dentistry
Paolo Baldissara, Vinícius Felipe Wandscher, Ana Maria Estivalete Marchionatti, Candida Parisi, Carlo Monaco, Leonardo Ciocca
STATEMENT OF PROBLEM: Although several monolithic zirconia ceramics have recently been introduced, the need for improved optical properties remains. The newest cubic-zirconia has been claimed to have optimal translucency characteristics for esthetic restorations. PURPOSE: This in vitro study evaluated the optical properties of novel cubic ultratranslucent (UT) and supertranslucent (ST) zirconia by comparing them with lithium disilicate (L-DIS) glass-ceramic for the manufacture of monolithic computer-aided design and computer-aided manufacturing (CAD-CAM) molar crowns...
February 21, 2018: Journal of Prosthetic Dentistry
Subhabrata Ghosh, Shivakiran Bhaktha B N
Eu-doped 70 SiO<sub>2</sub> - 23 HfO<sub>2</sub> - 7 ZnO (mol%) glass- ceramic waveguides have been fabricated by sol-gel method as a function of heat-treatment temperatures for on-chip blue-light emitting source applications. Structural evolution of spherical ZnO and spherical as well as rod-like HfO<sub>2</sub> nanocrystalline structures have been observed with heat-treatments at different temperatures. Initially, in the as-prepared samples at 900 °C, both, Eu<sup>2+</sup> as well as Eu<sup>3+</sup> ions are found to be present in the ternary matrix...
February 23, 2018: Nanotechnology
Yibo Zhang, Rujun Chen, Ting Liu, Bingqing Xu, Xue Zhang, Liangliang Li, Yuanhua Lin, Ce-Wen Nan, Yang Shen
By using highly Li-ion conductive 78Li2S-22P2S5 glass-ceramic (7822gc) as both electrolyte and active material in the composite cathode obtained via ball-milling the 7822gc with multiple carbons, a kind of monolithic all-solid-state batteries were prepared with lithium-indium foil as the anode. Such 7822gc-based monolithic batteries present stable discharge capacity of 480.3 mAh.g-1 at 0.176 after 60 cycles, which is three times of the previous work with the highest capacity so far among all attempts of using sulfide electrolytes as the active materials...
February 23, 2018: ACS Applied Materials & Interfaces
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