Preparation and Characterization of LAS Glass Based Materials for Dental Applications

2016 ◽  
Vol 702 ◽  
pp. 28-31 ◽  
Author(s):  
Silvia Barbi ◽  
Monia Montorsi ◽  
Consuelo Mugoni ◽  
Cristina Siligardi
Keyword(s):  
Flexural Strength ◽  
Glass Ceramic ◽  
Structural Changes ◽  
Industrial Process ◽  
Ceramic Materials ◽  
Ceramic Support ◽  
Natural Teeth ◽  
Ceramic Glass ◽  
Glass Interface ◽  
Dental Applications

Glass ceramic materials are widely used in dental application because of their strong similarity with natural teeth. In this study LAS glass ceramic/glass materials were prepared by glazing processing and characterized in terms of mechanical flexural strength. The selected glass ceramic support derives from an industrial process. Different glasses were applied to the glass ceramic support in order to investigate firstly their effect on the glass ceramic/glass interface and secondly how these structural changes are correlated to the flexural strength property. Different thermal cycles were applied to the glass ceramic in order to promote the increasing of mechanical flexural strength. Preliminary results clearly points out that the application of a glass on the support leads to the decrease of the flexural strength if compared to the materials without any coating applied.

scholarly journals Reddish-Orange Luminescence from BaF2:Eu3+ Fluoride Nanocrystals Dispersed in Sol-Gel Materials

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3735 ◽  
Author(s):  
Natalia Pawlik ◽  
Barbara Szpikowska-Sroka ◽  
Joanna Pisarska ◽  
Tomasz Goryczka ◽  
Wojciech A. Pisarski
Keyword(s):  
Glass Ceramic ◽  
Structural Changes ◽  
Sol Gel ◽  
Ceramic Materials ◽  
Xrd Analysis ◽  
Luminescence Spectra ◽  
Silica Network ◽  
Scanning Calorimetry ◽  
Glass Ceramic Materials ◽  
Reddish Orange

Nanocrystalline transparent BaF2:Eu3+ glass-ceramic materials emitting reddish-orange light were fabricated using a low-temperature sol-gel method. Several experimental techniques were used to verify structural transformation from precursor xerogels to sol-gel glass-ceramic materials containing fluoride nanocrystals. Thermal degradation of xerogels was analyzed by thermogravimetric analysis (TG) and differential scanning calorimetry method (DSC). The presence of BaF2 nanocrystals dispersed in sol-gel materials was confirmed by the X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM). In order to detect structural changes in silica network during annealing process, the infrared spectroscopy (IR-ATR) was carried out. In particular, luminescence spectra of Eu3+ and their decays were examined in detail. Some spectroscopic parameters of Eu3+ ions in glass-ceramics containing BaF2 nanocrystals were determined and compared to the values obtained for precursor xerogels. It was observed, that the intensities of two main red and orange emission bands corresponding to the 5D0→7F2 electric-dipole transition (ED) and the 5D0→7F1 magnetic-dipole (MD) transition are changed significantly during transformation from xerogels to nanocrystalline BaF2:Eu3+ glass-ceramic materials. The luminescence decay analysis clearly indicates that the measured lifetime 5D0 (Eu3+) considerably enhanced in nanocrystalline BaF2:Eu3+ glass-ceramic materials compared to precursor xerogels. The evident changes in luminescence spectra and their decays suggest the successful migration of Eu3+ ions from amorphous silica network to low-phonon BaF2 nanocrystals.

Flexural strength of an infused ceramic, glass ceramic, and feldspathic porcelain

1995 ◽  
Vol 73 (5) ◽  
pp. 411-418 ◽  
Author(s):  
Russell A. Giordano ◽  
Lionel Pelletier ◽  
Stephen Campbell ◽  
Richard Pober
Keyword(s):  
Flexural Strength ◽  
Glass Ceramic ◽  
Ceramic Glass ◽  
Feldspathic Porcelain

The effect of casting conditions on the biaxial flexural strength of glass–ceramic materials

1998 ◽  
Vol 14 (6) ◽  
pp. 412-416 ◽  
Author(s):  
Anthony Johnson ◽  
Mohammed Y Shareef ◽  
Jennifer M Walsh ◽  
Paul V Hatton ◽  
Richard van Noort ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Glass Ceramic ◽  
Ceramic Materials ◽  
Glass Ceramic Materials ◽  
Biaxial Flexural Strength

Clinical Success of IPS Empress II Inlays/Onlays

2011 ◽  
Vol 493-494 ◽  
pp. 620-625
Author(s):  
Funda Yanıkoğlu ◽  
Gürol Özyöney ◽  
Nuran Özyöney ◽  
Dilek Tağtekin ◽  
Hesna Öveçoğlu ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Clinical Performance ◽  
Clinical Success ◽  
Ceramic Materials ◽  
Dental Restorations ◽  
Dental Applications ◽  
Ceramic Restorations

For the dental restorations, ceramic materials have increasing popularities because of their biocompatibility and superior esthetics. IPS Empress which is leucite-reinforced glass ceramic is one of the most popular ceramics. IPS Empress II was developed in following years which is stronger than IPS Empress. In the dental applications some problems occur about ceramic restorations. Hence,this study was performed to examine the six-year clinical performance of IPS Empress II ceramic onlay and inlay restorations.

scholarly journals Sinter recrystalization and properties evaluation of glass-ceramic from waste glass bottle and magnesite for extended application

10.30544/223 ◽  
2016 ◽  
Vol 22 (4) ◽  
pp. 285-302
Author(s):  
As'mau Ibrahim Gebi ◽  
Shehu Aliyu Yaro ◽  
Malik Abdulwahab ◽  
Mamuda Rayyan Dodo
Keyword(s):  
Particle Size ◽  
Flexural Strength ◽  
Glass Ceramic ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Glass Frit ◽  
X Ray Diffraction ◽  
Glass Bottle ◽  
X Ray ◽  
Glass Ceramic Materials

In a bid to address environmental challenges associated with the management of waste Coca cola glass bottle, this study set out to develop glass ceramic materials using waste coca cola glass bottles and magnesite from Sakatsimta in Adamawa state. A reagent grade chrome (coloring agent) were used to modify the composition of the coca cola glass bottle;  X-ray fluorescence(XRF), X-ray diffraction (XRD) and Thermo gravimetric analysis (TGA) were used to characterize raw materials, four batches GC-1= Coca cola glass frit +1%Cr2O3, GC-2=97% Coca cola glass frit+ 2% magnesite+1%Cr2O3, GC-3=95% Coca cola glass frit+ 4%magnesite+1%Cr2O3, GC-4=93%Coca cola glass frit+ 6%magnesite+ 1%Cr2O3 were formulated and prepared. Thermal Gradient Analysis (TGA) results were used as a guide in selection of three temperatures (7000C, 7500C and 8000C) used for the study, three particle sizes -106+75, -75+53, -53µm and 2 hr sintering time were also used, the sinter crystallization route of glass ceramic production was adopted. The samples were characterized by X-ray diffraction (XRD) and Scanning Electron Microscope (SEM), the density, porosity, hardness and flexural strength of the resulting glass ceramics were also measured. The resulting glass ceramic materials composed mainly of wollastonite, diopside and anorthite phases depending on composition as indicated by XRD and SEM, the density of the samples increased with increasing sintering temperature and decreasing particle size. The porosity is minimal and it decreases with increasing sintering temperature and decreasing particle size. The obtained glass ceramic materials possess appreciable hardness and flexural strength with GC-3 and GC-4 having the best combination of both properties.

Basic Physics in Color-Coded EOS Metallization Failures (Differentiating between EOS and ESD)

1998 ◽  
Author(s):  
Leo G. Henry ◽  
J.H. Mazur
Keyword(s):  
Failure Analysis ◽  
Light Microscope ◽  
Structural Changes ◽  
Surface Oxide ◽  
Aluminum Surface ◽  
Surrounding Area ◽  
Die Surface ◽  
Basic Physics ◽  
Direct Contrast ◽  
Glass Interface

Abstract The task of differentiating precisely between EOS and ESD failures continues to be a challenging one for Failure Analysis Engineers. Electrical OverStress (EOS) failures on the die surface (burnt/fused metallization) of an IC can be characterized mainly by the discoloration at the site of the failures. This is in direct contrast to the lack of discoloration characteristic of ESD failures, which occur almost exclusively below the die surface (oxide and junction failures). To aid in this distinction, this paper attempts to present the underlying physics behind the discoloration produced in the EOS failures. For the EOS failures, the metal fuses due to the longer pulse widths (sec to msec), while for the ESD failures, the silicon melts because of the shorter pulse widths (< < 500 nsec) and higher energy. After EOS, the aluminum surface becomes dark and rough and the oxide in the surrounding area becomes deformed and distorted, resulting in the discoloration observed in the light microscope. This EOS discoloration could be due to one or more of the following: 1) morphological and structural changes at the metal/glass interface and the glass itself; 2) changes in the thickness and scattering behavior of the glass and metal in the failed areas.

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