The role of excess hydroxyl ions in the crystallization behaviour of an Al2O3-ZrO2-SiO2-Na2O glass-ceramic system

1988 ◽  
Vol 23 (10) ◽  
pp. 3544-3549 ◽  
Author(s):  
I. M. Low ◽  
R. McPherson
Keyword(s):  
Glass Ceramic ◽  
Crystallization Behaviour ◽  
Ceramic System

Impact of Silane-containing Universal Adhesive on the Biaxial Flexural Strength of a Resin Cement/Glass-ceramic System

2019 ◽  
Vol 44 (2) ◽  
pp. 200-209 ◽  
Author(s):  
F Murillo-Gómez ◽  
RB Wanderley ◽  
MF De Goes
Keyword(s):  
Flexural Strength ◽  
Glass Ceramic ◽  
Resin Cement ◽  
Weibull Analysis ◽  
Ceramic System ◽  
Universal Adhesive ◽  
Bonded Interface ◽  
Biaxial Flexural Strength ◽  
Digital Caliper ◽  
One Way Anova

SUMMARY The aim of this study was to determine whether using a silane-containing universal adhesive as a silane primer in glass-ceramic/resin cement systems affects biaxial flexural strength (BFS) and bonded interface integrity after loading. Glass-ceramic (IPS e.max CAD, Ivoclar/Vivadent, Schaan, Liechtenstein) disc-shaped specimens (6.5±0.1mm in diameter, 0.5±0.1mm thick) were etched with 5% hydrofluoric acid (HF) for 20 seconds and divided into four groups of 30 specimens, to be treated as follows: 1) One bottle silane primer (RCP); 2) Separate application of silane and adhesive (RCP+SB); 3) Silane-containing universal adhesive (SBU); 4) No treatment (C). After silanization, all specimens were resin cement– coated and polymerized for 40 seconds. Each specimen layer was measured, as well as each assembly's thickness, using a digital caliper and scanning electron microscope (SEM). Specimens were stored for 24 hours and submitted to a BFS test (1.27 mm/min). BFS values were calculated using the bilayer disc-specimen solution. Bonded interfaces were analyzed on fractured fragments using SEM. One-way ANOVA and Tukey tests (α=0.05) were applied, as well as the Weibull analysis. Factor “silane treatment” was statistically significant (p<0.0001). RCP+SB (372.2±29.4 MPa) and RCP (364.2±29.5 MPa) produced significantly higher BFS than did the C (320.7±36.3 MPa) or SBU (338.0±27.1 MPa) groups. No differences were found in the Weibull modulus (m: RCP: 10.1-17.3; RCP+SB: 10.1-17.0; SBU: 12.3-22.4; C: 7.4-12.9). Bonded interface analysis exhibited ceramic-cement separation (SBU, C) and voids within the resin cement layer (all groups). Neither the ceramic/cement system's BFS nor its bonded interface stability were improved by SBU after loading.

Spherulitic growth of apatite in a glass—ceramic system

1986 ◽  
Vol 5 (12) ◽  
pp. 1309-1312 ◽  
Author(s):  
P. R. Carpenter ◽  
M. Campbell ◽  
R. D. Rawlings ◽  
P. S. Rogers
Keyword(s):  
Glass Ceramic ◽  
Ceramic System ◽  
Spherulitic Growth

Key role of the expression of bone morphogenetic proteins in increasing the osteogenic activity of osteoblast-like cells exposed to shock waves and seeded on bioactive glass-ceramic scaffolds for bone tissue engineering

2014 ◽  
Vol 29 (5) ◽  
pp. 728-736 ◽  
Author(s):  
Giuliana Muzio ◽  
Germana Martinasso ◽  
Francesco Baino ◽  
Roberto Frairia ◽  
Chiara Vitale-Brovarone ◽  
...  
Keyword(s):  
Shock Wave ◽  
Alkaline Phosphatase ◽  
Shock Waves ◽  
Bioactive Glass ◽  
Bone Morphogenetic Protein ◽  
Bone Morphogenetic Proteins ◽  
Glass Ceramic ◽  
Osteogenic Activity ◽  
Morphogenetic Protein

In this work, the role of shock wave-induced increase of bone morphogenetic proteins in modulating the osteogenic properties of osteoblast-like cells seeded on a bioactive scaffold was investigated using gremlin as a bone morphogenetic protein antagonist. Bone-like glass-ceramic scaffolds, based on a silicate experimental bioactive glass developed at the Politecnico di Torino, were produced by the sponge replication method and used as porous substrates for cell culture. Human MG-63 cells, exposed to shock waves and seeded on the scaffolds, were treated with gremlin every two days and analysed after 20 days for the expression of osteoblast differentiation markers. Shock waves have been shown to induce osteogenic activity mediated by increased expression of alkaline phosphatase, osteocalcin, type I collagen, BMP-4 and BMP-7. Cells exposed to shock waves plus gremlin showed increased growth in comparison with cells treated with shock waves alone and, conversely, mRNA contents of alkaline phosphatase and osteocalcin were significantly lower. Therefore, the shock wave-mediated increased expression of bone morphogenetic protein in MG-63 cells seeded on the scaffolds is essential in improving osteogenic activity; blocking bone morphogenetic protein via gremlin completely prevents the increase of alkaline phosphatase and osteocalcin. The results confirmed that the combination of glass-ceramic scaffolds and shock waves exposure could be used to significantly improve osteogenesis opening new perspectives for bone regenerative medicine.

Mixed polyanion NaCo1−x (VO) x PO4 glass–ceramic cathode: role of ‘Co’ on structural behaviour and electrochemical performance

2017 ◽  
Vol 52 (9) ◽  
pp. 5038-5047 ◽  
Author(s):  
G. Suman ◽  
Ch. Srinivasa Rao ◽  
Prasanta Kumar Ojha ◽  
M. S. Surendra Babu ◽  
R. Balaji Rao
Keyword(s):  
Electrochemical Performance ◽  
Glass Ceramic ◽  
Structural Behaviour

A TEM Study of Crystal Growth in a Y-Si-AI-O-N Glass Ceramic System

2000 ◽  
Vol 325-326 ◽  
pp. 289-294 ◽  
Author(s):  
W.T. Young ◽  
L.K.L. Falk ◽  
H. Lemercier ◽  
Stuart Hampshire
Keyword(s):  
Crystal Growth ◽  
Glass Ceramic ◽  
Ceramic System

scholarly journals Properties of Li2O-ZnO-Al2O3-SiO2 glass-ceramic system prepared by spray pyrolysis

2009 ◽  
Vol 117 (1365) ◽  
pp. 717
Author(s):  
Jin Man HAN ◽  
Dae Soo JUNG ◽  
Jang Heui YI ◽  
Yun Chan KANG
Keyword(s):  
Spray Pyrolysis ◽  
Glass Ceramic ◽  
Ceramic System ◽  
Sio2 Glass
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