scholarly journals A Novel Approach to Develop Chalcogenide Glasses and Glass-Ceramics by Pulsed Current Electrical Sintering (PCES)

10.5772/32613 ◽  
2012 ◽  
Author(s):  
Gaelle Delaizir ◽  
Laurent Calvez
Keyword(s):  
Chalcogenide Glasses ◽  
Glass Ceramics ◽  
Pulsed Current ◽  
Novel Approach

Mössbauer investigation of tin-containing chalcogenide glasses and glass-ceramics

1981 ◽  
Vol 45 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Ji-Jian Cheng ◽  
J. Zarzycki ◽  
J.C. Jumas ◽  
M. Ribes
Keyword(s):  
Chalcogenide Glasses ◽  
Glass Ceramics

scholarly journals Effect of Thermo-Mechanical Aging and Repressing on Fracture Resistance of Lithium Disilicate Crowns

2021 ◽  
Vol 24 (3) ◽  
Author(s):  
Amr El-Etreby ◽  
Mahmoud Metwally ◽  
Gihan EL-Nagar
Keyword(s):  
Glass Ceramic ◽  
Fracture Resistance ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Mean Value ◽  
Resistance Testing ◽  
Novel Approach ◽  
Significant Difference ◽  
Keywords Fracture ◽  
Mechanical Aging

Objective: The recycling of heat pressed lithium disilicate glass-ceramic leftover material has been reported to be done by dental laboratories. The effect of this procedure on the fracture resistance of single crowns is unknown, especially when it is functioning inside the oral cavity with subsequent exposure to temperature changes and cycles of mastication. Material and Methods: A total of 28 lithium disilicate glass-ceramic crowns (IPS emax Press) were constructed and randomly assigned into two groups (n = 14); Group (P): Included crowns fabricated from new e.max ingots. Group (R): Included crowns fabricated from repressed e.max buttons. Specimens of each group were divided into two equal subgroups (n = 7) according to whether the aging of specimens will be performed or not before fracture resistance testing. Subgroup (N), samples were subjected to fracture resistance without thermo-mechanical aging, while subgroup (A), samples were subjected to thermo-cycling and cyclic loading before being subjected to fracture strength testing. Different methods; SEM, XRD, EDAX were used to characterize the properties of lithium disilicate glass-ceramics before and after repressing. Results: The highest statistically significant fracture resistance value was recorded for the subgroup (RN) repressed/non-aged, followed by the subgroup repressed/aged (RA), while the lowest statistically significant mean value was recorded for the subgroup pressed/aged (PA). There was no significant difference between pressed/non-aged (PN) and repressed/aged (RA) subgroups. Conclusion: Repressing of leftover buttons may increase the fracture resistance of IPS emax Press crowns. Thermo-mechanical aging may negatively affect the fracture resistance of IPS emax Press crowns, yet Repressing may decrease this effect. Clinical implications: This is a novel approach that targets a point of research that has not been investigated before. It elaborates how repressing may decrease the effect of aging and increase the fracture resistance of lithium disilicate crowns. Thus, recycling of lithium disilicate glass ceramics might decrease its failure and prolong their serviceability.   Keywords Fracture resistance; Heat pressed; Lithium disilicate; Recycling; Repressing; Thermo-mechanical aging.

Similar behaviors of sulfide and selenide-based chalcogenide glasses to form glass ceramics

2010 ◽  
Author(s):  
Laurent Calvez ◽  
Changgui Lin ◽  
Mathieu Rozé ◽  
Yannick Ledemi ◽  
Erwan Guillevic ◽  
...  
Keyword(s):  
Chalcogenide Glasses ◽  
Glass Ceramics

scholarly journals An innovative approach to develop highly performant chalcogenide glasses and glass-ceramics transparent in the infrared range

2011 ◽  
Vol 19 (23) ◽  
pp. 23513 ◽  
Author(s):  
Mathieu Hubert ◽  
Gaëlle Delaizir ◽  
Judith Monnier ◽  
Claude Godart ◽  
Hong-Li Ma ◽  
...  
Keyword(s):  
Chalcogenide Glasses ◽  
Glass Ceramics ◽  
Innovative Approach ◽  
Infrared Range
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