Influence of the background color and thickness of zirconia reinforced glass ceramics on the optical properties compared to lithium disilicate glass ceramics

2019 ◽  
Vol 65 (4) ◽  
pp. 3607-3615
Author(s):  
Yasser Lotfy Abdelnaby ◽  
Maha Taymor ◽  
Zyad Rabie
Keyword(s):  
Optical Properties ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Background Color

scholarly journals Effect of Thermocycling, Surface Treatments and Microstructure on the Optical Properties and Roughness of CAD-CAM and Heat-Pressed Glass Ceramics

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 381 ◽  
Author(s):  
Roxana-Diana Vasiliu ◽  
Sorin Daniel Porojan ◽  
Mihaela Ionela Bîrdeanu ◽  
Liliana Porojan
Keyword(s):  
Surface Roughness ◽  
Optical Properties ◽  
Glass Ceramic ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Ceramic Materials ◽  
Surface Treatments ◽  
Lithium Silicate ◽  
Before And After ◽  
Cad Cam

Dental ceramic restorations are widely spread nowadays due to their aesthetics and biocompatibility. In time, the colour and structure of these ceramic materials can be altered by aging processes. How does artificial aging affect the optical and surface roughness of ceramics? This study aims to assess the effect of thermocycling, surface treatments and microstructure upon translucency, opalescence and surface roughness on CAD-CAM and heat-pressed glass-ceramic. Forty-eight samples (1.5 mm thickness) were fabricated from six types of A2 MT ceramic: heat-pressed and milled glass-ceramic (feldspathic, lithium disilicate and zirconia reinforced lithium silicate). The samples were obtained respecting the manufacturer’s instructions. The resulted surfaces (n = 96) were half glazed and half polished. The samples were subjected to thermocycling (10,000 cycles) and roughness values (Ra and Rz), colour coordinates (L*, a*, b*) and microstructural analyses were assessed before and after thermocycling. Translucency (TP) and opalescence (OP) were calculated. Values were statistically analysed using ANOVA test (one way). TP and OP values were significantly different between heat-pressed and milled ceramics before and also after thermocycling (p < 0.001). Surface treatments (glazing and polishing) had a significant effect on TP and OP and surface roughness (p < 0.05). The heat-pressed and milled zirconia reinforced lithium silicate glass-ceramic experienced a loss in TP and OP. Ra and Rz increased for the glazed samples, TP and OP decreased for all the samples after thermocycling. Microstructural analyse revealed that glazed surfaces were more affected by the thermocycling and especially for the zirconia reinforced lithium silicate ceramic. Optical properties and surface roughness of the chosen ceramic materials were affected by thermocycling, surface treatments and microstructural differences. The least affected of the ceramics was the lithium disilicate ceramic heat-pressed polished and glazed.

Microstructure, mechanical, EPR and optical properties of lithium disilicate glasses and glass–ceramics doped with Mn2+ ions

2012 ◽  
Vol 512 (1) ◽  
pp. 105-114 ◽  
Author(s):  
A.R. Molla ◽  
R.P.S. Chakradhar ◽  
C.R. Kesavulu ◽  
J.L. Rao ◽  
S.K. Biswas
Keyword(s):  
Optical Properties ◽  
Glass Ceramics ◽  
Lithium Disilicate

Optical Properties of Transparent Glass-Ceramics Containing Er3+-Doped Sodium Lutetium Fluoride Nanocrystals

2015 ◽  
Vol 7 (1) ◽  
pp. 27-40 ◽  
Author(s):  
Maria J. Pascual ◽  
Cristian Garrido ◽  
Alicia Durán ◽  
Adrián Miguel ◽  
Laura Pascual ◽  
...  
Keyword(s):  
Optical Properties ◽  
Glass Ceramics ◽  
Transparent Glass

Effect of surface treatments on titanium alloy bonding to lithium disilicate glass-ceramics

2016 ◽  
Vol 116 (5) ◽  
pp. 797-802 ◽  
Author(s):  
Nuno Guilherme ◽  
Chandur Wadhwani ◽  
Cheng Zheng ◽  
Kwok-Hung Chung
Keyword(s):  
Titanium Alloy ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Surface Treatments ◽  
Effect Of Surface

Crystal Phase Formation and Mechanical Properties of Lithium Disilicate Glass-Ceramics for Dental Restoration

2010 ◽  
Vol 177 ◽  
pp. 447-450 ◽  
Author(s):  
Xin Zhang ◽  
Yi Wen Hu ◽  
Yin Wu ◽  
Wen Jie Si
Keyword(s):  
Mechanical Properties ◽  
Phase Formation ◽  
Glass Ceramics ◽  
High Strength ◽  
Lithium Disilicate ◽  
Sem Analysis ◽  
Dental Restoration ◽  
Bending Test ◽  
Crystal Phase ◽  
High Temperature Xrd

The purpose of this study was to evaluate the crystal phase formation behavior and its influence on the mechanical properties of LiO2-SiO2-P2O5 glass-ceramics system. High temperature XRD was used to analyze the crystal phase formation in situ. The crystalline phases in the material both before and after heat-treatment were also analyzed. The flexural strength was measured by three-point bending test according to ISO 6872:2008(E). The SEM analysis showed that the high strength of the glass-ceramics is attributed to the continuous interlocking microstructure with fine lithium disilicate crystallines.

Er-doped and Er, Yb co-doped oxyfluoride glasses and glass–ceramics, structural and optical properties

2011 ◽  
Vol 33 (11) ◽  
pp. 1630-1637 ◽  
Author(s):  
Radosław Lisiecki ◽  
Elżbieta Augustyn ◽  
Witold Ryba-Romanowski ◽  
Michał Żelechower
Keyword(s):  
Optical Properties ◽  
Glass Ceramics ◽  
Structural And Optical Properties ◽  
Oxyfluoride Glasses ◽  
Er Doped ◽  
Co Doped

Optical properties of divalent samarium-doped fluorochlorozirconate glasses and glass ceramics

2009 ◽  
Vol 31 (10) ◽  
pp. 1459-1466 ◽  
Author(s):  
A. Edgar ◽  
C.R. Varoy ◽  
C. Koughia ◽  
D. Tonchev ◽  
G. Belev ◽  
...  
Keyword(s):  
Optical Properties ◽  
Glass Ceramics

The effect of spark plasma sintering on lithium disilicate glass-ceramics

2015 ◽  
Vol 31 (10) ◽  
pp. e226-e235 ◽  
Author(s):  
Fatima Al Mansour ◽  
Natalia Karpukhina ◽  
Salvatore Grasso ◽  
Rory M. Wilson ◽  
Mike J. Reece ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Glass Ceramics ◽  
Lithium Disilicate ◽  
Plasma Sintering ◽  
Spark Plasma
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