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

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.

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Effect of increasing the Al2O3 content on the phase formation and mechanical properties of lithium disilicate glass-ceramics

Materials Research Express ◽

10.1088/2053-1591/abffa1 ◽

2021 ◽

Vol 8 (5) ◽

pp. 055202

Author(s):

Wilaiwan Leenakul ◽

Arnon Kraipok

Keyword(s):

Mechanical Properties ◽

Phase Formation ◽

Glass Ceramics ◽

Lithium Disilicate ◽

Al2o3 Content

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Studies of crystal phase formations in high-strength lithium disilicate glass–ceramics

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2006.06.039 ◽

2006 ◽

Vol 352 (38-39) ◽

pp. 4041-4050 ◽

Cited By ~ 115

Author(s):

W. Höland ◽

E. Apel ◽

Ch. van ‘t Hoen ◽

V. Rheinberger

Keyword(s):

Glass Ceramics ◽

High Strength ◽

Lithium Disilicate ◽

Crystal Phase

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Effect of PEG-based binder concentration on the mechanical properties of lithium disilicate glass-ceramics prepared by low-pressure injection moulding

Processing and Application of Ceramics ◽

10.2298/pac2103238k ◽

2021 ◽

Vol 15 (3) ◽

pp. 238-245

Author(s):

Arnon Kraipok ◽

Pratthana Intawin ◽

Manlika Kamnoy ◽

Suchittra Inthong ◽

Wilaiwan Leenakul ◽

...

Keyword(s):

Mechanical Properties ◽

Injection Moulding ◽

Glass Powder ◽

Acetic Acid Solution ◽

Glass Ceramics ◽

Lithium Disilicate ◽

Sintered Sample ◽

Low Pressure ◽

Bending Test ◽

Pressure Injection

Lithium disilicate (LD) glass-ceramics are extensively employed in restorative dentistry because their superior aesthetic properties and hardness are similar to natural teeth. The aim of this work is to investigate the mechanical properties and chemical solubility of lithium disilicate glass-ceramics prepared by the low-pressure injection moulding using the PEG-based binder. The glass-to-binder ratio was varied as 60:40, 55:45, 50:50 and 45:55 vol.%. The sintering conditions of 800?C with 2 h dwell time were selected according to thermal analysis. Phase formation, microstructure and mechanical properties of the prepared samples were characterized by XRD, SEM, microhardness and three-point bending test, respectively. Besides, the chemical solubility of the system was investigated by the immersion test in acetic acid solution. XRD analyses of the sintered sample confirmed the presence of only one prominent crystalline phase of LD. SEM result showed that the porosity increased with decreasing glass powder content. The mechanical properties of the LD glass-ceramic samples tended to decrease when the proportion of the glass powder decreased, while the chemical solubility tended to increase. The mechanical properties of the glass-ceramics, i.e. the highest density value, Vickers hardness and flexural strength were 2.55 g/cm3, 6.80GPa, and 176MPa, respectively. These results could be useful in developing these LD glass-ceramics for their optimal use in dental applications.

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Investigation of Mechanical Properties of Nano Sized Clay/LDH Particle as Hybrid Nano Composite Material

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.766-767.355 ◽

2015 ◽

Vol 766-767 ◽

pp. 355-361

Author(s):

S. Sivasaravanan ◽

V.K. Bupesh Raja ◽

S. Prabhu ◽

S. Dineshkumar ◽

Gokulaprasad

Keyword(s):

Composite Material ◽

Testing Machine ◽

Weight Ratio ◽

High Strength ◽

Sem Analysis ◽

Bending Test ◽

Flexural Property ◽

Weight Percentage ◽

Three Point Bending ◽

Sonication Technique

Usage of Hybrid nanocomposite materials provides a greater opportunity to replace the conventional materials due to their properties such as light weight and high strength to based on weight ratio. In this synergitic study, nanosized clay particle and layered double hydroxide particles are used. nanoclay and LDH particles were mixed on the bases of weight percentage (1wt% to 5wt%) by ultra sonication technique. The composite material was fabricated by one of the most common method known as hand lay-up technique. The composite materials was prepared in the form of plate with 4mm of thickness.The characterization of tensile and flexural property of the nanoclay, LDH and combination of both was analysis by tensile test using universal testing machine and three point bending test respectively. The tensile and three point bending test specimens were cut to size as per ASTM standard.The morphology of composite was studied using SEM analysis.

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