Effect of Post-Processing Heat Treatment on Micro-Contact Damage of Zirconia-Reinforced Lithium Silicate Dental Materials

Zirconia-reinforced lithium silicate (ZLS) is utilized as a material for prosthetic tooth crowns, offering enhanced strength compared to other dental glass-ceramics. In this study, we investigate a commercial ZLS material, provided in a fully crystallized form. We examine the effects of an optional...

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Published inMaterials Vol. 17; no. 9; p. 1961
Main Authors Pérez, José A, Rodríguez-Rojas, Fernando, Borrero-López, Óscar, Sánchez-González, Estíbaliz
Format Journal Article
LanguageEnglish
Published Switzerland MDPI AG 01.05.2024
Subjects
Aesthetics
Ceramics
Chipping
Contact
contact damage
Crack initiation
Crystallization
Crystals
Damage
Dental materials
Dentistry
fracture
Fracture mechanics
Fracture toughness
Glass ceramics
Hardness
Hardness tests
Heat treating
Heat treatment
Implants, Artificial
Investigations
Lithium
lithium silicate
Load
Manufacturers
Mechanical properties
Mechanics
Microstructure
Modulus of elasticity
Prostheses
Prosthesis
Scanning electron microscopy
Silicates
Zirconium dioxide
Zirconium oxide
United States > US
Japan
microstructure
contact damage
lithium silicate
dental materials
fracture
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Summary:Zirconia-reinforced lithium silicate (ZLS) is utilized as a material for prosthetic tooth crowns, offering enhanced strength compared to other dental glass-ceramics. In this study, we investigate a commercial ZLS material, provided in a fully crystallized form. We examine the effects of an optional post-processing heat treatment on micro-contact damage using controlled indentation tests simulating the primary modes of contact during chewing: axial and sliding. Our findings indicate that the heat treatment does not affect mechanical properties such as the elastic modulus, hardness and indentation fracture toughness. However, it does enhance the resistance to contact damage by fracture and chipping in both axial and sliding modes, as well as the resistance to crack initiation measured from sliding tests. This improvement is attributed to the refinement of the flaw population achieved through the heat treatment. The results are analysed using principles of contact and fracture mechanics theory, discussing their significance in prosthetic dentistry.
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ISSN:1996-1944
1996-1944
DOI:10.3390/ma17091961