Lithium disilicate
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| IUPAC name
Lithium disilicate
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| Identifiers | |
3D model (JSmol)
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| ECHA InfoCard | 100.060.291 |
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PubChem CID
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| Properties | |
| Li2O5Si2 | |
| Molar mass | 150.04 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Lithium disilicate (Li2Si2O52-) is a chemical compound that is a glass ceramic. They are widely used as dental ceramics due to their strength, machinability, and translucency.
Use
Lithium disilicate has found applications in dentistry as a material for crowns in the form of Li2Si2O5. Lithium disilicate has an unusual microstructure that consists of many randomly oriented small and interlocking plate-like needle-like crystals. This structure causes cracks to be deflected, blunted, and/or to branch, which prevents cracks from growing.[2] Lithium disilicate has a biaxial flexible strength in the range of 360 MPa to 400 MPa; in comparison, for metal ceramics this is around 80 to 100 MPa, for veneered zirconia it's approximately 100 MPa, and for leucite glass ceramic it's approximately 150 to 160 MPa. It has high hardness (5.92 +/- 0.18 GPa) and fracture toughness (3.3 +/- 0.14 MPa m1/2). In addition, it can be made to have an appearance that very closely resembles that of natural human teeth.
References
- ^ Ivoclar Vivadent AG (8 November 2012). "Safety data sheet" (PDF). Retrieved 2 March 2020.
- ^ Shenoy A, Shenoy N (2010). "Dental ceramics: An update". J Conserv Dent. 13 (4): 195–203. doi:10.4103/0972-0707.73379. PMC 3010023. PMID 21217946.
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