Lithium Disilicate
Pronunciation: LITH-ee-um dy-SIL-ih-kayt
A high-strength glass-ceramic material containing lithium disilicate crystals, widely used for aesthetic all-ceramic crowns, veneers, and inlays.
Full Definition
Lithium disilicate glass-ceramics (e.g., IPS e.max) consist of a glassy matrix reinforced by interlocking lithium disilicate (Li₂Si₂O₅) crystals constituting approximately 70% by volume, conferring flexural strengths of 360–400 MPa. The material is processed either by pressing (heat-pressing technique) or by CAD/CAM milling of partially crystallised blocks followed by a final crystallisation firing. Its translucency and fluorescence mimic natural dentition closely, making it the material of choice for anterior and premolar all-ceramic restorations. Editors must hyphenate 'lithium disilicate' only when used as a compound modifier and should not confuse it with leucite-reinforced ceramics.
Usage
Usage note: Do not capitalise 'lithium disilicate' unless it begins a sentence or forms part of a proprietary product name. Distinguish clearly from leucite-reinforced ceramics in research contexts.
In Context
- "The patient received a lithium disilicate crown on the upper right central incisor for optimum aesthetic outcomes." — Clinical case report
- "Lithium disilicate specimens exhibited significantly higher fracture toughness than leucite-reinforced controls." — Comparative materials science study