What is lithium disilicate made of?

The raw materials are melted together and then processed through a two-stage heat-press or CAD/CAM milling workflow. During the first stage, a lithium metasilicate intermediate is formed, which is machinable but weak. The second firing converts it to the final lithium disilicate phase, locking in the interlocking crystal microstructure that delivers both strength and translucency. That two-stage chemistry is what makes the material compatible with either pressed fabrication or milled-then-crystallized workflows.

For prosthodontists and restorative dentists, the composition matters clinically because the crystal density directly controls light transmission. Higher lithium disilicate crystal volume produces a more opaque result; lower density yields greater translucency. Selecting the right ingot or block shade and opacity at prescription time, before the case reaches the lab, avoids remakes driven by shade mismatch at seating. At Dani Dental, anterior lithium disilicate cases include a shade consultation note from the technician on the case, not a generic recommendation from a sales rep.

Lithium disilicate also contains trace fluorapatite crystals in some formulations, which scatter light in a way that mimics natural enamel fluorescence. That optical behavior is why the material outperforms full-contour zirconia on anterior esthetic cases where shade matching is the primary clinical concern. Understanding the compositional difference helps clinicians prescribe the right ceramic category at the outset rather than discovering the mismatch at try-in.