Glass ceramic restoration has been popular in
restorative dentistry since the early 1990s. This
is waxed, invested, and pressed in a manner
somewhat similar to that for gold casting
restoration. Marginal adaptation seems to be
better with heat pressing than with the highstrength
alumina core restoration. Most heatpressed
materials contain leucite or lithium
disilicate as a major reinforcing crystalline phase,
dispersed in a glassy matrix. Two finishing
techniques can be used: a characterization
technique and a layering technique, involving
the application of a veneering porcelain. The
indications for higher-strength pressable dental
ceramic restoration include crowns and anterior
three-unit fixed dental prostheses.
