Procedure for the preparation of a dental restoration, comprising (a) producing a melt of a starting glass containing the initial components SiO2, Li2O, K2O, Al2O3 and P2O5 as main components, (b) pouring the melt of the glass Starting in a mold to form a blank piece of starting glass and cooling the blank piece of glass to room temperature, (c) subjecting the blank piece of starting glass to a first heat treatment at a first temperature to providing a glass product containing cores suitable for the formation of lithium metasilicate crystals, or (b ') pouring the melt of the starting glass into a mold to form a blank piece of starting glass and cooling the piece glass blank up to a first temperature of 450 to 550 ° C, (c ') keep the blank glass blank at the first temperature for a period of 5 minutes to 50 minutes to provide a glass product containing cores suitable for the formation of lithium metasilicate crystals, (d) subjecting the glass product of step (c) or (c ') to a second heat treatment at a second temperature that is higher at the first temperature to obtain the lithium silicate blank with lithium metasilicate crystals as the main crystalline phase, and (e) conform the lithium silicate blank with lithium metasilicate as the main crystalline phase to a desired geometry by machining or hot pressing to form a formed lithium silicate product.Procedimiento para la preparación de una restauración dental, que comprende (a) producir una masa fundida de un vidrio de partida que contiene los componentes iniciales SiO2, Li2O, K2O, Al2O3 y P2O5 como componentes principales, (b) verter la masa fundida del vidrio de partida en un molde para formar una pieza en bruto de vidrio de partida y enfriar la pieza en bruto de vidrio hasta la temperatura ambiente, (c) someter la pieza en bruto de vidrio de partida a un primer tratamiento térmico a una primera temperatura para proporcionar un producto de vidrio que contiene unos núcleos adecuados para la formación de cristales de
