Preformed dental composite crown, process of production and use thereof

A process of producing a preformed dental composite crown by milling the preformed dental composite crown out of a milling block, the process comprising the steps of

• providing a composite milling block,
• the chemical composition the composite milling block is made of comprising the following components:
• nano-filler(s) in an amount from 20 to 70 wt. %,
• resin matrix in an amount from 20 to 75 wt. %,
• wt. % with respect to the weight of the chemical composition,
• the resin matrix comprising urethane(meth)acrylate(s) and (meth)acrylate(s) not comprising a urethane moiety;
• milling the preformed dental composite crown out of the composite milling block,
• the shape of the preformed dental composite crown being characterized as follows:
• for molars and premolars having an occlusal top surface and depending buccal,
• mesial, distal and lingual, respectively palatinal side surfaces,
• for anterior teeth and incisors having a distal top surface and depending labial, mesial,
• distal and lingual, respectively palatinal side surfaces,
• the side surfaces being connected to each other and forming a crown cervix,
• the wall thickness of the crown at the crown cervix being lower than 0.6 mm;
• at least two of opposing depending side surfaces having a concave shape.