The invention relates to dental compositions which can be used to produce dental prostheses and for dental restoration. The inventive compositions comprise: (1) a concentrated silica solution comprising colloidal amorphous silica particles in at least one continuous silicon phase, consisting of polymerisable and/or crosslinkable silicon polymer and/or oligomer； (2) at least one photosensitiser； and (3) a cationic initiator which is selected from among those comprising a cationic entity selected from onium salts having formula (1): [(R1)n-A-(R2)m]+
