Stable cationically crosslinkable/polymerizable dental composition with a high filler content

A dental composition comprising:

• (1) at least one cationically reactive compound (A);
• (2) at least one dental filler (B);
• (3) optionally at least one dispersant (C) comprising at least one organic polymer or copolymer;
• (4) at least one cationic photoinitiator (D);
• (5) and optionally at least one photosensitizer (E),
• where said composition comprising at least one dental filler (B) having been treated via a process (I) comprising the following steps:
• a) mixing in a solvent medium the at least one dental filler (B) with at least one organosilicon coupling agent (F) of the formula:
• in which formula:
• R is a hydrogen or a linear or branched C1-C4 alkyl radical,
• R1 is a linear or branched alkyl radical or a phenyl radical,
• x is equal to 0, 1 or 2, and
• X is defined by one of the following formulae:
• where:
• E and D which are identical or different radicals chosen from linear or branched C12-C12 alkylene,
• z is equal to 0 or 1;
• n is equal to 0 or 1;
• p is equal to 0, 1, 2, 3, 4, 5 or 6;
• R2, R3, R4, R5, R6, R7 and R8 are radicals, which may be identical or different, representing a hydrogen or a linear or branched C1-C12 alkyl;
• b) evaporating the solvent to obtain an intermediate dental filler (B-1),
• c) heat treating the intermediate dental filler (B-1) to allow the coupling reaction between the intermediate dental filler (B-1) and the coupling agent (F) and thus obtain an intermediate dental filler (B-2),
• d) mixing the intermediate dental filler (B-2) in a solvent medium with at least one compound (G) comprising at least one oxirane, oxetane, alkenyl ether and/or carbonate function,
• e) evaporating the solvent to obtain an intermediate dental filler (B-3), and
• f) heat treating the intermediate dental filler (B-3) to allow the reaction between the intermediate dental filler (B-3) and the compound (G) and thus to obtain a treated dental filler (B-4).