Patent ID: 7893130

Claim:
A dental composition photocurable by radiation with a wavelength greater than 390 nm, the 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); and (5) at least one photosensitizer (E) which is a thioxanthone salt substituted by at least one group G containing an ammonium function, the said photosensitizer (E), optionally in combination with at least one camphorquinone, phenanthrenequinone and/or substituted anthracene, has the formula: in which: R 22 and R 23 are identical or different and represent a hydrogen or an optionally substituted C 1 -C 10 alkyl radical; (Y − ) being an anionic entity, selected from the group consisting of: BF 4 − , PF 6 − ; SbF 6 − ; the anion (I) of formula [BX a R b ] − defined below, R f SO 3 − ; (R f SO 2 ) 3 C − or (R f SO 2 ) 2 N − , where R f is a linear or branched alkyl radical substituted by at least one halogen atom the said anion (I) of formula [BX a R b ] − being defined in the following manner: a and b are integers ranging from 0 to 3 for a and from 1 to 4 for b, with a+b=4, the symbols X represent: a halogen atom, with a=0 to 3, or an OH function, with a=0 to 2, the symbols R are identical or different and represent: a phenyl radical substituted by at least one electron-withdrawing group and/or by at least two halogen atoms, when the cationic entity is an onium of an element from groups 15 to 17, a phenyl radical substituted by at least one electron-withdrawing element or group, when the cationic entity is an organometallic complex of an element from groups 4 to 10, or an aryl radical containing at least two aromatic nuclei, substituted by at least one electron-withdrawing element or group, irrespective of the cationic entity.