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Dental composition comprising a water-soluble polymerizable compound of the following formula (1): wherein A is a linear or branched linker group represented by the following formula (3), wherein the nitrogen atom of at least two of the termini forms an amide bond with an X moiety; wherein R′ repres

Dental composition comprising a water-soluble polymerizable compound of the following formula (1): wherein A is a linear or branched linker group represented by the following formula (3), wherein the nitrogen atom of at least two of the termini forms an amide bond with an X moiety; wherein R′ represents a hydrogen atom or a substituted or unsubstituted aliphatic or cycloaliphatic hydrocarbon group, wherein each R may be the same or different L1, L2, and L3 which may be the same or different, independently represent a single bond, or a C2-20 straight-chain, branched or cyclic hydrocarbon group optionally containing from 1 to 6 heteroatoms selected from nitrogen and oxygen in the backbone of the hydrocarbon group, and optionally from 1 to 6 functional groups selected from carboxylic acid groups or a salt thereof, hydroxyl groups, thiol groups and amino groups, and in case a plurality of L1 and L2 are present, each of L1 and L2 may be the same or different; Q1 and Q2, which may be the same or different, independently represent a single bond or a linkage selected from an amide, a urethane, a urea and a thiourea linkage; k is an integer of at least 0, X are moieties containing a polymerizable double bond and forming an amide bond with a nitrogen atom of A, wherein each X may be the same or different and are represented by the following formula (2): wherein R1 and R2 are independent from each other and represent a hydrogen atom, a C1-6 alkyl group or a group —(CH2)m—COOM, wherein M represents a hydrogen atom or a metal atom, m is an integer of from 0 to 6, L is a bond or a C1-6 alkylene group; and n is an integer of at least 2; (ii) an initiator system; optionally a polyacidic polymer; optionally water and/or a water soluble solvent; and optionally a particulate filler.

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1. A dental composition comprising: (i) a water-soluble polymerizable compound of the following formula (1): AXn  (1) wherein A is a linear or branched linker group containing at least n nitrogen atoms, wherein the linker group has one or more carboxylic acid groups and is represented by the followi

1. A dental composition comprising: (i) a water-soluble polymerizable compound of the following formula (1): AXn  (1) wherein A is a linear or branched linker group containing at least n nitrogen atoms, wherein the linker group has one or more carboxylic acid groups and is represented by the following formula (3), wherein the nitrogen atom of at least two of the termini forms an amide bond with an X moiety; whereinR′ represents a hydrogen atom or a substituted or unsubstituted aliphatic or cycloaliphatic hydrocarbon group, wherein each R′ may be the same or different;L1, L2, and L3 which may be the same or different, independently represent a single bond, or a C2-20 straight-chain, branched or cyclic hydrocarbon group optionally containing from 1 to 6 heteroatoms selected from nitrogen and oxygen in the backbone of the hydrocarbon group, and optionally from 1 to 6 functional groups selected from carboxylic acid groups or a salt thereof, hydroxyl groups, thiol groups, and amino groups, and in case a plurality of L1 and L2 are present, each of L1 and L2 may be the same or different;Q1 and Q2, which may be the same or different, independently represent a single bond or a linkage selected from an amide, a urethane, a urea, and a thiourea linkage;k is an integer of at least 0,X are moieties containing a polymerizable double bond and forming an amide bond with a nitrogen atom of A, wherein each X may be the same or different and are represented by the following formula (2): whereinR1 and R2 are independent from each other and represent a hydrogen atom, a C1-6 alkyl group, or a group —(CH2)m—COOM, wherein M represents a hydrogen atom or a metal atom and m is an integer of from 0 to 6,L is a bond or a C1-6 alkylene group; andn is an integer of at least 2; and(ii) an initiator system. 2. The dental composition according to claim 1, further containing a polyacidic polymer, water, a water soluble solvent, and/or a particulate filler. 3. The dental composition according to claim 1, wherein k is at least 1. 4. The dental composition according to claim 1, wherein the water soluble polymerizable compound of formula (1) has an average molecular weight of from 300 to 10,000. 5. The dental composition according to claim 1 wherein Q1 or Q2 is a single bond and the other of Q1 or Q2 is selected from an amide, a urethane, a urea and a thiourea linkage, and k is at least 1. 6. The dental composition according to claim 2, wherein the water soluble polymerizable compound of formula (1) has an average molecular weight of from 300 to 10,000. 7. The dental composition according to claim 3wherein the water soluble polymerizable compound of formula (1) has an average molecular weight of from 300 to 10,000. 8. The dental composition according to claim 1, wherein the one or more carboxylic acid groups of the linker group comprises at least two carboxylic acid groups. 9. A dental composition comprising: (i) a water-soluble polymerizable compound of the following formula (1): AXn  (1) wherein A is a linear or branched linker group containing at least n nitrogen atoms, wherein the linker group has one or more carboxylic acid groups and is represented by the following formula (3), wherein the nitrogen atom of at least two of the termini forms an amide bond with an X moiety; whereinR′ represents a hydrogen atom or a substituted or unsubstituted aliphatic or cycloaliphatic hydrocarbon group, wherein each R′ may be the same or different;L1, L2, and L3 which may be the same or different, independently represent a single bond, or a C2-20 straight-chain, branched or cyclic hydrocarbon group optionally containing from 1 to 6 heteroatoms selected from nitrogen and oxygen in the backbone of the hydrocarbon group, and optionally from 1 to 6 functional groups selected from carboxylic acid groups or a salt thereof, hydroxyl groups, thiol groups, and amino groups, and in case a plurality of L1 and L2 are present, each of L1 and L2 may be the same or different;Q1 and Q2 represent an amide linkage;k is an integer of at least 1,X are moieties containing a polymerizable double bond and forming an amide bond with a nitrogen atom of A, wherein each X may be the same or different and are represented by the following formula (2): whereinR1 and R2 are independent from each other and represent a hydrogen atom, a C1-6 alkyl group, or a group —(CH2)m—COOM, wherein M represents a hydrogen atom or a metal atom and m is an integer of from 0 to 6,L is a bond or a C1-6 alkylene group; andn is an integer of at least 2; and(ii) an initiator system. 10. The dental composition according to claim 9, further containing a polyacidic polymer, water, a water soluble solvent, and/or a particulate filler. 11. The dental composition according to claim 10, wherein the water soluble polymerizable compound of formula (1) has an average molecular weight of from 300 to 10,000. 12. The dental composition according to claim 9, wherein the water soluble polymerizable compound of formula (1) has an average molecular weight of from 300 to 10,000. 13. The dental composition according to claim 9, wherein the one or more carboxylic acid groups of the linker group comprises at least two carboxylic acid groups.