Dental composition

A diepoxide of the following formula (I) or a salt thereof:

• wherein
• R which may be the same or different when more than one R is present, represents a hydroxyl group, a C1-6 alkoxy group, a C1-6 alkyl group a di-C1-6-alkylamino group, or a C6-10 aryl group, or two R may be linked together and form with the carbon atoms to which they are bonded a 5- to 7-membered ring which may contain 1 or 2 heteroatoms selected from oxygen atoms and sulfur atoms;
• R1 and R2
• which may be the same or different when more than one of R1 and R2 is present, represent a hydrogen atom or a C1-6 alkyl group;
• a is an integer of at least 1;
• b is an integer of at least 2;
• m is an integer of from 1 to 3;
• and
• n is an integer of from 1 to 1000.

A process for preparing a diepoxide of the following formula (I) or a salt thereof:

• wherein
• R which may be the same or different when more than one R is present, represents a hydroxyl group, a C1-6 alkoxy group, a C1-6 alkyl group a di-C1-6-alkylamino group, or a C6-10 aryl group, or two R may be linked together and form with the carbon atoms to which they are bonded a 5- to 7-membered ring which may contain 1 or 2 heteroatoms selected from oxygen atoms and sulfur atoms;
• R1 and R2
• which may be the same or different when more than one of R1 and R2 is present, represent a hydrogen atom or a C1-6 alkyl group;
• a is an integer of at least 1;
• b is an integer of at least 2;
• m is an integer of from 1 to 3;
• and
• n is an integer of from 1 to 1000, which comprises reacting one or more compounds of the following formula (II):
• wherein R which may be the same or different when more than one R is present, represents a hydroxyl group, a C1-6 alkoxy group, a C1-6 alkyl group, a di-C1-6-alkylamino group, or a C6-10 aryl group, or two R may be linked together and form with the carbon atoms to which they are bonded a 5- to 7-membered ring which may contain 1 or 2 heteroatoms selected from oxygen atoms and sulfur atoms and
• m is an integer of from 1 to 3 with an excess of one or more compounds of the following formula (III)
• wherein R1 which may be the same or different when more than one R1 is present represent a hydrogen atom or a C1-6 alkyl group and a is an integer of at least 1.

Storage-stable two-pack dental root canal filling composition comprising a first paste and a second paste, wherein each paste has a dynamic viscosity at 23° C. that differs by less than 20 Pa·s from the other paste, wherein the first paste comprises one or more diepoxides selected from compounds of the following formula (I) or a salt thereof:

• wherein
• R which may be the same or different when more than one R is present, represents a hydroxyl group, a C1-6 alkoxy group, a C1-6 alkyl group, a di-C1-6-alkylamino group, or a C6-10 aryl group, or two R may be linked together and form with the carbon atoms to which they are bonded a 5- to 7-membered ring which may contain 1 or 2 heteroatoms selected from oxygen atoms and sulfur atoms;
• L1 and L2
• which may be the same or different when more than one of L1 and L2 is present, independently represent a divalent saturated C2-10 hydrocarbyl group or a polysiloxane group;
• a is an integer of at least 1;
• b is an integer of at least 2;
• m is an integer of from 1 to 3;
• and
• n is an integer of from 1 to 1000, n
• and the second paste comprises one or more primary monoamines and/or disecondary amines.