DENTAL COMPOSITION COMPRISING AN ISORBIDE COMPONENT

1 . A dental composition provided as a kit of parts comprising a base paste and an initiator paste,

the base paste comprising,

a cationically curable pre-polymer comprising a polyether backbone and at least two aziridine moieties,

filler,

the initiator paste comprising

an initiator being able to start the hardening of the pre-polymer,

filler,

optionally diluent,

the base paste or the initiator paste or the base paste and the initiator paste comprising in addition an isosorbide component, preferably an isosorbide ester.

2 . The dental composition of claim 1 , the isosorbide component being a diester of isosorbide and one or more C 6-12 fatty acids and mixtures thereof.

3 . The dental composition according to claim 1 , the ratio of isosorbide component to cationically curable pre-polymer contained in the composition obtained by mixing the base paste and initiator paste being in a range of 1:1 to 1:10 with respect to weight.

4 . The dental composition according to claim 1 , the isosorbide component being present only in the base paste.

5 . The dental composition according to claim 1 , the initiator being selected from Lewis acids, Broensted acids or precursors of Lewis acids, Broensted acids, or mixtures thereof.

6 . The dental composition according to claim 1 , the initiator being selected from sulphonic acids, salts of a sulphonic acid or mixtures thereof.

7 . The dental composition according to claim 1 , the cationically curable pre-polymer comprising a polyether backbone and at least two aziridine moieties being characterized by the following features:

the aziridine moieties having the formula:

wherein

R represents H, C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 2 -C 12 alkinyl, C 7 -C 15 alkylaryl, C 7 -C 15 arylalkyl or C 3 -C 12 cycloalkyl, wherein hydrogen atoms can be replaced by Cl or F and/or wherein up to 5 carbon atoms can be replaced by atoms or group of atoms selected from O, CO, N or S,

E represents a C 1 -C 18 branched or unbranched hydrocarbon chain wherein up to 5 carbon atoms can be replaced by atoms or group of atoms selected from O, CO, N or S,

G represents a group selected from C(O)O, C(O)NR, C(O), C(O)C(O), C(O)(CH 2 ) m C(O) with m=1 to 10, C(S)NR or CH 2 ,

L represents O, S or NR, with x=0 or 1,

the molecular weight Mn of the polyether backbone being in a range of 500 to 20,000 g/mol.

8 . The dental composition according to claim 1 comprising in addition the following components alone or in combination:

triacyl esters of glycerol,

surfactant,

additives, preferably being selected from pigment(s), flavour(s), stabilizer(s), retarder(s), astringents(s), and mixtures thereof.

9 . The dental composition according to claim 1 , the mixing ratio of the base paste to the initiator paste with respect to volume being in a range of 1:1 to 10:1, in particular 1:1 to 7:1.

10 . The dental composition according to claim 1 , the components being present in the composition obtained by mixing the base paste and the catalyst paste in the following amounts:

cationically curable pre-polymer comprising a polyether backbone and at least two aziridine moieties: 5 to 80 wt. %,

initiator: 1 to 30 wt. %,

filler: 5 to 80 wt. %,

diluent: 0 to 80 wt. %,

isosorbide component: 1 to 30 wt. %,

triacyl esters of glycerol: 0 to 30 wt. %,

surfactant: 0 to 10 wt. %,

additives: 0 to 20 wt. %,

wt. % with respect to the whole composition.

11 . The dental composition according to claim 1 being characterized by the following properties before hardening:

consistency: 0, 1, 2 or 3 according to ISO 4823:2015-08;

viscosity of base paste and/or initiator paste: 2 to 500 Pa*s at 23° C.;

the composition hardening within 15 min within a temperature range of 20 to 40° C. to a rubber elastic mass after mixing the base paste and the initiator paste;

water-contact angle determined 10 sec after mixing the base paste and catalyst paste: equal to or lower than 90° after mixing the base paste and the initiator paste.

12 . The dental composition according to claim 1 , the composition obtained by mixing the base paste and the catalyst paste being characterized as follows:

the cationically curable pre-polymer

being present in an amount of 5 to 80 wt. %, and

the polyether backbone of the pre-polymer having a molecular weight in a range of 500 to 20,000 g/mol,

the initiator

being a sulphonic acid or salt of a sulphonic acid, and

being present in an amount of 1 to 30 wt. %,

the filler

being selected from reinforcing fillers, non-reinforcing fillers and mixtures thereof,

being present in an amount of 5 to 80 wt. %,

the diluent

being present in an amount of 0 to 80 wt. %,

the isosorbide component

being selected from diesters of isosorbide and one or more C 6-12 fatty acids and mixtures thereof, and

being present in an amount of 1 to 30 wt. %,

the triacylester of glycerol

being present in an amount of 5 to 30 wt. %,

surfactant

being present in an amount of 0 to 10 wt. %,

additives

being present in an amount of 0 to 20 wt. %,

wt. % with respect to the whole composition.

13 . A process of taking an impression of dental tissue, the process comprising the steps of

mixing the base paste and the catalyst paste of the dental composition according to claim 1 to obtain a mixed paste,

placing the mixed paste in contact with dental tissue,

waiting until the mixed paste is hardened,

removing the hardened composition from the dental tissue.

14 . A kit of parts comprising the dental composition described in claim 1 and the following items alone or in combination: dental impression tray, mixing device, mixing tips, application syringe, dental retraction material, temporary crown and bridge material.

15 . (canceled)