Cationically hardenable dental composition, process of production andn use thereof

Abstract

The invention relates to a hardenable dental composition comprising component (A) comprising a cationically hardenable compound, component (B) comprising an initiator being able to initiate the hardening reaction of the cationically hardenable compound, and component (C) comprising a filler, wherein the filler comprises a filler body and a filler surface, the filler surface comprising side groups with polar moieties. The invention also relates to a process of producing the dental composition, to the use of the dental composition as dental impression material and to a method of taking an impression of dental tissue.

1 . A hardenable dental composition comprising
 component (A) comprising a cationically hardenable compound,   component (B) comprising an initiator being able to initiate the hardening reaction of the cationically hardenable compound, and   component (C) comprising a filler,   wherein the filler comprises a filler body and a filler surface, the filler surface comprising side groups with polar moieties.   
     
     
         2 . The dental composition according to  claim 1 , wherein the polar moieties are selected from ethers, alcohols, thioles, phosphines, amines, amide, urethanes, esters, oxiranes, oxetanes, thiiranes, hydrated furanes and combinations thereof. 
     
     
         3 . The dental composition according to any of the preceding claims, wherein the filler body comprises quartz, cristobalite, silicates, mixtures and combinations thereof. 
     
     
         4 . The dental composition according to any of the preceding claims, wherein the particle size of the filler (d50 value) is within a range from about 0.1 to about 40 μm. 
     
     
         5 . The dental composition according to any of the preceding claims, the cationically hardenable compound comprising a hardenable prepolymer, the prepolymer comprising a backbone and reactive side groups, the backbone of the prepolymer comprising moieties selected from polyether, polyesters, polyurethanes and combinations thereof. 
     
     
         6 . The dental composition according to any of the preceding claims, the cationically hardenable compound comprising a hardenable prepolymer comprising a backbone and reactive side groups, the reactive side groups being characterized by the following formula 
       
         
           
           
               
               
           
         
         wherein 
         R represents H, C1-C12 alkyl, C2-C12 alkenyl, C2-C12 alkinyl, C7-C15 alkylaryl, C7-C15 arylalkyl or C3-C12 cycloalkyl, and wherein hydrogen atoms can be replaced by Cl or F and/or wherein up to about 5 carbon atoms may be replaced by atoms or group of atoms selected from O, CO, N or S, 
         E represents a C1-C18 branched or unbranched hydrocarbon chain wherein up to about 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. 
       
     
     
         7 . The dental composition according to any of the preceding claims, the initiator being selected from components which can be classified as Lewis or Broensted acids, mixtures and combinations thereof. 
     
     
         8 . The dental composition of any of the preceding claims comprising component (D) comprising one or more additive(s) selected from retarders, rheology modifier(s), thixotropic agent(s), diluting agent(s), inhibitor(s), pigment(s), dye(s), plastizer(s), odorous substance(s), flavouring(s), stabilizer(s), mixtures and combinations thereof. 
     
     
         9 . The dental composition of any of the preceding claims comprising component (E) comprising at least one surfactant. 
     
     
         10 . The dental composition of any of the preceding claims, being characterized by at least one of the following parameters before hardening:
 Consistency (according to ISO 4823) of 0, 1, 2 or 3, or   Setting time within about 15 min after mixing at ambient conditions.   
     
     
         11 . The dental composition of any of the preceding claims, being characterized by at least one of the following parameters after hardening:
 Elongation at break (according to DIN 53504): at least about 150   Tensile Strength (according to DIN 53504): at least about 1.5   Shore Hardness A (according to DIN 53504; after 24 h): at least about 20.   
     
     
         12 . Process of producing a dental composition as described in any of the preceding claims, comprising a mixing step. 
     
     
         13 . A kit of parts or container comprising a base paste and a catalyst paste separated from each other before use, wherein the base paste comprises component (A) and the catalyst paste comprises component (B), and wherein component (C) and the optional components (D) and (E) can be present either in the base paste or the catalyst paste or the base paste and the catalyst paste, and wherein components (A) to (E) are as described in any of the preceding claims. 
     
     
         14 . Use of the dental composition as described in any of  claims 1  to  11  as dental impression material, for producing dental impression materials or for producing crowns and bridges. 
     
     
         15 . Method of taking an impression of dental tissue, comprising
 a. providing a dental composition as described in any of  claims 1  to  11     b. placing the dental composition into contact with said dental tissue,   c. allowing the dental composition to harden, and   d. removing the dental composition from the dental tissue.