Dental polyfunctional monomers and dental hydroxyl group-containing monomers

A dental material comprising a dental polyfunctional monomer which is a product of reaction of a compound represented by general formula (1A), in which a core (X) and a terminal group (Y1A) are bonded to each other directly or via a linking group (Z), with a (meth)acryloyl group-containing isocyanate compound represented by general formula (3):

• X(Y1A)n1aA(Z—Y1A)n1bA (1A)
• wherein in the general formula (1A), n1aA represents a number of terminal groups (Y1A) directly bonded to the core (X), n1bA represents a number of terminal groups (Y1A) bonded to the core (X) via the linking group (Z), and a sum of n1aA and n1bA is equal to a valence of the core (X);
• the core (X) is a C1-200 polyvalent organic group having a valence of not less than 3 containing an oxygen atom or a nitrogen atom in which each an atom bonded to the terminal group (Y1A) or the linking group (Z) is the oxygen atom or the nitrogen atom;
• the terminal group (Y1A) is a (meth)acryloyl group, a C1-20 monovalent hydrocarbon group or an active hydrogen atom, and a plurality of the terminal groups (Y1A) may be the same as or different from each other, with the proviso that among the terminal groups (Y1A) in the compound represented by the general formula (1A), three or more of the terminal groups are active hydrogen atoms or (meth)acryloyl groups, and one or more of the terminal groups are active hydrogen atoms;
• and
• the linking group (Z) is a divalent group represented by general formula (2), and when the compound represented by the general formula (1A) contains a plurality of the linking groups (Z), the linking groups (Z) may be the same as or different from each other;
• wherein in the general formula (2), n2a, n2b, n2c and n2d represent unit numbers of respective repeating units, and are each 0 to 100, a sum of n2a, n2b, n2c and n2d is 1 to 100, a left end of the group is bonded to the core (X), and a right end of the group is bonded to the terminal group (Y1A);
• and
• wherein in the general formula (3), R3a represents a hydrogen atom or a methyl group, R3b represents a C2-6 linear alkylene group or a C2-6 linear oxyalkylene group, and the linear alkylene group or the linear oxyalkylene group is optionally substituted with a C1-6 alkyl group and/or a (meth)acryloyloxymethylene group in place of a hydrogen atom,
• under a condition of (total equivalents/moles of isocyanate groups present in the reaction derived from the compound represented by the general formula (3))/(total equivalents/moles of active hydrogen atoms of (Y1A) bonded to terminal oxygen atoms and nitrogen atoms of the core (X) present in the compound represented by general formula (1A))=1.