Dental composition having characteristic in silane coupling material compounding index

A dental adhesive composition comprising a matrix wherein the matrix contains

• (A) silane coupling material,
• (B) polymerizable monomer having an acidic group,
• (C) polymerizable monomer having no acidic group, and
• at least one of (D) polymerization initiator and (E) polymerization accelerator,
• (A) silane coupling material contains (A1) silane coupling material represented by structural formula of [Chemical formula 1],
• (In the formula, R3 represents (meth) acryloyl group having an alkyl group of C2 to C15 which may have —O—, —S—, —NH—, —C(O)—O—, —OC(O)—, —OC(O)—NH— and/or —NH—C(O)—O— group, R1 and R2 represent alkyl groups of C1 to C4 and may be the same or different from each other, and n is 1 to 3.)
• (C) polymerizable monomer having no acidic group contains (C1) polymerizable monomer having no acidic group and having one or more hydroxyl groups,
• the (A1) silane coupling material represented by structural formula of [Chemical formula 1] and the (C1) polymerizable monomer having no acidic group and having one or more hydroxyl groups coexist in at least one matrix, and
• the dental adhesive composition satisfies at least one of following formulas (1) and (2).
• 0.005≤Total amount of silane coupling material compounding amount index in matrix((S1×W1)/M1)≤0.070 [Formula (1)]
• (In the formula (1), M1 is a molecular weight of each silane coupling material contained in the matrix, S1 is the number of alkoxysilyl groups in molecule of each silane coupling material contained in the matrix, and W1 is a compounding amount of each silane coupling material in 100 parts by mass of the matrix. The silane coupling material compounding amount index in matrix is calculated by the formula (1) for each type of silane coupling material.)
• 0.001≤Total amount of silane coupling material compounding amount index in composition ((S2×W2)/M2)≤0.015 [Formula (2)]
• (In the formula (2), M2 is a molecular weight of each silane coupling material contained in the composition, S2 is the number of alkoxysilyl groups in the molecule of each silane coupling material contained in the composition, and W2 is a compounding amount of each silane coupling material in 100 parts by mass of the composition. The silane coupling material compounding amount index in the composition is calculated by the formula (2) for each type of silane coupling material.)