PROBLEM TO BE SOLVED: To provide dental hardening compositions used for dental filling restorative materials, crown prosthodontic materials such as inlays, crowns and bridges, abutment tooth construction materials, and dental CAD/CAM block materials and the like.SOLUTION: A dental hardening composition contains a hardening resin (A), a porous inorganic filler (B) and polymerization initiator (C), wherein the porous inorganic filler (B) consists of a silicon dioxide and an oxide containing at least one other metallic elements, and has the ratio (I1/I2) of a maximum absorbance (I1) of 3730 to 3750 cm-1 to a maximum absorbance (I2) of 3000 to 3600 cm-1 in infrared absorption spectrum is 1 or more to 3 or less. The other metallic elements of the porous inorganic filler (B) is an oxide containing at least zirconium.SELECTED DRAWING: NoneCOPYRIGHT: (C)2017,JPO&INPIT【課題】歯科用充填修復材料、インレー、クラウン、ブリッジなどの歯冠補綴材料、支台歯築造用材料、歯科CAD/CAM用ブロック材料などに使用される歯科用硬化性組成物の提供。【解決手段】硬化性樹脂(A)、多孔質無機充填材(B)および重合開始材(C)を含む歯科用硬化性組成物であって、多孔質無機充填材(B)は二酸化珪素と、少なくとも1種の他の金属元素を含む酸化物から成り、かつ赤外線吸収スペクトルにおいて、3730から3750cm-1の最大吸光度(I1)と3000から3600cm-1の最大吸光度(I2)の比(I1/I2)が1以上3以下である歯科用硬化性組成物。多孔質無機充填材(B)の他の金属元素が少なくともジルコニウムを含む酸化物である歯科硬化性組成物。【選択図】なし
