PROBLEM TO BE SOLVED: To provide a dental adhesive pretreatment material that can be applied to both of enamel and dentin even in an oral cavity, irrespective of the material of prosthesis.SOLUTION: A dental adhesive pretreatment material composition contains a phosphate group-containing polymerizable compound represented by formula (1), an inorganic filler, and a high viscosity solvent. [Ris H or an alkyl group； X is O, S or substituted/unsubstituted N； Y is an oxyalkylene group].SELECTED DRAWING: None【課題】補綴物の材質を問わず、口腔内においてもエナメル質にも象牙質にも適用できる歯科用接着前処理材の提供。【解決手段】式（１）で表されるリン酸基含有重合性化合物、無機フィラー、及び高粘度溶媒を含有する、歯科用接着前処理材組成物。[Ｒ１はＨ又はアルキル基；ＸはＯ、Ｓ又は置換／非置換のＮ；Ｙはオキシアルキレン基]【選択図】なし
