PROBLEM TO BE SOLVED: To provide a conventional dental hydraulic temporary sealing material having a drawback that the curability decreases with time even when the initial curability is high, so that sufficient curability cannot be exhibited after a long period of time from production. When the temporary sealing material moves or deforms when the patient's tongue or opposing teeth come into contact with each other, a gap is created between the temporary sealing material and the tooth substance, which may impair the sealing property. Therefore, an object of the present invention is to provide a dental hydraulic temporary sealing material composition in which a decrease in curability with time is reduced. SOLUTION: A dental hydraulic temporary sealing material containing a component (1) quartz powder. Further, a dental hydraulic temporary sealing material composition containing a component (2) hydraulic inorganic powder, a component (3) an organic solvent, and a component (4) a resin. [Selection diagram] None【課題】従来の歯科用水硬性仮封材は初期硬化性が高い場合でも経時的に硬化性が低下していくという欠点があるため、製造から長期間経過すると充分な硬化性を発現できず、患者の舌や対合歯が接触した際に仮封材が動いたり、変形したりすることで、仮封材と歯質の間に隙間を生じ、封鎖性を損なう恐れがあった。そこで、本発明は経時的な硬化性の低下を軽減した歯科用水硬性仮封材組成物を提供することを課題とする。【解決手段】成分（１）石英粉末を含む歯科用水硬性仮封材。さらに、成分（２）水硬性無機粉末、成分（３）有機溶媒、および成分（４）樹脂を含む歯科用水硬性仮封材組成物。【選択図】なし
