Dental composite material having stable pasty property

A method for manufacturing a composite material comprising a filler, a polymerizable monomer, and a polymerization initiator, the method comprising a mixed polymerizable monomer preparing step, a silanation step, a silanated filler preserving step, a composite material preparing step, a composite material preserving step, a composite material filling step, and a small quantity preserving container preserving step, wherein:

• the mixed polymerizable monomer preparing step comprises charging a polymerization initiator into a polymerizable monomer in a mixing container, and mixing the polymerizable monomer and the polymerization initiator at a mixing temperature of 1-60° C. for a mixing period of 1 minute-24 hours to prepare a mixed polymerizable monomer,
• the silanation step comprises preparing a silane treatment liquid containing 1-40% of silane coupling agent, and 99-60% of organic solvent and/or water by mixing the silane coupling agent and the organic solvent and/or water, charging the silane treatment liquid into the filler in the mixing container at the a weight ratio of 1-15 parts by weight of the silane coupling agent based on 1 part by weight the filler the silane coupling agent to the filler of 1:100 to 15:100, and mixing the filler and the silane treatment liquid at mixing temperature of 1-60° C. for a mixing period of 1 minute-24 hours to prepare a silanated filler,
• the silanated filler preserving step comprises preserving the silanated filler for a preserving period of 30-600 days,
• the composite material preparing step comprises performing a kneading step and a defoaming step, wherein
• the kneading step comprises kneading the mixed polymerizable monomer and the silanated filler at a kneading temperature of 5-60° C. for a kneading period of 5-40 minutes after charging the silanated filler into the mixed polymerizable monomer to prepare a kneaded mixture of the mixed polymerizable monomer and the silanated filler, wherein a ratio of the silanated filler to the mixed polymerizable monomer is 0.1-9 parts by weight of the silanated filler to 1 part by weight of the mixed polymerizable monomer, and
• the defoaming step comprises defoaming the kneaded mixture of the mixed polymerizable monomer and the silanated filler at 5-200 Torr for a defoaming period of 5-30 minutes to prepare a composite material,
• the composite material preserving step comprises preserving 1-8 liters of the composite material prepared in the composite material preparing step at a preserving temperature of 1-25° C. for a preserving period of 10 days-1.5 years,
• the composite material filling step comprises filling the composite material extruded from a nozzle of a filling machine into a small quantity preserving container having 1-50 cc of volume, and
• the small quantity preserving container preserving step comprises preserving the composite material in the small quantity preserving container at a preserving temperature of 1-40° C. for a preserving period of 50 days-5 years.