Paste-like composition for dental use, and method for producing the same
The present invention provides a paste-like composition for dental use that shows stable consistency and runniness and little stringiness immediately after production and even after long storage. The present invention relates to a paste-like composition for dental use, comprising a polymerizable monomer (A) and a filler (B), the filler (B) comprising a particulate filler (B-1) having an average primary particle diameter of 0.001 to 0.2 μm, and a filler (B-2) having an average primary particle diameter of more than 0.2 μm and 30 μm or less, the paste-like composition having a consistency of 15 to 40 mm, the particulate filler (B-1) having an average secondary particle diameter of 20 μm or less.
1 . A method for producing a paste-like composition for dental use that comprises a polymerizable monomer (A) and a filler (B), and in which the filler (B) comprises a particulate filler (B-1) having an average primary particle diameter of 0.001 to 0.2 μm, comprising:
mixing the polymerizable monomer (A) and the particulate filler (B-1) having an average primary particle diameter of 0.001 to 0.2 μm to obtain an intermediate paste; and
additionally mixing the polymerizable monomer (A) with the intermediate paste to obtain a final paste as the paste-like composition for dental use,
the particulate filler (B-1) being mixed in an amount of 30 to 150 parts by mass relative to total 100 parts by mass of a total amount of polymerizable monomer (A) in obtaining the intermediate paste, wherein:
polymerizable monomer (A) is at least one of a polymerizable monomer having a phosphoric acid group, a polymerizable monomer having a sulfonic acid group, a polymerizable monomer having a carboxylic acid group, a hydrophobic monofunctional polymerizable monomer having no acidic group, an aromatic bifunctional polymerizable monomer having no acidic group, an aliphatic bifunctional polymerizable monomer having no acidic group, and a tri- or higher-functional polymerizable monomer having no acidic group;
the particulate filler (B-1) is not added to the intermediate paste during said additionally mixing to obtain the final paste;
the final paste has a consistency of 15 to 40 mm;
the particulate filler (B-1) contained in the final paste has an average secondary particle diameter of 20 μm or less;
the intermediate paste has a consistency of 5 to 20 mm; and
a content of polymerizable monomer (A) is 5 to 60 parts by mass relative to a total 100 parts by mass of the paste-like composition for dental use.
2 . The method for producing a paste-like composition for dental use according to claim 1 , wherein the particulate filler (B-1) contained in the final paste has an average secondary particle diameter of 10 μm or less.
3 . The method for producing a paste-like composition for dental use according to claim 2 , wherein the intermediate paste has a consistency of 10 to 16 mm.
4 . The method for producing a paste-like composition for dental use according to claim 1 , wherein the particulate filler (B-1) contained in the intermediate paste has an average secondary particle diameter of 100 μm or less.
5 . The method for producing a paste-like composition for dental use according to claim 1 , wherein the paste-like composition for dental use further comprises a filler (B-2) having an average primary particle diameter of more than 0.2 μm and 30 μm or less.
6 . The method for producing a paste-like composition for dental use according to claim 5 , wherein the filler (B-2) is mixed when obtaining the intermediate paste.
7 . The method for producing a paste-like composition for dental use according to claim 5 , wherein the filler (B-2) is mixed when obtaining the final paste.
8 . The method for producing a paste-like composition for dental use according to claim 1 , wherein the particulate filler (B-1) contained in the final paste has an average secondary particle diameter of 5 μm or less.
9 . The method for producing a paste-like composition for dental use according to claim 8 , wherein the paste-like composition for dental use further comprises a filler (B-2) having an average primary particle diameter of more than 0.2 μm and 30 μm or less.
10 . The method for producing a paste-like composition for dental use according to claim 9 , wherein the filler (B-2) is mixed when obtaining the intermediate paste.
11 . The method for producing a paste-like composition for dental use according to claim 9 , wherein the filler (B-2) is mixed when obtaining the final paste.