Radiopaque cationically polymerizable compositions comprising a radiopacifying filler, and method for polymerizing same

A photopolymerizable dental composite comprising:

• (a) a cationically active functional group;
• (b) a photoinitiation system capable of initiating cationic polymerization of said cationically active functional group upon exposure to visible light;
• and
• (c) a filler composition comprising a radiopacifying filler in an amount sufficient to render said photopolymerizable composite radiopaque,
• wherein components (a), (b), and (c) are selected such that upon exposure to visible light, said photopolymerizable composite polymerizes to form a polymerized composite having a Barcol hardness, measured using a GYZJ-935 meter, of at least 10 within 30 minutes following initiation of said cationically active functional group at a reaction temperature of 25° C, and said filler composition is selected such that when the amount of said radiopacifying filler is at least 50% by weight of said polymerizable comoposition, said radiopacifying filler has an isoelectric point, measured according to the Isoelectric Point Test Procedure, of no greater than 7.

A polymerizable composition comprising:

• (a) a cationically active functional group;
• (b) an initiation system capable of initiating cationic polymerization of said cationically active functional group;
• and
• (c) a filler composition comprising a radiopacifying filler other than a sulfate in an amount sufficient to render said polymerizable composition radiopaque,
• wherein components (a), (b), and (c) are selected such that said polymerizable composition polymerizes to form a polymerized composition having a Barcol hardness, measured using a GYZJ-935 meter, of at least 10 within 30 minutes following initiation of said cationically active functional group at a reaction temperature of 25° C.;
• and said filler composition is selected such that when the amount of said radiopacifying filler is at least 50% by weight of said polymerizable composition, said radiopacifying filler has an isoelectric point, measured according to the Isoelectric Point Test Procedure, of no greater than 7.

A polymerizable composition comprising:

• (a) a cationically active functional group;
• (b) an initiation system capable of initiating cationic polymerization of said cationically active functional group;
• and
• (c) a filler composition comprising a radiopacifying filler selected from the group consisting of metal oxides, metal halides, metal borates, metal phosphates, metal silicates, metal carbonates, metal germanates, metal tetrafluoroborates, metal hexafluorophosphates, and combinations thereof, in an amount sufficient to render said polymerizable composition radiopaque;
• wherein components (a), (b), and (c) are selected such that said polymerizable composition polymerizes to form a polymerized composition having a Barcol hardness, measured using a GYZJ-935 meter, of at least 10 within 30 minutes following initiation of said cationically active functional group at a reaction temperature of 25° C., and
• wherein said filler composition is selected such that:
• (A) when the amount of said filler composition is 50% by weight of said polymerizable composition, a test polymerizable composition according to the Adsorption Isotherm Analysis Test Procedure that includes said filler composition has an adsorption value of no greater than about 80 micromoles/g filler, as determined by surface area titration according to the Adsorption Isotherm Analysis Test Procedure;
• and/or
• (B) when the amount of said filler composition is 70% by weight of said polymerizable composition, a test polymerizable composition according to the Adsorption Isotherm Analysis Test Procedure that includes said filler composition has an adsorption value of no greater than about 20 micromoles/g filler, as determined by surface area titration according to the Adsorption Isotherm Analysis Test Procedure.

A polymerizable composition comprising:

• (a) a cationically active functional group;
• (b) an initiation system capable of initiating cationic polymerization of said cationically active functional group;
• and
• (c) a filler composition comprising a radiopacifying filler selected from the group consisting of metal oxides, metal halides, metal borates, metal phosphates, metal silicates, metal carbonates, metal germanates, metal tetrafluoroborates, metal hexafluorophosphates, and combinations thereof, in an amount sufficient to render said polymerizable composition radiopaque;
• wherein components (a), (b), and (c) are selected such that said polymerizable composition polymerizes to form a polymerized composition having a Barcol hardness, measured using a GYZJ-935 meter, of at least 10 within 30 minutes following initiation of said cationically active functional group at a reaction temperature of 25° C.;
• and
• wherein said filler composition is selected such that:
• (A) when the amount of said filler composition is 50% by weight of said polymerizable composition, said filler composition causes a change in conductivity of a test solution of no greater than 125 mV, according to the Conductivity Test Procedure;
• and/or
• (B) when the amount of said filler composition is 70% by weight of said polymerizable composition, said filler composition causes a change in conductivity of a test solution of no greater than 60 mV, determined according to the Conductivity Test Procedure.

A polymerizable composition comprising:

• (a) a cationically active functional group;
• (b) an initiation system capable of initiating cationic polymerization of said cationically active functional group;
• and
• (c) a filler composition comprising a sol-gel-derived radiopacifying filler selected from the group consisting of metal oxides, metal halides, metal borates, metal phosphates, metal silicates, metal carbonates, metal germanates, metal tetrafluoroborates, metal hexafluorophosphates, and combinations thereof, in an amount sufficient to render said polymerizable composition radiopaque;
• wherein components (a), (b), and (c) are selected such that said polymerizable composition polymerizes to form a polymerized composition having a Barcol hardness, measured using a GYZJ-935 meter, of at least 10 within 30 minutes following initiation of said cationically active functional group at a reaction temperature of 25° C.;
• and
• wherein said filler composition is selected such that said filler composition has a relative peak height of greater than 80% as determined by Fourier Transform Infrared Spectroscopy (FTIR) according to the FTIR Analysis Test Procedure.