Hydrogel materials for obturation

A method of filling a root canal with a hydrogel polymer, comprising:

• identifying a tooth having a root canal in need of filling;
• positioning a curable mixture within a handpiece, comprising delivering the curable mixture to the handpiece in two liquid parts;
• forming a liquid jet within the handpiece and using the liquid jet to deliver the two parts;
• partially curing the curable mixture within the root canal with light energy;
• and
• exposing the partially cured mixture within the root canal to heat to form a cured hydrogel polymer within the root canal;
• wherein the curable mixture comprises:
• (a) a water-soluble acrylate-based monomer, a water-soluble acrylamide-based monomer, a water-soluble chelating monomer, or a mixture thereof;
• (b) a free-radical polymerization initiator;
• (c) a radiopaque material;
• and
• (d) an aqueous carrier having a pH in the range of about 7.0 to about 8.4;
• wherein the ingredients (a), (b), (c), and (d) are selected to provide the curable mixture with properties suitable for use as a tooth filling after curing of the curable mixture to form a cured mixture by a polymerization of ingredient (a) that is initiated by ingredient (b).

A curable mixture of ingredients, comprising:

• (a) 20 wt. % to 50 wt % poly(ethylene glycol) diacrylate (PEG);
• (b) 0.5 wt % to 1.5 wt. % N,N′-methylenebis(acrylamide) (MBAA);
• (c) 0.2 wt. % to 1.5 wt % potassium persulfate;
• (d) 0.2 wt. % to 0.6 wt % triethanolamine;
• (e) 5 wt % to 30 wt. % of 5-acrylamido-2,4,6-triiodo isophthtalic acid;
• and
• (f) 20 wt % to 60 wt % of an aqueous carrier,
• wherein the ingredients are selected to provide the curable mixture with properties suitable for use as a tooth filling after curing of the curable mixture to form a cured mixture.

A curable mixture of ingredients, comprising:

• (a) 0.1 wt % to 0.5 wt % 2,2′-azobis[2-(2-imidazolin-2-yl) propane] dihydrochloride;
• (b) 20 wt % to 50 wt % ethoxylated trimethylolpropane triacrylate;
• (c) 10 wt % to 15 wt % poly(ethylene glycol) diacrylate (PEG);
• (d) 5 wt % to 35 wt % 5-acrylamido-2,4,6-triiodo isophthalic acid;
• and
• (f) 15 wt % to 50 wt % water.

A curable mixture of ingredients, comprising:

• (a) 0.1 wt % to 0.5 wt % 2,2′-azobis[2-(2-imidazolin-2-yl) propane] dihydrochloride;
• (b) 0.1 wt % to 2.5 wt % of a light cure initiator;
• (c) 10 wt % to 30 wt % poly(ethylene glycol) diacrylate;
• (d) 0.5 wt % to 2 wt % N,N′-methylenebis (acrylamide) (MBAA);
• (e) optionally, 0.1 wt % to 1 wt % [2-(acryloyloxy)ethyl] trimethyl-ammonium chloride;
• and
• (f) an aqueous carrier,
• wherein the ingredients are selected to provide the curable mixture with properties suitable for use as a tooth filling after curing of the curable mixture to form a cured mixture.

A curable mixture of ingredients, comprising:

• (a) 20 wt % to 50 wt % ethoxylated trimethylolpropane triacrylate;
• (b) 10 wt % to 15 wt % poly(ethylene glycol) diacrylate;
• (c) 0.1 wt % to 3 wt % 2,2′-azobis[2-methyl-N-(2-hydroxyethyl)propionamide;
• (d) 5-acrylamido-2,4,6-triiodo isophthalic acid;
• and
• (e) 15 wt % to 55 wt % aqueous carrier;
• wherein the ingredients are selected to provide the curable mixture with properties suitable for use as a tooth filling after curing of the curable mixture to form a cured mixture.