US1889622A - Dental impression wax composition - Google Patents

Description

Patented Nov. 29, 1932 UNITED STATES ANGELO c. ANTONUCCI, or IHILADELPHIA, PENNSYLVANIA DENTAL IM PRESSION WAX COMPOSITION R Drawing.

This invention relates to new and useful improvements in thermoplastic dental impression wax compositions, and processes of compounding the same. Y

An object of the invention-'is'to make a thermoplastic dental impression wax composition particularly adapted for making impressions, and for the manufacture of plates and bridge work such as used in dental practice. 1 l

A further and particular object of the invention is to produce a thermoplastic dental impression wax composition that is quite soft when warm, andis both rigid and strong when cool, and which may be quickly cooled so as not to produce distortion after the impression has been taken.

A further object is to produce thermoplastic dental impression wax compositions in suitable colors, particularly in pink shades simulating the color of human gums.

Shellac, and shellac mixtures have been frequently used for dental impression wax compositions, but" heretofore such composi- F725 tions ontaining hellac have not been entirely satisfactory for dental service.

Many substances which function as plasticizers have been added to shellac with the hope that satisfactory compositions would 7730 be produced thereby, but as far as I know not any of such compositions fully meet'the exacting requirements demanded of a successful dental impression wax.v

After a long period of research on this class of work, I have found that if shellac is blended or plasticized with certain mixed fatty acids and suitable inert material, in the proper proportions, entirely successful dental impression wax compositions may be made therefrom. I have also found that such improved compositions may be readily colorcd so as to be entirely acceptable for dental impression waxes.

Of the numerous materials that I have used for plasticizing shellac to produce a composition suitable for animpression wax, and for dental plate work, I have found that the combined fatty acids from Japan wax, palm oil, and certain grades of tallow, have produced entirely satisfactory compositions.

Application nIed March 1, 1932. Serial No. 596,156.

When beef tallow is used I prefer to use the harder grades. Such single acids as stearic acid, palmitic acid, oleic acid, and similar liquid and solid acids have been used, but the fatty acids from Japan wax, palm oil, and tallow, are preferred. Fatty acidsfrom drying oils are less suitable than those above noted, due to their tendency to a gradual hardening of the mass, and the rendering of said mass more brittle in the course of time. The fatty acids derived from Japan wax, palm oil, and tallow, have proved to be entirely satisfactory when used alone, but I have also used compositions containing such acids with a small amount of rosin, and such rosin-containing compositions have been found to be highly eflicient. Compositions consisting ofpure rosin, or largely of rosin, have not provedto be satisfactory because of the brittleness of the final product, but the I presence of a minor proportion of rosin mixed with the mixed fatty acids, produces a composition which is entirely satisfactory for the exacting demands of dental service.

When I have used rosin, I have found it advantageous to dissolve ordinary rosin-containing laundry soap and warm water, and to set free the combined fatty and resin acids therein with an acid, such as a diluted sulphuric acid, the separated and fatty acids are now washed thoroughly and used as indicated in formulas given herein. Such separated acids may be substituted for a part of the fatty acids described above, from'less than one percent to upwards of about fifty percent thereof. I have found that a small amount of one or'more polyhydric alcohols may be added to the composition with advantage, as it adds to the plasticity. Examples of such polyhydric alcohols as have been found to be beneficial in this class of work are gylcerine, a

glycol such asethylene glycol, or diethylene glycol, as indicated hereafter. i Entirely satisfactory compositions for dental impression wax service may contain the following ingredients in approximately the proportions indicated; after the melted in- .gredients have been thoroughly stirred until they are homogeneous, they may be poured into the molds to harden.

Shellac From about 33 percent to about 50 percent by weight;

Filler (talc or French chalk) From about 25 percent to about percent by weight; Coloring matter (sufficient to produce the desired shade) Fatty acids Remainder.

Shellac From about 33 percent to about percent by Weight;

Filler (talc or French chalk) From about 25 percent to about 45 percent by weight;

One or more polyhydric alcohols From about 1 percent to about 5 percent by weight Coloring matter (sufficient to produce the desired shade) Fatty acids Remainder.

Shellac From about 33 percent to about 50 percent by weight;

Filler (talc or French cha1k) From about 25 percent to about 45 percent by weight;

One or more polyhydric alcohols From about 1 percent to about 5 percent by weight Coloring matter (sufiic1ent to produce the desired shade) Mixed acids, including one or more fatty acids, and resin acids Remainder. Shellac From about 38 percent to about 50 percent by Shellac From about 33 percent to about 50 percent by weight;

Filler (talc or French chalk) From about 25 percent to about 45 percent by weight;

A glycol From about 1 percent to about 5 percent by weight Coloring matter (suliicient to produce the desired shade) Fatty acids Remainder.

Shellac From about 33 percent to about 50 percent by weight; Filler (talc or French chalk) From about 25 percent to about 45 percent by weight;

Coloring matter (suflicient to produce the desired shade) Japan wax fatty acids Remainder.

Shellac From about 33 percent to about 50 percent by weight;

Filler (talc or French chalk) From about 25 percent to about 45 percent by weight; Coloring matter (sufficient to produce the desired shade) Tallow fatty acids Remainder.

Shellac About 45 percent by weight; Filler (talc or French chalk) About 30 percent by weight; Palm oil fatty acids About 24.95 percent by weight; Coloring matter (ceresin red B.oil soluble dye) About .05 percent by weight Shellac About 45 percent by weight; Filler (talc or French chalk) About 30 percent by weight; Palm oil fatty acids AboutH22.45 percent by \VOlgl Glycerine About 2.5 percent by weight; Coloring matter (ceresin red B.oil soluble dye) About .05 percent by weight Instead of the ceresin red B, other colors may be used. I have found that so-called toluidin toners to be suitable, for example,

about one-half percent of the color is an entirely satisfactory proportion to add to the composition.

The above composition may be varied in percentage of some of its components without departing from the present invention. The preparations may be compounded in different Ways so as to produce smooth and homogeneous compositions as to color and filler; but an entirely satisfactory method is to melt the shellac at a temperature of about 250 F. to 260 E, which may be done in a jacketed kettle with steam under moderate pressure, and to this is added one-half of the total quantity of the fatty acids, which is thoroughly stirred into the melted shellac; in an other kettle the balance of the fatty acids are melted to which is then added the coloring matter, and finally the filler, and the entire mass thoroughly stirred; after the second part of the mixture has been thoroughly blended, it is added to the first part containing the shellac, and the entire mass thoroughly stirred until a homogeneous mass is obtained. When glycerine is used, it is prefer-- able to add it as the last ingredient, after the remaining components have been melted, and the mass thoroughly stirred to distribute the glycerine uniformly therethrough.

I claim 1. A dental wax composition consisting of About 45 percent by weight About 30 percent by weight;

Mixed acids, including one or more fatty acids, and resin acids Remainder.

2. A dental wax composition consisting of Shellac About 45 percent by weight; Filler About 30 percent by weight Coloring matter Sufigciznt to produce desired s a e; A polyhydric alcohol About 2.5 percent by weight; Mixed acids, including one or more fatty acids and up to about fifty per cent of resin acids Remainder.

3. A dental wax composition consisting of Shellac About 45 percent by weight; Filler About 30 percent by weight; Coloring matter Sufpcipnt to produce desired s in e; Glyccrine About 2.5 percent by weight; Fatty acids a- Remainder.

4. A dental wax composition consisting of Shellac About 45 percent by weight Filler (talc, French chalk and the like) About 30 percent by we1ght; Coloring matter Sufiicient to produce desired shade; Palm oil fatty acids Remainder.

5. A dental wax composition consisting of Shellac About 45 percent by weight Filler (talc. French chalk and the like) s About 30 percent by weight;

Coloring matter Sufllicignt to produce desired s m e;

Glycerine About 2.5 percent by weight Palm oil fatty acids Remainder.

6. A dental wax composition consisting of Shellac About 45 percent by weight Filler (talc. French chalk and the like) About 30 percent by weight: Coloring matter Sufilicident to produce desired s 1a e; Tallow fatty acids Remainder.

7. A dental wax composition consisting of Shellac About 45 percent by weight; Filler (talc. French chalk and the like) About 30 percent by welght; Coloring matter Suflgcident to produce desired s a e.; Glycerine About 2.5 percent by Weight; Tallow fatty acids Remainder.

In testimony whereof I hereby aflix my signature.

ANGELO C. ANTONUCCI.