EP0267274A1 - Dental impression composition and method of making - Google Patents
Dental impression composition and method of makingInfo
- Publication number
- EP0267274A1 EP0267274A1 EP87903647A EP87903647A EP0267274A1 EP 0267274 A1 EP0267274 A1 EP 0267274A1 EP 87903647 A EP87903647 A EP 87903647A EP 87903647 A EP87903647 A EP 87903647A EP 0267274 A1 EP0267274 A1 EP 0267274A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- gel
- low temperature
- dental impression
- tensile strength
- amount
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/90—Compositions for taking dental impressions
Definitions
- the present invention has to do with dental impression materials, namely reversible hydrocolloid gel compositions having improved strength and working properties by virtue of the use of dipropylene glycol in the compositions in lieu of a portion of the water normally used to form the gels.
- impression materials In dental practice, the professional uses impression materials to obtain impressions of teeth which are then used to mold caps, crowns and inlay, or other prosthesis. Precision of impression molds is a paramount consideration for comfort of the prosthesis. Realizing precision of impression is dependent on obtaining a good impression in the first place, and this requires workability in the impression material used, and maintaining the good impression and this requires high gel strength and tensile strength in the gelled impression composition during removal from the teeth and through use in the forming the plaster from which the prosthesis is to be made.
- reversible hydrocolloid gels as impression compositions since these are unparalleled for accuracy. These gels are obtained by mixing water and a gel base such as agar-agar, and tempering the gel in a conditioning bath until used.
- the low temperature tempering, high gel strength, high tensile strength dental impression composition consisting essentially of a reversible hydrocolloid gel forming base and an aqueous reagent in an amount sufficient to form a reversible gel with the base, the reagent comprising from 50 to 95% by weight water and the balance dipropylene glycol.
- the gel forming base is agar-agar; the composition is free of glycerine; the weight ratio of aqueous reagent to gel forming base is between 8 and 12; and there may be included also an acid buffering compound in effective amount, e.g. a borate radical donor compound in acid buffering amount in the composition, such as a metal borate salt, particularly zinc borate.
- an acid buffering compound in effective amount, e.g. a borate radical donor compound in acid buffering amount in the composition, such as a metal borate salt, particularly zinc borate.
- a low temperature tempering, high gel strength, high tensile strength dental impression composition consisting essententially of a reversible hydrocolloid gel forming base and an aqueous reagent in an amount equal to the amount of water sufficient to from a reversible gel with the base, the reagent comprising water in relatively reduced amount to increase the gel strength and the tensile strength of the gel and the balance dipropylene glycol in an amount maintaining workability in the impression material with the reduced amount of water.
- the weight ration of diproylene glycol to gel base in the composition is between 1.5 and 5.0;
- the gel forming base is agar-agar;
- the composition is free of glycerine;
- the weight ratio of aqueous reagent to gel forming base is between 8 and 12; there is also present an acid buffering compound in effective amount;
- the acid buffering compound is a borate radical donor compound present in acid buffering amount in the composition;
- the borate radical donor compound is zinc borate; and the zinc borate is present in an amount of 5 to 20% by weight based on the weight of the gel base.
- a low temperature tempering, high gel strength dental impression composition consisting essentially of from 8 to 12 parts agar-agar, from 60 to 80 parts water, from 15 to 30 parts dipropylene glycol, and from .3 to 2.5 parts of borate radical donor compound, per 100 parts by weight, wherein the borate radical donor compound is zinc borate.
- the invention further contemplates the method of increasing the gel strength and tensile strength of reversible hydrocolloid compositions comprising a reversible hydrocolloid forming base and a predetermined weight amount of water sufficient to form a gel with the base, including omitting from 10 to 35% of the predetermined amount of water and adding to the composition an amount of dipropylene glycol equal to from 50 to 150% of the water weight amount omitted.
- the present composition includes a reversible hydrocolloid gel forming base and an aqueous reagent.
- the base is typically agar-agar, but may be any of the gel forming materials known in the art including Irish moss, Iceland moss, etc.
- the aqueous reagent comprises water and the dipropylene glycol.
- the reagent typically comprises from 50 to 95% by weight water and the balance dipropylene glycol, with preferred proportions being 65 to 75 weight percent water and conversely 35 to 25 weight percent of the glycol.
- the aqueous reagent is preferably free of substantially free (less than 5% by weight) of glycerine which has been found to disadvantageous in formulating a composition which is temperable at the lower range of less than 150°F and preferably about 130 °F. rather than the typical 150 °F.
- the aqueous reagent is typically present in an amount of 8 to 12 parts by weight per part of gel forming base, and preferably about 10 parts per part of base, with the weight ratio of dipropylene glycol to gel base in the composition being in the 1.5 to 5 range and preferably about 2.5 to 3.5.
- borate radical compounds have been found highly useful, especially zinc borate in amounts of 5 to 20% by weight based on the weight of the gel base.
- a typical composition according to the invention is prepared by placing the following materials in a suitable heated vessel: 140 parts by weight of agar-agar melted in 1050 parts of boiling water; a thickener at 10 parts and dissolved into the agar-agar water mixture; zinc borate at 15 parts predissolved in a minimum amount of water; and 350 parts of dipropylene glycol with flavoring and colorant if desired and the entire mass blended until uniform and then the mixture is put up in small tubes for use by the dentist.
- the composition contains less than the usual amount of water by about 10 to 35%. This reduced ⁇ amount of water translates to greater gel strength and greater tensile strength in the set composition.
- the reduced amount of water makes the composition relatively more viscous, which is useful in obtaining impressions on undercuts and vertical surfaces.
- the viscosity is in the nature of thixotropy, and under spatulation, syringing or like forming techniques, the viscosity is a benefit and not a drawback, where the omitted water is replaced by from 50 to 150% of the water weight amount of the dipropylene glycol.
Landscapes
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Dental Preparations (AREA)
Abstract
Composition pour moulages dentaires possédant une teneur en eau relativement plus faible et une résistance à la traction et un effet thixotropique relativement plus importants, comportant une quantité efficace de dipropylène glycol qui compense la réduction de la teneur en eau et confère à la composition l'aptitude à être travaillée à des températures de stockage aussi faibles que 130°F.Composition for dental moldings having a relatively lower water content and a relatively greater tensile strength and thixotropic effect, comprising an effective amount of dipropylene glycol which compensates for the reduction in water content and gives the composition the ability to be worked at storage temperatures as low as 130 ° F.
Description
Dental Impression Composition And Method Of Making Technical Field
The present invention has to do with dental impression materials, namely reversible hydrocolloid gel compositions having improved strength and working properties by virtue of the use of dipropylene glycol in the compositions in lieu of a portion of the water normally used to form the gels.
Background of the Invention
In dental practice, the professional uses impression materials to obtain impressions of teeth which are then used to mold caps, crowns and inlay, or other prosthesis. Precision of impression molds is a paramount consideration for comfort of the prosthesis. Realizing precision of impression is dependent on obtaining a good impression in the first place, and this requires workability in the impression material used, and maintaining the good impression and this requires high gel strength and tensile strength in the gelled impression composition during removal from the teeth and through use in the forming the plaster from which the prosthesis is to be made.
Many dentists prefer the use of reversible hydrocolloid gels as impression compositions since these are unparalleled for accuracy. These gels are obtained by mixing water and a
gel base such as agar-agar, and tempering the gel in a conditioning bath until used.
It is known to use glycerol in hydrocolloid compositions, but such systems require a higher temperature tempering bath to avoid loss of workability, and thus a pre- application conditioning step, and to use borates therein for an increase in strength of reversible hydrocolloid gel materials, but such systems are lumpy, and too viscous for ready workability.
Summary of the Inventions
It is an object of the present invention to provide an improved dental impesssion composition. It is another object to provide a dental impression material which is improved in gel strength and tensile strength, and which has improved workability for easier and more accurate impression taking. It is yet another object to provide a dental impression material which may be maintained in a tempering bath at about 130 °F. rather than the usual 150 °F. while maintaining superior workability, for direct application to the patient without an extra cooling step. It is another object to enable the use of metal borate salts in dental impression materials for increased strength without concomitant lumpiness and undue viscosity in the material.
These and other objects of the invention to become apparent hereinafter are realized in accordance with the invention in the low temperature tempering, high gel strength, high tensile strength dental impression composition consisting essentially of a reversible hydrocolloid gel forming base and an aqueous reagent in an amount sufficient to form a reversible gel with the base, the reagent comprising from 50 to 95% by weight water and the balance dipropylene glycol.
In particular embodiments, the gel forming base is agar-agar; the composition is free of glycerine; the weight ratio of aqueous reagent to gel forming base is between 8 and 12; and there may be included also an acid buffering compound in effective amount, e.g. a borate radical donor compound in acid buffering amount in the composition, such as a metal borate salt, particularly zinc borate.
In a preferred embodiment of the invention, there is provided a low temperature tempering, high gel strength, high tensile strength dental impression composition consisting essententially of a reversible hydrocolloid gel forming base and an aqueous reagent in an amount equal to the amount of water sufficient to from a reversible gel with the base, the reagent comprising water in relatively reduced amount to increase the gel strength and the tensile strength of the gel and the balance dipropylene glycol in an amount
maintaining workability in the impression material with the reduced amount of water.
In this as in other embodiments of the invention preferably the weight ration of diproylene glycol to gel base in the composition is between 1.5 and 5.0; the gel forming base is agar-agar; the composition is free of glycerine; the weight ratio of aqueous reagent to gel forming base is between 8 and 12; there is also present an acid buffering compound in effective amount; the acid buffering compound is a borate radical donor compound present in acid buffering amount in the composition; the borate radical donor compound is zinc borate; and the zinc borate is present in an amount of 5 to 20% by weight based on the weight of the gel base.
In a highly particularly preferred embodiment of the invention there is provided a low temperature tempering, high gel strength dental impression composition consisting essentially of from 8 to 12 parts agar-agar, from 60 to 80 parts water, from 15 to 30 parts dipropylene glycol, and from .3 to 2.5 parts of borate radical donor compound, per 100 parts by weight, wherein the borate radical donor compound is zinc borate.
The invention further contemplates the method of increasing the gel strength and tensile strength of
reversible hydrocolloid compositions comprising a reversible hydrocolloid forming base and a predetermined weight amount of water sufficient to form a gel with the base, including omitting from 10 to 35% of the predetermined amount of water and adding to the composition an amount of dipropylene glycol equal to from 50 to 150% of the water weight amount omitted.
Detailed Description
As noted above, the present composition includes a reversible hydrocolloid gel forming base and an aqueous reagent. The base is typically agar-agar, but may be any of the gel forming materials known in the art including Irish moss, Iceland moss, etc. The aqueous reagent comprises water and the dipropylene glycol.
The reagent typically comprises from 50 to 95% by weight water and the balance dipropylene glycol, with preferred proportions being 65 to 75 weight percent water and conversely 35 to 25 weight percent of the glycol. The aqueous reagent is preferably free of substantially free (less than 5% by weight) of glycerine which has been found to disadvantageous in formulating a composition which is temperable at the lower range of less than 150°F and preferably about 130 °F. rather than the typical 150 °F.
The aqueous reagent is typically present in an amount of 8 to 12 parts by weight per part of gel forming base, and preferably about 10 parts per part of base, with the weight ratio of dipropylene glycol to gel base in the composition being in the 1.5 to 5 range and preferably about 2.5 to 3.5.
The use of a buffering compound improves the gel life, and for this purpose borate radical compounds have been found highly useful, especially zinc borate in amounts of 5 to 20% by weight based on the weight of the gel base.
The combination of zinc borate and dipropylene glycol with agar-agar gel forming base in the just discussed proportions has been found to provdie a uniquely advantageous hydrocolloid dental impression material with nearly ideal properties of gel strength (improved about 30% over glycerine formulas) tempering ability (130 F. vs. 150 F. for glycerine formulas) , reduced rate of evaporation, dramatically better texture and workability than glycerine formulas at the cooler temper, and accuracy of impression particularly at undercuts is heightened.
EXAMPLE
A typical composition according to the invention is prepared by placing the following materials in a suitable heated vessel: 140 parts by weight of agar-agar melted in
1050 parts of boiling water; a thickener at 10 parts and dissolved into the agar-agar water mixture; zinc borate at 15 parts predissolved in a minimum amount of water; and 350 parts of dipropylene glycol with flavoring and colorant if desired and the entire mass blended until uniform and then the mixture is put up in small tubes for use by the dentist.
It is noted that the composition contains less than the usual amount of water by about 10 to 35%. This reduced ■amount of water translates to greater gel strength and greater tensile strength in the set composition. The reduced amount of water makes the composition relatively more viscous, which is useful in obtaining impressions on undercuts and vertical surfaces. Nontheless the composition exhibits smooth workability, the viscosity is in the nature of thixotropy, and under spatulation, syringing or like forming techniques, the viscosity is a benefit and not a drawback, where the omitted water is replaced by from 50 to 150% of the water weight amount of the dipropylene glycol.
Claims
Claims
1. Low temperature tempering, high gel strength, high tensile strength dental impression composition consisting essentially of a reversible hydrocolloid gel forming base, from 0 to 25% by weight of a borate radical donor compound based on the weight of said base, and an aqueous reagent in an amount sufficient to form a reversible gel with said base, said reagent comprising from 50 to 85% by weight water and the balance dipropylene glycol.
2. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 1, in which said gel forming base is agar-agar.
3. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 1, in which said composition is substantially free of glycerine.
4. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 1, in which the weight ratio of aqueous reagent to gel forming base is between 8 and 12.
5. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to
claim 1, in which said borate radical donor compound is present in an amount of at least 5% by weight.
6. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 5, in which said borate radical donor compound is zinc borate.
7. Low temperature tempering, high gel strength, high tensile strength dental impression composition consisting essentially of a reversible hydrocolloid gel forming base and an aqueous reagent in an amount equal to the amount of water sufficient to form a reversible gel with said base, said reagent comprising water in relatively reduced amount to increase the gel strength and the tensile strength of said gel and the balance dipropylene glycol in an amount maintaining workability in the impression material with said reduced amount of water.
9. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 7, in which the weight ratio of dipropylene glycol to gel base in said composition is between 1.5 and 5.0.
10. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 9, in which said gel forming base is agar-agar.
11. Low temperature tempring, high gel strength, high tensile strength dental impression composition according to claim 10, in which said composition is free of glycerine.
12. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 10, in which the weight ratio of aqueous reagent to gel forming base is between 8 and 12.
13. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 12, including also an acid buffering compound in effective amount.
14. Low temperature tempering, high gel strength, high tensile strength dental impression material according to claim 13, in which said acid buffering compound is a borate radical donor compound present in acid buffering amount in said composition.
15. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 14, in which said borate radical donor compound is zinc borate.
16. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 15, in which said zinc borate is present in an amount of 5 to 20% by weight based on the weight of said gel base.
17. Low temperature tempering, high gel strength dental impression composition consisting essentially of from 8 to 12 parts agar-agar, from 60 to 80 parts water, from 15 to 30 parts dipripylene glycol, and from .3 to 2.5 parts of borate radical donor compound, per 100 parts by weight.
18. Low temperature tempering, high gel strength, high tensile strength dental impression composition according to claim 17, in which said borate radical donor compound is zinc borate.
19. Method of increasing the gel strength and tensile strength of reversible hydrocolloid compositions comprising a reversible hydrocolloid forming base and a predetermined weight amount of water sufficient to from a gel with said base, including omitting from 10 to 35% of said predetermined amount of water and adding to the composition an amount of dipropylene glycol equal to from 50 to 150% of the water weight amount omitted.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/865,153 US4772324A (en) | 1986-05-20 | 1986-05-20 | Hydrocollid gel based dental impression composition |
| US865153 | 1986-05-20 | ||
| US06/865,114 US4648906A (en) | 1986-05-20 | 1986-05-20 | High strength dental impression composition |
| US865114 | 1986-05-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0267274A1 true EP0267274A1 (en) | 1988-05-18 |
| EP0267274A4 EP0267274A4 (en) | 1989-05-11 |
Family
ID=27127877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19870903647 Withdrawn EP0267274A4 (en) | 1986-05-20 | 1987-05-19 | Dental impression composition and method of making. |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0267274A4 (en) |
| WO (1) | WO1987007284A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2234383A (en) * | 1939-10-28 | 1941-03-11 | Surgident Ltd | Dental impression composition |
| US2272723A (en) * | 1938-03-12 | 1942-02-10 | Stanley E Noyes | Dental impression material |
| US4234340A (en) * | 1979-05-11 | 1980-11-18 | Pellico Michael A | Antifouling marine coating composition containing agar, a plasticizer and a strengthening agent |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2298835A (en) * | 1941-11-07 | 1942-10-13 | Stanley E Noyes | Dental impression composition |
| CA1043264A (en) * | 1975-03-25 | 1978-11-28 | Martin Cordon | Dentifrices |
| US4242239A (en) * | 1979-06-11 | 1980-12-30 | Warner-Lambert | Bondable agar dental impression material |
| US4394172A (en) * | 1980-08-26 | 1983-07-19 | Dentsply Research & Development Corp. | Non-dusting and fast-wetting impression material and method of preparing same |
-
1987
- 1987-05-19 EP EP19870903647 patent/EP0267274A4/en not_active Withdrawn
- 1987-05-19 WO PCT/US1987/001168 patent/WO1987007284A1/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2272723A (en) * | 1938-03-12 | 1942-02-10 | Stanley E Noyes | Dental impression material |
| US2234383A (en) * | 1939-10-28 | 1941-03-11 | Surgident Ltd | Dental impression composition |
| US4234340A (en) * | 1979-05-11 | 1980-11-18 | Pellico Michael A | Antifouling marine coating composition containing agar, a plasticizer and a strengthening agent |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO8707284A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1987007284A1 (en) | 1987-12-03 |
| EP0267274A4 (en) | 1989-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19880109 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE FR GB LI |
|
| A4 | Supplementary search report drawn up and despatched |
Effective date: 19890511 |
|
| 17Q | First examination report despatched |
Effective date: 19910722 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19911203 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PORTEOUS, DON, D. |