GB432881A - Improvements in and relating to dental gold fillings - Google Patents
Improvements in and relating to dental gold fillingsInfo
- Publication number
- GB432881A GB432881A GB33593/33A GB3359333A GB432881A GB 432881 A GB432881 A GB 432881A GB 33593/33 A GB33593/33 A GB 33593/33A GB 3359333 A GB3359333 A GB 3359333A GB 432881 A GB432881 A GB 432881A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gold
- solution
- precipitate
- acid
- precipitated
- 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.)
- Expired
Links
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title abstract 12
- 239000010931 gold Substances 0.000 title abstract 12
- 229910052737 gold Inorganic materials 0.000 title abstract 12
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 abstract 18
- 239000002244 precipitate Substances 0.000 abstract 8
- 235000006408 oxalic acid Nutrition 0.000 abstract 6
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 abstract 6
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 abstract 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 4
- 239000003513 alkali Substances 0.000 abstract 4
- 239000007788 liquid Substances 0.000 abstract 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 abstract 4
- 239000001117 sulphuric acid Substances 0.000 abstract 4
- 235000011149 sulphuric acid Nutrition 0.000 abstract 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 4
- 235000010288 sodium nitrite Nutrition 0.000 abstract 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 abstract 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 abstract 2
- 238000009835 boiling Methods 0.000 abstract 2
- 239000012153 distilled water Substances 0.000 abstract 2
- 238000001035 drying Methods 0.000 abstract 2
- 235000019253 formic acid Nutrition 0.000 abstract 2
- FDWREHZXQUYJFJ-UHFFFAOYSA-M gold monochloride Chemical compound [Cl-].[Au+] FDWREHZXQUYJFJ-UHFFFAOYSA-M 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 abstract 2
- 230000001376 precipitating effect Effects 0.000 abstract 2
- 238000001556 precipitation Methods 0.000 abstract 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 abstract 2
- ZNCPFRVNHGOPAG-UHFFFAOYSA-L sodium oxalate Chemical compound [Na+].[Na+].[O-]C(=O)C([O-])=O ZNCPFRVNHGOPAG-UHFFFAOYSA-L 0.000 abstract 2
- 229940039790 sodium oxalate Drugs 0.000 abstract 2
- 238000005406 washing Methods 0.000 abstract 2
- 230000002421 anti-septic effect Effects 0.000 abstract 1
- 208000002925 dental caries Diseases 0.000 abstract 1
- 239000004317 sodium nitrate Substances 0.000 abstract 1
- 235000010344 sodium nitrate Nutrition 0.000 abstract 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C5/00—Filling or capping teeth
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/84—Preparations for artificial teeth, for filling teeth or for capping teeth comprising metals or alloys
- A61K6/844—Noble metals
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)
- Dentistry (AREA)
- Plastic & Reconstructive Surgery (AREA)
- Dental Preparations (AREA)
Abstract
Spongy cohesive gold for dental fillings is prepared by precipitating gold from a solution, heating the precipitate in a high boiling liquid, such as concentrated phosphoric acid or commercial (unpurified) sulphuric acid, at a temperature between 150 and 250 DEG C., and washing and drying the precipitate. In use, the tooth cavity need not be dried and the gold is inserted by means of an instrument moistened with a dilute antiseptic solution and is compacted by pressure and burnished. Preferably, a gold chloride solution is neutralized by an alkali, heated to 80 DEG C. and the gold precipitated by oxalic acid or sodium nitrite added in excess. The solution and precipitate are then boiled and any gold remaining in solution is precipitated by addition of oxalic acid if sodium nitrite was used for the first precipitation or by addition of sodium oxalate or an alkali if oxalic acid was used. The pH of the solution should be between 6 and 7 at this point. The liquid is then decanted off and the precipitate washed in water, heated to between 150 and 250 DEG C. in commercial sulphuric acid, repeatedly boiled and washed with distilled water, and dried below 100 DEG C. The treatment of gold precipitated by formaldehyde, formic acid or hydrogen peroxide is also referred to. Specification 380,324 is referred to.ALSO:Spongy cohesive gold for dental purposes is prepared by precipitating gold from a solution, heating the precipitate in a high boiling liquid, such as concentrated phosphoric acid or commercial (unpurified) sulphuric acid, to a temperature between 150 and 250 DEG C., and washing and drying the precipitate. Preferably a gold chloride solution is neutralized with alkali, heated to 80 DEG C., and the gold precipitated by oxalic acid or sodium nitrate added in excess. The solution and precipitate are then boiled and any gold remaining in solution is precipitated by addition of oxalic acid if sodium nitrite was used for the first precipitation or by addition of sodium oxalate or an alkali if oxalic acid was used. The pH of the solution should be between 6 and 7 at this point. The liquid is then decanted off and the precipitate washed in water, heated to between 150 and 250 DEG C. in commercial sulphuric acid, repeatedly boiled and washed with distilled water, and dried below 100 DEG C. The treatment of gold precipitated by formaldehyde, formic acid or hydrogen peroxide is also referred to. Specification 380,324 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB33593/33A GB432881A (en) | 1933-11-30 | 1933-11-30 | Improvements in and relating to dental gold fillings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB33593/33A GB432881A (en) | 1933-11-30 | 1933-11-30 | Improvements in and relating to dental gold fillings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB432881A true GB432881A (en) | 1935-07-30 |
Family
ID=10354919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33593/33A Expired GB432881A (en) | 1933-11-30 | 1933-11-30 | Improvements in and relating to dental gold fillings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB432881A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3856507A (en) * | 1973-03-12 | 1974-12-24 | Owens Illinois Inc | Recovery of gold from solution in aqua regia |
| US5516355A (en) * | 1991-11-13 | 1996-05-14 | Radhakrishnan; Subramaniam | Method of preparation of compositions for an amalgam |
-
1933
- 1933-11-30 GB GB33593/33A patent/GB432881A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3856507A (en) * | 1973-03-12 | 1974-12-24 | Owens Illinois Inc | Recovery of gold from solution in aqua regia |
| US5516355A (en) * | 1991-11-13 | 1996-05-14 | Radhakrishnan; Subramaniam | Method of preparation of compositions for an amalgam |
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