US1152964A - Manufacture of dental models. - Google Patents

Manufacture of dental models. Download PDF

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Publication number
US1152964A
US1152964A US79564213A US1913795642A US1152964A US 1152964 A US1152964 A US 1152964A US 79564213 A US79564213 A US 79564213A US 1913795642 A US1913795642 A US 1913795642A US 1152964 A US1152964 A US 1152964A
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United States
Prior art keywords
plaster
model
paris
manufacture
impression
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Expired - Lifetime
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US79564213A
Inventor
Wilhelm Nielsen
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Individual
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Individual
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Priority to US79564213A priority Critical patent/US1152964A/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00—Dental prostheses; Making same
    • A61C13/0003—Making bridge-work, inlays, implants or the like

Definitions

  • This invention relates'to the manufacture of models for dental purposesfrom plaster of Paris.
  • the object of the present invention is to obviate the foregoing disadvantages and to enable the negative impression to be easlly and ,accurately detached from the positive ohanical work.
  • composition which consists of plaster of Paris to which potato flour or an equivalent substance has been added in such proportion, preferably in the proportion of 4 parts of plaster of Paris to about 1 art of potato flour, that the composition, when mixed with water or the like, forms a paste adapted to receive the impression and capable of hardening rapidly and which when dry forms a firm impression, but which is asily disintegrated in hot or boiling water or the like.
  • Thepositive 'model is obtained in the usual manner from the-ordinary plaster of Paris which is insoluble on hardening and is obtained by pouring ordinary plaster of Paris over the negative impression which is preferably covered with water glass to separate it from the model.
  • the model is then obtained by immersing the whole in boiling water so that the negative impression detaches itself completely from the model in a few minutes and leaves a clean model which can be immediately used in the further It will thus be seen that this method has the advantage that no tool or mechanical appliance is necessary to remove the negative impression.
  • this method may also be employed when necessary to produce negative .models from positive im ressions in which case the materials would e interchanged.
  • a dental model which consists in obtaining a negative impression in a composition consisting of plaster of Paris and an additional agent and which composition on hardening is adapted to disintegrate in a hot liquid, ob-

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  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Instructional Devices (AREA)

Description

UNIT D STATES PATENT oEFIoE.
.WILHELM NIELSEN, or BIELEFE'LD, GERMANY.
I mannmcrunn or DENTAL MonnLs.
No Drawing.
To all whom it may concern:
, Be it known that I, WILHELM NIELSEN,
a subject of the King of Denmark, residing at 7 Liitzowstrasse, Bielefeld, Germany,
have invented certain new and useful Imrovements in the Manufacture of Dental Klodels, of which the following is a specification.
This invention relates'to the manufacture of models for dental purposesfrom plaster of Paris.
As is well known it is usual in dental practice to take an impression of the interior of the mouth in plaster of Paris when accurate work is required as for example hen making bridges and the like. The de tal compositions which have hitherto been specially prepared for this purpose have been found unsuitable for accurate work owing to their liability to distortion and for this reason it is necessary to employ plaster of Paris. As is well known the impression or negative thusobtained is employed for obtaining a positive plaster of Paris model whichis used in the further manufacture of theartificial denture or parts thereof.
Hitherto it has. been usual to employ differently colored plaster of Paris for the model and the impression so that the model could be more easily distinguished from the.
I was very tedious.
The object of the present invention is to obviate the foregoing disadvantages and to enable the negative impression to be easlly and ,accurately detached from the positive ohanical work.
model without the use of special tools or me- According to the present invention the im Specification of Letters Patent.
, manufacture of the artificial denture.
Patented Sept. '7, 1915.
Application filed October 17, 1913. Serial No. 795,642.
f pression ofthe interior of the mouth is taken in a composition which consists of plaster of Paris to which potato flour or an equivalent substance has been added in such proportion, preferably in the proportion of 4 parts of plaster of Paris to about 1 art of potato flour, that the composition, when mixed with water or the like, forms a paste adapted to receive the impression and capable of hardening rapidly and which when dry forms a firm impression, but which is asily disintegrated in hot or boiling water or the like.
Thepositive 'model is obtained in the usual manner from the-ordinary plaster of Paris which is insoluble on hardening and is obtained by pouring ordinary plaster of Paris over the negative impression which is preferably covered with water glass to separate it from the model. The model is then obtained by immersing the whole in boiling water so that the negative impression detaches itself completely from the model in a few minutes and leaves a clean model which can be immediately used in the further It will thus be seen that this method has the advantage that no tool or mechanical appliance is necessary to remove the negative impression. Of course this method may also be employed when necessary to produce negative .models from positive im ressions in which case the materials would e interchanged.
I claim: 1
1. The method of obtaining a dental model which consists in obtaining a negative impression in a composition consisting of plaster of Paris and an additional agent and which composition on hardening is adapted to disintegrate in a hot liquid, ob-
taining a positive model therefrom in plaster of Paris anddetaching the negative impression from the-positive model by immersing the negative impression in a hot liquid. L 5
2. The method of "bta-ining a dental model which consists in obtaining a negative impression in a composition consisting of plaster of Parisand potato flour, obtaining a positive model therefrom in plaster of Paris and detaching the negative impression from the positive model by immersing the negative impression in a hot liquid.
3. The method of obtaining a dental model which consists in obtaining a negative impression in a composition consisting of about 4 parts of plaster of Paris to about 1 part of potato flour, obtaining a positive model therefrom in plaster of Paris and de- 7
US79564213A 1913-10-17 1913-10-17 Manufacture of dental models. Expired - Lifetime US1152964A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US79564213A US1152964A (en) 1913-10-17 1913-10-17 Manufacture of dental models.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US79564213A US1152964A (en) 1913-10-17 1913-10-17 Manufacture of dental models.

Publications (1)

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US1152964A true US1152964A (en) 1915-09-07

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US79564213A Expired - Lifetime US1152964A (en) 1913-10-17 1913-10-17 Manufacture of dental models.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446404A (en) * 1943-09-23 1948-08-03 Basescu Arthur Mold form
US2566596A (en) * 1948-01-15 1951-09-04 Jacob J Cantor Method of preparing dental investments and the like
US3057078A (en) * 1959-12-15 1962-10-09 Nu Dent Porcelain Studio Inc Apparatus for curing moist dental restoration molds
US20070122592A1 (en) * 2005-02-16 2007-05-31 Dentsply Research And Development Corp. Thermoforming plastic type II

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2446404A (en) * 1943-09-23 1948-08-03 Basescu Arthur Mold form
US2566596A (en) * 1948-01-15 1951-09-04 Jacob J Cantor Method of preparing dental investments and the like
US3057078A (en) * 1959-12-15 1962-10-09 Nu Dent Porcelain Studio Inc Apparatus for curing moist dental restoration molds
US20070122592A1 (en) * 2005-02-16 2007-05-31 Dentsply Research And Development Corp. Thermoforming plastic type II

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