US4238189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making in a single operation a base and dental model including a tooth die with an integral bayonet type mounting pin
Assignee: Individual
•
Filing: 1979-07-30
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Granted: 1980-12-09
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Expires: 1999-07-30
Abstract
Abstract A method for producing in a single casting operation a dental model including a unitary tooth die which incorporates an integral mounting pin. The pin and die form a part of, and are removable from the dental model. Prior to casting the die, a bayonet shaped mounting pin is held in position by a permanent divider which, in turn, is supported in a negative impression of a denture. The die and base are then cast simultaneously, eliminating the need for the more commonly used double casting procedure.
Inventors
- 👤 Angelo C. Tirino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:42
CPC Classifications
A; A61; A61C; A61C9/00; A61C9/002
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
322 words
A method for forming a unitary tooth die and mounting pin integral with and removable from a dental model and base, comprising the steps of: (a) providing a negative dental model including the selected tooth to be reproduced, (b) providing a planar divider with a width and breadth sufficient to cover the area in the model over a cavity of a selected tooth to be reproduced, said divider having a central opening generally in the shape of a rectangle, (c) providing a generally flat bayonet-shaped pin comprising: 1. a lower tip having a width less than that of the mouth of said opening to facilitate insertion of said pin in said opening, 2. an upper portion with a width greater than that of the tip and having generally parallel sides, said upper portion having a cross section generally corresponding to the opening in said divider, 3. a central portion tapering from the tip to the wider upper portion, and 4. a top portion having a cross member to anchor said pin in said die, (d) inserting said pin up to the center of its upper portion into the divider through said opening in the divider, (e) positioning the divider with the pin inserted in the divider opening over and in alignment with the cavity in the model of the selected tooth to be reproduced, said divider being oriented to place the pin cross member in the cavity of the selected tooth, (f) pouring a dental molding material into the negative impression, about the pin, about the cross member of said pin and the divider to form the die of the tooth to be reproduced and the base in a single pour, (g) allowing the molding material to harden, and (h) relieving the model through the base portion on either side of the pin about the width of the tooth to be reproduced down to the divider to permit removal of the die.
Claim 2
Independent Claim
322 words
A method for forming a unitary tooth die and mounting pin integral with and removable from a dental model and base, comprising the steps of: (a) providing a negative dental model including the selected tooth to be reproduced, (b) providing a planar divider with a width and breadth sufficient to cover the area in the model over a cavity of a selected tooth to be reproduced, said divider having a central opening generally in the shape of a rectangle, (c) providing a generally flat bayonet-shaped pin comprising: 1. a lower tip having a width less than that of the mouth of said opening to facilitate insertion of said pin in said opening, 2. an upper portion with a width greater than that of the tip and having generally parallel sides, said upper portion having a cross section generally corresponding to the opening in said divider, 3. a central portion tapering from the tip to the wider upper portion, and 4. a top portion having a cross member to anchor said pin in said die, (d) inserting said pin up to the center of its upper portion into the divider through said opening in the divider, (e) positioning the divider with the pin inserted in the divider opening over and in alignment with the cavity in the model of the selected tooth to be reproduced, said divider being oriented to place the pin cross member in the cavity of the selected tooth, (f) pouring a dental molding material into the negative impression, about the pin, about the cross member of said pin and the divider to form the die of the tooth to be reproduced and the base in a single pour, (g) allowing the molding material to harden, and (h) relieving the model through the base portion on either side of the pin about the width of the tooth to be reproduced down to the divider to permit removal of the die.
Claim 3
Dependent Claim
123 words
An assembly for prosthetic dentistry comprising: (a) a base, said base being formed with an opening contoured to accept a bayonet-shaped pin, (b) a model secured to said base, (c) a die in said model removably attached to said base, (d) a generally flat, bayonet-shaped pin anchored in said die comprising: 1. a lower tip having a width less than that of the mouth of said opening to facilitate insertion of said pin in said opening, 2. an upper portion with a width greater than that of the tip and having generally parallel sides, 3. a central portion tapering from the tip to the wider upper portion, and 4. a top portion having a cross member to anchor said pin in said die.
Claim 4
Dependent Claim
123 words
An assembly for prosthetic dentistry comprising: (a) a base, said base being formed with an opening contoured to accept a bayonet-shaped pin, (b) a model secured to said base, (c) a die in said model removably attached to said base, (d) a generally flat, bayonet-shaped pin anchored in said die comprising: 1. a lower tip having a width less than that of the mouth of said opening to facilitate insertion of said pin in said opening, 2. an upper portion with a width greater than that of the tip and having generally parallel sides, 3. a central portion tapering from the tip to the wider upper portion, and 4. a top portion having a cross member to anchor said pin in said die.
Claim 5
Dependent Claim
64 words
An assembly as claimed in claim 2, further comprising a generally planar divider positioned between the die and the base prior to forming the die and base to separate the two, when formed, said divider containing a centrally located opening essentially identical in cross section to the opening in said base and positioned to lie over and coincide with said opening in the base.
Claim 6
Dependent Claim
76 words
An assembly as claimed in claim 3, wherein said divider is comprised of material having a surface which essentially does not adhere to the material forming said die and base, said divider including a portion with an enlarged end projecting into the base to anchor the divider into the base and said divider including a ridge on the surface contacting the die to serve as a key to align the die with respect to the base.
Claim 7
Dependent Claim
27 words
An assembly as claimed in claim 4, wherein said ridge is triangular in cross section to facilitate repositioning the die on said ridge and divider after removal.
Claim 8
Dependent Claim
36 words
An assembly as claimed in claim 3, wherein said ridge is triangular in cross section, one end of said ridge being wider than the opposite end to provide for fore and aft alignment of the die.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |