Patent US4253835A successfully refreshed from Google Patents.
US4253835A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Post and sleeve arrangement
Assignee: Individual
•
Filing: 1979-10-01
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Granted: 1981-03-03
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Expires: 1999-10-01
Abstract
Abstract Disclosed is a dental arrangement and method for restoring broken teeth which require a crown and a retention post for securing the crown in a post hole formed in the tooth. The post hole is dimensioned to receive a first sleeve, which in turn is dimensioned to receive the retention post. By using the sleeve for confirming a desirable post hole size, and for centering the retention post during the making of the impression, a sufficient margin of error is built into the space between the post hole and the retention post to allow the placement of cement. A wax sealed second sleeve, with a short post therein, is used in making a die of the tooth.
Inventors
- 👤 Ormond H. Ware
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:43
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/225; A61C13/30
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
53 words
A method for making an impression of a broken tooth, the impression to be used to create a die to form a crown for the broken tooth, said method comprising the steps of: drilling a post hole into the broken tooth for a retention post; positioning a first sleeve around the retention post;
Claim 2
Independent Claim
53 words
A method for making an impression of a broken tooth, the impression to be used to create a die to form a crown for the broken tooth, said method comprising the steps of: drilling a post hole into the broken tooth for a retention post; positioning a first sleeve around the retention post;
Claim 3
Dependent Claim
119 words
slidingly inserting the retention post and the first sleeve into the post hole so that the retention post extends beyond the top of the broken tooth; making an impression of the top of the broken tooth with the retention post and the sleeve inserted in the post hole; removing the impression from the top of the broken tooth so that the retention post protrudes from the impression; removing the first sleeve from the post hole; whereby the use of the first sleeve centers the retention post during the making of the impression and, after the removal of the first sleeve, provides a predetermined spacial area between the retention post and the post hole for the placement of a cement.
Claim 4
Dependent Claim
119 words
slidingly inserting the retention post and the first sleeve into the post hole so that the retention post extends beyond the top of the broken tooth; making an impression of the top of the broken tooth with the retention post and the sleeve inserted in the post hole; removing the impression from the top of the broken tooth so that the retention post protrudes from the impression; removing the first sleeve from the post hole; whereby the use of the first sleeve centers the retention post during the making of the impression and, after the removal of the first sleeve, provides a predetermined spacial area between the retention post and the post hole for the placement of a cement.
Claim 5
Dependent Claim
48 words
The method of claim 1, further comprising, pouring a die stone over the impression and the retention post to form a die; waxing up a crown on the die and retention post; casting the crown; cementing the retention post, with the crown mounted thereon, in the post hole.
Claim 6
Dependent Claim
26 words
The method of claim 1, wherein said step of slidingly inserting the retention post further includes positioning the retention post to extend above the first sleeve.
Claim 7
Dependent Claim
62 words
The method of claim 3, providing a second sleeve which has a longer longitudinal dimension than the first sleeve; after making the impression, placing the second sleeve over the retention post which is protruding from the impression; next, positioning a relatively short post in the end of the second sleeve; next, positioning a wax seal over the end of the second sleeve.
Claim 8
Dependent Claim
49 words
The method of claim 4, after placement of the wax seal, pouring a die stone over the impression and the sealed second sleeve to provide a die having the shape of the tooth above the gum line and having the sealed second sleeve and the retention post disposed therein.
Claim 9
Dependent Claim
20 words
The method of claim 5, after forming a die, waxing up a core on the retention post for subsequent casting.
Claim 10
Dependent Claim
24 words
The method of claim 6, providing the retention post formed of a plastic material, casting the core and the retention post as one unit.
Claim 11
Dependent Claim
20 words
The method of claim 5, after forming the die, waxing up a crown on the retention post for subsequent casting.
Claim 12
Dependent Claim
24 words
The method of claim 8, providing the retention post formed of a plastic material; casting the retention post and a crown as one unit.
Claim 13
Dependent Claim
28 words
The method of claim 1, wherein said step of slidingly inserting the retention post and the first sleeve includes slidingly inserting the retention post into the first sleeve.
Claim 14
Independent Claim
117 words
A method for making a die from an impression of a broken tooth, the die being used to form a crown for the broken tooth, said method comprising the steps of: making an impression of the top of the broken tooth and inserting an end of a retention post therein; after making the impression, placing a sleeve over the retention post, which is protruding from the impression, so that the sleeve extends beyond the end of the retention post; next, positioning a relatively short post in the end of the sleeve, next, pouring a liquid material over the impression and the sleeve to form a die wherein the retention post can be slidingly removed from the sleeve.
Claim 15
Independent Claim
117 words
A method for making a die from an impression of a broken tooth, the die being used to form a crown for the broken tooth, said method comprising the steps of: making an impression of the top of the broken tooth and inserting an end of a retention post therein; after making the impression, placing a sleeve over the retention post, which is protruding from the impression, so that the sleeve extends beyond the end of the retention post; next, positioning a relatively short post in the end of the sleeve, next, pouring a liquid material over the impression and the sleeve to form a die wherein the retention post can be slidingly removed from the sleeve.
Claim 16
Dependent Claim
24 words
In the method of claim 11, placing a seal over the end of the sleeve before pouring the liquid material to make the die.
Claim 17
Dependent Claim
26 words
In the method of claim 12, removing the die and the sleeve embedded in the die from the impression; removing the impression from the retention post.
Claim 18
Dependent Claim
34 words
In the method of claim 13, after the steps of removing the impression from the die and the retention post, waxing up a core on the retention post and the die for subsequent casting.
Claim 19
Dependent Claim
34 words
In the method of claim 13, after the steps of removing the impression from the die and the retention post, waxing up a crown on the retention post and the die for subsequent casting.
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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) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |