Patent US3881252A successfully refreshed from Google Patents.
US3881252A
Expired / Lapsed
US
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Orthodontic bracket extraction
Assignee: Johnson and Johnson Dental Products Co
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Filing: 1973-07-31
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Granted: 1975-05-06
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Expires: 1993-07-31
Abstract
Abstract An orthodontic bracket technique for bodily tooth movement in which the orthodontic bracket has a groove recessed therein for the reception of an archwire, the bracket having its leading edge lower than its trailing edge with the groove geometry the same for creating an anti-rotation force as a tooth is moved bodily into a void, the anti-rotational force being of sufficient magnitude to cancel the rotational effect which occurs with use of conventional brackets. Optionally, an anti-tip angle can be put in the bracket grooves.
Inventors
- 👤 Lawrence F Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:25
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
An orthodontic bracket for bodily tooth movement cases comprising: a bracket having a groove recess therein for the reception of an archwIre, said bracket having a leading edge and a trailing edge relative to bodily tooth movement; and said leading edge being narrower than said trailing edge creating an angle between an installed archwire and a transverse axis of the tooth, said angle being substantially equal in degrees to the desired number of millimeters of tooth movement.
Claim 2
Dependent Claim
77 words
An orthodontic bracket for bodily tooth movement cases comprising: a bracket having a groove recess therein for the reception of an archwIre, said bracket having a leading edge and a trailing edge relative to bodily tooth movement; and said leading edge being narrower than said trailing edge creating an angle between an installed archwire and a transverse axis of the tooth, said angle being substantially equal in degrees to the desired number of millimeters of tooth movement.
Claim 3
Dependent Claim
33 words
The orthodontic bracket for extraction cases of claim 1 wherein: said groove is angled a predetermined amount in a vertical plane for cancelling any tendency of the tooth to tip during bodily movement.
Claim 4
Dependent Claim
25 words
The orthodontic bracket of claim 2 wherein: said vertical plane angle is substantially equal in degrees to the desired number of millimeters of tooth movement.
References Cited (Backward Citations)
US3504438A
Cited
US3660900A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |