US3755902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tool for removing an orthodontic onlay that has been cemented to the front surface of a tooth
Assignee: Individual
•
Filing: 1972-07-31
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Granted: 1973-09-04
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Expires: 1992-07-31
Abstract
Abstract A tool for removing an orthodontic onlay or bracket from a tooth to which it has been cemented. The tool comprises pliers, having a pair of pivoted jaws and handles. One of the jaws has a raised pad having a resilient surface that is placed against the edge of the tooth, and the other jaw has a hard metal insert shaped to provide a chisel portion with a sharp edge for getting in between the tooth and the onlay. When the handles are forced together, the jaws move toward each other and the chisel portion separates the onlay or bracket from the tooth.
Inventors
- 👤 M Northcutt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:21
CPC Classifications
A; A61; A61C; A61C3/00; A61C3/16; A61C3/162; A61C7/00; A61C7/02; A61C7/023; Y; Y10; Y10T; Y10T156/00; Y10T156/19; Y10T156/1961; Y10T156/1967; Y10T156/1972
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A tool for removing an orthodontic onlay that has been cemented to the front surface of a tooth, comprising pliers having a pair of pivoted jaws and a pair of handles, a first said jaw terminating in a resilient pad, and a second said jaw terminating in a hard chisel portion with a sharp flat edge approximately the width of an onlay projecting toward said pad and resting against said pad when said jaws are closed together, whereby said pliers during use are positioned with said first jaw having its pad seated on the biting edge of said tooth and with said second jaw against the surface of said tooth and said sharp edge is moved toward said pad in between said onlay and said tooth to cleave said onlay from said tooth along the cement-tooth interface.
Claim 2
Dependent Claim
137 words
A tool for removing an orthodontic onlay that has been cemented to the front surface of a tooth, comprising pliers having a pair of pivoted jaws and a pair of handles, a first said jaw terminating in a resilient pad, and a second said jaw terminating in a hard chisel portion with a sharp flat edge approximately the width of an onlay projecting toward said pad and resting against said pad when said jaws are closed together, whereby said pliers during use are positioned with said first jaw having its pad seated on the biting edge of said tooth and with said second jaw against the surface of said tooth and said sharp edge is moved toward said pad in between said onlay and said tooth to cleave said onlay from said tooth along the cement-tooth interface.
Claim 3
Dependent Claim
21 words
The tool of claim 1 having spring means anchored to said handles for spring loading said handles away from each other.
Claim 4
Dependent Claim
32 words
The tool of claim 1 wherein facing inner surfaces of said handles have posts projecting therefrom and a coil spring anchored at said posts and urging said handles apart from each other.
Claim 5
Dependent Claim
149 words
A tool for removing an orthodontic onlay that has been cemented to the front surface of a tooth, comprising pliers having a pair of pivoted jaws and a pair of handles, a first said jaw terminating in a resilient pad, and a second said jaw terminating in a hard chisel portion with a sharp edge that approximates the curve of the front surface of a tooth and is approximately the width of the onlay projecting toward said pad and resting agaInst said pad when said jaws are closed together, whereby said pliers during use are positioned with said first jaw having its pad seated on the biting edge of said tooth and with said second jaw against the surface of said tooth and said sharp edge is moved toward said pad in between said onlay and said tooth to cleave said onlay from said tooth along the cement-tooth interface.
Claim 6
Dependent Claim
149 words
A tool for removing an orthodontic onlay that has been cemented to the front surface of a tooth, comprising pliers having a pair of pivoted jaws and a pair of handles, a first said jaw terminating in a resilient pad, and a second said jaw terminating in a hard chisel portion with a sharp edge that approximates the curve of the front surface of a tooth and is approximately the width of the onlay projecting toward said pad and resting agaInst said pad when said jaws are closed together, whereby said pliers during use are positioned with said first jaw having its pad seated on the biting edge of said tooth and with said second jaw against the surface of said tooth and said sharp edge is moved toward said pad in between said onlay and said tooth to cleave said onlay from said tooth along the cement-tooth interface.
References Cited (Backward Citations)
US701616A
Cited
US2985962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |