US4824366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for removal of objects glued onto dental enamel, in particular brackets
Assignee: SCHEU DENTAL INHABER RUDOLF SCHEU
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Filing: 1986-08-30
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Granted: 1989-04-25
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Expires: 2006-08-30
Abstract
Abstract A control of the adhesive layer is to be achieved with a process and a device for removal of brackets or other metallic dental objects serving for orthodontic treatment which have been glued onto dental enamel wherein the layer of glue between the bracket or the object and the dental enamel is to be reduced in its adhesiveness by heating, wherein the tooth of the patient is effectively protected in such a way that a heating of the tooth itself cannot even occur. This is achieved in that the heating is performed by direct electrical resistance heating.
Inventors
- 👤 Wolfgang Hohmann
- 👤 Peter-Michael Schopf
- 👤 Klaus Gerkhardt
- 👤 Bogdan Kocjancic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:38
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/02; A61C7/023
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
Device for safe removal of brackets or like metallic dental objects glued to dental enamel and serving for orthodontic treatment by heating the glued objects by direct electric resistance heating, said device comprising: a forceps- or tweezer-like gripping instrument with two forceps-like gripping legs electrically insulated from each other and whose ends are configured to directly grip the glued object to establish a low resistance series circuit of the gripping legs and object and capable when the glue weakens to remove the bracket, a source of low voltage, high current pulses having a short time interval, and means for connecting the pulse source to the gripping legs, the current pulses having characteristics such that application of such a pulse to the gripped object will by direct electric resistance heating of the object sufficiently raise the temperature of the glue so that the glue becomes weakened and thus allows the instrument to readily remove the gripped object without over-heating the dental enamel.
Claim 2
Dependent Claim
161 words
Device for safe removal of brackets or like metallic dental objects glued to dental enamel and serving for orthodontic treatment by heating the glued objects by direct electric resistance heating, said device comprising: a forceps- or tweezer-like gripping instrument with two forceps-like gripping legs electrically insulated from each other and whose ends are configured to directly grip the glued object to establish a low resistance series circuit of the gripping legs and object and capable when the glue weakens to remove the bracket, a source of low voltage, high current pulses having a short time interval, and means for connecting the pulse source to the gripping legs, the current pulses having characteristics such that application of such a pulse to the gripped object will by direct electric resistance heating of the object sufficiently raise the temperature of the glue so that the glue becomes weakened and thus allows the instrument to readily remove the gripped object without over-heating the dental enamel.
Claim 3
Dependent Claim
38 words
Device as claimed in claim 1, wherein the pulse source includes a protective circuit for applying the pulse to the instrument only after the low resistance series circuit between the gripping legs and the object has been established.
Claim 4
Dependent Claim
25 words
Device as claimed in claim 1 or 2, wherein the pulse source comprises a battery in a charging circuit for producing the high current pulse.
Claim 5
Dependent Claim
23 words
Device as claimed in claim 1, wherein the gripping leg ends have at least partially replaceable gripping ends configured for gripping the object.
Claim 6
Dependent Claim
25 words
Device as claimed in claim 1 or 2, wherein the pulse source comprises means for indicating when the low resistance series circuit has been established.
References Cited (Backward Citations)
FR2177047A1
Cited
US3924332A
Cited
US4034762A
Cited
SU719821A1
Cited
US4441013A
Cited
US4375961A
Cited
US4553021A
Cited
US4455138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |