Patent US4881552A successfully refreshed from Google Patents.
US4881552A
Expired / Lapsed
US
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Tooth stability monitor
Assignee: MEASUREMENT RESOURCES Inc
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Filing: 1988-01-20
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Granted: 1989-11-21
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Expires: 2008-01-20
Abstract
Abstract A tooth stability monitor for assessing the rigidity of a tooth. A tooth probe 11 is provided for sinusoidally moving the tooth at a constant small amplitude. A displacement sensor 13 measures the resulting displacement of the tooth and a force sensor 14 measures the resulting force applied to the tooth. Feedback electronics 15 receives the two measurements and calculates the tooth modulus.
Inventors
- 👤 Joseph S. Heyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:20
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/103; A61B5/11; A61B5/1111; A61C; A61C19/00; A61C19/04; A61B5/68; A61B5/6801; A61B5/6813; A61B5/6814; A61B5/682
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A tooth stability monitor comprising: means for sinusoidally moving the tooth under investigation at a small constant amplitude comprising a hand held tooth probe including a probe tip mounted in a probe mount for making contact with the tooth, a hand held probe body, and means for sinusoidally moving said probe mount relative to said hand held probe body; means for generating a first electrical signal representing the resulting displacement of the tooth; means for generating a second electrical signal representing the force applied to said tooth to produce the movement of the tooth; means for generating a third electrical signal proportional to vibrations of said hand held probe body; and means receiving said first, second and third electrical signals for modifying said first and second electrical signals to remove the effects of the hand held probe body vibrations, and for computing the tooth modulus using the modified first and second electrical signals.
Claim 2
Dependent Claim
153 words
A tooth stability monitor comprising: means for sinusoidally moving the tooth under investigation at a small constant amplitude comprising a hand held tooth probe including a probe tip mounted in a probe mount for making contact with the tooth, a hand held probe body, and means for sinusoidally moving said probe mount relative to said hand held probe body; means for generating a first electrical signal representing the resulting displacement of the tooth; means for generating a second electrical signal representing the force applied to said tooth to produce the movement of the tooth; means for generating a third electrical signal proportional to vibrations of said hand held probe body; and means receiving said first, second and third electrical signals for modifying said first and second electrical signals to remove the effects of the hand held probe body vibrations, and for computing the tooth modulus using the modified first and second electrical signals.
Claim 3
Dependent Claim
38 words
A tooth stability monitor according to claim 1 wherein said means for sinusoidally moving the tooth under investigation includes means for varying the amplitude and frequency of the movement whereby nonlinear modulus and phase angle can be determined.
Claim 4
Dependent Claim
46 words
A tooth stability monitor according to claim 1 wherein said means for sinusoidally moving said probe mount relative to said probe body includes a shaft mounted for movement inside said probe body and a constant amplitude driver for moving said shaft relative to said probe body.
Claim 5
Dependent Claim
30 words
A tooth stability monitor according to claim 3 wherein said shaft is attached to said probe mount for moving said probe mount and said tip relative to said probe body.
Claim 6
Dependent Claim
38 words
A tooth stability monitor according to claim 4 wherein said means for generating said first electrical signal is a linear variable differential transformer inside said probe body for generating a signal proportional to the movement of said shaft.
Claim 7
Dependent Claim
44 words
A tooth stability monitor according to claim 4 wherein said means for generating a second electrical signal is a transducer integral with said shaft for generating a signal proportional to the force exerted by said shaft through the probe mount tip to said tooth.
References Cited (Backward Citations)
SU205214A1
Cited
US3094115A
Cited
US3875420A
Cited
US3943913A
Cited
US4058115A
Cited
US4197641A
Cited
US4192321A
Cited
US4470810A
Cited
US4499906A
Cited
US4764114A
Cited
US4665621A
Cited
FR2733081A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-20 | 1993-05-22 | 1993-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-20 | 1997-05-22 | 1997-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-20 | 2001-05-22 | 2001-11-21 | $7700.00 | Window Closed / Lapsed |