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US4359455A
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Diagnostic test composition for dental caries activity
Assignee: Sunstar Inc
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Filing: 1979-10-30
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Granted: 1982-11-16
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Expires: 1999-10-30
Abstract
Abstract A test composition for evaluating dental caries activity, which comprise a specific amount of a saccharide (e.g. sucrose, glucose and fructose) and a pH indicator (e.g. resazurin, lacmoid, methyl red and alizarin) in water or an aqueous alcohol solution, said composition being regulated to a pH range of 6.5 to 7.0 with an alkali (e.g. sodium hydroxide) and an acid (e.g. acetic acid, tartaric acid or lactic acid). By using this test composition, a test for evaluation dental caries activity can be done within a very short period of time (e.g. about 30 minutes) by any person without requesting any specific training.
Inventors
- 👤 Masakazu Nakamura
- 👤 Kikuko Hamato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:19
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
109 words
A method for determining dental caries activity which comprises collecting a sample of dental plaque, mixing the collected plaque with a composition consisting essentially of 2.5 to 40% by weight of a saccharide selected from the group consisting of sucrose, glucose and fructose, 0.0001 to 0.05% by weight of a pH indicator selected from the group consisting of resazurin, lacmoid, methyl red and alizarin, and remainder of a medium selected from the group consisting of water and an aqueous alcohol solution, said composition having a pH range of 6.5 to 7, and after a predetermined period of time, observing any color change of the mixture to evaluate acid production.
Claim 2
Independent Claim
109 words
A method for determining dental caries activity which comprises collecting a sample of dental plaque, mixing the collected plaque with a composition consisting essentially of 2.5 to 40% by weight of a saccharide selected from the group consisting of sucrose, glucose and fructose, 0.0001 to 0.05% by weight of a pH indicator selected from the group consisting of resazurin, lacmoid, methyl red and alizarin, and remainder of a medium selected from the group consisting of water and an aqueous alcohol solution, said composition having a pH range of 6.5 to 7, and after a predetermined period of time, observing any color change of the mixture to evaluate acid production.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein the said pH indicator is resazurin or lacmoid.
References Cited (Backward Citations)
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US3332743A
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US3507269A
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US3584112A
Cited
US3746624A
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US4133875A
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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) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |