Patent US4802950A successfully refreshed from Google Patents.
US4802950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enamel-bonding etchant and procedure
Assignee: Individual
•
Filing: 1988-04-12
•
Granted: 1989-02-07
•
Expires: 2008-04-12
Abstract
Abstract A gel-etchant for resin bonding in dentistry includes phosphoric acid, fumed silica, and silicon carbide particles. The silicon carbide adds an abrasive to the etchant gel which permits the combination of the preparatory cleansing step and the application step into one operation. The silicon carbide increases the weight of the gel which aids its rinsability and further functions to indicate the location of the acid gel on the tooth. A procedure for applying the gel etchant eliminates a preparatory cleansing step and includes applicator agitation against the tooth, combined with a shortened rinse time.
Inventors
- 👤 Theodore P. Croll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:03
CPC Classifications
C; C09; C09K; C09K13/00; C09K13/04; A; A61; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/40; A61K6/70; A61K6/78
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
An enamel-bonding etchant for use in dentistry, comprising; a. a quantity of phosphoric acid in the concentration range of 35% to 50%, b. a quantity of fumed silica sufficient to form a moist paste when mixed with said phosphoric acid, and c. abrasive particulate matter mixed with said phosphoric acid and silica.
Claim 2
Dependent Claim
52 words
An enamel-bonding etchant for use in dentistry, comprising; a. a quantity of phosphoric acid in the concentration range of 35% to 50%, b. a quantity of fumed silica sufficient to form a moist paste when mixed with said phosphoric acid, and c. abrasive particulate matter mixed with said phosphoric acid and silica.
Claim 3
Dependent Claim
26 words
The enamel-bonding etchant of claim 1, wherein said abrasive particles are dark in color to serve as a marking element for the location of said etchant.
Claim 4
Dependent Claim
13 words
The enamel-bonding etchant of claim 2, wherein said abrasive particles are silicon carbide.
Claim 5
Dependent Claim
24 words
The enamel-bonding etchant of claim 3, wherein said silicon carbide is mixed with said phosphoric acid and silica in the volumetric ratio of 10:1.
Claim 6
Dependent Claim
15 words
The enamel-bonding etchant of claim 4, wherein said silicon carbide particles are a 220-mesh grade.
Claim 7
Dependent Claim
62 words
A one-step tooth enamel-etching procedure for resin bonding in dentistry, comprising; a. application of an etchant compound comprising phosphoric acid, fumed silica and silicon carbide particles to the surface of a tooth, b. agitating said compound against the tooth with an applicator, c. rinsing said compound from the tooth for less than 15 seconds, and d. air-drying the surface of the tooth.
Claim 8
Dependent Claim
62 words
A one-step tooth enamel-etching procedure for resin bonding in dentistry, comprising; a. application of an etchant compound comprising phosphoric acid, fumed silica and silicon carbide particles to the surface of a tooth, b. agitating said compound against the tooth with an applicator, c. rinsing said compound from the tooth for less than 15 seconds, and d. air-drying the surface of the tooth.
References Cited (Backward Citations)
US4713145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |