US4678436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color-changeable cement composition for dental use
Assignee: GC Corp
•
Filing: 1986-04-29
•
Granted: 1987-07-07
•
Expires: 2006-04-29
Abstract
Abstract A color-changeable cement composition for dental use is disclosed, which comprises a first component comprising a metal oxide as a major ingredient, and a second component which can react with the first component to form a set body, wherein the composition contains a substance which changes its color tone with the change in pH so that the color tone of the cement composition can change upon intital setting of the cement composition. The composition enables one to visually observe the degree of setting of the cement composition.
Inventors
- 👤 Kenji Kondo
- 👤 Shigeru Katsuyama
- 👤 Shoji Akahane
- 👤 Kentaro Tomioka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:32
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/849; A61K6/864; A61K6/30; A61K6/884; A61K6/887; A61K6/889
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
66 words
A color-changeable cement composition for dental use comprising a first component comprising a metal oxide as a major ingredient, and a second component which reacts with the first component to form a set body, wherein said composition contains a substance which changes its color tone with the change in pH so that the color tone of said composition changes upon initial setting of said cement composition.
Claim 2
Dependent Claim
66 words
A color-changeable cement composition for dental use comprising a first component comprising a metal oxide as a major ingredient, and a second component which reacts with the first component to form a set body, wherein said composition contains a substance which changes its color tone with the change in pH so that the color tone of said composition changes upon initial setting of said cement composition.
Claim 3
Dependent Claim
39 words
The color-changeable cement composition as claimed in claim 1, wherein said dental cement composition contains a dental cement selected from the group consisting of dental zinc phosphate cement, dental polycarboxylate cement, dental glass ionomer cement, dental zinc oxide-eugenol cement.
Claim 4
Dependent Claim
43 words
The color-changeable cement composition as claimed in claim 1, wherein said substance which changes its color tone with the change in pH is present in an amount of 0.0001 to 0.5% by weight based on the total weight of said color-changeable cement composition.
Claim 5
Dependent Claim
43 words
The color-changeable cement composition as claimed in claim 2, wherein said substance which changes its color tone with the change in pH is present in an amount of 0.0001 to 0.5% by weight based on the total weight of said color-changeable cement composition.
Claim 6
Dependent Claim
26 words
The color-changeable cement composition as claimed in claim 1, wherein said substance which changes its color tone with the change in pH is a pH indicator.
Claim 7
Dependent Claim
24 words
The color-changeable cement composition as claimed in claim 5, wherein said pH indicator has a discoloring characteristic at a pH of 7 or less.
Claim 8
Dependent Claim
29 words
The color-changeable cement composition as claimed in claim 5, wherein said pH indicator is selected from the group consisting of meta-cresol purple, cresol red; thymol blue and ethyl orange.
References Cited (Backward Citations)
US4526544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-06 | 1991-01-05 | 1991-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-06 | 1995-01-05 | 1995-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-06 | 1999-01-05 | 1999-07-07 | $7700.00 | Window Closed / Lapsed |