Dental porcelain

Details Dental porcelain Dental porcelain

1999-05-28

2001-02-13

Koslow, C. Melissa (Department: 1755)

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

C501S017000, C501S021000, C501S066000, C501S068000, C501S069000, C106S035000

Reexamination Certificate

active

06187701

ABSTRACT:

The present invention relates to a dental porcelain. More specifically, the present invention relates to a dental porcelain capable of being used for a ceramics core having a low thermal expansion coefficient.
In odontotherapy, especially for aesthetic tooth restorations, dental prostheses, such as an artificial tooth, inlays, onlays, bridges and crowns, which use dental porcelains have been used. There are two types of dental prostheses. One type is a metal-reinforced dental prosthesis which is produced by firing a porcelain called a metal bond porcelain on a metal core; the other type is a full ceramics (synonymous with all ceramics) dental prosthesis which is produced by firing a porcelain on a ceramic core.
The metal-reinforced dental prosthesis has been widely used because it has a high strength. Further, ceramics which contain crystalline components, e.g. orthoclase (KAISi
3
O
8
), albite (NaAISi
3
O
8
) and the like are widely used as metal bond porcelains. However, two serious problems are caused when they are used. That is, one problem is that gum discolors due to elution of metal ions, and the other is that the metal in the inside (metal core) shuts off light and therefore natural translucent feeling can not be obtained.
In contrast with this, when the full ceramics dental prostheses are used, such serious problems shall not take place. Then, in the field of dental prostheses, especially in the field of dental porcelain crowns where aesthetic aspect is very important new ceramic materials having an excellent strength have been developed, and therefore the importance of the full ceramics prostheses has been increasing.
In general, a dental porcelain crown is produced by using porcelains having color tones which correspond to those of the respective parts of the crown for the respective parts thereof in order to obtain appearance close to that of a natural tooth.


REFERENCES:
patent: 4120729 (1978-10-01), Smyth et al.
patent: 5304516 (1994-04-01), Clifford
patent: 5614330 (1997-03-01), Panzera et al.

Affiliated with

Also associated with

Rating

Dental porcelain does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Dental porcelain, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dental porcelain will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2590949