Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
1999-06-11
2002-07-02
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S070000, C428S076000, C428S697000, C428S702000, C433S218000, C433S212100, C433S222100
Reexamination Certificate
active
06413660
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to dental restorations and more specifically to bonding layers for ceramic components used in dental restorations and methods of making thereof. The invention is also directed to high strength ceramic components embedded in composite materials for use as dental materials.
BACKGROUND OF THE INVENTION
Strength and reliability are important factors to consider when manufacturing dental restorations. Dental restorations must be able to withstand the normal mastication forces and stresses that exist within an oral environment. Different stresses are observed during mastication of different types of food, which can be experimentally measured by placing, for example, a strain gauge in inlays on the tooth. Stresses differ depending not only on the type of food, but also on the individual. For example, stress values may range from 570 to 2300 lb/inch
2
for a single chewing thrust on a piece of meat and from 950 to 2400 lb/inch
2
for a single thrust on a biscuit. The physical properties of dental restorations must be adequate to withstand the stresses applied by the repetitive forces of mastication.
Ceramic materials have proven to be reliable in the fabrication of single unit dental restorations. U.S. Pat. No. 4,798,536 to Katz and an article by Kabbert and Knode entitled “Inceram: Testing a New Ceramic Material”, Vol.4, pp 87-97(1993) each disclose ceramic compositions having leucite therein to provide strength and reliability to dental restorations. The strength of the materials is in the area of 170 MPa which is much higher than that of conventional porcelain which exhibits strengths of about 70 MPa. Nevertheless, the strength a nd/or toughness values of the aforementioned ceramic materials may not be adequate for the fabrication of multiple unit restorations.
There is a need to provide high strength, ceramic restorations having structural integrity and reliability and optimum bonding properties. It is desirable to produce high strength ceramic restorations which are compatible with a wide range of cost-effective polymeric based dental materials.
SUMMARY OF THE INVENTION
These and other objects and advantages are accomplished by the composition and method of manufacture of the present invention directed to high strength ceramic components for use in dental applications. In accordance with one embodiment herein, a bonding layer is disposed on a ceramic component to increase the bonding properties of the ceramic component in order that the ceramic component may better bond to a resin material, ceramic material or composite material. Moreover, the bonding layer provides strength to the ceramic component by forming a compressive layer thereon.
In accordance with another embodiment herein, a ceramic component is partially or fully embedded or encapsulated in composite material. The ceramic component is bonded to the composite material either by mechanical means, chemical means or both. The composite material may be placed directly on the ceramic component. Alternatively, the structural component is coated with a bonding layer to provide adhesion between the composite or like material and the structural component.
In accordance with yet another embodiment herein, silicon dioxide is deposited on the surface of the structural component in the form of colloidal silica, silane, tetra ethyl orthosilicate, or a similar silica precursor and heat treated to form a bonding layer which bonds the structural component to a resin, ceramic or composite material.
The resultant structural component is useful in the fabrication of dental appliances and restorations such as orthodontic retainers, bridges, space maintainers, tooth replacement appliances and splints.
REFERENCES:
patent: 3066112 (1962-11-01), Bowen
patent: 3179623 (1965-04-01), Bowen
patent: 3194784 (1965-07-01), Bowen
patent: 3423829 (1969-01-01), Halpern
patent: 3488847 (1970-01-01), Pettrow
patent: 3751399 (1973-08-01), Lee
patent: 3926906 (1975-12-01), Lee
patent: 4028325 (1977-06-01), King
patent: 4364731 (1982-12-01), Norling
patent: 4475892 (1984-10-01), Faunce
patent: 4544359 (1985-10-01), Waknine
patent: 4547531 (1985-10-01), Waknine
patent: 4595598 (1986-06-01), De Luca
patent: 4652459 (1987-03-01), Engelhardt
patent: 4681538 (1987-07-01), Deluca
patent: 4684555 (1987-08-01), Neumeyer
patent: 4717341 (1988-01-01), Goldberg
patent: 4737411 (1988-04-01), Graves
patent: 4741699 (1988-05-01), Kosmos
patent: 4798536 (1989-01-01), Katz
patent: 4820545 (1989-04-01), Negrych
patent: 4826430 (1989-05-01), Chen
patent: 4894012 (1990-01-01), Goldberg
patent: 4895516 (1990-01-01), Hulten
patent: 4948366 (1990-08-01), Horn
patent: 4983182 (1991-01-01), Kijima
patent: 4988362 (1991-01-01), Toriyama
patent: 5024711 (1991-06-01), Gasser
patent: 5077079 (1991-12-01), Kawamura
patent: 5118296 (1992-06-01), Eldred
patent: 5217375 (1993-06-01), Oden et al.
patent: 5276068 (1994-01-01), Waknine
patent: 5342201 (1994-08-01), Oden
patent: 5346717 (1994-09-01), McCrory
patent: 5444104 (1995-08-01), Waknine
patent: 5525385 (1996-06-01), Weinstein
patent: 5591030 (1997-01-01), Thiel et al.
patent: 5614330 (1997-03-01), Panzera
patent: 5676997 (1997-10-01), Okuyama
patent: 5707231 (1998-01-01), Watt
patent: 5711492 (1998-01-01), Cheladze
patent: 5788498 (1998-08-01), Wohlwend
patent: 5849068 (1998-12-01), Hofmann et al.
patent: 6001896 (1999-12-01), Ueno
patent: 6001897 (1999-12-01), Dickens
patent: 6013694 (2000-01-01), Jia
patent: 6120591 (2000-09-01), Brodkin
Kappert, H.F., Knode, H., In-Ceram: Testing a new ceramic material, Quintessence Dental Technology, vol. 16, 87-97, 1993.
Webster's II New College Dictionary, p. 366-367, (Boston, New York 1995) no month.
Brodkin Dmitri
Daskalon Gregg
Karmaker Ajit
Panzera Carlino
Panzera Paul
Jeneric/Pentron Inc.
Jones Deborah
Knab, Esq. Ann M.
McNeil Jennifer
LandOfFree
High-strength dental restorations does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High-strength dental restorations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High-strength dental restorations will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2899977