Dentistry – Method or material for testing – treating – restoring – or... – By filling – bonding or cementing
Patent
1999-01-27
2000-12-12
Lewis, Ralph A.
Dentistry
Method or material for testing, treating, restoring, or...
By filling, bonding or cementing
433206, 1562722, C23C 1448, A61K 606
Patent
active
061590118
DESCRIPTION:
BRIEF SUMMARY
The invention relates to the production of a titanium-ceramic adhesive composite system and to a titanium-ceramic adhesive composite system produced thereby.
It is known to use titanium or titanium alloys as a material for industrial objects which need to have high strength and low weight. It is therefore used in the car industry and in air and space travel, e.g. for engines and power units. Titanium, particularly at elevated temperature in air, becomes coated with a firmly-adhering, hard, brittle oxide layer. The oxide layer due to oxygen diffusion makes it difficult to apply other substances to the titanium surface, particularly when producing a titanium-ceramic adhesive composite system. Owing to the low coefficient of thermal expansion of titanium, veneering titanium structures with ceramic materials results not only in crazing but also in large-area flaking of the ceramic layer.
The problem will now be discussed in greater detail with reference to the development in the area of the use of titanium-ceramic adhesive composite systems in dental technology.
It is known to replace expensive noble metal-containing alloys for dental prostheses by gold-reduced alloys, palladium-based alloys or alloys free from noble metals.
Owing to the increasing awareness of patients of the allergenic effects of dental materials and to the frequent allergic reactions of patients after incorporation of dental prostheses, the need to find a suitable material has been recognised. Non-alloyed titanium is a suitable material in this regard. It has given good results as a material in general medical use and also, in recent decades, in dental implants and surgery. Its most important properties include high biocompatability, low cost, and high availability owing to its frequency of occurrence.
Various material properties of titanium resulted in initial difficulties in processing for dental purposes, but these were overcome by suitable measures. Dental casting of titanium has become possible through development of special casting systems and suitable embedding materials. The ability to be veneered with ceramics, an important precondition for general use of a dental material, was achieved only after development of low-melting ceramic materials having a suitable thermal expansion coefficient. Subsequent clinical tests confirm in-vitro tests, in which the loss of adhesive strength was determined after cyclic changes in temperature load. The difficulty is increased by the fact that the initial adhesive strength of titanium-ceramic combinations in the various mechanical breaking tests was found to be lower than for conventional metal-ceramic systems.
The proportions of faulty ceramic titanium veneers found in the clinical tests was assumed to be due to the losses in adhesive strength measured in vitro as a result of changes in temperature load (MOORMANN, A.: Vergleichende Untersuchengen zue Verbundfestigkeit von neun Titan-Keramik-Verbundkombi-nationen in Abhangigkeit von den Lagerungsbedingungen, Med Diss, Berlin 1993).
After a usable process of titanium casting was developed, there was an increase in the range of applications of titanium in dentistry. It is used in prostheses and implants and also in endodontics as a dowel material and for trans-dental fixing. In orthopedic jaw therapy with fixed appliances and in conservative dentistry, titanium alloys are also used as a material for inlays, on-lays and, increasingly frequently, for part-crowns.
To meet aesthetic requirements, it is important for a dental prosthetic material to be capable of having a tooth-colour veneer. A reliable ceramic veneerability is an essential condition for universal use of a prosthetic material.
The main components of dental ceramic materials are:
Glassy feldspar serves as a flux and influences the transparency of the ceramic. Kaolin, like quartz, increases the strength of the ceramics, and quartz also increases the transparency.
During the firing process, the dental ceramic melts, when the added SiO.sub.2 and B.sub.2 O.sub.3 oxides form a glassy matrix in w
REFERENCES:
patent: 5534103 (1996-07-01), Yano et al.
Moormann Andreas
Wehnert Lothar
Dubno Herbert
Lewis Ralph A.
LandOfFree
Process for producing a titanium-ceramic adhesive composite syst does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for producing a titanium-ceramic adhesive composite syst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing a titanium-ceramic adhesive composite syst will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-210834