Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-08-20
2000-09-05
Merriam, Andrew E. C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523115, 523222, 524494, 4332281, C08K 702, A61K 6083
Patent
active
061144096
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a dental material which is curable with UV, light or laser beams and which is useful for the preparation of dental fillings, inlays/onlays, crowns, artificial teeth, bridges, dental protheses and implantates. The invention also refers to a tool for the polymerization of the dental composition according to the invention.
Restorative dental compositions must satisfy a large number of special requirements. They must be non-poisonous and biocompatible and must lead to products which have a high tensile strength or compression strength, a high durability during use, a good esthetic appearance and an excellent resistance against chemical influences by food and saliva as well as high resistance against electro-galvanic or electro-magnetic effects.
It is widely practised to prepare dental fillings from amalgam. They are inexpensive and they have good mechanical properties. In view of the mercury content, amalgam must be considered poisonous and can create severe health hazards. Furthermore, electro-galvanic or electro-magnetic influences may be damaging to the health.
Further, gold is known as a restorative dental material. It has excellent mechanical properties. However, gold is very expensive and frequently not acceptable for esthetic reasons. In the neighborhood of other metals health problems can arise due to electrical current.
Further, ceramic materials are known which are excellently suitable for dental restorative purposes due to their good appearance and their high abrasion resistance. However, they are liable to fracture, notably if the walls are thin and they are difficult to process.
It is also known to use combinations of gold and ceramic. It is further known to use ceramic or resin blocks for milling inlays or onlays. Again, these inserts have a high risk of fracturing and the occlusion is imprecise. Further, the necessary equipment is very expensive.
Moreover, composite materials for dental restorative purposes are known, which consist of a mixture of resin, filler and dye stuff. The filler has the purpose of decreasing the tendency to shrink during polymerization and to improve certain mechanical properties. However, composite materials fracture easily.
It is further known to prepare whole artificial teeth on the basis of fiber composites (German Patent 32 43 861). These contain short carbon fibers. Such short fibers cannot sustain the high forces which are exerted across the relevant spaces or surfaces. Therefore, also this material tends to break. Also, such dental restorative products do not satisfy the above requirements. Carbon fibers are also not preferable for esthetic reasons.
U.S. Pat. No. 5,176,951 describes a process for reforcing dental prostheses. According to this process the area to be reinforced is provided with a layer of a dental material whereupon a web is layed onto this layer of material and finally a further layer of dental material is used to cover the web. According to this process a special woven web is used which must be cut with a special pair of scissors. It is not to be touched by bare hands during the application and it must be impregnated with monomer liquid prior to the application. Therefore, this process is extremely complicated in terms of skill, time and the likelyhood of failure. Above all its applications are very limited. Notably, this process is not suitable for preparing dental fillings.
It is therefore the problem of the present invention to provide a dental material which can be processed simply, quickly and without troubles and which has no limitations in terms of the scope of usefulness and which notably is also useful for dental filling purposes and which nevertheless exhibits the advantages of fiber reinforcement in an optimum way.
This problem is solved in accordance with claim 1. Further advantageous embodiments are defined in the subclaims.
In addition to the filaments or the web microfine filler is incorporated within the matrix. By this feature, the ready-to-use material combines the advantages of having on the one side th
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