Dentistry – Method or material for testing – treating – restoring – or... – By filling – bonding or cementing
Patent
1993-05-26
1994-10-25
Mancene, Gene
Dentistry
Method or material for testing, treating, restoring, or...
By filling, bonding or cementing
433215, A61C 504, A61C 500
Patent
active
053584066
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method for adapting and implanting at least one dental porcelain chip in a cavity, in which the cavity and each porcelain chip is subjected to necessary etching, silanisation, and application of a binder before implantation takes place.
Characteristically, existing methods for placing fillings which are inexpensive to the patients are also technically/medically unsatisfactory, whereas methods providing qualitatively satisfactory results are very expensive. Now, a new method is proposed which provides optimal results to the patients at relatively reasonable costs.
Today there are two kinds of "filler materials". One kind consists of the plastic materials (amalgam, composites, and glassionomeric cement), which have the property of curing in the mouth. This group of fillers is inexpensive, but each material is separately connected with essential disadvantages. The other main group is prepared outside the mouth, before cementation in the mouth occurs. The point of this new method is to combine use of the main groups in such a manner that the advantages of both groups are achieved, at the same time as disadvantages are minimized.
In order to describe the present situation it should be mentioned that amalgam is a strong and inexpensive material, but it is aesthetically unsatisfactory and contains large amounts of mercury. It is, thus, on its way out now.
Composites (plastic fillers) are unsuitable in the molar area, and are not particularly suitable in the premolar areas (i.e. teeth behind the canine teeth). The load in these areas will readily cause fillings to crack and be prone to scaling. During the curing process the material, furthermore, is deformed with a consequent hazard of due to cracking injuries of the teeth as well as damage to the nerves.
Glassionomeric fillings are not very durable in areas with high loads.
Gold inlays are qualitatively first class, but often aestethically unsatisfactory, and they are also labour intensive and very expensive.
Composites may be manufactured by a dental technician in stead of being provided to form fillings. Most of the above mentioned disadvantages of composites may, in that case, be avoided, but the inlays still readily crack. Manufacture by a dental technician is also considerably more expensive.
Porcelain inlays or inserts which are manufactured by a dental technician may readily show porosities and may thus break. The laboratories of dental technicians do not permit manufacture of porcelain under optimal conditions of pressure and temperature. Also, porcelain inlays manufactured by technichians are very expensive.
Prefabricated or industrially produced porcelain is considerably stronger than the porcelain inlays, which may be manufactured in the technichian's laboratories. A recently developed system, the so called CAD-CAM, is based on fitting prefabricated porcelain blocks. The (only) CAD-CAM system on the market is introduced by Siemens and designated Cerec. This system is characterized by the fact that the porcelain inlay is grind fitted by the dentist by the aid of a machine. The system has the essential advantage that the inlay can be completed in one operation, and that it is unnecessary to involve a technichian. The result is a very robust porcelain filling. A disadvantage of the system is that it is initially very cost intensive. At present the system requires an investment of approximately NOK 300 000. Additionally, there are costs of material in the order of NOK 100 for each insert. Also, use of the system is quite complicated. Before the dentist manufactures an inlay, the preparation (excavation) must be photographed three-dimensionally by the aid of a special video camera. Photography requires optimal conditions and it may be difficult to achieve a useful result. It is necessary to screen the area by rubber dam (a special plastic mask), and to spray the tooth with a special powder to permit the camera to record shapes and differences of height. After photography an image of the tooth i
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Lucchesi Nicholas D.
Mancene Gene
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