Coating processes – Medical or dental purpose product; parts; subcombinations;... – Dental product
Patent
1998-09-25
2000-06-13
Beck, Shrive
Coating processes
Medical or dental purpose product; parts; subcombinations;...
Dental product
264220, 264 16, 164 72, A61K 602, B22D 900, A61C 1308
Patent
active
060746904
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In the case of the production of frames for inlays, crowns and bridges, processes are known which replace the previous metal cast frame with a frame of spinel, alumina or metal powder. Such a process, which uses spinel or alumina as material, is known under the name VITA In-Ceram.RTM.. Another process, in which metal powder is used, is known under the name DEGUSSA-Degusint.RTM.. Both processes consist of the following important steps: hours, a working model is removed from the mold. the case of In-Ceram, a sealant is applied, whereby, on the other hand, in the case of Degusint, a bonding agent is used. 700.degree. C., subsequently preheated at 700.degree. C. for 5 min, thereafter heated to 1100.degree. C., and calcined for 2 min. at 120.degree. C. and then heated to 1120.degree. C. over 2 hours and kept for 2 hours. the frame because of the gypsum shrinkage. calcining of the frame, and the usual finishing of the frame, such as grinding off of the edges, sand blasting and again calcining. 700.degree. C. in a graphite box for 10 min in an open oven chamber and thereafter sintered for 15 min at a temperature of 1090.degree. C. (Degusint U) or 975.degree. C. (Degusint G). After expiration of the sinter time, the graphite box is transferred immediately and without interruption into the vacuum box; the cooling time amounts to at least 15 min.
From the above description, it can be seen that this process is very time-and labor intensive. The expenditure of time for a frame amounts, in the case of the In-Ceram process, to about 14 hours and, in the case of Degusint, to about 4 hours.
BRIEF SUMMARY OF THE INVENTION
Inlays, crowns, and bridges for use in dental techniques are produced in accordance with the invention by drawing a shrink foil onto the stump or stumps of a working model, applying a slip onto the shrink foil, removing the shrink foil and the slip from the working model, and calcining the slip and the shrink foil, whereby the shrink foil burns off of the slip.
DETAILED DESCRIPTION OF THE INVENTION
Therefore, it is a task of the present invention to r educe the work and time expenditure in the case of the production of frames from spinel, alumina or metal powder. This task is accomplished by a process which includes the following process steps: powder. powder, is removed from the working model and calcined.
It can hereby be seen that the process provides considerable advantages. First of all, the doubling does not apply and thus the production of a second gypsum model is not needed. In the case of the production of bridges, the laborious surface grinding, sawing, and sticking of the working model onto an aluminium oxide bar does not take place. The 6 hours beating of a working model to 120.degree. C. for the purpose of the removal of the moisture of the working model is also not necessary. Since, in the case of the process according to the invention, the foil is simply burnt, no special directions to heat up to the sinter temperature are necessary. On the other hand, in the case of the gypsum model according to the prior art, a heating up time of about 2 hours is needed in order to give the gypsum the possibility for shrinkage in order to be able to remove it from the frame.
Before the foil is shrunk onto the model, it is expedient to provide the stumps with a distance lacquer, which is again removed after the deep drawing.
Furthermore, it is advantageous to sandblast the foil after the deep drawing in order to improve the adhesion of the slip or metal powder if an already pre-treated foil is not used.
In the case of the production of bridge members, previously produced deep drawn shells can be fixed between two stumps which correspond in their form to the intermediate space.
In the case of application of the slip, these templates are filled with slip and thereby bound with the crowns.
In addition, it is also to be noted that, in principle, processes other than deep drawing are possible in order to achieve small caps of a desired layer thickness of 20-80 .mu.m, preferabl
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patent: 4957667 (1990-09-01), Hamer
patent: 5024711 (1991-06-01), Gasser et al.
patent: 5203398 (1993-04-01), Easwaran
patent: 5702514 (1997-12-01), Petticrew
Beck Shrive
Kolb Jennifer
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