METHOD FOR PRODUCING A DENTAL PROSTHESIS

Abstract

A method of producing a dental prosthesis produced from a gum part, and prosthetic teeth arranged on the gum part and connected to the gum part. The surface of the dental prosthesis is surface-treated, the surface treatment of the dental prosthesis involving a solvent, and the solvent containing at least one chlorohydrocarbon and at least one methane nitroderivative.

Claims

1. A method for producing a dental prosthesis, wherein the dental prosthesis is produced from a gum part and prosthetic teeth arranged on the gum part and connected to the gum part and wherein the surface of the dental prosthesis is subjected to a surface treatment, wherein the surface treatment of the dental prosthesis is effected with a solvent, wherein the solvent contains at least one chlorinated hydrocarbon and at least one nitro derivative of methane.

2. The method according to claim 1, wherein the solvent contains at least one chlorinated hydrocarbon at 50 to 80 percent by weight and at least one nitro derivative of methane at 15 to 45 percent by weight.

3. The method according to claim 1, wherein the production of the dental prosthesis comprises the steps of producing the gum part by machining, in particular milling, a first plastic blank, producing the prosthetic teeth by machining, in particular milling, at least one second plastic blank and connecting, in particular gluing, the prosthetic teeth to the gum part to form the dental prosthesis.

4. The method according to claim 3, wherein the connection of the prosthetic teeth to the gum part is effected by the solvent.

5. The method according to claim 4, wherein the prosthetic teeth and the gum part have contact areas, via which the prosthetic teeth and the gum part contact each other in the assembled state, wherein the connection is effected by depositing the solvent on the contact area of the gum part and/or of the prosthetic teeth before assembly.

6. The method according to claim 1, wherein the at least one chlorinated hydrocarbon is selected from the group chloroform, 1,2-dichloroethane, dichloromethane, trichloroethylene, acetyl chloride and mixtures thereof.

7. The method according to claim 1, wherein the at least one nitro derivative of methane is selected from the group nitromethane, dinitromethane, trinitromethane, tetranitromethane and mixtures thereof.

8. The method according to claim 1, wherein the solvent contains up to 10 percent by weight, preferably between 0.1 percent by weight and 10 percent by weight, ethanol or derivatives thereof - preferably selected from the group ethanol, acetic acid, acetaldehyde, ethyl acetate, diethyl ether, formic acid ethyl ester and mixtures thereof.

9. The method according to claim 1, wherein the solvent contains up to 7.5 percent by weight, preferably between 0.1 percent by weight and 7.5 percent by weight, aromatics or alcohols thereof or ethers of alcoholic aromatics—preferably selected from the group benzene, benzyl alcohol, phenoxyethanol, catechol, resorcinol, hydroquinone and mixtures thereof.

10. The method according to claim 1, wherein the solvent contains up to 4 percent by weight, preferably between 0.1 percent by weight and 4 percent by weight, cycloalkanes or heterocyclic compounds—preferably selected from the group cyclohexane, cyclopentane, oxane, oxalan, oxetane and mixtures thereof.

11. The method according to claim 1, wherein the solvent, preferably only, contains the constituents: dichloromethane at 65 percent by weight to 85 percent by weight, preferably at 75 percent by weight, nitromethane at 15 percent by weight to 25 percent by weight, preferably at 20 percent by weight, ethanol at 2 percent by weight to 4 percent by weight, preferably at 3 percent by weight, and phenoxyethanol at 1 percent by weight to 3 percent by weight, preferably at 2 percent by weight.

12. The method according to claim 1, wherein the surface treatment is effected by painting the dental prosthesis with the solvent.

13. The method according to claim 12, wherein the surface treatment by painting comprises: depositing the solvent on the dental prosthesis with a brush, leaving the solvent to act, preferably for approximately 30 seconds to 3 minutes, and rinsing the surface of the dental prosthesis with water.

14. The method according to claim 1, wherein the surface treatment is effected by dipping the dental prosthesis into the solvent.

15. The method according to claim 14, wherein the surface treatment by dipping comprises: dipping the dental prosthesis into the solvent, preferably for one second to 30 seconds, drying the dental prosthesis, preferably by means of compressed air, and cleaning the surface of the dental prosthesis, preferably for approximately one minute and preferably with ultrasound.

16. The method according to claim 1, wherein the surface treatment is effected by vapor deposition of the solvent on the dental prosthesis.

17. The method according to claim 16, wherein the surface treatment by vapor deposition comprises: introducing the dental prosthesis into a, preferably airtight, vapor-deposition chamber, closing the vapor-deposition chamber, optionally lowering the pressure in the vapor-deposition chamber, letting the solvent into the vapor-deposition chamber, which leads to a vaporization of at least some of the solvent, whereby the solvent vapor condenses on the surface of the dental prosthesis, leaving the solvent to act, preferably for at least 30 seconds, opening the vapor-deposition chamber and removing the dental prosthesis from the vapor-deposition chamber.

18. A dental prosthesis produced using the method according to claim 1, with a gum part and prosthetic teeth arranged on the gum part and connected to the gum part, wherein a solvent is applied to the surface of the dental prosthesis and this solvent contains a chlorinated hydrocarbon, preferably at 50 percent by weight to 80 percent by weight, and a nitro derivative of methane, preferably at 15 percent by weight to 45 percent by weight.

19. A solvent for a dental prosthesis, in particular for use in a surface treatment of a dental prosthesis produced by the method according to claim 1, wherein the solvent contains: at least one chlorinated hydrocarbon, preferably at 50 percent by weight to 80 percent by weight, and at least one nitro derivative of methane, preferably at 15 percent by weight to 45 percent by weight, as constituents.

20. The solvent according to claim 19, wherein the solvent contains: at least one ethanol or derivatives thereof at 0.1 percent by weight to 10 percent by weight, at least one aromatic or alcohols thereof or ethers of alcoholic aromatics at 0.1 percent by weight to 7.5 percent by weight and at least one cycloalkane or heterocyclic compounds thereof at 0.1 percent by weight to 4 percent by weight as constituents.

21. The solvent according to claim 19, wherein the solvent contains: dichloromethane at 65 percent by weight to 85 percent by weight, preferably at 75 percent by weight, nitromethane at 15 percent by weight to 25 percent by weight, preferably at 20 percent by weight, ethanol at 2 percent by weight to 4 percent by weight, preferably at 3 percent by weight, and phenoxyethanol at 1 percent by weight to 3 percent by weight, preferably at 2 percent by weight, as constituents.

22. A use of the solvent according to claim 19 for the surface treatment of a dental prosthesis in a method for producing the dental prosthesis.

Description

BRIEF DESCRIPTIONS OF THE DRAWINGS

[0034] Further details and advantages of the present invention are explained in more detail below with the aid of the description of the figures with reference to the embodiments represented in the drawings, in which:

[0035] FIG. 1 shows two plastic blanks schematically,

[0036] FIG. 2 shows a CNC machine with a fixed plastic blank,

[0037] FIG. 3 shows a gum part with recesses,

[0038] FIG. 4 shows several prosthetic teeth,

[0039] FIG. 5 shows a dental prosthesis consisting of a gum part and prosthetic teeth,

[0040] FIG. 6 shows a bottle filled with solvent,

[0041] FIG. 7 shows a dental prosthesis with brush during the depositing of solvent,

[0042] FIG. 8 shows a dip tank with dental prosthesis dipped in,

[0043] FIG. 9 shows a dental prosthesis in a vapor-deposition chamber, and

[0044] FIG. 10 shows a polished, shiny and smooth dental prosthesis.

DETAIL DESCRIPTION OF THE INVENTION

[0045] FIG. 1 shows two plastic blanks K1 and K2. In principle, these can have any desired shape. These plastic blanks K1 and K2 are preferably formed disc-shaped. The first plastic blank K1 has a reddish, preferably flesh-coloured, colour. The gum part 2 is carved out of this. The second plastic blank K2 has a whitish to beige colour. The prosthetic teeth 3 are carved out of this.

[0046] FIG. 2 schematically shows a CNC machine 6. This has a housing 8, a holder 7 movable relative to the housing 8, for a plastic blank K1 or K2 and a machining device 9 with a machining tool 10 for machining the plastic blank K1 or K2. To produce the dental prosthesis 1 the plastic blanks K1 and K2 are fixed in the holder 7 and machined by the machining device 9 in a material-removing manner on the basis of stored data or data definable by a dental technician. As an example of such a machine, reference can be made to EP 3 095 412 B1.

[0047] FIG. 3 schematically shows a gum part 2, which has been carved out of the first plastic blank K1. Several recesses 11 (or depressions) for attaching prosthetic teeth 3 are formed in this gum part 2.

[0048] FIG. 4 shows several prosthetic teeth 3, which have been carved out of the second plastic blank K2. These prosthetic teeth 3 in this case are formed in one piece. However, several individual pieces, each forming a prosthetic tooth 3, can also be carved out of the second plastic blank K2.

[0049] FIG. 5 shows an assembled dental prosthesis 1 in the form of dentures, wherein the prosthetic teeth 3 are connected, preferably glued, to the gum part 2. The surface F of the dental prosthesis 1 is still relatively rough and matte because of the rather coarse machining with the machining tool 10.

[0050] A solvent P is used for the surface treatment of the dental prosthesis 1. FIG. 6 schematically shows a bottle, which is filled with such a liquid solvent P. This solvent P contains at least one chlorinated hydrocarbon at 50 percent by weight to 80 percent by weight and at least one nitro derivative of methane at 15 percent by weight to 45 percent by weight. Specifically, this solvent P contains at least dichloromethane (CH.sub.2Cl.sub.2) and nitromethane (CH.sub.3NO.sub.2). In addition, this solvent P preferably contains ethanol (C.sub.2H.sub.6O) and phenoxyethanol (C.sub.8H.sub.10O.sub.2).

[0051] FIG. 7 schematically shows the surface treatment by painting. Specifically, the solvent P is deposited on the surface F of the dental prosthesis 1 with a brush 4. After the solvent has been left to act and has cured, the dental prosthesis 1 is rinsed with water.

[0052] FIG. 8 schematically shows the surface treatment by dipping the dental prosthesis 1 into the liquid solvent P. For this purpose, the dental technician takes the dental prosthesis 1 with a suitable tool 12, for example in the form of tongs, and dips the dental prosthesis 1 into a dip tank 13 filled with solvent P. This dipping can last approx. 1 to 30 seconds. In the process the dental prosthesis 1 is turned in the solvent P. A drying of the dental prosthesis 1 is then effected with compressed air (preferably at 4 to 6 bar). After the drying, the dental prosthesis is cleaned for approx. 1 minute using ultrasound.

[0053] FIG. 9 schematically shows a sealable vapor-deposition chamber 5. First, the dental prosthesis 1 is placed in the vapor-deposition chamber 5 (or optionally held in a movable holder). Then, the vapor-deposition chamber 5 is closed and a negative pressure is generated in the vapor-deposition chamber 5. Then, solvent P is sprayed into the vapor-deposition chamber 5 via a nozzle 14, whereby a solvent mist or vapor forms in the vapor-deposition chamber 5. This solvent mist or solvent vapor condenses on or wets the surface F of the dental prosthesis 1. After a sufficient exposure time, the solvent mist is extracted by suction, the vapor-deposition chamber 5 is opened and the polished dental prosthesis 1 is removed.

[0054] Finally, FIG. 10 schematically shows a dental prosthesis 1 with a gum part 2 and prosthetic teeth 3 arranged on the gum part 2 and connected to the gum part 2, wherein the solvent P is applied to the surface F of the dental prosthesis 1. As a result, the surface F is shiny and as smooth as possible.

LIST OF REFERENCE NUMBERS

[0055] 1 dental prosthesis [0056] 2 gum part [0057] 3 prosthetic teeth [0058] 4 brush [0059] 5 vapor-deposition chamber [0060] 6 CNC machine [0061] 7 holder [0062] 8 housing [0063] 9 machining device [0064] 10 machining tool [0065] 11 recesses [0066] 12 tool [0067] 13 dip tank [0068] 14 nozzle [0069] F surface of the dentures [0070] P solvent [0071] K1 first plastic blank [0072] K2 second plastic blank