Method for Producing Structured Layers for Materials for Producing Dental Prostheses, and Device for This Purpose

Abstract

The invention relates to a method for producing a plastics body with patterned layers for producing dental prostheses having the steps: method for production, wherein the method is characterized by the following steps: A) providing a first and a second PMMA-based compound which are uncured and have different colorations; B) heating of a first patterned pressing surface to between 90? C. and 150? C.; C) pressing of the first PMMA-based compound with the heated first pressing surface, such that a patterned surface of the first PMMA-based compound is obtained; D) detachment of the first pressing surface; E) heating of the first or of a second patterned pressing surface to between 90? C. and 150? C.; F) pressing of the second PMMA-based compound with the heated pressing surface, such that a patterned surface of the second PMMA-based compound is obtained; G) detachment of the pressing surface; H) subsequent laying of the patterned first and second PMMA-based compounds on one another such that the patterned surface of the second PMMA-based compound is oriented toward the patterned surface of the first PMMA-based compound; and I) compression molding of the first with the second patterned PMMA-based compound, such that a solid bond is created between the first PMMA-based compound and the second PMMA-based compound.

The invention also relates to a device for implementing such a method.

Claims

1. A method for producing a plastics body with patterned layers for producing dental prostheses, wherein the method comprises the following steps: A) providing a first PMMA-based compound and a second PMMA-based compound, wherein the first PMMA-based compound is uncured and has a first coloration and wherein the second PMMA-based compound is uncured and has a second coloration, wherein the second coloration of the second PMMA-based compound differs from the first coloration of the first PMMA-based compound; B) heating a first patterned pressing surface to a temperature of between 90? C. and 150? C.; C) pressing the first PMMA-based compound with the heated first patterned pressing surface, wherein a patterned surface of the first PMMA-based compound is obtained in this manner; D) subsequently detaching the first pressing surface from the patterned first PMMA-based compound, wherein the patterned surface of the first PMMA-based compound is retained; and E) heating the first patterned pressing surface to a temperature of between 90? C. and 150? C. or heating of a second patterned pressing surface to a temperature of between 90? C. and 150? C.; F) pressing the second PMMA-based compound with the heated first patterned pressing surface or the heated second patterned pressing surface, wherein a patterned surface of the second PMMA-based compound is obtained in this manner; G) subsequently detaching the first pressing surface or the second pressing surface from the patterned second PMMA-based compound, wherein the patterned surface of the second PMMA-based compound is retained; H) subsequently laying the patterned second PMMA-based compound on the patterned first PMMA-based compound, such that the patterned surface of the second PMMA-based compound is oriented toward the patterned surface of the first PMMA-based compound; and I) subsequently compression molding the first patterned PMMA-based compound with the second patterned PMMA-based compound, such that a solid bond is created between the first PMMA-based compound and the second PMMA-based compound.

2. The method according to claim 1, comprising: step J) curing the patterned first PMMA-based compound and the second PMMA-based compound compression molded therewith, wherein step J) preferably proceeds after step I).

3. The method according to claim 2, comprising: pressing an uncured third PMMA-based compound proceeds with two heated patterned pressing surfaces arranged opposite one another, wherein a patterned surface is consequently obtained on both sides of the third PMMA-based compound, wherein the third PMMA-based compound has a third coloration which differs from the first coloration of the first PMMA-based compound and from the second coloration of the second PMMA-based compound, subsequently detaching the pressing surfaces from the third PMMA-based compound patterned on both sides, wherein the two patterned surfaces of the third PMMA-based compound are retained, wherein in step H) the patterned third PMMA-based compound is arranged between the patterned second PMMA-based compound and the patterned first PMMA-based compound, such that the patterned surfaces lie against one another, and wherein in step I) subsequent compression molding of the first patterned PMMA-based compound with the second patterned PMMA-based compound and with the third patterned PMMA-based compound arranged therebetween proceeds such that a solid bond is created between the first PMMA-based compound, the second PMMA-based compound and the third PMMA-based compound.

4. The method according to claim 2 wherein in step H) overall a plurality of further PMMA-based compounds are arranged between the first patterned PMMA-based compound and the patterned second PMMA-based compound, wherein the colorations of adjacent PMMA-based compounds of the first, second, and plurality of PMMA-based compounds preferably differ from one another, wherein before step H) each of the plurality of further PMMA-based compounds is patterned with two heated patterned pressing surfaces arranged opposite one another, wherein a patterned surface is consequently obtained on both sides of the plurality of further PMMA-based compounds, and the pressing surfaces are subsequently detached from the plurality of further PMMA-based compounds patterned on both sides, wherein the two patterned surfaces of the plurality of further PMMA-based compounds are retained, and in step I) subsequent compression molding of the first patterned PMMA-based compound with the second patterned PMMA-based compound and with the plurality of further patterned PMMA-based compounds arranged therebetween proceeds such that a solid bond is created between the first PMMA-based compound, the second PMMA-based compound and the plurality of further PMMA-based compounds arranged therebetween.

5. The method according to claim 1, wherein pressing of the first PMMA-based compound in step C) with the heated first patterned pressing surface and pressing of the second PMMA-based compound in step F) with the first patterned pressing surface or with the second heated patterned pressing surface proceeds with a pressure of between 10 kN/m.sup.2 and 500 kN/m.sup.2, preferably with a pressure of between 10 kN/m.sup.2 and 100 kN/m.sup.2, particularly preferably with a pressure of between 10 kN/m.sup.2 and 50 kN/m.sup.2.

6. The method according to claim 3, wherein pressing of the third PMMA-based compound or of the further PMMA-based compounds with the two heated patterned pressing surfaces arranged opposite one another proceeds with a pressure of between 10 kN/m.sup.2 and 500 kN/m.sup.2, preferably with a pressure of between 10 kN/m.sup.2 and 100 kN/m.sup.2, particularly preferably with a pressure of between 10 kN/m.sup.2 and 50 kN/m.sup.2.

7. The method according to claim 1, wherein pressing of the first PMMA-based compound in step C) with the heated first patterned pressing surface and pressing of the second PMMA-based compound in step G) with the heated first patterned pressing surface or with the heated second patterned pressing surface proceeds for a period of between 1 s and 50 s, preferably for a period of between 5 s and 30 s, wherein preferably and if present, pressing of the third PMMA-based compound or of the plurality of further PMMA-based compounds with the two heated patterned pressing surfaces arranged opposite one another proceeds for a period of between 1 s and 50 s, preferably for a period of between 5 s and 30 s.

8. The method according to claim 1, wherein the first patterned pressing surface and/or the second patterned pressing surface is or are heated during pressing, preferably all the patterned pressing surfaces used are heated during pressing.

9. The method according to claim 1, wherein the first patterned pressing surface and/or the second patterned pressing surface, preferably all the patterned pressing surfaces used, have patterns with a profile height of between 1 mm and 5 mm, preferably with a profile height of between 2 mm and 3 mm.

10. The method according to claim 1, wherein a pressure of between 10 kN/m.sup.2 and 500 kN/m.sup.2, preferably of between 10 kN/m.sup.2 and 50 kN/m.sup.2 is applied for the compression molding in step I).

11. The method according to claim 1, wherein the first patterned pressing surface and/or the second patterned pressing surface, preferably all the patterned pressing surfaces used, have a honeycomb pattern or a plurality of peaks projecting from the pressing surface or a plurality of pyramidal or conical protrusions projecting from the pressing surface, wherein the projecting peaks or the projecting pyramidal or conical protrusions are preferably arranged periodically in the pressing surface.

12. The method according to claim 1, wherein the first patterned pressing surface and/or the second patterned pressing surface, preferably all the patterned pressing surfaces used, consist of silicone or are coated with silicone or consist of a metal, in particular of a stainless steel, wherein the metal is preferably coated, particularly preferably coated with Teflon or silicone.

13. The method according to claim 1, wherein the PMMA-based compounds have a viscosity of between 1 Pa.Math.s and 1000 Pa.Math.s at their time of use and at a temperature of 20? C.

14. A method for producing dental prostheses, wherein the method comprises a method according to claim 1 and the method additionally comprises the following step: K) carving out of a dental prosthesis or a plurality of individual dental prostheses from the completely cured plastics body after method steps A) to I) and optionally J), wherein a tooth axis of the dental prosthesis or tooth axes of the plurality of individual dental prostheses extends or extend from a basal end of the dental prosthesis or dental prostheses, wherein the dental prosthesis or the dental prostheses are subtractively carved out from the plastics body in such a manner that the tooth axis or the tooth axes extends or extend through a plurality of layers of the PMMA-based compounds of the plastics body and wherein carving out preferably proceeds with the assistance of a subtractive CAM process.

15. A device for implementing a method according to claim 1, the device comprising at least one patterned pressing surface and a base plate, wherein the at least one patterned pressing surface is heatable, and/or at least two patterned pressing surfaces arranged opposite one another which are heatable, at least two containers containing at least two differently colored fluid PMMA-based compounds or at least two containers containing the starting components for producing at least two differently colored fluid PMMA-based compounds, and a press for compression molding together at least two patterned PMMA-based compounds stacked on one another.

16. The device according to claim 15, wherein the device has a circumferential boundary wall which is arranged on the base plate and in which the at least one patterned pressing surface is movable or which is arranged around the at least two patterned pressing surfaces arranged opposite one another.

17. The device according to claim 15, wherein the device additionally has at least one filling means for applying the fluid PMMA-based compounds onto the base plate or between the two patterned pressing surfaces arranged opposite one another, wherein the at least one filling means is preferably suitable and provided for filling the PMMA-based compounds within the circumferential boundary.

Description

[0082] Exemplary embodiments of the invention are explained below with reference to nine schematic figures and one flow chart but without thereby limiting the invention. In the figures:

[0083] FIG. 1: shows the sequence of a method according to the invention with a device according to the invention as five partially sectional schematic views arranged above one another of the device according to the invention for implementing a method according to the invention,

[0084] FIG. 2: shows a schematic perspective view of a second heatable patterned pressing plate for implementing a method according to the invention,

[0085] FIG. 3: shows a schematic detail view of a surface of a PMMA-based compound shaped with the second patterned pressing plate according to FIG. 2,

[0086] FIG. 4: shows a schematic enlarged detail view of the patterned surface of a third heatable patterned pressing plate for implementing a method according to the invention,

[0087] FIG. 5: shows a schematic cross-sectional view of the pattern of the third patterned pressing plate according to FIG. 4,

[0088] FIG. 6: shows a schematic perspective partial view of a fourth heatable patterned pressing plate for implementing a method according to the invention,

[0089] FIG. 7: shows a schematic plan view of a patterned surface of a PMMA-based compound shaped with a heated patterned pressing plate in accordance with a method according to the invention,

[0090] FIG. 8: shows a magnified view of a ground cross-section of a boundary surface of two PMMA-based compounds of differing coloration bonded together by short pressing with the assistance of a method according to the invention,

[0091] FIG. 9: shows a magnified view of a ground cross-section of a further boundary surface of two PMMA-based compounds of differing coloration bonded together by longer pressing with the assistance of a method according to the invention, and

[0092] FIG. 10: shows the sequence of a method according to the invention for producing a plastics body with patterned layers for producing dental prostheses as a sequence diagram.

[0093] FIG. 1 shows the sequence of a method according to the invention with a device according to the invention as five partially cross-sectional schematic views arranged above one another of the device according to the invention for implementing a method according to the invention.

[0094] The device may have a base plate 1 and a boundary wall 2, wherein the boundary wall 2 may rest on the base plate 1 as a ring in the manner of a springform mold or can be fastened to the base plate 1. The device may furthermore have a filling means 3. The filling means 3 may have a pipe 4 and a container 5. A first fluid PMMA-based compound 6 can be applied to the base plate 1 in a defined amount using the filling means 3. The filling means 3 may for this purpose for example take the form of a dispensing device in the manner of a soap dispenser in order to dispense a defined quantity of the first PMMA-based compound 6. This situation is shown in the topmost drawing of FIG. 1. The first fluid PMMA-based compound 6 has a first coloration, for example a light tooth coloration.

[0095] The upper surface of the first PMMA-based compound 6 opposite the base plate 1 can be patterned with the assistance of a stamp 7 with a previously heated patterned pressing surface 8. The pressing surface 8 may for this purpose form a surface of the stamp 7. During pressing of the first PMMA-based compound 6, the pressing surface 8 may have a temperature of between 100? C. and 140? C., wherein the temperature may preferably be adapted to the material of the first PMMA-based compound 6. An electrical resistance heater (not shown) may be arranged in the stamp 7 for heating the patterned pressing surface 8. The temperature of the patterned pressing surface 8 may preferably be adjusted. Provision may also be made for the temperature of the patterned pressing surface 8 to be measured and/or controlled with the assistance of a temperature sensor (not shown).

[0096] The heated pressing surface 8 is pressed for a number of seconds onto the still fluid first PMMA-based compound 6 and in this manner a patterned surface 10 is produced on the first PMMA-based compound 6. This situation is shown in the second drawing from the top in FIG. 1. The stamp 7 with the patterned pressing surface 8 is then detached from the patterned surface 10 of the first PMMA-based compound 6. The pattern of the patterned surface 10 of the first PMMA-based compound 6 is retained since the heat transferred by the stamp 7 causes the first PMMA-based compound 6 to solidify. This situation is shown in the third drawing from the top in FIG. 1.

[0097] The device may furthermore have a second filling means (not shown). In the same way as the first PMMA-based compound 6, a second fluid PMMA-based compound 12 can be patterned on one side using the device with the heated patterned pressing surface 8 with the assistance of the base plate 1, the boundary wall 2 and the stamp 7. The second fluid PMMA-based compound 12 has a second coloration, for example a dark tooth coloration which differs from the coloration of the first PMMA-based compound 6. The second patterned PMMA-based compound 12 can then be laid with its surface 14 patterned in this way onto the patterned surface 10 of the first patterned PMMA-based compound 6. This situation is shown in the fourth drawing from the top in FIG. 1. Instead of using the stamp 7 with the pressing surface 8, a second stamp (not shown) with a differently shaped pressing surface may also be used, such that the second PMMA-based compound 12 receives a different surface pattern than the first PMMA-based compound 6.

[0098] At least one third PMMA-based compound (not shown) patterned on two opposite sides may optionally be placed between the patterned first PMMA-based compound 6 and the patterned second PMMA-based compound 12. The two patterned surfaces of the third PMMA-based compound arranged opposite one another may for this purpose be patterned with the assistance of two heated pressing surfaces arranged opposite one another. For this purpose, the base 1 may for example be replaced by a further stamp (not shown) with a pressing surface which is of similar structure to the stamp 7 with the pressing surface 8, such as for example the stamp 27 according to FIG. 2.

[0099] The patterned first PMMA-based compound 6 and the patterned second PMMA-based compound 12 and optionally the at least one patterned third PMMA-based compound arranged therebetween may then be joined together by pressing. A press 16 which presses the PMMA-based compounds 6, 12 against one another and against the base plate 1 may be used for this purpose. This situation is shown in the bottommost drawing of FIG. 1. A force of between 1 and 10 metric tons can be applied for this purpose.

[0100] After curing, a plastics body is accordingly obtained which consists of the two cured PMMA-based compounds 6, 12 joined together via the patterned surfaces 10, 14. This plastics body can be removed from the device and used to fabricate dental prostheses with a natural appearance with the assistance of a subtractive method.

[0101] A multilayered plastics body with a plurality of intermeshed PMMA-based compounds can be produced in this way. Patterning gives rise to a natural-looking boundary surface between the PMMA-based compounds in the plastics material, as is shown in FIGS. 8 and 9.

[0102] FIG. 2 shows a schematic perspective view of a second heatable patterned pressing plate for implementing a method according to the invention, and FIG. 3 shows a schematic detail view of a surface of a PMMA-based compound 37 shaped with the second patterned pressing plate according to FIG. 2. The patterned pressing plate is a stamp 27. The stamp 27 may have a flat cylindrical shape. One side of the stamp 27 takes the form of a heatable patterned pressing surface 28 with which the PMMA-based compound 37 can be shaped. A plurality of four-sided pyramidal protrusions 29 may be arranged for this purpose on the patterned pressing surface 28. The pyramidal protrusions 29 are arranged as a periodic grid on the patterned pressing surface 28. The stamp 27 may consist of a metal, such as for example a stainless steel. In addition, an electrical resistance heater (not shown) with which the patterned pressing surface 28 is heatable may be arranged in the interior of the stamp 27 or externally on its opposite side to the patterned pressing surface 28. The pyramidal protrusions 29 project with their apex of between 2 mm and 3 mm from their base.

[0103] The stamp 27 may be incorporated into a heater, such that thermostatically controlled heating of the pressing plates is possible. The PMMA-based compound 37 can be patterned with this structure. The PMMA-based compound 37 then has a patterned surface 38 which is shaped as a negative of the patterned pressing surface 28. The patterned surface 38 accordingly has a plurality of periodically juxtaposed pyramidal indentations 39. A plurality of such patterned PMMA-based compounds 37 of differing coloration may be laid with their patterned surfaces 38 on one another and then press-molded together.

[0104] FIG. 4 shows a schematic enlarged detail view of a patterned surface 48 of a third heatable patterned pressing plate 47 for implementing a method according to the invention and FIG. 5 shows a schematic cross-sectional view of the structure of the third patterned pressing plate 47 for this purpose. The pressing plate 47 has a honeycomb-shaped patterning in the form of honeycomb-shaped (hexagonal) indentations 49 which taper conically down to a base. A PMMA-based compound patterned therewith accordingly has a negative of the patterned surface 48 shown in FIGS. 4 and 5. The depth of the honeycomb-shaped indentations amounts to between 2? mm and 3? mm.

[0105] FIG. 6 shows a schematic perspective partial view of a fourth heatable patterned pressing plate 57 for implementing a method according to the invention. The patterned pressing plate is constructed like a stamp 57. One side of the patterned pressing plate 57 may take the form of a circular heatable patterned pressing surface 58 with which a PMMA-based compound can be shaped. A plurality of four-sided pyramidal indentations 59 may be arranged for this purpose in the patterned pressing surface 58. The pyramidal indentations 59 are arranged as a periodic square grid on the patterned pressing surface 58. The pyramidal indentations are between 2 mm and 3 mm deep. The patterned pressing plate 57 may have a projecting edge 60 which surrounds the patterned pressing surface 58 at the edge thereof. The patterned pressing plate 57 may consist of a thermally stable plastics material, such as for example a silicone. In addition, an electrical resistance heater (not shown) with which the patterned pressing surface 58 is heatable may be arranged in the interior of the patterned pressing plate 57 or externally on the side of the patterned pressing plate 57 opposite to the patterned pressing surface 58. Patterned pressing plates 57 are simpler and less costly to fabricate from silicone. As a material, however, silicone does not have the same fatigue strength and is thus not as suitable for manufacturing as most metals and in particular as steel. It is therefore preferred according to the invention to construct the patterned pressing surfaces from metal and in particular steel.

[0106] FIG. 7 shows a schematic plan view of a patterned surface 68 of a PMMA-based compound 67 shaped with a heated patterned pressing plate in accordance with a method according to the invention. A plurality of pyramidal indentations 69 periodically juxtaposed as a square grid rise up from the patterned surface 68. The pyramidal indentations 69 stand back with their apex between 2 mm and 3 mm from their base. A plurality of such patterned PMMA-based compounds 67 of differing coloration may be laid with their patterned surfaces 68 on one an and then press-molded together.

[0107] FIG. 8 shows a magnified view of a ground cross-section of a boundary surface of two PMMA-based compounds of differing coloration bonded together by short pressing with the assistance of a method according to the invention, and FIG. 9 shows a magnified view of a ground cross-section of a further boundary surface of two PMMA-based compounds of differing coloration bonded together by comparatively longer pressing with the assistance of a method according to the invention. The micrographs were taken with a LEICA DMS 1000 microscope at four- to six-times magnification.

[0108] The multilayer composite was produced by impressing standard dental material (Flexecure Dentin Zahnmaterial from Kulzer GmbH) as the first PMMA-based compound with a temperature of 115? C. for a duration of between 20 s and 70 s at a pressure with a pressing force of approx. 100 kg onto an area of 450 cm.sup.2. Pressing was carried out with a patterned pressing surface 38, as is shown in part in FIG. 4.

[0109] Subsequent to impressing, the patterned PMMA-based compounds were assembled, press-molded and polymerized.

[0110] An exemplary method is explained below with reference to the device according to the invention described with FIG. 1. The sequence of the exemplary method is shown in the sequence diagram according to FIG. 10. The description is, however, also straightforwardly transferable to other exemplary embodiments.

[0111] A first fluid PMMA-based compound 6 with a first coloration may be provided in a processing step 100. In parallel, a second fluid PMMA-based compound 12 with a second coloration may be provided in a processing step 101 and at least one third fluid PMMA-based compound with a third coloration may optionally be provided in a processing step 102.

[0112] The first fluid PMMA-based compound 6 may be applied onto a surface, such as for example onto the surface of the base plate 1, in a processing step 103 following processing step 100. Similarly, the second fluid PMMA-based compound 12 may be applied onto a surface, such as for example onto the surface of the base plate 1, in a processing step 104 following processing step 101. Similarly, the at least one third fluid PMMA-based compound may be introduced between two patterned heated pressing surfaces in a processing step 105 following the optional processing step 102.

[0113] A surface 10 of the first PMMA-based compound 6 can be patterned with the heated pressing surface 8 in a processing step 106 following processing step 103. In the same manner, a surface 14 of the second PMMA-based compound 12 can be patterned with the heated pressing surface 8 or another pressing surface in a processing step 107 following processing step 104, and two opposing surfaces of the at least one third PMMA-based compound may optionally be patterned with the two patterned heated pressing surfaces in a processing step 108 following processing step 105.

[0114] Subsequently, pressing surface 8 can be detached from the first PMMA-based compound 6 in a processing step 109 following processing step 106. Likewise, pressing surface 8 or the other pressing surface can be detached from the second PMMA-based compound 12 in a processing step 110 following processing step 107. In the optional branch of the method, the two pressing surfaces can be detached from the at least one third PMMA-based compound in an optional processing step 111 following optional processing step 108.

[0115] After these processing steps, the patterned second PMMA-based compound 12 can be arranged on the patterned first PMMA-based compound 6 in a processing step 112, such that the two patterned surfaces 10, 14 of the patterned first PMMA-based compound 6 and of the patterned second PMMA-based compound 12 are oriented toward one another. Alternatively, at least one patterned third PMMA-based compound can be arranged between the patterned first PMMA-based compound 6 and the patterned second PMMA-based compound 12, such that the two patterned surfaces 10, 14 of the patterned first PMMA-based compound 6 and of the patterned second PMMA-based compound 12 are oriented toward one another.

[0116] All the PMMA-based compounds 6, 12 arranged on one another are then compression molded together and the PMMA-based compounds 6, 12 cured in a processing step 113.

[0117] The resultant cured and layered plastics body may be removed in a processing step 114.

[0118] Subsequently, in an optional processing step 115, at least one dental prosthesis may be milled from the cured layered plastics body with the assistance of a subtractive method, such as for example with a CAM milling machine.

[0119] The features of the invention disclosed in the above description, as well as in the claims, figures, and exemplary embodiments, may be essential both individually and in any desired combination to realizing the invention in its various embodiments.

LIST OF REFERENCE SIGNS

[0120] 1 Base plate [0121] 2 Boundary wall [0122] 3 Filling means [0123] 4 Pipe [0124] 5 Container [0125] 6 PMMA-based compound [0126] 7 Stamp [0127] 8 Patterned pressing surface [0128] 9 Stamp [0129] 10 Patterned surface [0130] 12 Second PMMA-based compound [0131] 14 Patterned surface [0132] 16 Press [0133] 27 Stamp [0134] 28 Patterned pressing surface [0135] 29 Pyramidal protrusions [0136] 37 Patterned PMMA-based compound [0137] 38 Patterned surface [0138] 39 Pyramidal indentation [0139] 47 Pressing plate [0140] 48 Patterned pressing surface [0141] 49 Honeycomb-shaped indentation [0142] 57 Pressing plate [0143] 58 Patterned pressing surface [0144] 59 Pyramidal indentation [0145] 60 Edge [0146] 67 Patterned PMMA-based compound [0147] 68 Patterned surface [0148] 69 Pyramidal indentation [0149] 70 First PMMA-based compound [0150] 72 Second PMMA-based compound [0151] 74 Boundary surface [0152] 80 First PMMA-based compound [0153] 82 Second PMMA-based compound [0154] 84 Boundary surface [0155] 100 Processing step: provision of a first fluid PMMA-based compound with a first coloration [0156] 101 Processing step: provision of a second fluid PMMA-based compound with a second coloration [0157] 102 Optional processing step: provision of at least one third fluid PMMA-based compound with a third coloration [0158] 103 Processing step: application of the first fluid PMMA-based compound onto a surface [0159] 104 Processing step: application of the second fluid PMMA-based compound onto a surface [0160] 105 Optional processing step: introduction of the at least one third fluid PMMA-based compound between two patterned heated pressing surfaces [0161] 106 Processing step: patterning of a surface of the first PMMA-based compound with a heated pressing surface [0162] 107 Processing step: patterning of a surface of the second PMMA-based compound with a heated pressing surface [0163] 108 Optional processing step: patterning of two opposing surfaces of the at least one third PMMA-based compound with the two patterned heated pressing surfaces [0164] 109 Processing step: detachment of the pressing surface from the first PMMA-based compound [0165] 110 Processing step: detachment of the pressing surface from the second PMMA-based compound [0166] 111 Optional processing step: detachment of the two pressing surfaces from the at least one third PMMA-based compound [0167] 112 Processing step: arrangement of the patterned second PMMA-based compound on the patterned first PMMA-based compound, such that the two patterned surfaces of the patterned first and second PMMA-based compounds are oriented toward one another, or arrangement of the at least one patterned third PMMA-based compound between the patterned first PMMA-based compound and the patterned second PMMA-based compound, such that the two patterned surfaces of the patterned first and second PMMA-based compounds are oriented toward one another [0168] 113 Processing step: compression molding of all the PMMA-based compounds arranged on one another and curing of the PMMA-based compounds [0169] 114 Processing step: removal of the cured layered plastics body [0170] 115 Optional processing step: fabrication of at least one dental prosthesis from the cured layered plastics body