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The present invention relates to a method and a system for preparing dental restorations from ceramic or polymeric material to achieve color and opacity gradients simulating natural dentition, wherein an ingot of ceramic or polymeric material is entirely or partially forced through a system of chann

The present invention relates to a method and a system for preparing dental restorations from ceramic or polymeric material to achieve color and opacity gradients simulating natural dentition, wherein an ingot of ceramic or polymeric material is entirely or partially forced through a system of channels in a press mold into a mold cavity in the press mold, wherein the mold cavity corresponds to a dental restoration.

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What is claimed is: 1. A system for preparing dental restorations from a ceramic or polymeric material to achieve colour and opacity gradients simulating natural dentition, wherein the system comprises: a mold cavity connected to a system of channels having a first flow path and a second flow path,

What is claimed is: 1. A system for preparing dental restorations from a ceramic or polymeric material to achieve colour and opacity gradients simulating natural dentition, wherein the system comprises: a mold cavity connected to a system of channels having a first flow path and a second flow path, wherein the second flow path has a greater volume than the first flow path; an ingot fabricated of a ceramic or polymeric material; a press muffle and a press muffle base that form a press mold; wherein the press muffle base has an extension that has a shape that corresponds to the shape of the ingot, wherein the extension forms a press space in the press mold; wherein the ingot comprises a first volume region and a second volume region, wherein the first and second volume regions differ in color or opacity or both color and opacity; wherein the first volume region is forced into the first flow path and the second volume region is forced into the second flow path such that the first volume region fills in a first portion of the mold cavity and the second volume region fills in a second portion of the mold cavity. 2. The system of claim 1 wherein the system of channels comprises additional flow paths and wherein the ingot comprises additional volume regions for flowing into the additional flow paths. 3. The system of claim 2 wherein the additional volume regions of the ingot have different color or opacity or different color and opacity. 4. The system of claim 3 wherein the mold cavity and system of channels are located in a press mold. 5. The system of claim 1 wherein the mold cavity and system of channels are formed from a model and attached sprue pin system, whereby the model and attached sprue system are fabricated of a material that can be burned out completely. 6. The system of claim 2 wherein the first, second and additional volume regions are separate components that are fused together by pressing and/or heating to form the ingot. 7. The system of claim 5 wherein the sprue pin system comprises an extension that forms a reservoir in the system of channels, whereby the extension comprises a scale marking various lengths on the extension for shortening the extension. 8. The system of claim 2 wherein the first, second and/or additional flow paths comprise a reservoir to increase the volume of the flow path. 9. The system of claim 1 further comprising additional mold cavities connected to the system of channels. 10. The system of claim 2 wherein the color and/or opacity of the first, second and additional volume regions is consistent throughout each region. 11. The system of claim 2 wherein the ingot is cylindrical, round, rectangular, square or polygonal in shape. 12. The system of claim 1 wherein the first volume region and the second volume region extend substantially along the same molding direction and are substantially adjacent to one another at a plane with a normal that is substantially parallel to the molding direction. 13. The system of claim 1 wherein the first volume region and the second volume region extend substantially along the same molding direction and are substantially adjacent to one another at a plane with a normal that extends obliquely to the molding direction. 14. The system of claim 1 wherein the first volume region and the second volume region are axially aligned one atop of the other. 15. The system of claim 2 wherein the first volume region, the second volume region, and additional volume regions are axially aligned one atop of the other. 16. The system of claim 1 wherein the first volume region is greater in volume than the second volume region. 17. The system of claim 1 wherein the ingot comprises an anti-rotational component for proper orientation of the ingot in the press mold. 18. The system of claim 17 wherein the anti-rotational component comprises a groove, bevel, or flattened section on the ingot. 19. The system of claim 1 wherein a height of the extension is adjustable. 20. The system of claim 5 wherein the material that can be burned out completely comprises acrylic or wax. 21. The system of claim 5 wherein the sprue pin system is configured with an extension, whereby the extension produces a reservoir in the second flow path in the production of the system of channels, wherein the height and volume of the extension can be adjusted to produce a reservoir of desired height and volume. 22. The system of claim 5 wherein the sprue pin system is configured to connect to two or more models of dental restorations. 23. The system of claim 1 further comprising a piston, wherein the piston is configured to fit within the press space and forces the ingot through the system of channels. 24. The system of claim 1 wherein the first volume region and the second volume region comprise a full volume region or a partial volume region. 25. The system of claim 2 wherein the additional volume regions comprise a full volume region or a partial volume region. 26. A system for preparing dental restorations from a ceramic or polymeric material to achieve colour and opacity gradients simulating natural dentition, wherein the system comprises: a mold cavity connected to a system of channels having a first flow path and a second flow path, wherein the second flow path has a greater volume than the first flow path; an ingot fabricated of a ceramic or polymeric material; wherein the ingot comprises a first volume region and a second volume region, wherein the first and second volume regions differ in color or opacity or both color and opacity; wherein the first volume region is forced into the first flow path and the second volume region is forced into the second flow path such that the first volume region fills in a first portion of the mold cavity and the second volume region fills in a second portion of the mold cavity; wherein the mold cavity and system of channels are formed from a model and attached sprue pin system, whereby the model and attached sprue system are fabricated of a material that can be burned out completely.