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Publication numberWO2005007007 B1
Publication typeApplication
Application numberPCT/US2004/021971
Publication date4 Aug 2005
Filing date9 Jul 2004
Priority date9 Jul 2003
Also published asCA2531624A1, EP1654104A2, EP1654104A4, US6979496, US20050008887, US20060204932, WO2005007007A2, WO2005007007A3
Publication numberPCT/2004/21971, PCT/US/2004/021971, PCT/US/2004/21971, PCT/US/4/021971, PCT/US/4/21971, PCT/US2004/021971, PCT/US2004/21971, PCT/US2004021971, PCT/US200421971, PCT/US4/021971, PCT/US4/21971, PCT/US4021971, PCT/US421971, WO 2005/007007 B1, WO 2005007007 B1, WO 2005007007B1, WO-B1-2005007007, WO2005/007007B1, WO2005007007 B1, WO2005007007B1
InventorsBasil Haymann, Mark S Quadling, Henley S Quadling, Howard Frysh, Jorey A Chernett
ApplicantD4D Technologies Lp
Export CitationBiBTeX, EndNote, RefMan
External Links: Patentscope, Espacenet
Assemblage of mill blanks
WO 2005007007 B1
Abstract
The present invention relates generally to mill blank constructions to facilitate the manufacture of dental restorations. A given mill blank is formed in a shape (i.e. with a given geometry) that has been predetermined to reduce material waste when the mill blank is machined into the final part. A set of two or more blanks each having such characteristics comprise a smart blank “library”. In one embodiment, a smart blank library includes a sufficient number of unique blanks such that, when the geometry of the designed restoration is known, the smart blank with a highest yield can be selected for use in milling the restoration. The “yield” of a given smart blank represents the amount of material of the smart blank that is actually used in the final restoration. Automated processes for smart blank inventory management and smart blank selection are also described.
Amended Claims  (OCR text may contain errors)
AMENDED CLAIMS [received by the International Bureau on 20 May 2005 (20.05.05); original claims 1-6, 8, 10 and 16 amended; claims 7, 11 and 13 cancelled]
1. (currently amended). A method of assembling blanks for use in manufacturing dental restorations, comprising: given a set of blanks, selecting an assemblage of the blanks, wherein at least first and second of the blanks in the assemblage comprise a body adapted to be shaped by material removal, the body of the first blank having a geometry that differs from the body of the second blank by other than scaling, and wherein the body of each of the first and second blanks has at most one symmetric plane; and using that assemblage to manufacture dental restorations.
2. (currently amended) The method as described in claim 1 wherein the assemblage of the blanks is selected to maximize an average yield per blanlc, wherein the average yield per blank is calculated as a weight of a finished restoration divided by a weight of a blank prior to being shaped by material removal.
3. (currently amended) The method as described in claim 2 wherein the average yield per blank is a weighted average.
4. (currently amended) The method as described in claim 1 wherein the assemblage of the blanks is selected to balance an average yield per blank with a productivity factor.
5. (currently amended) The method as described in claim 1 wherein the assemblage of the blanks is selected to balance an average yield per blanlc with a cost factor.
6. (currently amended) The method as described in claim 1 wherein the assemblage of the blanks is selected to balance a set of yield, productivity, cost and tooth distribution factors.
7. (canceled).
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8. (currently amended) An assemblage, comprising: a plurality of mill blanks, at least first and second of the mill blanks in the plurality each comprising a body adapted to be shaped by material removal; wherein the body of the first blank has a geometry that differs from the body of the second blank by other than scaling; wherein the body of each of the first and second blanks has at most one symmetric plane.
9. (original) The assemblage as described in claim 8 wherein each blank includes a holder to enable the blank to be maintained within a shaping apparatus.
10. (currently amended) The assemblage as described in claim 8 wherein at least one of the blanks is formed of a metal or metal alloy.
11. (canceled).
12. (original) The assemblage as described in claim 8 wherein at least one of the blanks is formed of a ceramic.
13. (canceled).
30
14. (original) A method of producing dental items, comprising: maintaining an assemblage of "m" mill blanks, the assemblage comprising at least first and second mill blanks each comprising a body adapted to be shaped by material removal, wherein the body of the first blank has a geometry that differs from the body of the second blanlc by other than scaling; for a given restoration R being designed, selecting a subset {Bi, B2, ...B„) of "n" blanlcs, where n < m, such that each of the blanks of the subset contain the restoration R; and selecting a given one of the blanlcs of the subset for use in producing the restoration.
15. (original) The method of claim 14 wherein the given one of the blanks that is selected has the smallest volume.
16. (currently amended) The method of claim 14 wherein the given one of the blanlcs that is selected has a minimal volume difference with respect to the given restoration R being designed.
17. (original) The method of claim 14 wherein the body of at least one of the mill blanlcs in the assemblage has at most one symmetric plane.
18. (original) The method of claim 14 wherein the dental item is prepared by milling the selected blank.
19. (original) The method as described in claim 18 wherein the selected blankd using a computer-assisted milling machine.
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Classifications
International ClassificationA61C13/00
Cooperative ClassificationA61C13/0022, A61C13/0004, A61C5/77
European ClassificationA61C13/00C5, A61C13/00C1
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