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A system for repositioning teeth comprises a plurality of individual appliances. The appliances are configured to be placed successively on the patient's teeth and to incrementally reposition the teeth from an initial tooth arrangement, through a plurality of intermediate tooth arrangements, and to

A system for repositioning teeth comprises a plurality of individual appliances. The appliances are configured to be placed successively on the patient's teeth and to incrementally reposition the teeth from an initial tooth arrangement, through a plurality of intermediate tooth arrangements, and to a final tooth arrangement. The system of appliances is usually configured at the outset of treatment so that the patient may progress through treatment without the need to have the treating professional perform each successive step in the procedure.

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1. A method of fabricating a plurality of dental incremental position adjustment appliances, said method comprising: providing a plurality of positive models of successive tooth arrangements, wherein each successive arrangement represents a different geometry representing a successive stage progr

1. A method of fabricating a plurality of dental incremental position adjustment appliances, said method comprising: providing a plurality of positive models of successive tooth arrangements, wherein each successive arrangement represents a different geometry representing a successive stage progressing from an initial tooth arrangement to an intermediate or a final tooth arrangement; and fabricating the plurality of dental appliances as negatives of the positive models at one time. 2. A method as in claim 1, wherein providing said positive models comprises: providing digital data representing said plurality of successive tooth arrangements; and controlling a fabrication machine to produce said plurality of positive models of successive tooth arrangements. 3. A method as in claim 2, wherein providing digital data comprises producing a plurality of digital data sets, wherein each set represents one of the successive tooth arrangements. 4. A method as in claim 3, wherein controlling the fabrication machine comprises: providing a volume of non-hardened polymeric resin; and scanning a laser to selectively harden the resin in a shape corresponding to each of the positive models. 5. A method as in claim 2, wherein controlling the fabrication machine comprises: providing a volume of non-hardened polymeric resin; and scanning a laser to selectively harden the resin in a shape corresponding to each of the positive models. 6. A method as in claim 1, wherein producing the dental appliances comprises molding a thin polymeric sheet over each of the positive models to produce a plurality of thin polymeric shells. 7. A method of fabricating a plurality of dental incremental position adjustment appliances, said method comprising: providing digital data representing said plurality of successive tooth arrangements, wherein each successive arrangement represents a stage progressing from an initial tooth arrangement to an intermediate or a final tooth arrangement; controlling a fabrication machine to produce a plurality of positive models of successive tooth arrangements; and fabricating the plurality of dental appliances as negatives of the positive models. 8. A method as in claim 7, wherein providing digital data comprises producing a plurality of digital data sets, wherein each set represents one of the successive tooth arrangements. 9. A method as in claim 8, wherein controlling the fabrication machine comprises: providing a volume of non-hardened polymeric resin; and scanning a laser to selectively harden the resin in a shape corresponding to each of the positive models. 10. A method as in claim 7, wherein controlling the fabrication machine comprises: providing a volume of non-hardened polymeric resin; and scanning a laser to selectively harden the resin in a shape corresponding to each of the positive models. 11. A method as in claim 7, wherein producing the dental appliances comprises molding a thin polymeric sheet over each of the positive models to produce a plurality of thin polymeric shells.