Local enforcement of accuracy in fabricated models
The systems and methods disclosed herein employ a combination of digital three-dimensional modeling and rapid fabrication technologies to provide pre-indexed, pre-registered, and/or precut components for articulated dental models. Dental articulators and components of dental models as described herein use a positioning key to encode positional information for components of the dental model, and/or a reference grid on mounting surfaces to enforce local accuracy of fabricated parts against a fixed reference array.
1. A method comprising:
acquiring a digital surface representation of one or more intraoral structures;
processing the digital surface representation to obtain a three-dimensional digital model including a plurality of separate components for at least one arch of the one or more intraoral structures, each one of the plurality of separate components including a mechanical registration feature to orient the component in a dental articulator having a predetermined alignment geometry and at least one of the plurality of separate components including a die for a dental restoration to be placed on a tooth in the one or more intraoral structures prepared for the dental restoration, wherein the plurality of separate components have a correct orientation within the dental articulator according to the predetermined alignment geometry to physically reproduce the one or more intraoral structures; and
fabricating the three-dimensional digital model as a dental model including the plurality of separate components; and
assembling the plurality of separate components onto the dental articulator according to the predetermined alignment geometry.
2. The method of claim 1 wherein the mechanical registration feature includes a reference grid.
3. The method of claim 2 wherein the reference grid includes a regular geometry having centers spaced at a pitch of less than 3 mm.
4. The method of claim 2 wherein the reference grid includes an irregular geometry having a feature size of less than 3 mm.
5. The method of claim 1 wherein the mechanical registration feature includes a positioning key.
6. The method of claim 5 wherein the positioning key provides tactile feedback during assembly of the dental model onto the dental articulator.
7. The method of claim 1 wherein the three-dimensional digital model includes one or more visual markings corresponding to one or more other visual markings on the dental articulator.
8. The method of claim 1 wherein fabricating the three-dimensional digital model includes fabricating at least one of the plurality of components with digital light processing.
9. The method of claim 1 wherein fabricating the three-dimensional digital model includes fabricating at least one of the plurality of components with one or more of stereo-lithography, three-dimensional printing, and computerized milling.
10. The method of claim 1 wherein processing the digital surface representation includes creating a digital model of at least one die.
11. The method of claim 1 wherein the three-dimensional digital model includes a plurality of components, each one of the plurality of components including a reference grid corresponding to the mounting surface of the dental articulator.