Dental articulator with positioning key
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 dental articulator comprising:
a dental model fabricated using a rapid fabrication facility;
a first arm formed with a high accuracy injection molding process having an accuracy substantially greater than the rapid fabrication facility, the first arm having a first mounting surface, the first mounting surface including a first raised surface including a first reference grid having features with centers spaced apart less than 5 mm, and the first mounting surface including at least one positioning key structurally separate from the first reference grid adapted to receive a component of the dental model in a specific location in the first mounting surface and to provide gross tactile feedback on proper alignment of the component during an assembly of the component onto the dental articulator; and
a second arm formed with the high accuracy injection molding process, the second arm rotatably engaged to the first arm, the second arm having a second mounting surface rotatable into opposition with the first mounting surface.
2. The dental articulator of claim 1 wherein the second mounting surface includes a second raised surface having a second reference grid adapted to receive one or more components of the dental model in a predetermined orientation.
3. The dental articulator of claim 1 wherein the second arm is detachably engaged to the first arm.
4. The dental articulator of claim 1 wherein the first arm and the second arm are constructed from polyphenylsulfone.
5. The dental articulator of claim 1 wherein the first reference grid includes features with centers spaced at between 0.5 mm and 5 mm.
6. The dental articulator of claim 1 further comprising a plurality of positioning keys each adapted to receive one of a plurality of components of the dental model in a different position within the first mounting surface.
7. The dental articulator of claim l wherein the positioning key includes an orthogonal line pair.
8. The dental articulator of claim 1 wherein the positioning key includes an alignment post.
9. The dental articulator of claim 1 wherein the positioning key includes a number of alignment guides.
10. The dental articulator of claim 1 wherein the positioning key includes visual markings.
11. The dental articulator of claim 1 wherein the reference grid includes a regular geometry having centers spaced at a pitch of less than 3 mm.
12. The dental articulator of claim 1 wherein the reference grid includes an irregular geometry having a feature size of less than 3 mm.
13. The dental articulator of claim 1 further comprising one or more visual markings corresponding to one or more corresponding visual markings on the dental model.
14. The dental articulator of claim 1 wherein the rapid fabrication facility uses one or more of computerized milling, stereolithography, digital light processing, three-dimensional printing, selective laser sintering, fused deposition modeling, and laminated object manufacturing.