Mockup representing a dental arch including analogs approximating orthodontic brackets and method of making the mockup
A method of making a physical mockup the method comprises the steps of providing a virtual dental arch, a virtual set of orthodontic brackets for the virtual dental arch and a virtual set of analogs. Each analog is associated with a virtual bracket of the virtual set of brackets and the shape of at least one of the analogs differs from the shape of the associated bracket. The method further comprises the steps of providing a virtual mockup in which the virtual dental arch and the set of virtual analogs are merged, and manufacturing the physical mockup based on the virtual mockup. The physical mockup represents a shape composed of the shape the dental arch and the shape of the set of analogs. The invention facilitates bonding of brackets to a patent's teeth.
1. A method of making a physical mockup representing a shape composed of the positive shape of a patient's dental arch and the positive shape of a set of analogs, the method comprising the steps of:
providing a virtual dental arch replicating at least part of the patient's dental arch;
providing a virtual set of orthodontic brackets for the virtual dental arch;
providing a virtual set of analogs, each virtual analog of the virtual set of analogs being associated with a virtual bracket of the virtual set of brackets, wherein one or more of the virtual analogs approximate the shapes of their associated virtual brackets;
modifying the shape of at least one virtual bracket to form at least one of the virtual analogs by reducing or eliminating in the one virtual analog an undercut formed by the one virtual bracket;
providing a virtual mockup in which the virtual dental arch and the set of virtual analogs are merged; and
manufacturing the physical mockup based on the virtual mockup.
2. The method of claim 1 , further comprising the step of positioning the virtual brackets relative to the virtual dental arch.
3. The method of claim 1 , wherein the modifying step comprises increasing a three-dimensional volume represented by the virtual bracket by selectively modifying only a portion of the virtual bracket.
4. The method of claim 1 , wherein the modifying step comprises reducing a three-dimensional volume represented by the virtual bracket by selectively modifying only a portion of the virtual bracket.
5. The method of claim 1 , wherein the physical mockup is manufactured by additive manufacturing.
6. The method of claim 1 , further comprising the step of providing a transfer tray for the set of virtual brackets through physically replicating the negative shape of at least part of the physical mockup.
7. The method of claim 6 , comprising the steps of:
providing an elastic sheeting on the physical mockup to cover at least part of the tooth side of the mockup by the sheeting;
providing a plastic sheeting on the mockup with the elastic sheeting arranged between the plastic sheeting and the mockup;
deforming the plastic sheeting over the mockup such that it tightly encloses at least the tooth side of the mockup with the elastic sheeting embraced between the plastic sheeting and the mockup;
replacing the elastic sheeting by a hardenable liquid or pasty material; and
allowing the hardenable material to harden.
8. The method of claim 7 , wherein the hardenable material is selected from among a rubber material, silicone material, alginate material and a dental impression material.
9. The method of claim 6 , wherein the transfer tray replicates the negative shape of only part of the physical mockup.
10. The method of claim 6 , further comprising the step of placing one or more physical brackets in respective one or more receptacles, wherein each receptacle corresponds to the negative shape of a virtual analog associated with the physical bracket.