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Title: Method of making crowns and bridges and the occlusal and lingual stamp therefor
Claims: I claim: 1. In the method of making dental crowns and bridges, wherein from a bite simulating articulated master model of the patient's jaws, there has been sliced and separated therefrom a master die of the particular tooth and adjacent jaw requiring a crown or bridge; the following steps: a. marking a contrasting finish line on and around the master die; b. applying a layer of plastic sheet spacing material around said die down to said finish line; and simultaneously c. applying a tooth build up plastic coping or backing over said spacing material; d. trimming said coping at said finish line and simultaneously forming a V-shaped channel around the master die in registry with said finish line; e. reapplying said master die and coping to the master model, first removing said spacing material; f. applying molten wax into the cavity of a preselected metal occlusal stamp, having an occlusal anatomy corresponding to the optimum desired natural shape for that particular tooth, creating a preformed occlusal pattern the depth of the stamp; g. inverting the occlusal pattern while plastic over said coping, while applying axial pressure thereto adhering said pattern to said coping while applying heat thereto; h. and with the unit die, coping and occlusal pattern removed from the master model, applying molten wax to all lateral surfaces of the die from the margin to the occlusal pattern, contouring same to the anatomical shape of a tooth. 2. In the method of maaking dental crowns and bridges of claim 1, said assembly being adapted for the final steps of investing, burning out the wax, and casting with a suitable dental alloy in accordance with the lost wax process. 3. In the method of making dental crowns and bridges of claim 1, the additional step before step (e) of applying a separating agent to the opposing areas of the master model for registry with the waxed crown. 4. In the method of making dental crowns and bridges of claim 1, said spacing material being about 0.025 MM thick. 5. In the method of making dental crowns and briges of claim 1, said coping being built up to a thickness of about 0.060 MM. 6. In the method of making dental crowns and bridges of claim 1, said metal occlusal stamp having a perhiphal margin surrounding its cavity, said stamp being selected from the group of occlusal stamp cavity shapes including lingual anatomy upper central, lingual anatomy lower lateral, occlusal anatomy lower molar, occlusal anatomy upper molar, occlusal anatomy, upper and lower bicuspid molar, and occlusal anatomy upper and lower cuspids. 7. In the method of making dental crowns and bridges of claim 1, said metal occlusal stamp having a raised peripheral margin and a base defining said cavity of predetermined anatomical shape; and a support shaft at one end joined to and projecting axially of said base. 8. In the method of making dental crowns and bridges of claim 7, an annular enlargement upon said shaft intermediate its ends to facilitate manipulation of said stamp for steps (g) and (h). 9. In the method of making dental crowns of claim 1, said finish lines being applied with a red ballpoint pen. 10. In the method of making dental crowns of claim 1, said spacing material being in one or two layers to achieve the maximum fit. 11. In the method of making dental crowns of claim 1, the sides of the master die defining said V-shaped channel being at an angle of about 45.degree.. 12. In the method of making dental crowns of claim 1, after the selection of the predetermined proper occlusal stamp as to size and shape of cavity, the further step before step (f) of applying a separating agent to the cavity surfaces. 13. In the method of making dental crowns and bridges of claim 1, the further step following step (g) of cooling the die, coping and pattern and separating and removing the metal stamp, leaving the wax pattern attached to the coping. 14. In the method of making dental crowns of claim 1, the further step before step (h) of replacing the master die, coping and formed wax pattern into the articulated master model and checking the bite. 15. In the method of making dental crowns of claim 14, the further steps, when the wax pattern is placed out of occlusion, the wrong wax stamp applied, or said stamp is too high or too low, of melting the first applied wax pattern, applying the additional molten wax to the occlusal surface and restamping the crown in accordance with step (g). 16. In the method of making dental crowns of claim 15, the further step before step (h) of manipulating the metal stamp and its formed wax pattern until the best possible occlusion is obtained, with the master die still assembled in the model. 17. An occlusal or lingual stamp for use in the making of dental crowns and bridges comprising: a metallic base having a preformed peripheral margin defining a cavity adapted to receive molten wax when the cavity is positioned to open upwardly, said cavity being of a predetermined shape and occlusal or lingual anatomy corresponding to the optimum desired natural shape and size for a particular tooth of any human mouth, and a shaft of reduced size relative to said base at one end secured to said base and extending axially away from said cavity. 18. In the occlusal and lingual stamp of claim 17, an enlargement upon said shaft intermediate its ends to facilitate manipulation of said stamp. 19. In the occlusal and lingual stamp of claim 17, there being a set of said lingual and occlusal stamps for a particular size of tooth, with each stamp having a different cavity, corresponding respectively to the general anatomical lingual and occlusal shape of all of the teeth of both human jaws. 20. In the method of making dental crowns and bridges, wherein from a bite simulating articulated master model of the patient's jaws, there has been sliced and separated therefrom a master die of the particular tooth and adjacent jaw requiring a crown or bridge; and wherein a contrasting finish line is marked on and around the master die; a plastic coping is applied to the die, trimmed to said finish line and a V-shaped channel is formed around the master die in registry with said finish line; and said master die and coping is reapplied to the master model, the following steps: a. applying molten wax into the cavity of a preselected metal stamp, having a lingual or occlusal anatomy corresponding to the optimum desired natural shape for that particular tooth, creating a preformed occlusal pattern the depth of the stamp; b. inverting the occlusal pattern while plastic over said coping, while applying axial pressure thereto adhering aid pattern to said coping while applying heat thereto; c. and with the unit die, coping and occlusal pattern removed from the master model, applying molten wax to all lateral surfaces of the die from the margin to the occlusal pattern, contouring same to the antomical shape of a tooth. Other info: Inventors: Horger, Jr., Otto A. (Sterling Heights, MI, US) Application Number: 705626 Filing Date: 1976-07-15 Publication_date: 1978-03-14 Assignee: Primary Class(es): 433/213 Other Classes: US Patent Ref:
Other Refs: Primary Examiner: Peshock, Robert Assistant Examiner: Attorney: Cullen, Settle, Sloman & Cantor |
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