Method of making dental restorations from sintered preforms
AssigneeJames R. Glidewell Dental Ceramics, Inc.
InventorsDavid Leeson, Marco A. Jokada, Vaheh Golestanian Nemargrdi, Hossein Madanipour
Life of this patent
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Abstract
A method is provided for shaping a custom dental restoration from a preform, wherein the preform comprises a preform body and a preform stem. A method is further disclosed for generating one or more nesting positions for the restoration design within the geometry of the preform body relative to the position of the preform stem. A method is further disclosed for generating machining instructions based on the selected nesting position to optimize machining for chair-side applications.
Claims20
A method for making a dental restoration from a machinable preform, comprising:
- obtaining a 3D CAD file of a dental restoration design and a computer model of a preform, wherein the preform comprises a preform body and a preform stem that projects from an outer surface of the preform body at a stem contact point;
- nesting the dental restoration design within the computer model of the preform body by identifying at least two nesting options, wherein the location of the stem contact point relative to the dental restoration design is different for the at least two nesting options, and selecting one of the at least two nesting options;
- generating machining instructions for shaping the dental restoration from the preform based on the selected nesting option;
- and
- machining the machinable preform into a final dental restoration in less than 1 hour of machining time, wherein the machinable preform comprises a material having a Vickers hardness value in the range of HV 4 GPa to HV 20 GPa.
A method for making a dental restoration from a machinable preform comprising material shaded to achieve a color of natural dentition in a final dental restoration comprising:
- obtaining a 3D CAD file of a dental restoration design and a computer model of a preform, wherein the preform comprises a preform body comprising a preform stem that projects from an outer surface of the preform body at a stem contact point,
- nesting the dental restoration design within the computer model of the preform body by identifying at least a first nesting option wherein the stem contact point is at a mesio-buccal position relative to the dental restoration design, and at least a second nesting option wherein the stem contact point is at a disto-buccal position relative to the dental restoration design, and selecting one of the two nesting options;
- generating machining instructions for shaping the dental restoration from the preform based on the selected nesting option;
- and
- machining a machinable preform into a final dental restoration in less than 1 hour of machining time, wherein the machinable preform comprises a material having a Vickers hardness value in the range of HV 4 GPa to HV 20 GPa.
Dependencies are inferred from the claim text.