Fabrication of Dental Crowns by Investment Casting with Rapid Freeze Prototyping Generated Ice Patterns
There exists great potential for the wordwide dental replacement market. Currently, dental restorations are mainly made through investment casting using the "lost wax" process, which is one of the most labor intensive aspects of dental treatment. The contour and fit of wax patterns used in this process are tediously created by hand using small instruments and magnification devices. As a result of this, more and more attention is being paid to the automatic fabrication of dental resotrations. Rapid Freeze Prototyping is a solid freeform fabrication method. It can produce complex 3D ice patterns directly from CAD models by selectively depositing and rapidly freezing water droplets layer by layer. The fabricated ice parts can be used as patterns in investment casting to make metal castings. The process of investment casting with ice patterns is described in this paper. The selection of binder and catalyst for the cermamic slurry is discussed, as well as the selection of the interface agent. The accuracy and surface finish of the fabricated metal castings are presented. The fabrication of a simplified dental crown, represented as a cylinder, is used to generate detailed results in this investigation.
Q. Liu and M. Leu, "Fabrication of Dental Crowns by Investment Casting with Rapid Freeze Prototyping Generated Ice Patterns," Medical Device materials - Proceedings of the Materials and Processes for medical Devices Conference 2003, ASM International, Jan 2003.
Materials and Processes for medical devices Conference 2003
Mechanical and Aerospace Engineering
Keywords and Phrases
Binders; Casting; Catalysts; Computer Aided Design; Computerized Tomography; Contour Measurement; Dentistry; Magnetic Resonance Imaging; Medical Imaging; Metal Casting; Restoration; Slurries
Article - Conference proceedings
© 2003 ASM International, All rights reserved.
01 Jan 2003