Casting processes are probably the most common method for producing titanium dental devices. These manufacturing techniques have to be tailored with reference to the peculiarities of titanium and its alloys. In fact, on the one hand, the high melting points of such materials make it necessary to use very efficient melting systems and suitable casting methods in order to compensate for the high viscosity of the melt. On the other hand, because of the high chemical reactivity between titanium and oxygen processes must be carried out in a vacuum or under inert gas. A significant support in designing these casting processes and in evaluating the quality of the cast component is now offered by numerical simulation techniques. In fact, computational codes have recently been introduced which able to calculate the mass, velocity, momentum and temperature fields established during all the stages of the casting process once the boundary and initial conditions have been correctly defined. This chapter initially presents a review of the metallurgical features of titanium alloys and the casting technologies usually used for producing dental devices, followed by an explanation of the potential of process simulation applied to this field. Then, with reference to the titanium grade 2 cast framework, the fluid dynamics and thermal fields induced during manufacturing are presented to simulate the evolution of the process. Finally, the results of the thermal field calculation are shown. These results can be related to the microstructural evolution of the device and to its metallurgical quality. Since the microstructure is directly correlated to the mechanical properties, as is the case in all metallic materials, the output of process simulation can be used to carry out a biomechanical evaluation of the component.

Dental devices in Titanium-based materials via casting route

NATALI, ARTURO;BONOLLO, FRANCO;PAVAN, PIERO
2003

Abstract

Casting processes are probably the most common method for producing titanium dental devices. These manufacturing techniques have to be tailored with reference to the peculiarities of titanium and its alloys. In fact, on the one hand, the high melting points of such materials make it necessary to use very efficient melting systems and suitable casting methods in order to compensate for the high viscosity of the melt. On the other hand, because of the high chemical reactivity between titanium and oxygen processes must be carried out in a vacuum or under inert gas. A significant support in designing these casting processes and in evaluating the quality of the cast component is now offered by numerical simulation techniques. In fact, computational codes have recently been introduced which able to calculate the mass, velocity, momentum and temperature fields established during all the stages of the casting process once the boundary and initial conditions have been correctly defined. This chapter initially presents a review of the metallurgical features of titanium alloys and the casting technologies usually used for producing dental devices, followed by an explanation of the potential of process simulation applied to this field. Then, with reference to the titanium grade 2 cast framework, the fluid dynamics and thermal fields induced during manufacturing are presented to simulate the evolution of the process. Finally, the results of the thermal field calculation are shown. These results can be related to the microstructural evolution of the device and to its metallurgical quality. Since the microstructure is directly correlated to the mechanical properties, as is the case in all metallic materials, the output of process simulation can be used to carry out a biomechanical evaluation of the component.
Dental Biomechanics
0415306663
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11577/2454627
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