Improvement of the accuracy of titanum denture plate obtained by digital dental process using new incremental forming technology

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We have applied the incremental forming process to fabrication of denture plate. Denture plate is a important dental prosthetic component of complete denture, which equips a set of artificial teeth and fits the palate in oral cavity. Denture plate is, therefore, a custom-made component and pure titanium is excellent biocompatible material. Almost all titanium denture plates are currently made by the lost wax method. Incremental forming has the potential to replace the conventional process. This new process, however, posed difficult problems about poor seizure resistance. In order to improve the surface quality, anodic oxide film was examined. The examination provided the optimum condition in which the surface roughness was minimized.When carbide tool and molybdenum disulfide paste were used, seizure occurred in the incremental forming operation of pure titanium due to high reactivity with tool material. Although copper alloy is effective in the conventional forming operation of titaniu … More m sheet, the forming stylus made of the alloy was greatly worn out. In this research, the oxide film formed by anodizing was evaluated in the incremental forming process. The thick anodic oxide film resulted in good surface finish, but reproducible sliding marks were produced in closed whitish belt-shaped region.The effect of tangential feed rate on the surface roughness was examined systematically The shape used was truncated cone with apex angle double theta. The surface roughness has minimum value near the tangential feed rate 0.15. The increase in feed rate increased the surface-roughness from the tangential feed rate is 0.2 to 1 mm/rev. The decrease in feed rate increases the surface-roughness from the tangential feed rate is 0.1 to 0.01 mm/rev. Tool mark is dominant over the former increase of roughness, while the later is dominated by the damage caused by repeated sliding. The surface of denture plate, which was formed at optimum vertical feed rate, had smooth and burnished surface without seizure and sliding mark. Less