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

将增量成形工艺应用于义齿钢板的制造。义齿板是全口义齿的重要牙体修复部件，它装备一套义齿，将上颚固定在口腔内。因此，义齿板是一种定制的部件，纯钛是一种极好的生物相容性材料。目前几乎所有的钛义齿板都是用失蜡法制作的。增量成形有可能取代传统的成形工艺。然而，这种新工艺带来了抗癫痫性差的难题。为了提高表面质量，对阳极氧化膜进行了检测。该试验提供了使表面粗糙度最小化的最佳条件。当使用硬质合金刀具和二硫化钼膏体时，由于纯钛与刀具材料的高反应性，在增量成形过程中发生了卡顿现象。虽然铜合金在钛板的常规成形操作中是有效的，但铜合金制成的成形针磨损严重。本研究对渐进式成形过程中阳极氧化形成的氧化膜进行了评价。厚的阳极氧化膜使表面光洁度良好，但在封闭的白色带状区域产生可再现的滑动痕迹。系统地研究了切向进给速度对表面粗糙度的影响，采用顶点角为双θ的截锥形状。在切向进给速度为0.15时，表面粗糙度最小。切向进给量的增加使表面粗糙度增加0.2 ~ 1 mm/rev。切向进给量的减小使表面粗糙度增大0.1 ~ 0.01 mm/rev。刀具刻痕以粗糙度增加为主，而刀具刻痕以反复滑动造成的损伤为主。在最佳垂直进给速度下成形的义齿板表面光滑、光洁，无卡扣和滑痕。少

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