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

我们已将渐进成形工艺应用于义齿板的制作。义齿托板是全口义齿中重要的义齿修复体部件，它用来装备一组义齿，使其与口腔内的腭部相吻合。因此，义齿板是一种定制的部件，而纯钛是极好的生物相容性材料。目前几乎所有的钛义齿都是用脱蜡法制作的。渐进成形具有取代传统工艺的潜力。然而，这一新过程带来了抗癫痫发作能力差的难题。为了提高表面质量，对阳极氧化膜进行了检测。结果表明，当采用硬质合金刀具和二硫化钼浆料时，由于与刀具材料的高反应性，纯钛在增量成形过程中会发生卡滞现象。虽然铜合金在传统的钛…成形工艺中是有效的板材较多时，该合金的成形针头磨损严重。在本研究中，在渐进成形过程中对阳极氧化形成的氧化膜进行了评估。较厚的阳极氧化膜表面光洁度较好，但在闭合的白色带状区域会产生可重复的滑动痕迹。系统研究了切向进给速度对表面粗糙度的影响。表面粗糙度在切向进给速率0.15附近有最小值。进给速度的增加使表面粗糙度从切向进给速度增加到0.2~1 mm/Rev.随着进给速度的降低，表面粗糙度从切向进给速度从0.1 mm/Rev.1增加到0.01 mm/Rev.刀具痕迹对前者的增加起主导作用，而后者则以反复滑动造成的损伤为主.以最佳垂直进给速度成形的义齿托板表面光滑、光滑，无卡环和滑移痕迹。较少

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