Study on the application of Ti-alloy for denture base

本课题的研究结果如下：1。采用超塑性成形法制备的Ti-6Al-4V合金板的抗弯强度与相同厚度的Co-Cr合金浇铸板的抗弯强度相当，带槽或曲率的板的抗弯强度高于普通板。超塑性钛合金义齿基托的力学性能及适应性采用0.55mm厚的板材进行超塑性成形制作的义齿基托，在硬金属板上加载时，其强度低于Co-Cr合金铸造基托。通过部分或完全扩散结合Ti-6Al-4V合金板，增加基托厚度，使基托强度大于Co-Cr合金基托强度。树脂牙合环，所有义齿基托均为。钢筋。此外，在残余脊腭区覆盖橡胶的母模上加载时，薄基与厚基之间的应变差变小。2 .超塑成型义齿基托具有较高的适应性，基托与母模之间的平均间距小于0.13mm，增加基托厚度可以防止树脂固化义齿后的适应性恶化。采用超塑钛合金基托修复上全口义齿的临床观察29例，植牙1 ~ 3年，中间树脂断裂2例，末端树脂轻度松动7例。

The results obtained from this research project are as follows ;1. Bending behavior of superplastic Ti-alloy for denture baseThe bending strength of the Ti-6Al-4V alloy plate made by superplastic forming was as strong as that of the Co-Cr alloy casting plate with the same thickness, and the plate with channel or curvature was higher than that of the plain plate.2. Mechanical property and adaptability of superplastic Ti-alloy denture baseThe strength of the denture base made by superplastic forming using the 0.55mm thickness plate was lower than that of the Co-Cr alloy casting base, when loaded on the hard metal board. By increasing the thickness by partial or full diffusion bonding of two Ti-6Al-4V alloy plates, the denture base became stronger than the Co-Cr alloy base. With resin occlusal rims, all the denture bases were. -reinforced. Moreover, when loaded on the mastermodel covered with rubber on the residual ridge and palate area, the difference of the strain between the thin and the thick bases became small.The superplastic forming denture base showed a high adaptability with the space less than 0.13mm on average between the base and the mastermodel, and increasing the thickness of the base prevented the worsening of the adaptability after curing resin for the denture.3. Clinical observation of the upper complete dentures with the superplastic Ti-alloy denture baseTwo cases showed fracture of the resin in the middle and 7 showed slight looseness of the resin in the finishing line of the dentures, among 29 cases examined after 1 - 3 years of insertion.