Study on the application of Ti-alloy for denture base

本研究取得的主要成果如下：1.义齿基托用超塑性钛合金的弯曲性能超塑成形Ti-6Al-4V合金板的弯曲强度与同厚度的Co-Cr合金铸板相当，而有沟槽或弯曲的钛合金板的弯曲强度高于普通钛合金板.超塑钛合金基托的力学性能与适应性0.55mm厚板材超塑成形基托的强度低于钴铬合金铸造基托。通过部分或完全扩散连接两块Ti-6Al-4V合金板来增加厚度，义齿基托的强度比Co-Cr合金基托高。所有义齿基托均采用树脂垫。- 加强。超塑成形义齿基托与主模之间的间隙平均小于0.13mm，具有良好的适应性，且基托与主模之间的应变差小于0.13mm。增加基托的厚度可以防止义齿树脂固化后适应性的恶化.超塑钛合金基托上颌全口义齿的临床观察29例患者，戴义齿1 ~ 3年后复查，2例树脂在义齿中部断裂，7例树脂在终饰线处轻度松动。

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.