牙科用Ti-Zr合金铸造后挠度的研究

Transverse Deflection Study of Casted Titanium Zicornium Alloy for Dental Clinic Use

目的 :研究Ti_Zr合金铸造后的挠度 ,为选择Ti_Zr合金临床应用的合理厚度提供依据。方法 :参照美国ADA关于义齿基托树脂材料挠度的标准 ,测量不同厚度的Ti_Zr合金的挠度 ,并对Ti及Ti_6Al_4V合金以及临床常用的Co_Cr合金进行对比研究。结果 :Ti_Zr合金、纯钛及Ti_6Al_4V合金在厚度为 0 6 5mm左右时能够达到义齿基托挠度的标准。钴铬合金在 0 5 7mm左右即可达到标准要求。结论 :临床制做Ti_Zr合金基托时 ,厚度应选择 0 6

Objective:The aim of this study was to obtain the reasonable thickness of Ti_Zr alloy used for denture base material.Methods:According to the “Revised ADA Specification No.12 for denture base polymers', the transverse deflection tests of Ti_Zr alloy after casting were performed. Pure titanium, Ti_6Al_4V alloy and Co_Cr alloy were examined as the control. Three groups of wax patterns with different thickness were designed. Ti_Zr alloy, pure titanium and Ti_6Al_4V alloy were casted into molds at 300℃, which were made of zircon (ZrO\-2.SiO\-2) investment, using a casting machine (China), with a program of vacuum, pressure and centrifuge casting. Co_Cr alloy was casted by normal method in clinic. The transverse deflections of these four alloys castings with three different thicknesses were measured using a transverse testing machine.Results:When the thickness is 0.65 mm for Ti_Zr alloy, pure titanium and Ti_6Al_4V alloy, and 0.57 mm for Co_Cr alloy, the transverse deflections could satisfy the requirement.Conclusion:The transverse deflection is one of the key indexes for evaluating the ability of dental material to bear biting forces. The reasonable thickness of Ti_Zr alloy used as denture base material is 0.65 mm.