Zhang Y, Guo T, Wang B, Li Z
Stomatological College, Fourth Military Medical University.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2001 Jun;19(3):181-3.
The aim of this study was to obtain the reasonable thickness of Ti-Zr alloy used for denture base material.
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 degrees C, which were made of zircon (ZrO2.SiO2) 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.
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.
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.
本研究旨在获得用于义齿基托材料的钛锆合金的合理厚度。
根据“义齿基托聚合物的ADA第12号修订规范”，对铸造后的钛锆合金进行横向挠曲试验。以纯钛、Ti-6Al-4V合金和钴铬合金作为对照。设计三组不同厚度的蜡型。将钛锆合金、纯钛和Ti-6Al-4V合金在300℃下铸入由锆英石（ZrO2.SiO2）包埋材料制成的铸模中，使用一台铸造机（中国产），采用真空、加压和离心铸造程序。钴铬合金在临床采用常规方法铸造。使用横向试验机测量这四种合金铸件在三种不同厚度下的横向挠曲度。
当钛锆合金、纯钛和Ti-6Al-4V合金的厚度为0.65mm，钴铬合金的厚度为0.57mm时，横向挠曲度可满足要求。
横向挠曲是评估牙科材料承受咬合力能力的关键指标之一。用作义齿基托材料的钛锆合金的合理厚度为0.65mm。
