[Transverse deflection study of casted titanium zirconium alloy for dental clinic use].
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 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.


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.


CONCLUSIONS
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.
Zhang
Y
Y
Stomatological College, Fourth Military Medical University.
Guo
T
T
Wang
B
B
Li
Z
Z
D003722:Dental Alloys / Q000737:chemistry*; D003735:Dental Casting Technique; D003819:Denture Bases / Q000592:standards*; D018583:Pliability; D012016:Reference Values; D014025:Titanium; D015040:Zirconium
D003722:Dental Alloys; D015040:Zirconium; D014025:Titanium