%0 Journal Article
%T Effect of re-casting on release of elements from one base metal alloy
%A Farshad Bajoghli
%A Ehsan Ghasemi
%A Amir Yazdani
%J Journal of Isfahan Dental School
%D 2012
%I Isfahan University of Medical Sciences
%X Introduction: Toxicity of dental alloys depends on their composition and element release, which may, in turn, be affected by re-casting of the alloy. The aim of this study was to evaluate the effect of re-casting on the release of elements from Verabond base metal alloy.Materials and Methods: In this laboratory study Verabond base metal alloy was evaluated. At first cubic wax patterns measuring 11¡Á13¡Á1.4 mm were prepared. Then alloy disks were cast as follows: 100% new alloy; 50% new with 50% re-cast alloy; and 100% re-cast alloy. Each alloy specimen was finished and polished under simulated clinical conditions and sterilized in an autoclave. Each specimen was conditioned in artificial saliva at 37¡ãC for 72 hours. The specimens were retrieved from artificial saliva and release of elements from the alloys was investigated by Atomic Absorption Spectrophotometry. Data was analyzed by one-way ANOVA and a post hoc Tukey test (¦Á = 0.05).Results: ANOVA revealed significant differences between the cast and re-cast Verabond groups; release of titanium, nickel, aluminum and chloride were respectively higher in recast alloys compared to cast alloys (p value < 0.05). The amounts of Be, Mo, Co were not quantified by spectrophotometry due to their low concentrations.Conclusion: Based on the results of the present study, re-casting of alloys significantly increases the release of elements. Therefore, re-casting of alloys should be avoided. Key words: Artificial saliva, Atomic Emission spectrophotometry, Dental casting alloy.
%K Key words: Artificial saliva
%K Atomic Emission spectrophotometry
%K Dental casting alloy.
%U http://www.jids.mui.ac.ir/index.php/jids/article/view/451