Document Type : Original Article

Authors

1 Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

2 General Dentist, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

3 Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran

4 Dept. of Oral and maxillofacial pathology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

10.30476/dentjods.2021.87573.1275

Abstract

Statement of the Problem: The castability of nonprecious gold color (NPG) alloy using torch/centrifugal and induction/vacuum-pressure casting techniques has not studied yet.
Purpose: This study was conducted to compare the castability of nickel chromium (Ni-Cr), cobalt-chromium (Co-Cr) and nonprecious gold color (NPG) alloy using torch/centrifugal and induction/vacuum-pressure casting techniques
Materials and Method: In this in vitro study total number of 54 identical acrylic wax meshes were prepared and divided into 6 different groups of 9 each. Group 1: nickel-chromium (Ni-Cr) alloy which was casted with induction technique. Group 2: Ni-Cr alloy was casted with centrifugal technique. Group 3: cobalt-chromium (Co-Cr) alloy was casted with induction technique. Group 4: Co-Cr alloy was casted with centrifugal technique. Group 5: nonprecious gold color (NPG) alloy was casted with induction technique. Group 6: NPG alloy was casted with centrifugal technique. Then castability of specimens was measured using modified Whitlock’s method. Results analyzed using two way ANOVA and post hoc tests.
Results: ANOVA test revealed no statistically significant difference between different alloys with a p-value of 0.313. Also, it represented no significant differences within the groups regarding alloy types and casting techniques with a p-value of 0.511 and 0.682, respectively.
Conclusion: No significant difference was found in the castability value of Ni-Cr, Co-Cr, and NPG alloys. Also, the castability value of three alloys tested in this study was not different by using torch/centrifugal or induction/vacuum-pressure casting machines.

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