Comparative Evaluation of Dimensional Accuracy of Casting (Vertical Marginal Discrepancy) Produced with Supercast and Minalux Alloys
Document Type : Original Articles
Authors
1 Associate Professor, Dental Material Research Center, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
2 Associate Professor, Dental Implant Research Center, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
3 DDS Dental Material Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
4 Postgraduate Student of Maxillofacial Radiology, Department of Maxillofacial Surgery, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
5 Assistant Professor, Department of Prosthodontics, School of Dentistry, Shahrekord University of Medical Sciences, Shahrekord, Iran.
Abstract
Materials & Methods: In this experimental/observational study, 60 coping wax patterns were fabricated on a metal die which was prepared for porcelain-fused metal crown (PFM) with chamfer finishing line and divided into 2 groups of 30. In the first group, Supercast alloy and in the second group Minalux alloy were used. Castings were prepared and seated on the metal die after minimal internal surface adjustment. The vertical margin discrepancies were measured at four locations (buccal, lingual, mesial and distal) of the die and casting. Then the vertical margin discrepancy in each group was statistically analyzed with SPSS 22, using t-test (α = 0.05).
Results: Mean vertical margin discrepancy in first group (Supercast alloy) was 117.35 µm, with 137.57 µm in the second group (Minalux alloy). The castings with Supercast alloy were significantly different (p value = 0.031) from the Minalux alloys.
Conclusion: The results show that the Supercast alloy, due to lower vertical marginal discrepancy compared to Minalux, is better for fabrication of dental restorations.
Key words: Dental alloy, Dental margin adaptation, Nickel-chromium alloys.
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