Evaluation of marginal gap of Ni-Cr-based base metal alloys invested in phosphate-bonded investment with the use of conventional and accelerated casting techniques—an in vitro study

Abstract

Objectives This study evaluated the marginal gap of Ni-Cr-based base metal alloys (Remanium CSe & Wiron 99) and the clinical acceptability of single castings invested in phosphate-bonded investment with the use of conventional and accelerated casting techniques. Materials and Method Forty individual stone casts were poured from impression made from master die. Conventional and accelerated method of investing and casting were followed. Twenty casts were used in each of the groups. Each casting and its respective dies were measured with a stereomicroscope equipped with reticule scale at 4× magnification. Results Measurements revealed that mean values for the marginal gap of cast metal crown casted with accelerated casting technique were 34.5 μ for remanium Cse and 43.5 μ for Wiron 99 and marginal gap of cast metal crowns casted with conventional casting technique mean values were 34 μ for Remanium CSe and 39 μ for Wiron 99 base metal alloys. All marginal gap measurements were within the range of clinical acceptability. For the marginal gap, cast metal crowns fabricated with the accelerated casting technique were not significantly (p>0.05) different from those fabricated with the conventional technique. Conclusion The accelerated casting technique described in this study could be a vital alternative to conventional casting technique.