Evaluation of Marginal Gap of Ni-Cr Based Base Metal Alloys and the Clinical Acceptability of Single Castings Invested in Phosphate Bonded Investment with the Use of Conventional and Accelerated Casting Techniques: An In-Vitro Study

S. Parithimar Kalaignan; N. Shanmuga Nathan; Syed Ali Peeran

doi:10.51984/stmmh741

Authors

S. Parithimar Kalaignan Department of Prosthodontics, Sri Ramachandra Dental College, Sri Ramachandra University, Chennai, India
N. Shanmuga Nathan Department of Prosthodontics, Sri Ramachandra Dental College, Sri Ramachandra University, Chennai, India
Syed Ali Peeran Department of Prosthodontics, Vinayaka Missions University, Salem, India

DOI:

https://doi.org/10.51984/stmmh741

Keywords:

Marginal gap, Base metal alloys, Ni-Cr alloys, Accelerated casting technique, Phosphate-bonded investment

Abstract

Objectives: This Study evaluated the marginal gap of Ni-Cr based base metal alloys (RemaniumCse &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 methods: 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 stone dies were measured with a stereomicroscope equipped with reticule scale at 4X magnification.

Results: Measurements revealed that, mean values for the marginal gap of cast metal crowns casted with accelerated casting technique were 34.5 microns for Remanium CSe and 43.5 microns for wiron 99 and marginal gap of cast metal crowns casted with conventional casting technique mean values were 34 microns for Remanium CSe and 39 microns 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.

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