On multi-factor optimisation of Ni-Cr-based partial dentures by centrifugal casting

ABSTRACT

The conventional centrifugal casting of Ni-Cr (N)-based alloys is commercially established process for the preparation of partial/complete dentures. But hitherto little has been reported on the multi-factor optimisation of N-based alloys in conventional centrifugal casting. This study concentrates on preparation of N-based partial dentures by using lost wax technique in different proportions (by weight %) of Ni (R) as an input parameter. The other input parameters were investment powder to water ratio (P) and pH value (Q) of water used (for mixing the investment). The samples prepared were subjected to measurement of dimensional deviation/accuracy (Δd), surface roughness (R_a) and micro hardness (HV). Finally, after obtaining required properties, multi-factor optimisation has been performed. The results are supported by optical photomicrographs (2D and 3D rendered images). The results of study highlight that N-based partial denture cast at best settings of input parameters (i.e. P (100/12), Q (pH 7) of water with R (61%) gives overall better performance and in-vitro analysis indicates that the partial dentures cast with R (65%) showed the maximum biocompatibility with NIH3T3 cells and are capable of supporting cell proliferation and cell adhesion.

KEYWORDS:

• Ni-Cr alloy
• pH value
• partial denture
• powder to water ratio
• conventional centrifugal casting
• in-vitro analysis

Acknowledgments

The authors would like to thank Manufacturing Research Lab (Production Engineering, GNDEC Ludhiana) for this research work.

Disclosure statement

No potential conflict of interest was reported by the authors.