Partial dentures by centrifugal casting assisted by additive manufacturing

Abstract

This research work focuses on preparation of partial dentures (as functional prototypes) by additive manufacturing (AM)-assisted centrifugal casting (CC). The master pattern for partial dentures was prepared on fused deposition modelling (FDM) set-up (established by AM technique at low cost). The final dentures as functional prototypes were prepared with a nickel-chromium (Ni-Cr)-based alloy by varying different proportions of Ni% (N) by weight %. The other input parameters were powder to water P/W ratio (W) and pH value (H) of water used for mixing the investment. The samples prepared were ascertained for dimensional deviation (Dd), surface finish (R a ) and micro-hardness (HV) as output parameters. Finally, multifactor optimization has been applied on output parameters of functional prototypes prepared. This study highlights that partial denture prepared with W-100/15, H-7 and N-61% gives overall better results from mechanical properties and dimensional accuracy viewpoint. The results are also supported by photo-micrographic analysis.

Investigations for partial denture casting by fused deposition modelling-assisted chemical vapour smoothing

“…The examined average grain size number of Experiment Number 3 for photomicrograph (Figure 9) is 4.25 and for photomicrograph of Experiment Number 8 is 6.00 as per ASTM E1382. The more grains per unit area have higher grain size number (Singh and Ranjan, 2018 (Singh et al, 2014;Singh and Singh, 2015;Singh et al, , 2019.…”

“…Recent studies proposed that sea water and double distilled water with higher X ratio (commercially recommended) have significant effects on hardness, setting time, surface finish and compressive strength for preparing dentures (Ahn et al, 2012;Jayaprakash et al, 2014;Niekawa et al, 2017). The reported literature reveals that FDM process has inherently issues of R a and Dd (Singh et al, 2019(Singh et al, , 2020. But even with these issues, this process has established itself as one of the most economical, easy to operate AM technique.…”

A comparative study on investment casting of dental crowns for veterinary dentistry by using ABS patterns with and without wax coating

“…Different types of wax are mainly aliphatic compounds having straight chain carbon atoms, whereas the resins and fillers are aromatic compounds having ring structured carbon atoms. The structure and composition of these compound determine key qualities such as hardness, viscosity, melting point, rheological features, congealing point, rate of expansion, contraction and setting [8,9]. Based on application, wax can be termed as runner wax, pattern wax, reconstituted reclaim wax, water soluble wax and special wax (for minute repair and finishing).…”