Marginal fit and surface roughness of crowns made with an accelerated casting technique

A Comparative Evaluation of Conventional Vs Accelerated Casting Technique, as Regards Marginal Fit and Surface Roughness

“…Part-I-Determination of marginal discrepancy of complete crown casting made with conventional and accelerated casting method A stainless steel master die was fabricated to make standardized wax pattern crowns as per the study of Konstantoulakis et al (1998) [2] ( fig.1). The master die simulated a crown preparation with 10-degree total axial wall taper.…”

“…One end of the sprue was attached to the pattern at an angle of 90°. The point of attachment was flared as per the study of Konstantoulakis et al (1998) [2] To minimize distortion, each wax pattern was invested with Phosphate bonded investment (Deguvest: Dentsply, India Pvt.Ltd.) immediately after all measurements were completed.…”

“…Only bench setting times were different for both the techniques. For conventional casting technique, it was 30 minutes and for accelerated casting technique, it was 15 minutes; according to Konstantoulakis et al (1998) [2] and Krishna Mohana T. et al (2009) [3]. After investing, the invested ring was kept at room temperature.…”

“…Heat soak times at 815°C were based on the manufacturers' recommendations. The invested ring for the accelerated technique was placed in an 815°C preheated oven for 15 minutes as per the study of Konstantoulakis et al (1998) [2] All casting procedures were performed in an Induction Casting Machine (Ducatron). Two ingots of a nickel chromium ceramometal alloy (ME Alloy) (Dentsply:India Pvt Ltd.) were used for each casting.…”

“…The Accelerated Casting Technique has been attempted in an effort to achieve similar quality results in 30 -40 minutes which is significantly time -saving [2] . Hence, this invitro study was employed to evaluate the resultant casting qualities, in both conventional and accelerated casting technique.…”