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Several materials and methods have been used for ceramometal crown fabrication. Marginal fit and surface roughness are two important elements in the accuracy of casting. Conventional Technique requires 2-4 hours for completion of casting. Accelerated Technique has been attempted in an effort to achieve similar quality results in 30 – 40 minutes which is significantly time – saving. The purpose of the present study was to evaluate the marginal fit and surface roughness by comparing above two techniques. Methodology: Part I of the study determined marginal fit of base ceramometal crowns with the use of phosphate bonded investment. In the conventional technique, the temperature was raised at a rate of 8°C per minute up to 427°C where it was held for 1 1 /2 hour. A rate of 14°C per minute was used for the second cycle up to 815°C whereas; the invested ring for the accelerated technique was placed in an 815°C preheated furnace immediately after setting of investment, for 15 minutes . Part II evaluated surface roughness of casting made with same techniques as Part I. Results And Conclusion: No statistically significant variation in the marginal discrepancy and surface roughness was observed in all the four quadrants between accelerated and conventional casting techniques. Accelerated technique was found to be definitely a time saving procedure for the dentist and the lab technician as compared to conventional technique.

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