A Comparative Evaluation Of Marginal And Internal Adaptation Of Complete Cast Coping Fabricated Using Different Pattern Materials -An In Vitro Study

Objective: The present laboratory study was carried out to compare and evaluate the marginal fit and internal adaptation accuracy for the complete cast crowns fabricated using Inlay wax, light cured wax and pattern resin.Materials and Method: The pattern materials compared in the present study were conventional Inlay wax, Light Curing and Pattern resin. The castings were fabricated using the lost wax technique. The marginal fit and internal adaptation of uncemented complete cast crowns were assessed with the help of a stereo microscope and then subjected to image analysis. The scanned results were analyzed at five different points for each casting. Three readings at each point were taken and their average was recorded.Results: The mean marginal and internal discrepancy of the castings fabricated using the Inlay wax was the least. The mean marginal and internal discrepancy of the castings fabricated using the Light Cured Wax was the highest. The castings fabricated using the Pattern Resin had better marginal and internal accuracy than the castings fabricated using Light Cured Wax. However, the castings fabricated using the Light-cured wax was inferior in terms of marginal and internal accuracy compared to the castings fabricated using the Inlay wax.Conclusion: Considering the various aspects of the present study, it is concluded that with strict adherence to the principles of pattern fabrication, Inlay wax can still be the pattern material of choice to produce a casting with minimal marginal and internal discrepancy which is user friendly and cost effective.