Effect of the Use of Die Lubricant on the Marginal Fit of Wax Patterns.

The aim of this study was to evaluate the effect of die lubricant on the fit of wax patterns. An ivorine tooth was prepared to receive full-coverage metal-ceramic restoration with 360° shoulder finish line. The tooth was duplicated 40 times using additional silicone. The impression was poured with Type IV dental stone. These 40 dies were divided into 2 groups 20 each. Group A: The patterns were fabricated with the use of die lubricant. Group B: The patterns were fabricated without the use of die lubricant. Later, these patterns were sequentially checked for the marginal fit on the stereomicroscope. The readings from the stereomicroscope were tabulated; independent Student's t-test was used to compare the marginal fit between Group A and Group B. The mean gap on all four tooth surfaces in Group A (with use of die lubricant) was more compared to Group B (without use of die lubricant). CONCLUSION: Die lubricant definitely has their effect on fit of the wax pattern which later might be duplicated in the casting.