THE EFFECT OF PATTERN MATERIALS ON THE MARGINAL GAP OF METAL COPINGS – AN IN-VITRO STUDY

Dr. Samarth Kumar Agarwal, Dr. Romil Singhal, *Dr. Shivangi Gupta, Dr. Basobi Bezborah and Dr. Vinay Rana

ABSTRACT

Introduction: Accurate marginal seating and internal fit of cast restorations are crucial to meet the biological, physical, and aesthetic requirements of a successful restoration. Considering these factors, the present study aimed to evaluate and compare the marginal adaptation of cast copings made using inlay wax, pattern resin, and autopolymerized pattern resin, each invested at different time intervals. Objective: The study aims at evaluating and assessing the marginal adaptation of three different pattern with the objective of determining the pattern material with less discrepancy. Methodology: A replica abutment resembling a prepared mandibular premolar was created. An impression of the prepared premolar was taken, and 30 type IV gypsum dies were produced. Patterns made of three different materials were fabricated and casting was done. The evaluation of marginal adaptation was conducted using stereo microscope. All collected data was statistically analyzed using one-way ANOVA test. Result: The findings indicated a significant statistical variance in the marginal adaptation among the three materials. Light-cured wax consistently demonstrated the highest accuracy, followed by thermoplastic resin and inlay casting wax. Conclusion: The marginal adaptation of the three materials tested showed marginal gap within the range of 25–70 μm which is in clinically acceptable span.

Keywords: Marginal adaptation, inlay wax, light cure wax, autopolymerising resin, pattern material.