Evaluation and comparison of the porosities in the acrylic mandibular denture bases processed by two different curing cycles, using two different brands of commercially available denture base resins – An in vitro study

Purpose: This study evaluated and compared the amount of porosities in two different acrylic materials processed by two different curing cycles. Materials and Methods: A total of 200 mandibular edentulous master casts were fabricated by using a standard silicone mold. These casts were divided into two groups with 100 samples for each group and each group was divided into two subgroups with 50 samples depending on the curing cycles. On the master cast, a wax pattern was fabricated with 2 mm of thickness and processed by conventional flasking method to obtain the mandibular master specimen. This master specimen along with the master cast was flasked and mold space was created for the placement of test specimens. All these samples were subjected to curing cycles along with the test specimens followed by porosity analysis of the specimens. Results: ANOVA analysis inferred that there is a statistically significant difference between the mean porosity values between the groups. Conclusion: Analysis of mean porosity of all groups reveals that heat-polymerized specimens of Dental Products of India (DPI) processed with a long curing cycle have lesser mean percent porosity values.