Abstract
Objectives: the present study was conducted to compare the adaptation accuracy of three different denture base materials for maxillary complete denture; compression molded heat cured polymethyl methacrylate (PMMA), injection molded thermoplastic resin and microwave processed denture base resin.
Materials and Methods: 18 casts were duplicated from a completely edentulous model for the upper arch, then divided equally into three groups: group A (compression molded PMMA), group B (injection molded thermoplastic resin), group C (microwave processed denture base). The dentures on their respective casts were sectioned 5 mm anterior to the posterior border and measurement of the posterior border gap between the denture base and the cast was measured using a traveling microscope at the mid-palatal, right and left crestal regions. The data was collected and statistically analyzed.
Results: the least gap measurement was found in group B at the crestal and mid-palatal sections, while the highest gap measurement was found in group C followed by group A. A statistically significant difference was found between the three groups at the crestal and mid-palatal sections, and between the crestal and mid-palatal measurements within each group.
Conclusion: injection molded thermoplastic resin showed the highest adaptation accuracy as measured by gap distance, followed by compression molded heat cured PMMA and then the microwave processed denture base resin.