Abstract:
Background: complete denture is the most commonly used treatment plane for edentulous patients, many denture wearers complain from denture retention. Various materials have been used as a denture base to improve denture retention and denture base flexural strength. Nanoparticles was discovered that its inclusion as a reinforcing agent influences the physical properties of acrylic resins. Aim of the study: this comparative in-vitro study was carried out to compare the retention of maxillary denture using three different denture bas material. Material and methods: total number of 18 denture base was fabricated (six conventional base, six nylon denture base and six modified PMMA denture base), retention of the maxillary dentures was measured before and after thermocycling, 30 rectangular specimens were fabricated from each material for flexural strength test. Data ware calculated, tabulated and statically analyzed. Results: significant differences appeared between both polyamide and modified PMMA in comparison to conventional PMMA in both retention and flexural strength .conclusion: modification of PMMA with nano zirconia nano filler improved both fracture resistance and retention of denture bases.