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An in vitro evaluation of effect of different concentrations of polyhedral oligomeric silsesquioxane nanofiller on flexural strength of denture base resin

Author: 
Jaykumar Gade, Neha Khodaskar and Vandana Gade
Subject Area: 
Health Sciences
Abstract: 

Purpose: The purpose of this study was to evaluate the effect of three different concentrations (1wt%, 3wt % and 5wt %) of MA-POSS (methacryl polyhedral oligomeric silsesquioxane) on flexural strength of heat cured denture base resin (PMMA). Material and Methods: Total 40 test specimens were made of heat cured denture base resin (DPI, Dental Products of India) with dimensions of 65 mm x 10 mm x 3 mm. Methacryl POSS (MA-POSS) was added in 1wt%, 3wt% and 5 wt% concentrations by physically blending in polymer matrix. All the specimens were stored in artificial saliva at 370 C for 10 days in a universal incubator and tested in universal testing machine at cross head speed of 0.5mm/min. Results: The mean flexural strength of control group specimens was 72.25 Mpa which increased to 85.17 Mpa on reinforcement with 1 wt % POSS and further increased to 99.85 Mpa on reinforcement with 3 wt% POSS. However the flexural strength declined to 50.45 Mpa on reinforcement with 5wt% POSS Conclusion: Concentration of POSS upto 3 wt % improved flexural strength of denture base resin however when concentration increased to 5 wt % the strength decreased drastically.

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