Comparative Evaluation Of Impact Strength Of Two Denture Base Resins Under Two Processing Techniques By Incorporating Titanium Dioxide Nanoparticles In 1.5 W/W% And 3.5 W/W% – An In Vitro Study

Abstract

Introduction- Conventional heat cure acrylic resin has a chain of PMMA where as in high impact denture base resins, the PMMA in the polymer are substituted with a copolymer with styrene or methyl methacrylate and are incorporated into the beads. TiO₂ is one of the most preferred nanoparticles to be incorporated in the acrylic resin to enhance the modulus, strength and ductility of the resin.⁴

Objective- -The purpose of the study was to check the effective processing technique and optimum percentage of TiO₂ to improve the impact strength of the acrylic resin when incorporated in different weights by percentage and three different processing techniques.

Method- 360 samples were prepared from heat cure resin and were divided into 12 groups. The samples for each group were tested for impact strength. Impact strength Test was conducted by the ISO 179 IZOD Type Impact Testing Machine.

Results - The result of the study stated that -When compared with same processing technique that is in acrylizer but incorporated with 1.5w/w% and 3.5w/w% respectively, the impact strength was found higher in first group with 1.5w/w% incorporation.

Conclusion-There is a highly significant increase in the impact strength of heat polymerized PMMA  denture base samples reinforced with 1.5 w/w% and 3.5 w/w % titanium dioxide nanoparticles processed in acrylizer, when compared with Heat polymerized PMMA denture base material processed in pressure pot.