Evaluation the Tensile Bond Strength of Acrylic Teeth After Reinforcement the Denture Base by ZnO Nanofillers Materials

Abstract

Acrylic teeth are chemically bond to the denture base materialand are easier to adjust so that preferable on porcelain teethbut the most de bounding between teeth and denture baseoccur inside the patient mouth during function when thecontact area between teeth and denture base was exposed totensile strength. The Aim of this study: evaluate the tensilebond strength of acrylic teeth after reinforcement the denturebase after addition (ZnO) nanofillers materials to PMMAwith different concentrations(2%, 4%, and 6%).Materials andmethods: Forty specimens of heat cure acrylic resin (PMMA)were prepared and divided into four groups 10 specimens foreach groups as follows; Control Group (Group1) without ZnOnanofillers particles ; Group (2) with 2% by weight of ZnO ;Group (3) with 4% by weight of ZnO and Group (4) with 6%by weight of ZnO, wax pattern sample which used for acryliccylindrical shape fabrication were (25 mm in length and 5mmin diameter ,the base of the cylinder which is 5mm inthickness and 8mm in length). Tensile bond strength of allspecimens was evaluated. Results: showed the highest meanvalue was recorded by PMMA+ZnO 2% (6.4093) while thelowest mean value was recorded by PMMA+ ZnO 6%(3.9824). Conclusions: There were significant differencebetween control group PMMA and (PMMA+ZnO 4%, andPMMA+ZnO 6%) and there was no significant differencebetween control group PMMA and PMMA+Zno 2%