THE EFFECT OF ADDING NANOPARTICLES ON THE MECHANICAL PROPERTIES OF ACRYLIC REMOVABLE DENTURE

Polymeric materials have begun to play an important role in biological applications and applications related to human life. Present work deals with two different types of fillers used in reinforced polymethylmethacrylic PMMA. Zirconium oxide nanoparticles and hydroxyapatite nanomaterial as a reinforcement agent with weight loading percent 1%, 2%, 3%, 4% and 5% were used to study the effect of these particles on mechanical properties of removable denture. Some laboratory tests were performed according to standard test methods and all results were discussed. Polymethylmethacrylic showed improvement as a result to add Zirconium oxide nanoparticles and hydroxyapatite nanomaterial, especially at weight loading percent 4 wt % in most mechanical laboratory test comparing with standard polymethylmethacrylic without additives. The tensile strength increased with the increasing of the proportion of Zirconium oxide nanoparticles and hydroxyapatite nanomaterial from 18.11 MPa for pure sample to 23.67 MPa and 20.53 MPa at 4 wt % respectively. The compression strength increased with the increasing of the proportion of Zirconium oxide nanoparticles and hydroxyapatite nanomaterial from 5.62 MPa for pure sample to 8.46 MPa and 9.4 MPa for 4wt% respectively. Also, the hardness increased with the increasing of the proportion of Zirconium oxide nanoparticles till 88.7 HBR at 5144 %, while reach to 78.3 HBR with hydroxyapatite nanomaterial comparing with standard sample with 74 HBR at 0 wt %. The impact strength showed same behavior and all these results may be related to the nature of these particles and its behavior during agglomerates and aggregates and its ability to make a good crosslinking with polymer chains. The numerical solution by ANSYS V.16 show the region of strain concentration and response of these structures.