The effect of addition of hydroxyapatite microscopic fillers on surface roughness and some mechanical properties of heat cured acrylic resin

Abstract

Background: this study aimed to evaluate the effect of addition of hydroxyapatite micro filler in three concentrations(5%, 10%, 15%) on surface roughness, impact strength, flexural strength and hardness.Material and methods: One hundred sixty acrylic samples were used in this study,40 samples were used for eachtest(impact strength ,flexural strength ,hardness and surface roughness).The test group divided into foursubgroups(n=10) for controlgroup,5%,10% ,15%H,A.concentration addition groups .Impact testing device, flexuralstrength testing device, shore hardness tester and profilometer device were used to measure the four tests examinedin this study.Results: the results showed a significant increase in impact strength, hardness in all concentrations added to heatcured acrylic resin, highly significant decrease in flexural strength, a non-significant difference in surface roughnesstest in 5% concentration while there was a significant differences in other two concentration in the same test.Conclusion: the 5% concentration hydroxyapatite addition was the concentration of choice to be used to increasethe mechanical properties (impact strength) of heat cured acrylic resin without increasing the surface roughness ofthe material.