denture base
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            impact strength
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            polymerized polymethyl methacrylate particles
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            polymethyl methacrylate resin
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            surface hardness
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            surface roughness
                                                        
                                                                                                                                                                                                                                                                                                            
                                                            zirconia
                                                        
                                                                                                            
                                                            zirconium oxide
                                                        
                                                                                                                                                                                         
                                                                        
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                                        Introduction: This study was designed to examine the effects of addition of the combination of polymerized polymethyl methacrylate
(PMMA) and zirconia (ZrO2) particles to heat cure PMMA resin on impact strength, surface hardness, and roughness. Methods: The 70%
(w/w) of polymerized PMMA powder (particle size: 0.70mm) was mixed with 30% (w/w) of zirconia powder (ZrO2) (1mm) to produce
PMMA-ZrO2 filler. Ninety acrylic specimens created were divided into three groups containing 0% wt (Control group), 2% wt, and 4% wt,
PMMA-ZrO2 filler. Ten specimens were used for impact strength, surface hardness and roughness test, blindly. Data were analyzed via oneway ANOVA and the Tukey post hoc test using R 3.6.3. Results: There was statistically signific
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