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Composites play a pivotal role in a myriad of industries, including aerospace, automotive, household, marine, and medical sectors. The continual refinement of composite synthesis is paramount for optimizing their mechanical and physical attributes. This study explores the specific realm of dental applications, investigating the influence of calcite-zincate nanoparticles (CZNPs) at concentrations of 0, 0.2, 0.6, and 1.0% within Poly Methyl Methacrylate (PMMA) resin. Additionally, this research considers the synergistic effects of calcium carbonate, calcite, and zinc oxide in conjunction with CZNPs. The primary objective is a comprehensive assessment of mechanical properties, specifically focusing on flexural strength, tensile strength, and impact strength. Specimens are compared both with and without calcite-zincate nanoparticles, employing the open die method for self-polymerizing PMMA. Subsequently, detailed examination was carried out using scanning electron microscopy (SEM) to provide microscopic insights into the material's structure and composition. The outcomes of this research reveal a notable improvement in mechanical properties for specimens incorporating calcite-zincate nanoparticles (CZNPs) compared to those devoid of such reinforcement. Flexural strength, tensile strength, and impact strength are observed to be positively affected by CZNPs. This enhancement positions the composite as a promising option for applications in tooth restoration and prosthetics within the field of dentistry, showcasing the potential practical significance of incorporating CZNPs in PMMA resin formulations.