INVESTIGATION OF MECHANICAL PROPERTIES OF PMMA COMPOSITE REINFORCED WITH DIFFERENT TYPES OF NATURAL POWDERS

Poly Methyl Methacrylate were widely accepted material in dental and medical field due to the excellent biocompatibility and easy fabrication, however exhibit inferior mechanical properties. In current research, two groups of PMMA nano composites samples were fabricated by using hand lay-up method at laboratory temperature used for manufacturing of the maxillary complete or partial denture base. These samples consist of poly methyl methacrylate (PMMA) resin as a matrix material, was strengthen by two different natural powder in nanometresize (pomegranate peels (PPP) and seed powder of dates Ajwa (SPDA)) in individually form, with selected weight fraction ratio (0, 0.4, 0.8, 1.2 & 1.6 wt. %).Some mechanical properties and analytical physical properties (FTIR, SEM) were investigated. The result showed a considerably improvement in the values of these properties for both groups of bio composite specimens comparing with neat PMMA. All bio composite specimens reinforced with pomegranate peels powder in nanometre size showed the highest properties as compared with the bio composite specimens strengthened by nano seed powder of dates ajwa. The highest value of flexural strength, flexural modulus, max. shear stress, impact strength and fracture toughness were 114MPa, 5.124GPa, 3.562MPa, 13.75KJ/m² and 8.276 MPA.m½ respectively, for bio composite specimens reinforced with pomegranate peels powder, while for bio composite specimen reinforced with seed powder of dates Ajwa 105MPa, 4.187GPa, 3.316MPa, 10KJ/m² and 6.389 MPA.m½ respectively. On the basis of these results, it can be conclusion that the addition of natural fillings nanoparticles (pomegranate peels powder and seed powder of dates ajwa) to bio PMMA material, is one of the promising materials in use to improve the strength of fracture to the base of dental kit