In Vitro Evaluation of Mechanical Properties of Acrylic Resins Subjected to Different Cleaning Methods for Removable Complete Dentures

Abstract Objective Test in vitro mechanical properties of different types of acrylic resins used for the manufacture of removable full prostheses used in different cleaning methods. Methods Acrylic resin were exposed specimens to mechanical and/or chemical cleaning methods, and their mechanical properties, surface roughness and flexural strength, were analyzed. Therefore, the samples were divided: Thermo polymerizable resin subjected to the mechanical hygiene method (brushing cycles), thermo polymerizable resin using the mechanical hygiene method and chemical (immersion with 1% hypochlorite), digital resin - printed from PMMA resin used with a mechanical hygiene method, subgroup digital resin - printed from PMMA using a mechanical hygiene method and chemical, digital resin- milled subjected to the method of mechanical hygiene, and digital resin - milled used with a mechanical hygiene method and chemical. Results The mechanical and chemical hygiene process showed significantly lower values for flexural modulus, flexural strength, and breaking load compared to the mechanical process in the three acrylic resins studied. Following the mechanical hygiene method, the flexural modulus was significantly higher for compacted resin compared to the others. For the mechanical and chemical hygiene process, the flexural modulus was significantly higher for thermo polymerizable resin than for the other two resins. Conclusions After performing both mechanical and mechanical-chemical hygiene methods, the average and maximum roughness were significantly lower in the thermopolymerizable resin. Printed and compacted digital acrylic resins obtained statistically significant results in terms of flexural compared to a thermopolymerizable resin when subjected to hygiene processes.