Evaluation of the flexural strength, elastic modulus and deformation of different pmma-based materials

Abstract

Objective: To evaluate the flexural strength (FS), elastic modulus (E), and strain (S) of different PMMA-based materials.

Materials and methods: Six prismatic 25x2x2 mm specimens were made using: PMMA Disc (Sagemax) (PD), A-Splint (Amman Girrbach) (AS), CopraTemp ML (Whitepeaks) (CT) for machining, and Vaicron (Vaicril) (VA) for heat curing. In all cases, the materials were used according to the manufacturer's instructions. The flexural strength was determined, according to ISO 4049 and elastic modulus was obtained, and flexural strain was determined according to ASTM D790. The tests were performed on a universal mechanical testing machine (INSTRON 5985) at room temperature (23 ± 2 °C) at a speed of 0.75 mm/min. The specimen dimensions were verified with a 0.02 mm analog caliper. The data were analyzed using a one-way ANOVA.

Results: Regarding FS and E, the three CAD/CAM materials behaved homogeneously, with no statistically significant differences among them.  In the heat-cured material, the values for both properties were significantly lower (p<0.01). Deformation was significantly higher in the CAD/CAM materials (p<0.01).

Conclusion: Within the framework of this study, it can be stated that the PMMA-based machining materials evaluated behaved homogeneously with respect to the variables analyzed. Their behaviour was slightly better compared to the heat-cured one. UBACYT 20720220200020BA