Flexural Strength and Vickers Microhardness of Graphene-Doped SnO2 Thin-Film-Coated Polymethylmethacrylate after Thermocycling

Removable dental prostheses are commonly fabricated using polymethylmethacrylate, a material that does not have favorable mechanical properties and needs reinforcement with particles such as graphene. The aim of this study was to evaluate the flexural strength (FS) Vickers microhardness heat-polymerized polymethylmethacrylate coated graphene-doped stannic oxide (SnO2) thin films thermionic vacuum arc method after thermocycling. Forty bar-shaped specimens (65 × 10 3 mm) were denture base resin divided into four groups according SnO2 film surface coating performed: No-coat (uncoated), Coat-15 s (coating duration 15 s), Coat-20 20 Coat-30 30 s) (n = 10). used coat both surfaces each test group varying durations, verified Fourier Transform Infrared Spectroscopy. Specimens subjected 10,000 cycles Atomic force microscopy all before Microhardness values measured five times averaged. Then, specimen three-point bending test, FS calculated. Data analyzed one-way analysis variance Bonferroni tests (α 0.05). Differences among nonsignificant when data considered (p 0.605). However, significant differences observed < 0.001). had highest hardness ≤ 0.003), while difference remaining ≥ 0.166). Graphene-doped coatings did significantly affect tested but increased s.