Effect of artificial toothbrushing on wear, surface roughness and hardness of additively manufactured and milled resin-based restorative materials: an in vitro study

Abstract Background Recently introduced milled and 3D-printed resin dental restorations are designed for long-term use. They must endure the mechanical stresses of chewing in the oral environment. This study aimed to evaluate the effect of artificial toothbrushing on wear, surface roughness and hardness of additive-manufactured and milled ceramic filled resin restorative materials. Materials and methods Thirty bar-shaped specimens (15 mm x 4 mm x 1.5 mm) were divided into three groups ( n = 10):