IADR Abstract Archives
Characterization of 3D-Printed vs. Heat-Polymerizing and Autopolymerizing Denture Base Acrylic Resins
Objectives: To investigate the effect of the post polymerization method on the mechanical and physical properties of a 3D-printed denture base material. Additionally, to compare the mechanical and physical properties of a 3D-printed material with those of conventional heat-polymerizing, and autopolymerizing denture base acrylic resin.
Methods: A resin for 3D printing denture base (Imprimo ®), a heat-polymerizing acrylic resin (Paladon 65), and an autopolymerizing acrylic resin (Palapress) were investigated. Flexural strength, elastic modulus, fracture toughness, work of fracture, water sorption, and water solubility were evaluated. The 3D printed specimens were printed in a horizontal direction with a DLP 3D printer (Asiga MAX™). Two different post polymerization units were used for the 3D printed group (Scheu and Form Cure), and two subgroups were made accordingly. In the Scheu subgroup, the specimens were post polymerized for 3 minutes using LED and nitrogen gas. The specimens of the Form Cure subgroup were post polymerized for 30 minutes at 60°〈C in a light curing unit with LED. The autopolymerizing and heat-polymerizing acrylic resin specimens were fabricated according to the manufacturers’ instructions. Dry and 30 days water-stored samples were investigated in each group for each mechanical/physical property (n=8).
Results: Material and storage conditions had a significant effect on the flexural strength, elastic modulus, fracture toughness, and work of fracture (P< 0.001). Water sorption and water solubility values were significantly different (P<0.05). However, the effect of post polymerization method was significant only for flexural strength and water solubility (P= 0.01 and P <0.001).
Conclusions: An extended post polymerization time seems to have an effect on the mechanical and physical properties of the investigated 3D printed denture base material. The heat-polymerizing denture base material exhibited higher mechanical properties than the 3D printed and autopolymerizing denture base acrylic resin.
Methods: A resin for 3D printing denture base (Imprimo ®), a heat-polymerizing acrylic resin (Paladon 65), and an autopolymerizing acrylic resin (Palapress) were investigated. Flexural strength, elastic modulus, fracture toughness, work of fracture, water sorption, and water solubility were evaluated. The 3D printed specimens were printed in a horizontal direction with a DLP 3D printer (Asiga MAX™). Two different post polymerization units were used for the 3D printed group (Scheu and Form Cure), and two subgroups were made accordingly. In the Scheu subgroup, the specimens were post polymerized for 3 minutes using LED and nitrogen gas. The specimens of the Form Cure subgroup were post polymerized for 30 minutes at 60°〈C in a light curing unit with LED. The autopolymerizing and heat-polymerizing acrylic resin specimens were fabricated according to the manufacturers’ instructions. Dry and 30 days water-stored samples were investigated in each group for each mechanical/physical property (n=8).
Results: Material and storage conditions had a significant effect on the flexural strength, elastic modulus, fracture toughness, and work of fracture (P< 0.001). Water sorption and water solubility values were significantly different (P<0.05). However, the effect of post polymerization method was significant only for flexural strength and water solubility (P= 0.01 and P <0.001).
Conclusions: An extended post polymerization time seems to have an effect on the mechanical and physical properties of the investigated 3D printed denture base material. The heat-polymerizing denture base material exhibited higher mechanical properties than the 3D printed and autopolymerizing denture base acrylic resin.