IADR Abstract Archives
Effects of Curing on Mechanical Properties of 3D-Printed Crown Materials
Objectives: To investigate the influence of post curing parameters on mechanical properties of additive manufactured definitive crown prosthetic materials.
Methods: Resin-based bars (2x2x25mm) and discs (2xΦ15mm) from Rodin Titan, Rodin Sculpture 2, Sprintray Ceramic Crown, and Vareosmile Bego TriniQ resins were made following the manufacturer’s guidelines for printing designing, cleaning, and curing using the Asiga Max 3D printer. With each resin, three different post-processing techniques were applied to both bars and discs; Otoflash without Nitrogen with 4,500 flashes, Otoflash with Nitrogen 4,500 flashes, and Otoflash without Nitrogen 4,500 flashes with additional cure in oven at 100 °C for 15 minutes. After fabrication, all bars underwent a standard finishing process by grinding with 30 µm,18 µm, and 15 µm sandpaper using a Buehler EcoMet 250 Grinder-Polisher ending with a 9 µm diamond suspension. The specimens are incubated in water at 37 °C for 7 days, then tested for flexural strength and modulus with printed bars and surface hardness with printed discs. Flexural strength was tested using three-point bend test following ISO 10477 for polymer-based crowns. The bars are loaded to failure using an Instron 5566A at a crosshead speed of 1.0 mm/min. Surface hardness was tested using Micromet VH101 microhardness tester using a diamond Vickers indenter with 25 grams of load for 15 seconds. Comparisons of flexural strength, flexural modulus and Vickers Hardness Number (HVN) were analyzed using a two-way ANOVA test.
Results: The results of flexural strength, flexural modulus and hardness are shown in Table 1.
Conclusions: Material type significantly effects flexural strength and modulus, and the interaction of material type and curing method effects hardness. Curing method does not affect flexural strength or modulus in the materials studied but do have an interaction with materials on hardness.
Methods: Resin-based bars (2x2x25mm) and discs (2xΦ15mm) from Rodin Titan, Rodin Sculpture 2, Sprintray Ceramic Crown, and Vareosmile Bego TriniQ resins were made following the manufacturer’s guidelines for printing designing, cleaning, and curing using the Asiga Max 3D printer. With each resin, three different post-processing techniques were applied to both bars and discs; Otoflash without Nitrogen with 4,500 flashes, Otoflash with Nitrogen 4,500 flashes, and Otoflash without Nitrogen 4,500 flashes with additional cure in oven at 100 °C for 15 minutes. After fabrication, all bars underwent a standard finishing process by grinding with 30 µm,18 µm, and 15 µm sandpaper using a Buehler EcoMet 250 Grinder-Polisher ending with a 9 µm diamond suspension. The specimens are incubated in water at 37 °C for 7 days, then tested for flexural strength and modulus with printed bars and surface hardness with printed discs. Flexural strength was tested using three-point bend test following ISO 10477 for polymer-based crowns. The bars are loaded to failure using an Instron 5566A at a crosshead speed of 1.0 mm/min. Surface hardness was tested using Micromet VH101 microhardness tester using a diamond Vickers indenter with 25 grams of load for 15 seconds. Comparisons of flexural strength, flexural modulus and Vickers Hardness Number (HVN) were analyzed using a two-way ANOVA test.
Results: The results of flexural strength, flexural modulus and hardness are shown in Table 1.
Conclusions: Material type significantly effects flexural strength and modulus, and the interaction of material type and curing method effects hardness. Curing method does not affect flexural strength or modulus in the materials studied but do have an interaction with materials on hardness.
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