IADR Abstract Archives
Studying the Effect of Curing Time on the Properties of 3D Printed Denture Base Material
Objectives: This study aims to evaluate the effect of post-curing time on the mechanical and physical properties of 3D printed denture base specimens.
Methods: 45 samples were printed using NextDent resin material in a Formlabs printer and divided into 3 groups with either 20 min, 30 min, or 50 min post-curing times. Flexural strength, and surface hardness, of the printed specimens were characterised.
Results: The mean values of flexural strength (± SD) were recorded as 48.24 ± 4.99 MPa, 56.62 ±3.87, and 56.79 ± 3.88 MPa for 20 min, 30 min, and 50 min curing time respectively. On the other hand, the mean values of surface hardness (± SD) were measured as 10.74 ± 0.88 Kg/mm2, 12.99 ± 1.13 Kg/mm2, and 12.83 ± 1.04 Kg/mm2 for 20 min, 30 min, and 50 min respectively. The results indicated that after 30 mins of curing time, the hardness and flexural strength of the specimens did not change significantly. However, a significant improvement in the flexural strength and a slight improvement in the surface hardness were found when the curing time was increased from 20 min to 30 min.
The water sorption results will be added once the experiment is finished.
Conclusions: It can be concluded that 30 min post-curing should be considered as the minimum time needed to fully cure the specimens and any further curing would be irrelevant. This was in line with the recommendations from the material manufacturer.
Methods: 45 samples were printed using NextDent resin material in a Formlabs printer and divided into 3 groups with either 20 min, 30 min, or 50 min post-curing times. Flexural strength, and surface hardness, of the printed specimens were characterised.
Results: The mean values of flexural strength (± SD) were recorded as 48.24 ± 4.99 MPa, 56.62 ±3.87, and 56.79 ± 3.88 MPa for 20 min, 30 min, and 50 min curing time respectively. On the other hand, the mean values of surface hardness (± SD) were measured as 10.74 ± 0.88 Kg/mm2, 12.99 ± 1.13 Kg/mm2, and 12.83 ± 1.04 Kg/mm2 for 20 min, 30 min, and 50 min respectively. The results indicated that after 30 mins of curing time, the hardness and flexural strength of the specimens did not change significantly. However, a significant improvement in the flexural strength and a slight improvement in the surface hardness were found when the curing time was increased from 20 min to 30 min.
The water sorption results will be added once the experiment is finished.
Conclusions: It can be concluded that 30 min post-curing should be considered as the minimum time needed to fully cure the specimens and any further curing would be irrelevant. This was in line with the recommendations from the material manufacturer.