Journal of Prosthodontics News
A Comparative Study of Strength and Surface Properties of Permanent 3D-Printed Resins
Now online in the Journal of Prosthodontics, a study on strength and surface properties of 3D-printed resins, co-authored by ACP Fellow, Nadim Z. Baba, DMD, MSD, FACP.
3D-printed resins for permanent restorations have been developed recently however, studies on their properties are limited. This study evaluated the strength, surface roughness, and hardness of a newly introduced permanent 3D-printed resin in comparison with computer-aided design and computer-aided manufacturing (CAD/CAM) milled materials.
Three 3D-printed resins (NextDent C&B, Formlabs Permanent Crown, and VarseoSmile Crown plus) and two CAD/CAM milled (IPS e.max ZirCAD LT and VITA Enamic) resins were used to fabricate 200 disc specimens. Within each group, half of the specimens were subjected to thermal cycling. Aged and nonaged specimens were evaluated for biaxial flexural strength (BFS), surface roughness, and hardness.
Significant differences (p < 0.05) were observed in the BFS, surface roughness, and hardness between the 3D-printed and milled groups, before and after thermal aging. Permanent 3D-printed resins have lower strength than CAD/CAM milled materials. 3D-printed permanent resin materials exhibited high roughness and comparable hardness to CAD/CAM materials. Thermal aging negatively affected the properties of 3D-printed permanent crowns. Owing to the low strength of 3D-printed permanent resins, they may not be recommended for clinical practice until further improvements in flexural strength are made to meet clinical standards.
Gad MM, Al Mahfoudh HA, Al Mahfuth FA, Hashim KA, Khan SQ, Al-Qarni FD, et al. A comparative study of strength and surface properties of permanent 3D-printed resins with CAD/CAM milled fixed dental prostheses. J Prosthodont. 2024; 1–9. https://doi.org/10.1111/jopr.13990
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