Effect of post curing different temperatures on 3D denture hardness printed by DLP and LCD 3D printers effect of different temperatures on 3D denture hardness printed by DLP and LCD 3D printers
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Abstract
Post-curing temperature plays a vital role in enhancing the mechanical
properties of denture base resins fabricated using 3D printing technologies such as Digital Light Processing (DLP) and Liquid Crystal Display (LCD) printers. In this study, the surface hardness of denture base specimens was evaluated following post-curing treatments at 60°C and 80°C. The results demonstrated that increasing the post-curing temperature significantly improved the hardness of samples from both printer types. DLP-printed samples showed greater improvements in hardness compared to LCD-printed samples across both temperature ranges. This difference is due to the higher energy exposure and more efficient photopolymerization of DLP systems. Both the LCD and DLP groups performed significantly better in hardness at 60°C compared to the control group. This indicates improved polymer bonding. Post-curing at 80°C produced the highest hardness values, particularly for the DLP group, suggesting that higher temperatures may help form denser polymer networks. Despite these benefits, it is important to take precautions to prevent material degradation or stress at higher processing temperatures. The results suggest that post-curing 3D-printed denture bases at 80°C may increase their surface hardness. Furthermore, DLP-produced materials perform better mechanically than LCD-printed ones.
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