Effect of glycerol-assisted ultraviolet postcuring duration on residual monomer release from 3D-printed denture base resins

Aim: The widespread use of printable resins contrasts with the limited evaluation of residual monomer release, that remains a significant concern for biocompatibility. Fewer studies estimated the monomer releases in printable denture base resins. The study evaluated the effect of glycerol-assisted UV post-curing at different time intervals on residual monomer release from 3D printed denture base resin. Study Setting and Design: Invitro experimental study. Materials and Methodology: Forty standardized specimens of 50 mm diameter × 3 ± 0.1 mm thickness were made using a DLP 3D printer in accordance with ISO 20795-1:2013 specifications. Following printing and ethanol washing, specimens were immersed in glycerol and subjected to UV post-curing at 0, 10, 20, and 30 minutes. Residual methyl methacrylate (MMA) release was measured by means of high-performance liquid chromatography (HPLC), and values were compared across groups. Statistical Analysis: Kruskal–Wallis test and Dunn’s post hoc test with Bonferroni corrections. Results: Reduction in MMA release was observed with increasing post-curing duration ( P < 0.001). Mean values decreased progressively from 26.68 ppm (0 min) to 7.78 ppm (30 min), with the 30-minute group demonstrating the lowest monomer elution. Conclusion: Glycerol-assisted UV post-curing significantly reduced residual monomer release. A 30-minute curing duration appears optimal for improving polymerization and enhancing biocompatibility.