Monomer Release from Resin Materials Used in Posterior Crowns Fabricated via Digital and Conventional Techniques: An...

To evaluate resin-based posterior restorative materials by comparing the release of BPA, TEGDMA, HEMA, UDMA, and Bis-GMA monomers at 1 hour, 3 days, and 1 month.

Five different materials were used in this study: Cerasmart (CS), Gradia-Plus Indirect (GI), G-ænial Posterior (GP), Formlabs 3D-Permanent Crown (FPC), and SonicFill 3 (SF). A total of 90 specimens 8 × 8 × 2 mm3 in size were prepared from all the materials. The specimens were immersed in a 75% ethanol/25% water solution and placed in an incubator for 1 hour, 3 days, and 1 month, after which the solutions were analyzed using high-performance liquid chromatography (HPLC). For the comparisons of data with normal distribution among the five different materials, repeated-measures ANOVA followed by Bonferroni post-hoc tests were applied (α = .05).

Except for BPA release in the FPC material, all other materials exhibited an increasing release of monomers over time (P < .001). At all the measured time points, the material with the lowest monomer release was CS, while the highest release was observed in GP. The GI material exhibited the statistically significant highest release of BPA, TEGDMA, and Bis-GMA (P < .001), while the highest UDMA and HEMA release was observed in the GP material (P < .001).

The highest monomer release was observed for UDMA (0.8%) from the GP material at the end of 1 month. However, the monomer release from all examined materials remained well below the clinically acceptable range (1.5% to 5%).