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This study investigated the marginal adaptation of three recently introduced bioceramic root repair materials, EdgeBioCeramic RetroFill, Endocem MTA, and One-Fil PT, using VP-SEM analysis. Extracted single-rooted lower incisors were used to simulate retrograde fillings. The results showed no statistically significant differences in the marginal gap between the materials and the dentin walls. All three materials exhibited good dimensional stability, with gap sizes comparable to previously published research on similar materials. The mean GAP was 3.91 ± 2.56 for EdgeBioCeramic RetroFill, 4.32 ± 2.69 for Endocem MTA, and 4.50 ± 2.54 for One-Fil PT. This study employed VP-SEM, a valuable tool for analyzing bioceramic materials without altering their properties. The findings suggest the possibility of daily clinical use of these bioceramics by endodontists and general practitioners that could find applications in retrograde fillings and perforation repairs. However, further in vivo studies are needed to confirm long-term stability and assess the influence of sample preparation methods.