 The aim of this study was to investigate how the mechanical properties of three different calcium silicate-based cements affect the stress distribution of three different retrograde cavity preparations. Biodentine BD, MTA Biorep BR, and Wellroot PTWR were used. The compression strengths of 10 cylindrical samples of each material were tested. The porosity of each cement was investigated by using microcomputed ax-ray tomography. Finite element analysis, FEA, was used to simulate three retrograde conical cavity preparations with an apical diameter of 1 mm, tip i, 1.4 mm, tip 2, and 1.8 mm, tip 3, after an apical 3 mm resection. BR demonstrated the lowest compression strength values, 17.6 plus or minus 5.5 MPa, and porosity percentages, 0.57 plus or minus 0.14 percent compared to BD, 80 plus or minus 17 MPa, 1.22 plus or minus 0.31 percent, and WR, 90 plus or minus 22 MPa, 1.9. This article was authored by Tarek Ashi, Rafael Richard, Davide Mencino, and others. We are article.tv, links in the description below.