Fig. 1

A schematic representation of the procedure used in this study. A mixture of OSTE+ was shaped into blocks using a PDMS mold. The OSTE+ material was formed by a two-step polymerization process: first a UV-initiated step (exposure time of 40 min) followed by a heat-initiated step in which the samples were placed in an oven at 65 °C overnight. Half of the samples were placed in water for a week, allowing eventual unreacted constituents to leak out. Extractions were made by placing a sample of each material into a vial with water and the vial was then gently shaken at 37 °C for 72 h. The extractions were then used in chemical analysis and biological assays