Histopathological evaluation of the tissue reactions to Endo-Fill root canal sealant and filling material in rats.

In this in vivo study, the tissue reactions to silicone-based Endo-Fill root canal filling material were histopathologically evaluated. The reaction of rat connective tissue to polyethylene tube implants that were filled with Endo-Fill were evaluated at 2 days, at 1, 2, 4, and 8 weeks. Four tube were implanted in each rat subcutaneously, and a total of 15 rats were used. Rats were killed, and the specimens were examined under the light microscope (x115 and x230). At the end of 8 wk, a thin fibrous wall with an almost completed advanced healing process was observed around the implant material, but no capsule formation or any inflammatory infiltration was seen.