comparative evaluation of the effect of silicone and teflon in prevention of epidural fibrosis after laminectomy in rat

there are many studies about epidural fibrosis after surgical manipulation of the spine. we have studied formation of the post laminectomy epidural fibrosis after application of two materials (silicone and teflon) in this report. this expriment is on two groups of rats. two separated laminectomies were done in each rat, one serving as control while in the other laminectomy spaces silicone was used in group a and teflon in group b. laminectomy spaces were evaluated with gross dissection and histologic studies after 6 weeks. silicone decreased intermuscular scar, deep scar, dural adhesion and collagen fiber density in epidural space. teflon decreased dural adhesion and collagen fiber density but did not decrease intermuscular and deep scar formation in epidural space.