An experimental material, mineral trioxide aggregate (MTA)was developed
in loma linda university.it is a mixture of portland cement and bismuth
oxide mainly.MTA has numerous applications in filed of endodontics and
restorative dentistry such as perforation repai, root end filling
material, pulp capping agent n obturating material,
apexification.Several in vitro and in vivo studies have shown that MTA
prevents microleakage, is biocompatible, and promotes regeneration of
the original tissues when it is placed in contact with the dental pulp
or periradicular tissu