Perforation at the middle of the root occur your material of choice to be used.. Mineral trioxide aggregate - MTA Perforation at the middle of the root occur your material of choice to be used: 1. Mineral trioxide aggregate (MTA) *** 2. Amalgam 3. Glass ionomer 4. Calcium hydroxide. Share This: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook