A schematic depicting the classification of endodontic monoblocks. In a primary monoblock, there is only one interface between the root filling material and the root dentin. In a secondary monoblock, there are two interfaces, one between the fiber post/root filling material and the cement/root canal sealer, and the other between the cement/root canal sealer and the root dentin. In a tertiary monoblock, a third interface is created when a bondable coating is present on the surface of the fiber post/root filling material.