ABSTRACT
Teeth that require endodontic treatment are often severely broken down and can be vulnerable to fracture; they often require extensive (and expensive) restoration following root canal treatment. A high fracture rate has been found in root-filled teeth that have mesial-occlusal-distal (MOD) amalgam restorations, and it is often good practice to place some form of cusp coverage restoration to prevent destructive flexure during mastication.
