Fracture resistance of reinforced glass ionomer as a buildup material.

This study in vitro investigated the fracture resistance of two reinforced glass ionomers and amalgam when used as core-buildup materials. Four-pin buildups using the three materials were placed in human molar teeth and prepared for gold crowns. The crowns were cemented and the teeth were compressed at 45 degrees to failure. There was no significant difference found in the fracture resistance of the three materials.