Abstract
This study evaluated the load required to fracture the marginal ridge of tunnel-filled teeth restored with various adhesive filling materials. Five test groups, each consisting of 20 extracted maxillary premolars, were filled with either composite resin or a conventional, a cermet, or two brands of resin-modified glass ionomer (polyalkenoat) cements. The tunnels were prepared with the occlusal access placed in the mesial fossa, leaving a relatively thin approximal wall. The teeth were subjected to incremental dynamic forces. A maximum absorbed energy index, quantifying the fracture resistance of the teeth, showed no statistically significant differences between the test groups with regard to marginal ridge strength, even though the elastic moduli of the materials varied. None of the adhesive materials restored the teeth to the strength of sound teeth.
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