Fracture resistance under cyclic loading of lithium disilicate vonlays versus rosetta vonlays restoring premolars : in vitro study

Abstract EN

The mean values ± SDs values for e.max group were (502.39 ±102.89 N) with minimum value (338.16 N) and maximum value (721.29 N).

The mean values ± SDs values.

Rosetta group were (468.76 ± 67.54 N) with minimum value (367.11 N) and maximum value (648.48 N).

Failure modes were determined under stereomicroscope and classified into repairable and catastrophic in both groups and showed that 60% of e.max group exhibited repairable failure while 40% of specimens showed catastrophic failure while in Rosetta group, 90% of the specimens exhibited repairable failure.

Only 10% displayed catastrophic failure.

Then a fractured part within each group was examined under scanning electron microscope (SEM) to reveal and compare their microstructure.