The effect of the interface lute on the structural integrity of the tooth adhesively restored with an all-ceramic crown remains is an unknown parameter especially in relation to the interface geometry (thickness and uniformity). Traditionally, the structural integrity of a restored tooth system (tooth-lute-crown) is tested by laboratory based mechanical testing. However, a more sophisticated FEA computer modelling seems to provide a non-destructive way of understanding the structural integrity of the system, which may complement mechanical testing.