Biomechanical behavior of endodontically treated premolars using different preparation designs and CAD/CAM materials

Abstract Objectives To evaluate the effect of restoration design (‘2.5-mm deep endocrown’, ‘5-mm deep endocrown’ or ‘5-mm deep postc teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2.5-mm or 5-mm deep intra-radicular extension) or conventional crowns (5-mm deep postc this may be explained by their difference in elastic modulus. Clinical significance Shallow endocrown preparations on premolars present less surface for adhesive luting and a difference in crown material becomes apparent in terms of load-to-failure. The use of a more flexible composite crown material appeared then a better option.