Dental adhesive systems produce appropriate retention ( while conserving the sound tooth structure ) ; appropriate marginal sealing and favorable distribution of forces across the restoration - tooth interface. Bond strength measurement is one of the most reliable methods for evaluating the adhesives clinical performance. The strength and durability of adhesive bonds depend on multiple intersecting factors among which are : the quality of the hybrid layer in terms of : the qualitative distribution of adhesive monomers [ tubule - wall hybridization , lateral tubule hybridization, direction of...