Quantitative comparison of permeability in the adhesive interface of four adhesive systems

Since the acid-etch technique for bonding to the tooth substrate had been introduced, adhesive dentistry evolved rapidly due to two main reasons; esthetic satisfaction and minimal invasiveness. Some retrospective clinical studies have showed the favorable durability of resin restoration over 10 years. However, the majority of bonded restorations are disadvantaged by their early failure during service and they only remain in an optimum condition for a limited period of time. Generally, the immediate bonding effectiveness of current dentin adhesives seems to be favorable, but their potential degradation process is still a concern. Recent studies have identified the major factors affecting durability as the hydrolysis of interface components such as collagen and resin, and subsequent elution of the breakdown products. Currently, increased permeability of hydrophilic adhesive systems showed water uptake within the adhesive resin matrix, leading to incomplete polymerization. In the bonding process, unbound monomers or additives in the nanoleakage spaces are extracted by solvents. Following this, leachable components can be created in the aqueous environment over time. Thermocycling is a widely used artificial aging QUANTITATIVE COMPARISON OF PERMEABILITY IN THE ADHESIVE INTERFACE OF FOUR ADHESIVE SYSTEMS