Microleakage in dental composites: Microhybrid versus Nanocomposites

Class V cavities can develop due to caries, erosion, abrasion or abfraction at the cervical margin of buccal and/or lingual surfaces of teeth. Due to increase in the esthetic demands, bonded composites are the common choice for esthetic restoration of class V lesions. The main disadvantage of all light cure composite resins is the polymerization shrinkage resulting in the microleakage at tooth restoration interface. This causes marginal discrepancies and consequently sensitivity, secondary caries, pulpal involvement, loss of retention leading to dislodged restoration or loss of aesthetics due to marginal discoloration. Since, some microleakage is inevitable, the restorative aim for such lesions is to create the best possible seal at the tooth-restoration interface.