Restoration of noncarious cervical lesions is a usual clinical procedure, and there is a high incidence of restoration loss, marginal discoloration, and recurrent caries. All the factors that play an important role in this process have to be considered when studying this kind of lesion of complex multifactorial etiology. Microleakage was evaluated related to the type of material used (two fourth generation bonding systems used with two types of composite resins: hybrid and microfill), two polymerization methods for bonding systems (photo and dual cure) and two restorative techniques (incremental and bulk). This study used thermal and mechanical cycling procedures, infiltration tests with silver nitrate solution, longitudinal multiple sections, and the results were measured by a scale of scores. Less microleakage was found with hybrid composite resin when compared to the microfill composite. Microleakage was lower with dual polymerization of the adhesive system than with photopolymerization only. Restorative techniques used did not influence the microleakage pattern of restorations of noncarious cervical lesions
Microleakage; Dentin-bonding agents; Composite resins; Noncarious cervical lesions