Marginal leakage of impregnated Class 2 composites in primary molars: an in vivo study

In vivo impregnation of the cervical margin was used in an attempt to prevent leakage of class 2 composite restorations in primary molars. Examination after 18 months demonstrated clinical success of the restorations. However, the exfoliated teeth presented extensive dye penetration at the approximal margins of the restorations, suggesting that impregnation did not prevent marginal leakage.