The glass-ionomer-lined cervical composite restoration: an in vitro investigation

The marginal adaptation and microleakage of the glass-ionomer-lined composite resin restoration in simulated erosion and conventional class 5 preparations were evaluated. The most common site of leakage for all restorations was the gingival margin. In erosion lesion restorations, the etched thick liners were superior to the etched thin liners with respect to marginal leakage. Acid-etched and unetched liners in both the erosion lesion and the conventional class 5 restorations were comparable. Under the SEM a gap was often found in the liner rather than at the liner-resin interface in restorations with etched liners.