Microleakage of three resin placement techniques.

The microleakage associated with three composite resin placement techniques was compared using Class V preparations that extended just beyond the cemento-enamel junction of extracted human molars. The placement techniques were evaluated in conjunction with four adhesive bonding agents. The restored teeth were stored in tap water for 24 hours and then thermally stressed for 100 temperature cycles. Marginal leakage was assessed by measuring the linear penetration of a dye solution. Dye penetration was minimized by using an incremental placement procedure in which the first increment was placed in the coronal portion of the cavity, extended down to the gingivo-axial line angle, and cured. The second increment was used to fill the remainder of the preparation.