Effect of two dentin bonding agents on microleakage in two different cavity designs.

Studies have shown that cavity design and dentinal bonding agents can affect composite resin microleakage. This study compared the microleakage at cementum-dentin margins of box- and Vshaped preparations restored with two different bonding agents. Twenty freshly extracted, human third molars were prepared with one box-shaped and one V-shaped preparation on the mesial or distal surface. Occlusal margins were terminated in etched enamel and gingival margins were in cementum-dentin. There was no statistically significant difference (p greater than 0.05) between Dual Cure Scotchbond and Scotchbond 2 samples restored in the box-shaped preparations, but Scotchbond 2 had statistically significantly less microleakage (p less than 0.05) than Dual Cure adhesive in V-shaped preparations. The sealing of dentinal bonding agents varied in different cavity designs.