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Abstract
Ketac Fil glass ionomer cement (GIC) and Scotchbond 2 dentinal bonding agent (DBA)/Silux
Plus composite resin restorations were inserted in cervical cavity preparations of
extracted human teeth. After thermocycling, the specimens were invested and sectioned
longitudinally and horizontally through the center of the restoration. Microleakage
was evaluated as a ratio of the extent of methylene blue dye penetration at the tooth-restoration
interface. Although all restorations exhibited leakage, both the GIC and bonded composite
resin restorations recorded less leakage in retentive than in nonretentive cavity
preparations. Composite resin restorations in nonretentive cavity preparations showed
significantly more dye penetration toward the pulpal chamber than the GIC restorations.
Ketac Fil GIC restorations inserted without a matrix strip exhibited less leakage
than those with a matrix strip. The most desirable results were recorded with Scotchbond
2 DBA/Silux Plus composite resin restorations in retentive preparations.
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© 1992 The C. V. Mosby Company. Published by Elsevier Inc.