THE JOURNAL OF - Dentsply

Rosales-Leal
fect the occlusal sealing and showed that the enamel junction
is resistant to aging, due to the mineral nature of the tissue
which ensures a better and more durable bond. 4 In contrast,
the dentin bond was susceptible to damage and the
sealing was reduced after thermocycling. 18 The larger proportion
of organic compounds and water in the dentin
makes the union weaker for all the adhesives tested, which
would explain aging. 11,17 Thermocycling accelerates the aging
by hydrolytic degradation of the hydrophilic components
in the bonding system. 12,22 In addition, repetitive contraction/expansion
stress at the bonding interface may lead to
cracks that propagate along the interface and cause in- and
outflow of fluids. 5 When considering distribution of microleakage
grades in all obtained slices, only XPB was not
affected by thermocycling.
Clinically, when a cavity is surrounded by enamel, the
phosphoric acid will ensure a hermetic and durable bond.
When the cavity margins are in dentin, improvements are
necessary, but there are some self-etching adhesives (XNO,
CLF) or etch-and-rinse adhesives (XPB) that obtain excellent
results with no positive dentin permeability and low leakage.
Perhaps more acidic primers could improve the sealing of
composite resin restorations.
CONLUSIONS
In enamel, no microleakage was found when phosphoric
acid was used, but self-etching adhesives showed slight
leakage. The gingival sealing was inferior to the occlusal
sealing. XNO and CLF obtained the best gingival sealing, followed
by XPB, SBX, P&B, and IBO, with SYN demonstrating
the worst sealing. Self-etching adhesives and XPB were able
to hermetically seal the dentin tubules (negative permeability).
Thermocycling did not affect the occlusal bonding or XPB
gingival sealing.
ACKNOWLEDGMENTS
This research was sponsored by Dentsply DeTrey, Konstanz, Germany.
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Clinical relevance: Phosphoric acid ensures hermetic
and durable union on enamel. Although there are some
excellent adhesives, it is nesessary to improve the
dentin sealing.
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