Influence of chlorhexidine digluconate on bond strength durability of a self-etching adhesive system

Resumo

Introduction and objective: The aim of this study was to evaluate
in vitro the effect of 2% chlorhexidine on bond strength durability
of a self-etching adhesive system (ClearFill SE Bond). Material and
methods: Forty bovine incisors’ crowns had their labial surfaces
abraded to dentin exposure, dentin exposure, in order that the standard adhesion in order that the standard adhesion in order that the standard adhesion
area reached 4 mm in diameter. Subsequently, they were divided into
four groups, according to the treatments performed on the surfaces
and storage time: G1 – adhesive system without chlorhexidine for 24
hours (control group); G2 – adhesive system without chlorhexidine for
6 months (control group); G3 – adhesive system with chlorhexidine
for 24 hours (experimental group); G4 – adhesive system with
chlorhexidine for 6 months (experimental group). After dentin surface
treatments, cylinders of composite resin (Z350) were constructed.
Then, the specimens were stored in distilled water according to
each group design and storage time. Following, the four groups were
subjected to shear bond strength test, at a crosshead speed of 0.5
mm / min. The obtained values were subjected to statistical analysis.
Results: The results indicated a significant decrease of bond strength
in the group treated with chlorhexidine followed by 24-hour storage
when compared to control group. However, there was no significant
difference in 6-month storage between the experimental and control
groups (p>0.05). Conclusion: The application of 2% chlorhexidine
was deleterious for bond strength after 24-hour storage.