Adjunctive application of chlorhexidine and ethanol-wet bonding on durability of bonds to sound and caries-affected dentine
Abstract
Objectives
To
examine the effect of adjunctive application of chlorhexidine (CHX) and
ethanol-wet bonding (EWB) on bond durability and nanoleakage of
hydrophobic adhesive to sound (SD) and caries-affected dentine (CAD).
Methods
Dentine surfaces of molars were etched after caries removal and randomly allocated to four groups (n = 12).
In Groups 1 and 2, dentine surfaces were saturated with either 2 ml of
100% ethanol or 2 ml of ethanol with 2% CHX for 60 s. In Groups 3 and 4,
dentine surfaces were saturated with either 15 μL of distilled water or
15 μL of distilled water with 2% CHX for 60 s. Two coats of primer,
followed by neat resin were applied and light-cured for 40 s. Resin
composite build-ups were placed and bonded specimens were sectioned for
bond strength testing after 24 h and 12 months’ storage in artificial
saliva. Bond strength data were analyzed using 3-way ANOVA and SNK
tests. Interfacial nanoleakage was evaluated after 24 h and 12 months
using a field-emission scanning electron microscopy and data were
analyzed using Kruskal–Wallis test.
Results
Significant differences were observed for the three factors: “substrate” (p < 0.001), “rewetting agents” (p < 0.001) and “time” (p < 0.001)
on bond strength. Incorporation of 2% CHX to EWB preserved bond
strength to SD and CAD and reduced interfacial nanoleakage after 12
months. Incorporation of 2% CHX to WWB also preserved bond strength to
SD after ageing.
Conclusions
Incorporation
of chlorhexidine to ethanol-wet bonding has an interaction effect on
preservation of bond durability to sound and caries-affected dentine.
Clinical significance
Incorporation
of chlorhexidine to ethanol-wet bonding with hydrophobic adhesive
enhances the success rate of aesthetic bonded restorations.
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