Effect of Resin Coating and Chlorhexidine on Microleakage of Two Resin Cements after Storage

Abstract

Objective: Evaluating the effect of resin coating and chlorhexidine on microleakage of
two resin cements after water storage.
Materials and Methods: Standardized class V cavities were prepared on facial and lingual
surfaces of one hundred twenty intact human molars with gingival margins placed 1
mm below the cemento-enamel junction. Indirect composite inlays were fabricated and the
specimens were randomly assigned into 6 groups. In Groups 1 to 4, inlays were cemented
with Panavia F2.0 cement. G1: according to the manufacturer's instruction. G2: with light
cured resin on the ED primer. G3: chlorhexidine application before priming. G4: with
chlorhexidine application before priming and light cured resin on primer. G5: inlays were
cemented with Nexus 2 resin cement. G6: chlorhexidine application after etching. Each
group was divided into two subgroups based on the 24-hour and 6-month water storage
time. After preparation for microleakage test, the teeth were sectioned and evaluated at
both margins under a 20× stereomicroscope. Dye penetration was scored using 0-3 criteria.
The data was analyzed using Kruskal-Wallis and complementary Dunn tests.
Results: There was significantly less leakage in G2 and G4 than the Panavia F2.0 control
group at gingival margins after 6 months (P<0.05). There was no significant differences in
leakage between G1 and G3 at both margins after 24 hours and 6 months storage. After 6
months, G6 revealed significantly less leakage than G5 at gingival margins (P=0.033). In
general, gingival margins showed more leakage than occlusal margins.
Conclusion: Additionally, resin coating in self-etch (Panavia F2.0) and chlorhexidine application
in etch-rinse (Nexus) resin cement reduced microleakage at gingival margins after
storage.