Effect of chlorhexidine application on bond durability of a filled-adhesive system

ABSTRACT

The aim of this study was to evaluate the effect of chlorhexidine [CHX] application on immediate and two-month bond strength of a filled adhesive system. Forty eight non-carious human third molars without enamel of occlusal surface were randomly divided into two main groups according to CHX application control and CHX. Each main group was further subdivided into 2 subgroups depending on storage time immediate or two-month collagenase storage. In CHX groups, 2% CHX was applied for 30 s. Filled adhesive resin [PQ1] was applied on the etched dentin surfaces and cured in all experimental groups. Composite resin [Amelogen] was placed on the dentin surfaces and shear bond strength [SBS] was evaluated immediately and after two-month storage in collagenase solution. Failure modes were determined by stereomicroscope. There was no significant difference in immediate SBS between groups [P>0.05]. After two-month collagenase storage, although SBS was significantly reduced in control group [P<0.05], no significant reduction was observed in CHX group [P>0.05]. SBS in CHX group was significantly higher than the control group [P<0.05]. The use of CHX had no adverse effect on immediate bond strength of filled adhesive and could preserve the bond strength