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Influence of chlorhexidine application at longitudinal push-out bond strength of fiber posts
Vicente Castelo Branco Leitune1, Fabrício Mezzomo Collares, Susana Maria Werner Samuel
1Dental Materials Laboratory, School of Dentistry, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil. vicenteleitune@gmail.com
Objective:
The objective of this study was to evaluate the influence of chlorhexidine application after dentin phosphoric acid etching at immediate and long-term bond strength of a fiber post cemented to root dentin.
Study Design:
Seventy-two single-rooted, human upper teeth were selected. After phosphoric acid etching, each group received a different dentin treatment: no pretreatment or chlorhexidine 0.2% or 2.0%. Three-step etch-and-rinse adhesive and dual-cured resin cement was used to cementation procedure. Half of the teeth were submitted to push-out bond strength test after 24 hours and the other half after 6 months. Data were analyzed by 2-way ANOVA and Tukey.
Results:
Chlorhexidine application had no influence on bond strength when teeth were stored at the same aging time (P > .05). The storage time significantly decreased the bond strength values of 24 hours to 6 months in all groups (P < .05).
Conclusion:
After 6 months, chlorhexidine application did not effectively arrest bond strength degradation of fiber posts cemented in human roots.
