Which irrigating provides a better bond strength in glass fiber posts: Chlorhexidine or Sodium Hypochlorite? A systematic review with meta-analysis.

BACKGROUND: The aim of this systematic review and meta-analysis was to evaluate the influence of the use of chlorhexidine on endodontic instrumentation on the bond strength of glass fiber posts with resin cements. The guiding question of the study was: "Is the bond strength of glass fiber posts greater when using chlorhexidine as an irrigator in endodontic treatment instead of sodium hypochlorite?".

MATERIAL AND METHODS: This study was conducted according to Guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA). In vitro studies were included that have compared chlorhexidine and sodium hypochlorite as an endodontic irrigator in the chemical-mechanical preparation.

RESULTS: Eight studies were included in the qualitative analysis and seven in the meta-analysis. Both the analysis by subgroups and the total analysis, using a random effect model, showed no statistically significant differences between the groups ( p > 0.05), either in the specific analysis for cervical root third ( p = 0.30; 95% CI = -2.11, 6.91) or medium ( p = 0.05; 95% CI = -0.03, 4.56), or nonspecific regarding the third to the root third ( p = 0.48; 95% CI = -4.00, 1.86).

CONCLUSIONS: There are no statistically significant differences in the bond strength of glass fiber posts and resin cements in teeth endodontically treated under irrigation by both chlorhexidine and sodium hypochlorite. Key words: Chlorhexidine, sodium hypochlorite, bond strength, glass fiber post.