Effect of chlorhexidine and isopropyl alcohol on immediate and delayed bond strength of glass fiber posts

  • Ellizandra Anater Lecardelli Graduate Program in Dentistry, Federal University of Pelotas (UFPel), Pelotas, RS, Brazil.
  • Victório Poletto-Neto Graduate Program in Dentistry, Federal University of Pelotas (UFPel), Pelotas, RS, Brazil.
  • Fernanda Geraldo Pappen Graduate Program in Dentistry, Federal University of Pelotas (UFPel), Pelotas, RS, Brazil.
  • Tatiana Pereira-Cenci Graduate Program in Dentistry, Federal University of Pelotas (UFPel), Pelotas, RS, Brazil.
  • Renata Dornelles Morgental | remorgental@hotmail.com Graduate Program in Dentistry, Federal University of Pelotas (UFPel), Pelotas, RS; Graduate Program in Dental Science, Federal University of Santa Maria, RS, Brazil.

Abstract

Aim: To investigate the effects of dentinal treatment with chlorhexidine and isopropyl alcohol, alone or associated, on the bond strength and bond stability of glass fiber posts cemented with a self-adhesive resin cement.

Materials and Methods: Forty bovine teeth were endodontically treated and randomly distributed into four groups, according to the dentinal treatment after post space preparation: distilled water (Control); 2% chlorhexidine (CHX); isopropyl alcohol (ISO); 2% chlorhexidine + isopropyl alcohol (CHX+ISO). Glass fiber posts were cemented with a self-adhesive resin cement and after 24 h specimens were cut into six 1.5 mm-thick slices. One slice of each root third (i.e. apical, middle and coronal) was subjected to immediate push-out test and the other was stored in distilled water at 37 °C for six months for delayed push-out test. Bond strength was registered in megapascal (MPa). Failure mode was evaluated by a stereomicroscope, with 40x magnification. Data analysis was performed using Kruskal-Wallis and Friedman tests, with 5% significance level. Results: No significant differences were detected between experimental groups or between root thirds in the same group in the immediate evaluation. After six months of aging, all groups showed a significant decrease in bond strength values, but ISO group presented higher bond strength than Control and CHX groups (p=0.0001). The most common type of failure for all groups was adhesive between resin cement and root dentine.

Conclusions: Dentinal treatment with CHX and ISO, isolated or combined, did not affect the immediate bond strength of glass fiber posts, but the ISO group presented better bond stability after six-month aging.

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Published
2019-10-31
Section
Original Articles
Keywords:
Chlorhexidine, Isopropyl Alcohol, Post and Core Technique, Root Canal Irrigants, Root Canal Preparation
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How to Cite
Anater Lecardelli, E., Poletto-Neto, V., Pappen, F. G., Pereira-Cenci, T., & Dornelles Morgental, R. (2019). Effect of chlorhexidine and isopropyl alcohol on immediate and delayed bond strength of glass fiber posts. Giornale Italiano Di Endodonzia, 33(2). https://doi.org/10.32067/gie.2019.33.02.06