Effect of chlorhexidine on the bond strength of a self-etch adhesive system to sound and demineralized dentin

Abstract

This study evaluated the effect of a 2% chlorhexidine-based disinfectant (CHX) on the short-term resin-dentin bond strength of a self-etch adhesive system to human dentin with different mineral contents. Dentinal mineralization was tested at 4 levels (sound, and after 2, 4, or 8 days of demineralization-remineralization cycles) and disinfectant at 2 levels [deionized water (DW, negative control) and CHX]. Dentin demineralization induced by pH-cycling was characterized by crosssectional hardness (CSH). Each dentin surface was divided into halves, one treated with DW and the other with CHX (5 minutes). Each surface was bonded with a self-etch adhesive system and restored. The specimens were sectioned and subjected to microtensile bond testing. CSH and microtensile bond strength (µTBS) data were analyzed by regression analysis and ANOVA-Tukey tests (α = 5%), respectively. The groups treated with CHX resulted in mean µTBS similar to those found for the groups in which the dentin was exposed to DW (p = 0.821). However, mean µTBS were strongly influenced by dentin mineralization (p < 0.05): the bond strength found for sound dentin was lower than that found for dentin cycled for 8 days, which was even lower than the bond strengths for dentin cycled for 2 or 4 days. The results suggest that the degree of dentin demineralization affects the bond strength of self-etching adhesives, but the use of CHX does not modify this effect.

Effect of digluconate chlorhexidine on bond strength between dental adhesive systems and dentin: A systematic review

“…[ 35 ] On the contrary, other studies reported that application of a self-etch adhesive on CHX-treated sound dentin or artificially caries-affected dentin did not change the bond strengths. [ 28 45 46 ] Generally, the presence of carious dentin decreases bond strengths[ 47 ] and the higher the level of caries progression, the lower the bond strengths of adhesives to carious dentin. [ 48 ] Moreover, Francisconi et al .,[ 49 ] who focused on the effect of 2% CHX on the bond strength of adhesive systems to sound and artificially eroded dentin, found that although there was a significantly lower μTBS in artificially eroded dentin compared to sound dentin, the influence of CHX on bond strength conservation was not found to be persistent.…”

The Influence of Dentin Demineralization on Morphological Features of Cavities Using Er:YAG Laser

“…15 The dentin slabs were fixed onto the lids of glass container vessels with plastic wire and kept immersed in sterile distilled water. Artificial caries was induced by immersing nine slabs (groups G2-G4) in demineralizing and remineralizing solutions.…”

Chemical, microbial, and host‐related factors: effects on the integrity of dentin and the dentin–biomaterial interface

“…However, results are more conflicting with self‐etching systems. Using various experimental settings, CHX has been indicated to have positive , negative , or no effect on the behavior of self‐etch bonding.…”