Effect of Medications for Root Canal Treatment on Bonding to Root Canal Dentin

Abstract

Use of resin-based restorative materials recently has become widely accepted for treatment of endodontically treated teeth. However, some solutions routinely used during endodontic treatment procedures may have an effect on bond strengths of adhesive materials to root canal dentin. The purpose of this in vitro study was to evaluate the effect of various medications on microtensile bond strength to root canal dentin. Fourteen extracted human single-rooted teeth were used. The crowns and the pulp tissues were removed. The root canals were then instrumented and widened to the same size. The teeth were randomly divided into seven groups of two teeth each. The root canal dentin walls of the roots were treated with 5% sodium hypochloride (NaOCI), 3% hydrogen peroxide (H2O2), the combination of H2O2 and NaOCl, or 0.2% chlorhexidine gluconate for 60 s; or calcium hydroxide or formocresol for 24 h. The teeth in control group were irrigated with water. The root canals were obturated using C&B Metabond. After 24 h of storage in distilled water, serial 1-mm-thick cross-sections were cut, and approximately 12 samples were obtained from each group. Microtensile bond strengths to root canal dentin were then measured by using an Instron machine. The data were recorded and expressed as MPa. The results indicated that NaOCI, H2O2, or a combination of NaOCl and H2O2 treatment decreased bond strength to root canal dentin significantly (p < 0.05). The teeth treated with chlorhexidine solution showed the highest bond strength values (p < 0.05). In conclusion, chlorhexidine is an appropriate irrigant solution for root canal treatment before adhesive post core applications.

Effect of 2% chlorhexidine gluconate cavity disinfectant on microtensile bond strength of tooth-coloured restorative materials to sound and caries-affected dentin

“…When shear bond test was used, other studies also showed that the application of CHX did not have a negative effect on the bond strength of adhesive systems [1,18]. On the other hand, one study even reported increased shear bond strength when CHX was used [19]. De Castro et al [18], reported that 2% CHX solution, applied before or after acid etching of the dentin, did not interfere with the µTBS of composite resin to the dentin treated with Prime&Bond NT, Single Bond or Clearfil SE Bond bonding systems.…”

Influence of Endodontic Irrigants on Resin Sealer Bond Strength to Radicular Dentin

“…Initial free radical generation of dimethacrylate monomers is directly related to the irradiance absorbed by the composite. The rate of polymerization of the resin composites is proportional to the square root of the absorbed light intensity and photoinitiator concentration 4,18) . Besides the low light intensity as depth increases, shrinkage stress due to polymerization could lead to weakened bond strength of the cement.…”

Investigation of Coronal Leakage of Root Fillings After Smear-Layer Removal with EDTA or Nd:YAG Lasing Through Capillary-Flow Porometry

“…50 Furthermore, it might have negative effects on the bond strength of adhesive cement to root-canal dentin. 51,52 Based on the present findings, an additional advantage of the Nd:YAG laser technique is therefore its cleaning efficacy and low tendency to produce mineral loss from the root-canal dentin. 53 …”