Effect of ultrasonic and Nd: Yag laser activation on irrigants on the push-out bond strength of fiber post to the root canal

Abstract

Objective: This in vitro study aimed to compare the efficacy of irrigants using various irrigation activation methods to the push-out bond strengths of fiber post to root canal luted with self-adhesive resin cement (SARC). Methodology: Forty-eight decoronated human canines were used. The specimens were divided into four groups corresponding with the post-space irrigation process and were treated as follows: distilled water (DW) (Control) group received 15 mL of DW; sodium hypochlorite (NaOCl)+ethylenediaminetetraacetic acid (EDTA) group was treated with 5 mL of 5.25% NaOCl, 5 mL of 17% EDTA, and 5 mL of DW; passive ultrasonic irrigation (PUI) group was treated with 5 mL of 5.25% NaOCl, 5 mL of 17% EDTA, and 5 mL of DW, and each irrigant was agitated with an ultrasonic file; and laser activated irrigation (LAI) group was treated with 5 mL of 5.25% NaOCl, 5 mL of 17% EDTA, and 5 mL of DW, and each irrigant was irradiated with Nd: YAG laser. Fiber posts were luted with SARC, and a push-out test was performed. Data was analyzed using one-way analysis of variance and Tukey HSD test. Results: The bond strength values for the groups obtained were as follows: Control (10.04 MPa), NaOCl+EDTA (11.07 MPa), PUI (11.85 MPa), and LAI (11.63 MPa). No statistically significant differences were found among all experimental groups (p>0.05). The coronal (12.66 MPa) and middle (11.63 MPa) root regions indicated a significantly higher bond strength compared with the apical (9.16 MPa) region (p<0.05). Conclusions: Irrigant activation methods did not increase the bond strength of fiber post to canal.

Effect of post-space irrigation with acid solutions on bond strength and dentin penetrability using a self-adhesive cementation system

“…Some studies have shown better cleaning of the root canal walls when ultrasonic and Nd: YAG activation was performed, mainly in association with chelating solutions ( 23 , 24 ). On the other hand, some authors did not observe an improvement in the removal of the smear layer and debris when active irrigation was performed ( 22 , 25 ). This study evaluated only the chemical effect promoted by the chelating solutions, and it did not include another variable such as PUI or Nd: YAG laser.…”

“…In the literature, there are reports of studies which aimed to evaluate the effect of active irrigation using ultrasound and neodymium: yttrium-aluminum-garnet (Nd: YAG) laser to remove the smear layer and debris after post-space preparation ( 7 , 22 ). Some studies have shown better cleaning of the root canal walls when ultrasonic and Nd: YAG activation was performed, mainly in association with chelating solutions ( 23 , 24 ).…”

Comparison of the effect of QMix and conventional root canal irrigants on push‐out bond strength of fiber post to root dentin

“…Such differences are attributed to the variable densities of dentin, technical sensitivity, difficult application of adhesive into the narrow post space, and limitations in light curing of the root canal system. Some studies have reported a reduction in bond strength from the coronal towards the apical region (Fundao glu Küçükekenci & Küçükekenci, 2019;Jowkar et al, 2020). However, in this study, the bond strength in all groups was slightly, but not significantly, higher in the middle third compared with the coronal third of the roots.…”

“…To calculate the push‐out bond strength in megapascals (MPa), the debonding force in Newtons (N) was divided by the cross‐sectional area using the formula P=F/A where A is the post‐dentin surface area, which was calculated using the formula below: In this formula, R indicates the coronal root canal radius, r indicates the apical root canal radius, and h indicates the thickness of each section. (Fundaoğlu Küçükekenci & Küçükekenci, 2019).…”

Use of Rose Bengal, Methylene blue and Curcumin Photosensitizers activated using light emitting diode on post space disinfection bonded to fiber post: An assessment of extrusion bond strength

“…3 Among the various chemical irrigants used in dentistry, sodium hypochlorite (NaOCl) had gained widespread popularity due to its antimicrobial effectiveness, tissue dissolving properties, and lubrication. 4 It also possesses low viscosity which allows easy introduction and penetration into the canal space along with adequate shelf life and cost-effectiveness. 5 However, existing literature advocates that NaOCl is unable to remove the inorganic component of the smear layer which barricades adhesion of bonded restorations.…”