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

Abstract

Background The aim of this study was to evaluate the effects of surface treatments with 1% peracetic acid (PA), solution containing 17% EDTA (SmearClear, Kerr Endodontics), solution containing a combination of 17% EDTA with 2% chlorhexidine (QMix, Dentsply Sirona) on the post-space root dentin compared to 2.5% sodium hypochlorite (NaOCl) on bond strength and resin tags length in dentin. Material and Methods Forty human-canine roots were endodontically treated and the post space was prepared. The specimens were randomised into four groups (n = 10): control – irrigation with 2.5% NaOCl solution, PA – irrigation with 1% PA, SmearClear – irrigation with SmearClear solution, and QMix – irrigation with QMix solution. The fibre posts were cemented using a self-adhesive resin system (Relyx U200, 3M ESPE). After six months, the specimens were cross-sectioned and subjected to push-out and confocal laser microscopy tests. One-way ANOVA and Tukey’s tests were used to analyse the data (α= 0.05). Results PA and QMix presented the highest bond strength values compared to the other groups ( p < 0.05). There was no significant difference between the resin tags length in dentin by the groups ( p = 0.75). Conclusions Irrigation of the post space with 1% PA and QMix showed a positive clinical impact on the adhesion between the fiber post and root dentin. However, these materials had no influence on resin tags length in dentin by self-adhesive resin cement. Key words: Fiber post, adhesive cementation, self-adhesive resin cement, root dentin, irrigating solutions.

Effect of irrigation acid solutions on cleaning and bond strength to post‐space dentin

“…Different irrigation solutions are proposed to clean the postspace [29,30]. However, there is no standardized protocol for post-space cleaning prior to glass fiber post cementation.…”

Effect of aging and cementation systems on the bond strength to root dentin after fiber post cementation

“…The dye rhodamine B (LabSynth) at 0.1% (% mass) was incorporated into the cementation systems of all specimens 15 , 16 , 17 to evaluate the tag formation in the post-space dentin. All clinical procedures were performed by only one properly trained operator.…”

Etch‐and‐rinse versus self‐etch strategy of a universal adhesive in different application methods at the bonding interface of fiber post cementation

“…The force values ( F ) required for displacement of the set were obtained in Newton (N) and later converted to bond strength values in megapascals (MPa) using the formula: MPa = F /AD, where AD corresponds to the adhesion area. The adhesion area was calculated using the following formula 7 : where R is the cervical radius of the root canal in mm, r is the apical radius of the root canal in mm, and g is the geratrix of the inverted cone in mm. The cervical and apical diameters of the root canals were individually measured using a stereomicroscope with 20× magnification (Leica Microsystems, Wetzlar, Germany).…”

“…The cervical and apical diameters of the root canals were individually measured using a stereomicroscope with 20× magnification (Leica Microsystems, Wetzlar, Germany). The g value was obtained from the equation 7 : …”

“…The successful retention of fiber post cementation in the root canal is directly related to the appropriate selection of the cementation system and the use of clinical strategies that optimize adhesion with the dentin substrate 1–4 . Conventional resin cements, along with etching or self‐etching (SE) adhesives, and self‐adhesive resin cements, are the most commonly used universal adhesives 5–7 . Although adhesion to dental structures has made undeniable progress in recent years, 8–10 failures related to the retention of fiber posts have presented new scenarios and problems, such as the mode of adhesive application in the post space, which has become a major focus of investigation.…”