Effect of triple antibiotic paste on the bond strength of epoxy and methacrylate resin-based sealers to root canal dentin

Abstract

Purpose: This study aimed to evaluate the effect of triple antibiotic paste (TAP) as an endodontic intracanal medicament on the bond strength of epoxy and methacrylate resin-based sealers to root canal dentin. Materials and Methods: In this in vitro study, 80 single-rooted human mandibular premolars were prepared using ProTaper rotary system. The specimens were randomly divided into a control group (without intracanal dressing) and an experimental group receiving TAP ( n = 40). The intracanal dressing was removed after 3 weeks. Then, samples of each group were randomly divided into four subgroups ( n = 10) and obturated with gutta-percha and different resin-based sealers. G1: AH Plus, G2: Syntex, G3: EndoREZ, and G4: MetaSEAL. After 1 week, 16 slices of 1 ± 0.1 mm thickness were obtained from the midroots of teeth in each subgroup, and a push-out test was used to measure the bond strength. Slices were examined using a stereomicroscope at 30 × to determine the mode of failure. The data were analyzed using two-way analysis of variance, one-way analysis of variance, and Tukey post hoc tests (α = 0.05). Results: Compared to control group, TAP significantly increased the bond strength of MetaSEAL and EndoREZ ( P < 0.05). In the control group, epoxy resin-based sealers showed higher bond strength compared to methacrylate ones ( P = 0.00). In TAP group, Syntex and EndoREZ showed significantly the greatest and the lowest bond strengths, respectively, ( P < 0.05). The analysis of failure modes revealed a predominance of mixed failures in all groups except for Syntex group in which most failures were cohesive. Conclusions: TAP significantly increased the bond strength of methacrylate resin-based sealers.

Effect of Non-thermal Plasma Therapy on Pushout Bond Strength of Epoxy Resin and Tricalcium Silicate-Based Endodontic Sealers

“…31 This finding was in agreement with the results of previous studies that reported higher bond strength of epoxy resinbased sealers compared with tricalcium silicate-based sealers. 18,28,[32][33][34] In the present study, the PBS in the coronal and middle thirds was higher than that in the apical third in all groups. Dentinal tubules are cleaner, larger, denser, and vertically more organized in the coronal and middle thirds, leading to increased dentinal tubule penetration of endodontic sealants and their bonding to root canal walls in these areas.…”