Bond Strength of an Epoxy Resin Root Canal Sealer Prototype

<b>Background/Objectives</b>: We aimed to assess the bond strength of AH Plus Jet (AH) and an epoxy resin-based root canal sealer prototype (K-0189) adhered to three different obturation points. <b>Methods</b>: A total of 120 single-rooted teeth were selected after radiographic analysis, and their root canals were instrumented with ProTaper Next files (PTN) up to size X5. The teeth were randomly assigned to two sealer groups (G) (G1: AH, G2: K-0189, each n = 60) and further divided into three subgroups: (A) ConformFit X5 points (PTN) cold obturation (CO), (B) ProTaper Universal F5 points (PTU) (CO), (C) GuttaCore X5 (GC) warm obturation (WO). After final irrigation (NaOCl 3%, EDTA 17%, NaOCl 3%) and drying, root canals were obturated and stored for 30 days at 37 °C in Simulated Body Fluid (SBF). The specimens were embedded in acrylate and sectioned horizontally; then, push-out bond strength (POBS) analysis was performed. <b>Results</b>: The median POBS values [MPa] were G1A: 2.03; G1B: 2.12; G1C: 3.2; G2A: 1.91; G2B: 2.56; and G2C: 3.36. WO showed significantly higher POBS (<i>p</i> < 0.001 *) than CO. The POBS was not significantly different between the two WO groups (<i>p</i> = 0.508). The POBS of G2B was significantly higher compared to all other CO groups. <b>Conclusions</b>: The epoxy resin sealer prototype demonstrated POBS values comparable to AH Plus when used with WO and PTU points, indicating significantly higher POBS values compared to all other CO points.