Impact of Aging on the Push-out Bond Strength of Two Endodontic Sealers: A Comparative In Vitro Study
Year: 2025
Type: article
Abstract: Aim: This study aimed to evaluate the impact of time/aging on the adhesion of one calcium silicate-based sealers (CSBS) (AH Plus® BC Sealer) compared to another novel sealer (K-Biocer) by comparing their push-out bond strength (POBS).Materials and methods: Ninety single-rooted human mandibular premolars were instrumented using the R25® instrument (Reciproc, VDW, Munich, Germany) and randomly divided into two main groups, A and B (n = 45) based on the sealers used: AH Plus® BC sealer or K-Biocer.All teeth were obturated with matched-taper single-cone and stored for 7 days at 37°C and 100% humidity.Each group was then subdivided into three subgroups (A1, A2, A3) and (B1, B2, B3) (n = 15).Groups A1 and B1 were controls, while A2/B2 and A3/B3 underwent 5,000 and 10,000 thermocycles, respectively.Root slices (1 mm thick) from the coronal, middle, and apical thirds were subjected to a push-out test using a universal testing machine.Failure mode was evaluated under magnification.Statistical analysis included Chi-squared, Fisher's exact test, Kruskal-Wallis, and three-way ANOVA.Results: No significant associations were found between failure mode and sealer type or aging.Dislodgement resistance varied significantly across canal levels (p < 0.001), with the highest resistance in the coronal third (mean = 10.5 MPa).The most frequent failure mode was cohesive.Conclusion: Thermal aging did not significantly affect the dislodgement resistance of either sealer.Both materials maintained stable adhesion over time, suggesting resistance to degradation. Clinical significance:The clinical interest of this study is to assess the adhesion of CSBS to dentinal walls and to better understand the mechanical properties of these sealers.AH Plus® BC Sealer and K-Biocer demonstrated comparable and durable adhesion, unaffected by aging.
Authors: Yalda Assaf, Roula El Hachem, Marc-Krikor Kaloustian, Carla Zogheib, Issam Khalil, Georges Najjar, Ryan Harouny, Germain Sfeir
Institution: Saint Joseph University
Language: English
Subfield: Oral Surgery
Field: Dentistry
Domain: Health Sciences
Open Access status: diamond
OpenAlex ID: W4414376329