In Vitro Effect of Using Endo-Activator on Pushout Bond Strength of Radicular Dentin to Prefabricated Fiber Post in Using Natural Matrix Metalloproteinase Inhibitors.

OBJECTIVES: This study assessed the effect of using Endo-Activator on pushout bond strength (PBS) of radicular dentin to prefabricated fiber post in using epigallocatechin gallate (EGCG) and aloe vera natural matrix metalloproteinase (MMP) inhibitors. MATERIALS AND METHODS: This in vitro study was conducted on 120 extracted teeth in 2 groups with/without using Endo-Activator for root canal irrigation, each with 3 subgroups of LuxaBond primer (I) alone, (II) with aloe vera, and (III) with EGCG. After root canal treatment and post space preparation, radicular dentin was etched, the respective primer was rubbed on radicular dentin, and fiber posts were cemented using LuxaBond dual-cure adhesive and LuxaCore Z dual-cure cement. Each tooth was horizontally sectioned at the coronal, middle, and apical thirds, and the PBS of fiber post to dentin was measured immediately and after 6 months. Failure mode was determined under a stereomicroscope (×80). RESULTS: Irrigation with Endo-Activator improved both the immediate and 6-month PBS in all sections (p < 0.05). The highest immediate PBS was recorded in the coronal third in the aloe vera subgroups with no significant difference between use/no use of Endo-Activator (p > 0.05). At 6 months, aloe vera yielded the highest PBS in the coronal third, with significantly higher values in use of Endo-Activator (p < 0.05). CONCLUSION: Irrigation with Endo-Activator along with the application of EGCG and aloe vera significantly improved the PBS of fiber post to radicular dentin and its durability; this effect was greater in the cervical third in the aloe vera subgroups both immediately and after 6 months.