ABSTRACT Aim: The aim of this study was to optimize a root-end filling material comprising phosphorylated pullulan (PPL) incorporated mineral trioxide aggregate (MTA) and to evaluate its marginal adaptation and pushout bond strength in vitro . Methods: Forty extracted human maxillary central incisors were decoronated and standardized to 16 mm. Root canals were prepared using WaveOne Gold #45.06 files, irrigated with saline, and obturated with gutta-percha by lateral condensation. After 1 week at 37°C and 100% humidity, 3 mm root-end resections and cavities were prepared ultrasonically. Samples were divided into two groups: Group I (MTA) and Group II (PPL with MTA P-MTA). Pushout bond strength was measured using an INSTRON Universal Testing Machine, and marginal adaptation was analyzed using scanning electron microscopy (SEM). Results: Pushout bond strength analysis demonstrated that P-MTA exhibited significantly greater bond strength (2.14 ± 0.73 MPa) than conventional MTA (0.68 ± 0.57 MPa) ( P < 0.05). SEM analysis revealed a significantly higher mean marginal distance in the MTA group (13.29 ± 9.59 µm) compared to the P-MTA group (10.09 ± 8.87 µm), indicating superior marginal adaptation of P-MTA ( P < 0.05). Conclusion: P-MTA demonstrated superior marginal adaptation and pushout bond strength compared to conventional MTA. Further in vitro and clinical studies are required to validate these findings.
Pragathi et al. (Tue,) studied this question.