الفهرس 
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Abstract
Aim of the study: this study was carried out to:1. Compare microleakage and marginal adaptation of Mineral Trioxide Aggregate (MTA), Biodentine and Glass Ionomer Cement (GIC) as root-end filling materials using dye extraction technique and Scanning Electron Microscope (SEM) respectively. 2. Perform root-end resection, ultrasonic root-end preparation and filling under the magnification of Dental Operating Microscope (DOM). Materials and Methods: Ninety freshly extracted mandibular premolar human teeth were used in the study. After root canals instrumentation and obturation, the apical 3mm of each specimen were resected and root-end cavities were prepared using diamond coated ultrasonic retrotips. Specimens were subdivided into three experimental groups (n=30) according to the root-end filling material used. The procedures of root-end resection, ultrasonic root-end preparation and filling were performed under magnification of DOM. Each group was subdivided into two subgroups A&B (n=15 for each subgroup). Specimens in subgroup A were evaluated for microleakage using dye extraction technique. Specimens in subgroup B were evaluated for marginal adaptation using SEM. The obtained results were statistically analyzed using ANOVA and post hoc Tukey test. Person correlation coefficient was calculated for the obtained data to seek correlation between sealing ability and marginal adaptation of the tested materials. Results: White ProRoot MTA demonstrated less mean dye absorbance value and interfacial gap width compared to Biodentine and EQUIA Fil GIC with no statistical significant difference between them. Statistically significant positive correlation was found between dye absorbance values and gap width at the material/dentine interface. Conclusions: MTA, Biodentine and GIC have comparable sealing ability as root-end filling materials. Positive correlation exists between sealing ability and marginal adaptation of the tested materials.