الفهرس 
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Abstract
This study was conducted to evaluate sealing ability and adaptation of Resin and Bioceramic sealers in curved canals.
A total of 80 human mandibular 1st molars which have curved roots ranged from 5˚ to 15˚ (Schneider degree) were used in this study. Decoronation was done, the root length was determined. Instrumentation was done using ProTaper rotary files.
Samples were divided into two experimental groups according to the type of sealer used for obturation of root canals (AH Plus & TotalFill). Each group was further divided into two subgroups according to the test of evaluation being carried out.
For evaluation of sealing ability; Dye penetration method (clearing technique) was used. Maximum dye penetration from the apex to the most coronal part of the root was then captured using digital stereomicroscope and measured by a ruler tool in Adobe Photoshop software. The mean value of leakage for each sealer was calculated. . Data collected and statistically analyzed.
For evaluation of adaptation; roots were transversely sectioned at cervical, middle and apical thirds, mounted in aluminium stubs, vacuum dried, coated with 20μm of gold and examined under scanning electron microscope. The value of gaps was calculated. Data collected and statistically analyzed.
Results showed that the dye penetration in roots which obturated using TotalFill bioceramic sealer was significantly higher than in roots which obturated using AH plus resin sealer. A statistically significant difference was found between AH Plus and Total Fill BC sealer.
Regarding the adaptation, more gaps were observed in samples which obturated using TotalFill BC sealer when compared with samples which obturated using AH Plus resin sealer. The results showed that the highest mean value was found in (Apical) third followed by (Middle) third, while the lowest mean value was found in (Coronal) third for both sealers, more gaps were observed at the apical level of both sealers types than at the middle and coronal levels.