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Introduction: For the success of endodontic treatment, studies have emphasised the importance of adequate coronal seal. Failure of treatment results from poor coronal seal in various clinical situations. Roghanizad and Jones suggested an intraorifice barrier that can protect the root canal system from contamination, by saliva, in the event of loss of coronal restoration.

Objective: To evaluate and compare three flowable composite (Denfil flow, FiltekTM Z350 XT, and Dyad flow) and coloured glass ionomer cement (Fuji VII) as intraorifice barrier material, for the prevention of coronal microleakage in absence of coronal restoration.

Materials and Method: In this in vitro study, decoronation of 90 extracted human incisors without fractures or defects, severe attrition, caries, apical resorption, and previously root canal treated, was done. They were then divided into four experimental (n = 20) and two control groups (n = 5) using “Simple randomisation allocation”. The four experimental materials were applied as a 4-mm intraorifice barrier, and a 2% methylene blue dye leakage test was carried out along with thermocycling for 100 cycles. Dye leakage was evaluated with a stereomicroscope under 10X magnification, photographed, and measured using Adobe Photoshop CS version 8.0.

Result: Significant microleakage were observed in Dyad flow and Fuji VII compared to FiltekTM Z350 XT and Denfil flow which didn’t show a significant difference between them. Fuji VII, on the other hand, also showed significant microleakage from Dyad flow.

Conclusion: Flowable composites that include a separate ‘etch and rinse’ step, could seal the orifice better against coronal leakage.

Coronal microleakage; Glass ionomer cement; Flowable Composite; Intraorifice barrier.