الفهرس 
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Abstract
This study compared the effect of different root canal irrigating regimens, 17% EDTA, 10% Citric acid, 16 ppm Ozonated water on the apical sealing ability, and adaptation of bioceramic-based sealer (TotalFill BC) and resin-based sealer (AH Plus).
One hundred and fifty-five single-rooted teeth were decoronated, shaped with Revo-s till AS40/.06 file, cleaned with 2.5% NaOCl between each file. Teeth were randomly divided into three groups according to final irrigation and further subdivided into two subgroups according to the type of sealer used. Each subgroup was then divided into two divisions based on the time of evaluation.
Specimens were covered with a double coat of nail varnish expect the apical 3 mm of the root apex. These roots were subjected to the fluid filtration test. Five samples from each division were evaluated with scanning electron microscopy (SEM) to examine the gap interface by using ImageJ software.
Data were statistically analyzed using One-way ANOVA followed by Tukey post hoc test was used to compare between more than two groups in non-related samples. An independent sample t-test was used to compare between two groups in non-related samples. A paired sample t-test was used to compare between two groups in related samples. Three-way ANOVA tests were used to test the interactions between different variables.
There was a strong significant positive relationship between apical microleakage and gap percentage. The apical microleakage and gap percentage were directly proportional with time.
Total fill BC sealer recorded the highest apical microleakage and gap percentage mean values at 30 days.
10% Citric acid recorded the highest apical microleakage and gap percentage mean values at two-time intervals (7&30 days).