Few animal studies have compared the efficacy of coronal plug in preventing periapical inflammation. Animal studies in dog have reported minimal or no periapical inflammation in teeth with MTA intraorifice barrier than the ones without intraorifice barrier. Stassen et al in an retrospective study evaluated the effect of intraorifice barrier in relation to marginal bone level and found more cases of apical periodontitis in tooth where root filling extended coronal to marginal bone level called positive than the ones where the root filling ended apical to marginal bone level called negative on the healing of apical periodontitis. While depth of intraorifice barrier has been investigated earlier. Level of intraorifice barrier and its effect on propagation of marginal periodontitis and healing of apical periodontitis remain unexplored.