Influence of smear layer removal and application mode of MTA on the marginal adaptation in immature teeth: a SEM analysis.

Objectives: This study was an ex vivo evaluation of the marginal adaptation of mineral trioxide aggregate as an apical barrier using teeth with an open apex and scanning electron microscopy.

Materials And Methods: Eighteen single-rooted human teeth were used. An artificial open apex was created using Gates Glidden drills #6-1 in a crown-down manner until the #1 bur passed through the foramen.