Decoronation Technique
A mucoperiosteal flap is raised at the place of the ankylosed tooth, and the crown is removed with a diamond bur under continuous saline irrigation (Fig. 2A). The root filling is removed with an endodontic file, and the coronal part of the root surface is reduced to approximately 2 mm below the marginal bone. Here you can see the decoronation of ankylosed, infrapositioned incisor. (A) The crown is removed with a diamond bur under continuous saline irrigation. (B) The root filling has been removed with an endodontic file, and the coronal part of the root is reduced to a level of 1.5–2 mm below the marginal bone. (C) The empty root canal is thoroughly rinsed with saline and thereafter allowed to fill with blood. (D) The mucoperiosteal flap is drawn over the alveolus and sutured with single sutures.