Submergence of roots for alveolar bone preservation. II. Reimplanted endodontically treated roots.

Root canal therapy was accomplished on the mandibular premolars of four dogs. These premolars were then extracted, contoured, reimplanted, and submerged. Resorption occurred up to 60 days; healing progressed satisfactorily, with some evidence of coronal osseous regeneration. Root canal sealer was expressed out the coronal orifice after the roots were submerged. This sealer appeared to affect normal healing over the coronal surface of the roots.