title: The use of an existing cast post and core as an anchor for extrusive movement.
abstract: OBJECTIVE
  This article describes an original solution for a tooth with an existing cast post and core placed subgingivally.
  
  
  METHODS
  The tooth was erupted rapidly using a simplified and easy technique that incorporates fiberotomy during the process of movement.
  
  
  RESULTS
  The distal finish line of the core, which was subgingival before movement onset, was elevated, allowing the placement of crown margins on sound tooth structure. Clinical evaluation of the tooth after a period of 4 weeks, during which a provisional acrylic resin crown was used for retention, showed no need for corrective surgery, and fabrication of a metal-ceramic crown (Captek) was begun.
  
  
  CONCLUSIONS
  When failing to place crown margins on sound tooth structure, the existence of a cast post and core in such a nonrestorable tooth may serve as an anchor in the process of rapid extrusion. Following the need to respect the biologic width and fulfill the obligatory ferrule effect circumferentially, this extrusive treatment modality was applied to meet high treatment standards.
authors.affiliation: Department of Prosthodontics, School of Dental Medicine, The Hebrew University-Hadassah, Jerusalem, Israel. smidta@md2.huji.ac.il
authors.forename: Ami
authors.initials: A
authors.lastname: Smidt
authors.forename: Eyal
authors.initials: E
authors.lastname: Venezia
mesh_terms: D000328:Adult; D016556:Crown Lengthening / Q000379:methods*; D005260:Female; D006801:Humans; D011176:Post and Core Technique; D014078:Tooth Eruption; D014087:Tooth Movement Techniques / Q000379:methods*; D019553:Tooth, Nonvital