title: Adhesive restoration of anterior endodontically treated teeth: influence of post length on fracture strength.
abstract: OBJECTIVE
  This study aims to evaluate the fracture resistance of endodontically treated anterior teeth restored with crowns made of composite or ceramic and retained without the use of a post (endocrowns) or with posts of 5 mm (short) and 10 mm in length (long).
  
  
  METHODS
  Forty-eight intact maxillary incisors were selected for the study. After endodontic treatment, the crowns were sectioned 2 mm coronally to the cementoenamel junction provided with a ferrule of 2 mm. The roots were randomly divided into six groups (n = 8) according to the post length and type of coronary restoration. The crowns were fabricated with the chairside economical restoration of esthetic ceramics system. Group 1 was restored with a 10-mm glass fiber post, composite core, and a full-coverage ceramic crown (LPCer); group 2, with a 5-mm glass fiber post, composite core, and a full-coverage ceramic crown (SPCer); group 3, with a 10-mm glass fiber post, composite core, and a full-coverage composite crown (LPCpr); group 4, with a 5-mm glass fiber post, composite core, and a full-coverage composite crown (SPCpr); and groups 5 (EndoCer) and 6 (EndoCpr) were restored with ceramic and composite endocrowns, respectively. The teeth were then thermomechanically loaded in a chewing machine. After fatigue, the specimens were loaded to fracture. Data were analyzed with ANOVA and chi-square test. Mode of failure was defined as repairable or non-repairable.
  
  
  RESULTS
  Presence of post, post length, and crown material had no significant effect on the fracture resistance. Groups restored with endocrowns presented a higher number of repairable fractures in respect to the other groups.
  
  
  CONCLUSIONS
  Presence of a post had no effect on the restorations' fracture strength.
  
  
  CONCLUSIONS
  Although this in vitro study has some limitations in respect to its clinical relevance, the restoration of largely destroyed anterior teeth with the use of an endocrown or a short glass fiber post might have advantages over a large glass fiber post.
authors.affiliation: Department of Endodontic and Restorative Dentistry, School of Dentistry, Universitat Internacional de Catalunya, Sant Cugat del Vallès, Barcelona, Spain, annaisramses@csc.uic.es.
authors.forename: Anaïs
authors.initials: A
authors.lastname: Ramírez-Sebastià
authors.forename: Tissiana
authors.initials: T
authors.lastname: Bortolotto
authors.forename: Maria
authors.initials: M
authors.lastname: Cattani-Lorente
authors.forename: Lluis
authors.initials: L
authors.lastname: Giner
authors.forename: Miguel
authors.initials: M
authors.lastname: Roig
authors.forename: Ivo
authors.initials: I
authors.lastname: Krejci
mesh_terms: D003738:Dental Cements; D003793:Dental Restoration, Permanent; D004708:Endodontics; D006801:Humans; D011176:Post and Core Technique; D014082:Tooth Fractures
chemical_list: D003738:Dental Cements