title: Efficiency and effectiveness evaluation of three glass fiber post removal techniques using dental structure wear assessment method.
abstract: OBJECTIVE
  This study evaluated the efficiency and effectiveness of three glass fiber post removal techniques.
  
  
  METHODS
  Forty-five extracted maxillary teeth were endodontically treated and cross-sectioned in thirds. Presence of cementing agent and dental structure wear were assessed by analyzing images taken before luting of glass fiber post and after removal procedure. Teeth were divided into 3 groups: Group 1 - diamond bur + Largo reamer; Group 2 - ultrasonic insert; Group 3 - carbide bur + ultrasonic insert. Time spent on removal procedures, dental structure wear and amount of remaining cement agent were recorded and results submitted to ANOVA, Kruskal Wallis and Tukey-Kramer tests.
  
  
  RESULTS
  Group 1 - 16'46", 33.33% and 6.99%; Group 2 - 12'31", 40% and 7.86%; and Group 3 - 10'24", 80% and 8.14%. Group 3 presented the most effective removal of glass fiber posts.
  
  
  CONCLUSIONS
  There was no significant difference in efficiency among the evaluated techniques.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry São Leopoldo Mandic, SP, Brazil, .
authors.forename: Flávia Casale
authors.initials: FC
authors.lastname: Abe
authors.forename: Carlos Eduardo da Silveira
authors.initials: CE
authors.lastname: Bueno
authors.forename: Alexandre Sigrist
authors.initials: AS
authors.lastname: De Martin
authors.forename: Felipe
authors.initials: F
authors.lastname: Davini
authors.forename: Rodrigo Sanches
authors.initials: RS
authors.lastname: Cunha
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D017005:Dental Debonding / Q000295:instrumentation / Q000379:methods*; D017267:Dental Prosthesis Design; D003786:Dental Pulp Cavity / Q000473:pathology; D018130:Diamond / Q000737:chemistry; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D018915:Root Canal Preparation / Q000295:instrumentation; D013499:Surface Properties; D013997:Time Factors; D019553:Tooth, Nonvital / Q000473:pathology; D014464:Ultrasonic Therapy / Q000295:instrumentation; D000069453:Ultrasonic Waves
chemical_list: D019279:Resin Cements; C009753:fiberglass; D018130:Diamond