title: Influence of ferrule preparation with or without glass fiber post on fracture resistance of endodontically treated teeth.
abstract: OBJECTIVE
  This study evaluated the effect of ferrule preparation (Fp) on the fracture resistance of endodontically treated teeth, restored with composite resin cores with or without glass fiber posts.
  
  
  METHODS
  Forty-four bovine teeth were sectioned 19 or 17 mm (2 mm ferrule) from the apex, endodontically treated and assigned to four groups (n = 11): Group 1: Fp and post; Group 2: Fp and without post; Group 3: without Fp and with post; Group 4: without Fp and without post. All specimens were restored with composite resin core and metal crown. Specimens were subjected to fracture resistance testing in a universal testing machine at a crosshead speed of 0.5 mm/min. The data were analyzed by two-way ANOVA and Tukey's tests (α=0.05).
  
  
  RESULTS
  The mean fracture resistance values were as follows: Group 1: 573.3 N; Group 2: 552.5 N; Group 3: 275.3 N; Group 4: 258.6 N. Significantly higher fracture resistance was found for the groups with Fp (p<0.001).
  
  
  CONCLUSIONS
  There was no statistically significant interaction between the "Fp" and "post" factors (p = 0.954). The ferrule preparation increased the fracture resistance of endodontically treated teeth. However, the use of glass fiber post showed no significant influence on the fracture resistance.
authors.affiliation: Department of Restorative Dentistry, Dental School, University of Passo Fundo, Passo Fundo, RS, Brazil.
authors.forename: Alexandra Furtado de
authors.initials: AF
authors.lastname: Lima
authors.forename: Aloísio Oro
authors.initials: AO
authors.lastname: Spazzin
authors.forename: Daniel
authors.initials: D
authors.lastname: Galafassi
authors.forename: Lourenço
authors.initials: L
authors.lastname: Correr-Sobrinho
authors.forename: Bruno
authors.initials: B
authors.lastname: Carlini-Júnior
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry; D003442:Crowns; D003722:Dental Alloys / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000295:instrumentation; D005898:Glass / Q000737:chemistry*; D006171:Gutta-Percha / Q000627:therapeutic use; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D012387:Root Canal Filling Materials / Q000627:therapeutic use; D012389:Root Canal Obturation; D018915:Root Canal Preparation / Q000379:methods; D013314:Stress, Mechanical; D014082:Tooth Fractures / Q000503:physiopathology*; D019231:Tooth Preparation, Prosthodontic / Q000379:methods*; D019553:Tooth, Nonvital / Q000503:physiopathology*
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D003764:Dental Materials; D012387:Root Canal Filling Materials; C009753:fiberglass; C074417:Endo-Fill; D006171:Gutta-Percha