title: Fatigue resistance of teeth restored with fiber posts and different post cementation strengths.
abstract: This study sought to evaluate how different post cementation strategies affected the fatigue resistance of bovine teeth restored with glass fiber posts. The canals of 63 single-rooted bovine teeth (each 16 mm in length) were prepared to 9 mm using a preparation drill from a double-tapered fiber post system. Each specimen was embedded in a PVC cylinder using acrylic resin up to 3 mm of the most coronal portion of the specimen and was allocated into one of seven groups (n = 9) based on the strategies for cementation. After cementation, a standard core build-up was made with composite resin. The specimens were stored for seven days and submitted to mechanical cycling (50 N, 8 Hz, 37 degrees C). After fatigue testing, a score was given to each specimen, based on the number of fatigue cycles required to fracture the specimens; the scores were submitted to statistic analysis (Kruskal-Wallis, alpha = 0.05). The strategy for post cementation did not affect the resistance to fatigue (P = 0.8669). Based on the results, the resistance to fatigue does not appear to depend on the post cementation strategy.
authors.affiliation: Division of Prosthodontics, Department of Restorative Dentistry, School of Dentistry, Federal University of Santa Maria, Brazil.
authors.forename: Luiz Felipe
authors.initials: LF
authors.lastname: Valandro
authors.forename: Lucas Wadas
authors.initials: LW
authors.lastname: Zardin
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: de Villa
authors.forename: Marina
authors.initials: M
authors.lastname: Amaral
authors.forename: Graziela
authors.initials: G
authors.lastname: Galhano
authors.forename: Paolo
authors.initials: P
authors.lastname: Baldissara
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Bottino
mesh_terms: D000818:Animals; D002417:Cattle; D002484:Cementation / Q000379:methods*; D003188:Composite Resins; D003799:Dental Stress Analysis; D005898:Glass; D005899:Glass Ionomer Cements; D011176:Post and Core Technique; D019279:Resin Cements / Q000737:chemistry; D019553:Tooth, Nonvital / Q000503:physiopathology*
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; D019279:Resin Cements; C009753:fiberglass