title: Fracture resistance of weakened teeth restored using accessory glass fiber posts.
abstract: This study used differential root weakening to evaluate the fracture resistance of bovine teeth restored using glass fiber posts (with or without accessory glass fiber posts). Fifty bovine mandibular incisors were sectioned 14 mm from the apex, fixed in acrylic resin blocks, and divided into 5 groups: healthy roots with a glass fiber post (Group 1), partially weakened teeth with a glass fiber post (Group 2), partially weakened teeth with a glass fiber post and 2 accessory glass fiber posts (Group 3), extensively weakened teeth with a glass fiber post (Group 4), and extensively weakened teeth with a glass fiber post and 5 accessory glass fiber posts (Group 5). Posts were luted with resin cement, cores were prepared using composite resin, and metallic crowns were cemented. The specimens were stored in distilled water at 37°C for more than 72 hours until the fracture resistance test. Specimens were loaded at 135 degrees relative to the long axis of the tooth at a crosshead speed of 0.5 mm/minute in a universal testing machine. All groups predominantly exhibited favorable failure patterns and there were no statistically significant differences between groups (two-way ANOVA, α = 0.05).
authors: School of Dentistry, Rio Grande do Sul Federal University, Porto Alegre, Brazil.
authors: Ricardo Abreu
authors: RA
authors: da Rosa
authors: Mirela Sangoi
authors: MS
authors: Barreto
authors: Tiago Abreu
authors: TA
authors: da Rosa
authors: Katia Rodrigues
authors: KR
authors: Reis
authors: Osvaldo Bazzan
authors: OB
authors: Kaizer
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003764:Dental Materials; D003799:Dental Stress Analysis; D005898:Glass; D011176:Post and Core Technique; D019279:Resin Cements; D014082:Tooth Fractures; D014092:Tooth Root
chemical_list: D003764:Dental Materials; D019279:Resin Cements; C009753:fiberglass
keywords: fiber post; fracture resistance; weakened teeth