Effects of post system and length on the strain and fracture resistance of root filled bovine teeth

International Endodontic Journal
P C F Santos-FilhoCarlos José Soares

Abstract

To investigate ex vivo the effects of different post systems and lengths on the strain and fracture resistance of root-filled teeth. One hundred and thirty-five bovine incisors were sectioned 15 mm from their apices, root-filled and divided into three groups (n = 45): fibreglass post; prefabricated steel post; cast post and core. Each group was divided into three subgroups (n = 15) according to the post length: 5.0 mm; 7.5 mm; 10.0 mm. All teeth were restored with metal crowns. For strain-gauge measurement, two strain gauges per sample were used. The fracture resistance (N) was measured and the data were analysed with two-way analyses of variance, followed by the Tukey's HSD test (alpha = 05). For all posts, decreased lengths resulted in increased microstrain values. However, the fibreglass posts were associated with lower increases when compared with cast post and cores and prefabricated steel posts, which showed microstrain values two times higher when the post length was 5.0 mm. The two-way analyses of fracture resistance values revealed that post length was statistically significant for the metal posts and not significant for the fibreglass post. The fracture mode analysis indicated that all groups tended to demonstrate roo...Continue Reading

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Citations

Feb 18, 2014·Journal of Dentistry·Rafael Sarkis-OnofreTatiana Pereira-Cenci
Dec 19, 2009·Dental Materials Journal·Carla Santina de Miranda CoelhoCarlos José Soares
Sep 18, 2014·Journal of Endodontics·Paulo César Freitas Santos-FilhoLuis Roberto Marcondes Martins
Dec 18, 2013·Journal of Endodontics·Paulo César Freitas Santos-FilhoLuis Roberto Marcondes Martins
Nov 10, 2013·The Journal of Prosthetic Dentistry·Crisnicaw VeríssimoPaulo César Freitas Santos-Filho
Sep 5, 2012·The Journal of Prosthetic Dentistry·Andréa Dolores Correia Miranda ValdiviaCarlos José Soares
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