Evaluation of the resistance to fracture of roots with cast metallic posts and fiber-glass posts at different working lengths, using the compression test / Avaliação da resistência à fratura de raízes portadoras de pinos metálicos fundidos e de fibra-de-vidro com diferentes comprimentos, por meio do teste de compressão

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

In this study, it was evaluated, in vitro, the resistance of fracture roots with glass-fiber and metallic intraradicular retainers with different lengths, using the compression test. Sixty caries-free superior canines had their crowns sectioned and radicular canals endodontically treated. The roots were embedded in acrylic resin, except for the 4 mm of cervical area. The prosthetic space was performed with cylindrical bur in low speed attached to a parallelometer, obtaining prepares with length of 6 mm (GI), 8 mm (GII) and 10 mm (GIII). Each group was divided into 2 subgroups according to the post material: glass-fiber posts and metallic cast posts, which were luted with Panavia F cement. Metallic cast crowns made done and cemented with zinc phosphate. The resin/dentin blocks were positioned in the Instron 4444 Universal Machine, using a rectangular tip with round edge, in an angle of 135o in relation to the root long axis and at a speed of 1 mm/min. The Dunn test showed no significant difference (p>0.05) among the metallic posts of different length (6 mm 0.91 kN, 8 mm 0.87 kN and 10 mm 0.74 kN). Besides in the glass-fiber post group, there werent significant difference among posts of 8 mm (0.58 kN) length, when compared to the 6 mm (0.43 kN) and 10 mm (1.00 kN). However, the post of 6 mm were statistically different (p<0.01) when compared with the 10 mm length. It was concluded that the post length influenced on the fracture resistance depending on the post type.

ASSUNTO(S)

odontologia dentistry title endodontia título odontologia endodontics pinos metálicos fundidos fratura cast metallic posts fracture pinos pré-fabricados fratura pre-fabricated posts fracture

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