Avaliação da resistência à fratura de raízes portadoras de pinos metálicos fundidos e de fibra de vidro cilíndricos e cônicos / Evaluation of the resistance to fracture of roots with cast metallic posts and cylindrical and conical fiber-glass posts

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

This study evaluated in vitro the fracture resistance of roots with metallic and glass-fiber intraradicular retainers, varying the geometric configuration and using the compression test. The sample had 50 central superior incisives: 10 received only the coronary preparation (control) and 40 had their crowns sectioned and radicular canals endodontically treated (experimental group). 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. Groups were then randomly divided: teeth only coronary prepared (I), metallic cast posts with cylindrical (II) and conical (III) shape, glass-fiber posts with cylindrical (IV) and conical (V) shape, which were luted with Panavia F. 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. Means in KN were: I (0.870.23), II (0.440.24), III (0.57 0.19), IV (0.710.35), V (0.450.11). The Tukey test showed no significant difference (p>0.05) between the cylindrical and conical metallic posts. The cylindrical glass-fiber posts were statistically similar (p>0.05) to the control group, which presented the higher fracture resistance values. It was concluded that the geometric configuration influenced on the fracture resistance of glass-fiber posts.

ASSUNTO(S)

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

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