Resistencia ao cisalhamento por extrusão - "push out" - de pinos de fibra de vidro a dentina intra-radicular

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

The purpose of this study was to evaluate the bond strength between fiber posts cemented in root dentin considering different depths of the roots (cervical, median and apical) and two luting materiais, through push out tests and to examine the integration among these components through scanning electron microscopy. Twenty sound bicuspids, tree trom cracks, extracted for orthodontic reasons, were selected. The crowns were removed at the cement enamel junction. The pulps were removed with endodontic reamers and the first 8,Omm of the canais were shaped with number 5 largo burs. The roots were divided into two groups of 10 each. The roots trom group 1 received fiber posts cemented with the self etching primer ED Primer and the composite resin Panavia F., while the roots of Group 2 received fiber posts cemented with the one bottle adhesive Single Bond and the composite resin Rely X. After the posts cementation, the roots were kept in humidity at 3-,0 C for 24 hours. The most apical part of the roots were sectioned until they were 8.0mm long. After that, the roots were sectioned transversally and three 2.7mm thick sections were obtained: cervical, median and apical. The push out test that evaluated bond strength between luting material and root dentin was carried out on an Instron (4411) testing machine. The specimens were positioned on a steel support platform with the post centered over a 2.0mm hole in the platform. A steel probe 1.0mm in diameter was centered over the post and used to apply force to the test specimens. Data from the push out test revealed no statistically significant differences at the cervical portion of the root between the two cementation systems tested. At the median and apical portion of the root, the bond strength values presented by the Sing/e Bond and Re/y X were superior and statistically different from those presented by ED Primer and Panavia F (P

ASSUNTO(S)

fiber post resin cement bond strength push out dentistica adhesive system

ACESSO AO ARTIGO

Documentos Relacionados