Resistência à tração diametral de uma resina composta associada a pinos intra-radiculares pré-fabricados. / Diametral tensile strength of a resin composite core bonded to prefabricated posts.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

The purpose of this study was to determine the influence of different types of posts on the fracture strength of a resin composite core material using the diametral tensile strength test. Seven groups of specimens were prepared each with 10 cylindrical specimens made of one composite material (Tetric Ceram, IvoclarVivadent) as follows: Group 1- Control group of composite only specimens; Group 2-Composite and VectrisPost (IvoclarVivadent); Group 3- Composite and Fiber-Post (Jeneric/Pentron); Group 4- Composite and Æstheti-Plus post (Bisco); Group 5- Composite and Light-Post (Bisco); Group 6- Composite and Dentorama post (Svenska) and group 7- Composite and ParaPost (Coltene/Whaledent). Following storage specimens were subjected to compressive loading in an Instron testing machine (model 8501) until failure occurred. Means and standard deviations of diametral tensile strengths in MPa were: Group 1- 49,64 (3,36); Group 2- 29,77 (3,36); Group 3- 31,9 (2,39); Group 4- 28,92 (2,20); Group 5- 34,26 (3,37); Group 6- 33,45 (2,46) and Group 7- 27,90 (2,40). Statistical analysis revealed significant differences in mean diametral tensile strengths among the groups. It is concluded that the use of posts did not reinforce the composite resin cores. Among the post/core groups Light-Post, Dentorama post and Fiber-Post resulted in the highest values of tensile strength while ParaPost resulted in the lowest value of tensile strength.

ASSUNTO(S)

resinas compostas (resistência) resistências a tração pinos dentários

ACESSO AO ARTIGO

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