Influence of three adhesives systems on the extrusion strength of glass fiber posts fixed by resin cements / Influência de três sistemas adesivos na resistência à extrusão de pinos de fibras de vidro fixados com um cimento resinoso

AUTOR(ES)

Juliana Cefaly Raineri

DATA DE PUBLICAÇÃO

2006

RESUMO

In order to increase strength to fracture of endodontically treated teeth, a number of restorative techniques were developed. Nowadays, carbon and glass fiber post systems are the most used due to their advantages of modulus of lasticity similar to dentin, which lead to lower stress and consequently lower number of root fractures, besides no laboratorial work is needed. The choice of the best cement for luting these posts is an important step and the development of resin cements and adhesive systems that can be use with posts are a great evolution due to the possibility of micromechanical retention in roots. Therefore, the aim of this study was to evaluate extrusion strength of glass fiber posts cemented with resin luting cement Rely X ARC using three different adhesive systems: Scothbond, Single bond and Adper Prompt L Pop. After luting, samples were seccionated in two regions, apical and cervical, each one representing one sample. A stainless steel device was used to perform extrusion test, stabilizing samples. This device had a central orifice that allowed movement of post or cement, during extrusion test. For extrusion test, sample was adapted in the device with cervical face directed to down and a plane surface active point (1 mm diameter) was adapted to the universal test machine which exerted an extrusion force in the center of post. Test was performed with 0.05 mm per minute and the maximum load at failure was registered in kgf. Regarding resin luting cement Rely X ARC combining with adhesive systems, the best results at cervical were obtained with Rely X and Scotchbond adhesive, followed by Adper Prompt and Single bond systems. At apical region Scotchbond was better than Adper Prompt and Single bond, but there was no statistically significant difference between Adper Prompt and Single bond.

ASSUNTO(S)

cimento resinoso glass fiber post resin cements restauração dentária pinos dentários adesivos dentinários adhesives

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