Influencia do sistema adesivo na microdureza do cimento resinoso dual na cimentação de pinos pre-fabricados de fibra de vidro em diferentes profundidades / Influence of adhesive system on hardening of dual-cured resin cement at different depths in restorations with fiber posts

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The purpose of this study was to evaluate the Knoop hardness (KHN) of dual cure resin cements used to bond fiber posts at different regions of root canal dentin. Forty eight extracted roots of bovine teeth were used. After root canal treatment they were randomly divided into six groups of 8 roots each. Fiber posts were inserted with two different adhesive systems and dual cure luting resin cements. Group 1: Single Bond (3M ESPE)/RelyX ARC/(3M ESPE), group 2: ED Primer (Kuraray)/Panavia F (Kuraray), group 3: Single Bond (3M ESPE)/Panavia F (Kuraray), group 4: ED Primer (Kuraray) RelyX ARC/(3M ESPE), group 5: no adhesive system/RelyX ARC/(3M ESPE) and group 6: no adhesive system/Panavia F (Kuraray). The fixed and bonded specimens were stored for 48 hours, sectioned longitudinally and Knoop hardness measured at coronal, medium and apical regions. Four root halves of each group was then processed for evaluation by SEM of resin tags formation in dentin. The highest KHN were obtained with group 6 that it didn t use adhesive system none, not presenting any significant difference among the medium and apical depth. The group 4 had the lowest KHN compared to the other groups. Conditioning of the root canal dentine with phosphoric acid and use one-bottle bonding systems gave a more uniform penetration of resin tags than observed after the use of ?self-etching? adhesives. Dual cure resin cements used with different adhesive systems and the depth, influenced in the Knoop hardness, which was significantly reduced in the apical region. Panavia F resin cement showed the highest KHN means in all of the tested depths

ASSUNTO(S)

root canal therapy canal radicular - tratamento dental pulp cavity cavidade da polpa dentaria

ACESSO AO ARTIGO

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