Evaluation of the resistance to remove fiber-glass posts fixed to dentine with auto-adhesive resin cements / Avaliação da resistência à remoção de pinos de fibra de vidro fixados com cimentos resinosos auto-adesivos à dentina intra-radicular

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This study evaluated, by means of microtensile test, the bond strength of glass fiber posts luted with self-etch and self-adhesive resin cements to intraradicular dentine. Forty-eight single roots were endodontically treated and prepared to receive the glass fiber posts: Exacto/Angelus (EA) and Everstick/StichTeck (ES), which were cemented with self-adhesive cement: BisCem/Bisco (BIS) and RelyX Unicem/3M ESPE (UNI), and self-etch adhesive cements NAC100/Kuraray (NAC) and Panavia F/Kuraray (PAN). Specimens were thermocycled and stored in distilled water at 37C for 1 month. Forty eight roots (n=6) were sectioned in cervical region, obtaining 4 slices of 1.0-mm thick of each root that were subjected to tensile testing in a Special Test Machine. Two additional roots of each group were analyzed by SEM. ANOVA indicated significant differences among groups (p<0.001). Mean μTBS values obtained with ES post (28.570.46 MPa) were significantly higher than those obtained with EA (15.090.46 MPa). For Exacto post, the Tukey test indicated that the higher mean values were obtained with UNI (19.755.11 MPa) and BIS (16.364.82 MPa), which were statistically different (p<0.05) from NAC (13.965.05 MPa) and PAN (10.294.10 MPa). As regards to the Everstick post, the type of cement did not influence in the bond strength values (p>0.05). There was predominance of adhesive failure in dentine/cement interface of all groups. It may be concluded that Everstick post had the highest microtensile values, regardless of the cement used.

ASSUNTO(S)

pinos intrarradiculares endodontics odontologia odontologia endodontia cimentos resinosos dentistry resin cements intra-radicular posts

ACESSO AO ARTIGO

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