Efetividade de diferentes protocolos de cimentação na resistência da união de pinos de fibra de vidro no canal radicular

Abstract

Study hypothesis: The hypothesis in the present study was that the different protocols cementation of glass fiberglass would not affect the values of bond strength to root dentin at the different depths of the root canal. Aim: In this ex vivo study was evaluated the bond strength of resin cement fixed by fiber posts in the cervical, medium and apical roots thirds. Method: Fifty bovine incisors roots in length 18mm were prepared to lute fiber posts with different protocols of cementation. The luting agents tested: ED Primer/Panavia F (Kuraray), Scotchbond Multipurpose Plus (3M ESPE)/RelyX ARC (3M ESPE), Single Bond Universal - SBU(3M ESPE)/RelyX Ultimate - ULT (3M ESPE), Scotchbond Multipurpose Plus - SBMP (3M ESPE)/RelyX Ultimate (3M ESPE), RelyX U200 (3M ESPE). The roots were sectioned to obtain 1mm thick slices of the cervical, middle and apical thirds of each root. The bond strength was evaluated with a push-out test (universal testing machine EZ-S, Shimadzu). Data were statistically analyzed by ANOVA and Tukey’s test with a significance level of 5%. Results: The results showed that SBU/ULT and SBMP/ULT cementation systems had the highest bond strength values compared to the other experimental groups, with no significant difference between them. Lower values of bond strength were observed for the other groups, also with no difference between them. The cervical third showed the highest bond strength compared to the middle and apical thirds, which did not present significant difference between them. Conclusion: the SBU/ULT system produces superior adhesive resistance to the other systems tested, except SBMP/ULT, with the advantage of reduced clinical steps and consequently lower sensitivity of the adhesive technique.