INFLUÊNCIA DA TRANSLUCIDEZ DE PINOS DE FIBRA DE VIDRO E TEMPO DE FOTOATIVAÇÃO DE UM CIMENTO DUAL NA RESISTÊNCIA DE UNIÃO À DENTINA RADICULAR

Abstract

The aim of this study was to evaluate in vitro through the push-out test, if the use of opaque glass fiber posts (Exacto – Angelus [PO]) and translucent (Exacto Translucent – Angelus [PT]), adhesively cemented into the root with dual resin cement (Variolink II - Ivoclar Vivadent) under different polymerization time had an influence on the bond strength in three different root canal thirds. Forty-eight singlerooted extracted human premolars were selected from the Tooth Bank UEPG for research. They had their crowns sectioned to form roots with 15 mm in length. All teeth received endodontic treatment and then were divided into 6 groups (n=8), to receive the cementation according to the type of glass fiber post (opaque vs.translucent) and the time of photoactivation of resin cement (20, 40 and 60 seconds). After storage in water at 37° C for one week, the teeth were embedded in acrylic resin and sectioned perpendicular to its long axis to form discs 1 mm thick, with two discs for each root third, and then were taken to the machine universal testing. The push-out test was performed at a speed of 0.5 mm/min. The data were statistically analyzed by ANOVA and Tukey's test (p = 0.05). The mean values of bond strength (MPa) and standard deviation (SD) for groups in the cervical third, middle and apical regions were: PO20 - 21.02 ± 3.52, 15.83 ± 4.94 and 5.20 ± 10:48; PO40 - 14.42 ± 3.98, 12.12 ± 4.40 and 11.59 ± 4.89; PO60 - 16.27 ± 7.14, 13.33 ± 5.22 and 16.99 ± 7.82; PT20 - 18.34 ± 5.47, 10.83 ± 4.63 and 9.98 ± 4.76; PT40 - 17.51 ± 6.55, 14.06 ± 3.85 and 10.95 ± 4.65; PT60 - 19.42 ± 5.86, 15.35 ± 5.43 and 12.77 ± 5.93). There were no significant differences between the types of fiber posts used and the different times of polymerization (p>0.05) in relation to the root area were statistically significant differences only between the cervical and the other thirds (p>0.05). It can be concluded that the bond strength of the root canals was not affected by the type of glass fiber post (opaque vs. translucent) and photoactivation time.