Comparative study of fracture resistence in function of post’s length and composition

Abstract

The objective of this study was to compare in vitro fracture resistance of roots restored with prefabricated metallic and aesthetics dental dowels in different lengths. Thirty human central incisors, which had their radicular lengths standardized in 14 mm, were used. Samples were divided in three groups of 10 roots each: Group I, prefabricated glass fiber dowels (Reforpost no. 2 – AngelusTM, Londrina, PR, Brasil) cemented in the limit of 2/3 of the radicular conduit; Group II, metallic dowels (Reforpost II - AngelusTM, Londrina, PR, Brasil) cemented in the limit of 2/3 of the radicular conduit and Group III, prefabricated glass fiber dowels (Reforpost no. 2 - AngelusTM, Londrina, PR, Brasil) cemented in the limit of 1/3 of the radicular conduit. Dental dowels in this study were cemented, by using the adhesive system Single BondTM (3M/ESPE, Sumaré, SP, Brasil) and the resinous cement RelyXTM ARC (3M/ESPE, Sumaré, SP, Brasil). After endodontic treatment, the roots were included in tubes of PVC with solemnity-activated acrylic resin, being the proof bodies submitted to compressive loads with angulation of 45° in relation to the long axis of the root and with displacement of 0.5 mm/min until there was fracture of the root and/or displacement of the dowel. The results were submitted to variance analysis with significance level of 5% and showed no statistically differences among the appraised groups.