Influência do cimento endodôntico à base de óleo-resina de copaíba (Copaifera multijuga spp.) na resistência à união de pinos de fibra de vidro

Abstract

The problem involving eugenol based cements and its negative influence on the adhesion of intraradicular retainers cemented with resin cements is a reality in the dental field. The aim of this research is to verify the influence of the endodontic sealer based on copaiba oil-resin in the bond strength (BS) of glass-fiber posts cemented with conventional and self-etch resin luting cements by micropush-out test. (C), Endofill (E) and AHPlus (H). To perform this research, n=12 bovine incisors treated with endodontic cements -Copaíba (C), Endofill (E) and AHPlus (H)- were used. After root canal obturation, the three groups formed were randomly divided into two subgroups (n = 2) where each subgroup received a glass-fiber post cemented with a different luting cements: conventional luting cement (CR) and self-etch resing luting cement (RA), resulting in 6 experimental subgroups. After 24 hours of storage, the 12 bovine roots were sectioned transversely into 6 slices of 1mm thick for each region evaluated: cervical third (CT), middle third (MT) and apical third (AT). Each sample of the 6 subgroups was then submitted to the mechanical extrusion test by shear. The data obtained from the micropush-out test were analyzed using the statistical ANOVA 2 factor test. A significance level of 5% was considered. Results: In the middle and apical thirds only in the conventional resin cement group and Endofill sealer (ERC), it was observed a statistically significant difference in relation to the thirds of the other groups; resin based cement and copaiba-based cement groups showed a slight difference of the cervical third in relation to the middle and apical thirds; For the groups ERC and ERA, it was observed a significant difference between the three thirds where the cervical third showed the highest value of bond strength. Through this work results It was possible to conclude that copaiba oil-resin-based endodontic cement does not influence on the resistance of fiberglass posts union when these are cemented with conventional resin or self-etch luting cement.