Descoloração dentária associada a três cimentos obturadores endodônticos e a influência da agitação ultrassônica.

Abstract

The objective of this study was to evaluate the color change (ΔE) provided by Endofill (EF), Sealer 26 (S26) and MTA Fillapex (MTAF) endodontic sealers; also, to evaluate the influence of the use of ultrasonic agitation (UAS) in this darkening. Sixty blocks of dentin of bovine teeth were prepared and had circular cavities performed on their palatine faces in order to maintain a remnant of 2.0 mm thickness. After the preparation, they were divided into 6 groups according to the cements / treatment (n = 10). When used, UAS was performed with a smooth ultrasonic insert coupled to a piezoelectric apparatus. The color was measured by means of a Vita Easyshade spectrophotometer after the insertion of the cements and restoration of the cavities at the times: after the restoration (T0); 7 days (T1); 30 days (T2); 60 days (T3); 90 days (T4) and after 180 days (T5). During the period the specimens were immersed in containers containing 2 mL of saline solution, which were kept in an oven at 37ºC. Statistical analysis was performed by the Kruskal-Wallis and Dunn tests, both with significance set at 5%. It was observed at 7 and 30 days that only the EF group without UAS presented ΔE> 3.7, a reference for clinically perceptible alterations, presenting a significant difference at 7 days (P <0.05). Significant differences were observed throughout the experimental period in all other groups (P <0.05), and perceptible dentin discoloration was observed independent of UAS. In the light of the foregoing, it can be concluded that, although initially only the EF showed a noticeable color variation, at the end of the experimental period all materials under test produced darkening. Furthermore, UAS did not significantly interfere with the ΔE effects of the cements analyzed.