QUESADA, Gustavo Adolfo Terra    RIGODANZO, Luciana. Materials used in retrograde obturations : comparison between light-cured glass ionomer and Portland cement. Rev. cir. traumatol. buco-maxilo-fac. []. 2016, 16, 3, pp. 13-19. ISSN 1808-5210.

The objective of this study was to compare through an in vitro test, if infiltration occurs or not by 0.2% methylene blue dye in retrograde obturations sealed with glass ionomer light-curing cement and Portland cement. Forty single-rooted teeth recieved conventional endodontic treatment. The crowns were removed with a cut at the cementoenamel junction perpendicular to the long axis of the tooth and a horizontal cut 2 to 3 mm from the apex. The roots were externally coated with two layers of nail polish. An apical cavity was performed for retrofilling of the conduits. The sample was divided into 2 groups: Group 1 with apical insulated glass ionomer light-curing cement and Group 2 with insulation with Portland cement. After the completion of the retrograde filling, the samples were subjected to partial immersion of 0.2% methylene blue dye in neutral pH for 24 hours. The samples were washed in running water for 12 hours and then 10 days of drying. After the roots were split lengthwise mesiodistally and observed by two independent examiners with the aid of a magnifying glass with an increase of twice. The chi-square statistical test was used to verify the hypotheses. Of the total of 20 teeth with retrograde obturations using ionomer, only one tooth was infiltrated, since with respect to Portland cement in 18 teeth there was infiltration with 0.2% methylene blue. In this in vitro test, the results suggest that the apical seal with glass ionomer is better than the sealing with Portland cement.

: Retrograde Obturation; Glass Ionomer Cements; Portland cement; Dental Leakage..